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Instruments
Oscilloscope
HM 305
EN
GL
ISH
4
S-0
30
5-0
0E
0
01
SE
P 1
99
6
SERVICE-MANUAL HM305
Änderungen vorbehalten / Subject to change without notice 1
Y- Input, Attenuator, Preamplifier CH1 ................................ 2Y- Input, Attenuator, Preamplifier CHII ................................ 3Y- Intermediate Amplifier CHI + CHII,Channel Switch + Chopper Generator, ............................... 4Analog/ digital Switch, TRIG. andX- Signal Amplifier ............................................................... 4Trigger Amplifier, Trigger Coupling,TV Sync. Separator, ............................................................. 5Peak Value Detection, Trigger Comparator ......................... 5Timebase Sweep & Hold off Generator .............................. 6Component Tester, Calibrator ............................................. 7Timebase, Trigger Logic ...................................................... 8XY- Amplifier, YF- Amplifier, Overscan Circuit ..................... 9Front/ Controlboard ........................................................... 10CRT- Circuit, Unblanking, CRT- Board ................................ 11Power Supply .................................................................... 12Driver Stage (A/D) ............................................................. 13A/D Converter, Address Counter, RAM'S,Timebase (Digital), Control Logic ...................................... 14Display- Control, Address Counter, RAM,Control Logic, HAMEG Bus Driver .................................... 15Y D/A Converter, Dot Join,Y- Analog Output Driver .................................................... 16+5V Analog Power Supply, IC Power Supply ................... 17YPA Board (Topside) .......................................................... 18YPA Board (Bottomside) ................................................... 19Power Supply Board (Topside) .......................................... 20Adjustment Plan : Power Supply Board ............................ 21Digital Board (Topside) ...................................................... 22Adjustment Plan: Digital Board ......................................... 23Front Controlboard (Topside, Bottomside) ........................ 24CRT Board (Topside, Bottomside) ..................................... 25XY Board (Topside) ............................................................ 26XY Board (Bottomside) ..................................................... 27TB Board (Topside) ............................................................ 28TB Board (Bottomside) ...................................................... 29CCT Board (Topside, Bottomside) ..................................... 30
Adjustment Procedure ................................................... 31St.
0996
-Hüb
/Brü
/Sch
m
HM305
Service ManualCircuit DiagramsAdjustment Procedure
Änderungen vorbehalten / Subject to change without notice2
ABCD
87
65
43
21
D C B A
12
34
56
78
Do
cum
en
t N
um
be
r :
Da
te :
Tit
le :
Rev
.:R
Ae
nd
eru
ng
en
vo
rbe
ha
lte
n!
/ S
ub
ject
to
ch
an
ge
wit
ho
ut
no
tice
!
5 m
V1
0 m
V2
0 m
V5
0 m
V1
00
mV
20
0 m
V5
00
mV
1
V2
V
5
V1
0
V
1.4V
2.8
V
2.8
V
50
mV
/DIV
50
mV
/DIV
12
34
**
**
**
**
* * *
* * * * * ** * *
4K
75
be
i O
PA
60
2A
P
-7.4
V
20
V
R11
03
3R
2
C11
23
p3
50
0V
R11
811
1K
R11
39
88
K
C10
76
80
pR
114
10K1
R12
910
0K
D10
1B
AS
34
2
3 1
T10
6M
MB
T918
wse
lS
OT
-23
C13
20.
1u+
C13
410
0u 1
6V
- + 74
1
632
5
IC10
1A
D4
28
30 R
122
47
K
C12
31n
R12
110
0KR
123
12K1
R12
810
K0
+
C12
41
0u
35
V
R15
11K
21
C13
50.
1u
R15
06K
19
R15
26K
81
C13
60.
1u
R15
610
K0
R12
44
75
R
+C
154
10
u 3
5V
R20
11K
00
4
53
IC10
3BH
M25
13
12 14
IC10
3EH
M25
7
86
IC10
3CH
M25
10
9 11
IC10
3DH
M25
R16
95
K6
2
R17
11K
00
R17
04
K3
2
C14
70.
1u
+
C14
810
0u 1
6V
C10
10
.1u
40
0V
2
15 1
16
IC10
3AH
M25
R14
13
9K
2C
130
150p
R13
95
0R
1
2
3
T113
BC
850
SO
T-2
3c
R2
00
1K00
+C
152
10
u 3
5V
C11
08
p2
20
0V
9
87 R
E101
BA
LD12
W
23
4
RE1
01A
ALD
12W
78
9
RE
102B
ALD
12W
43
2
RE
102A
ALD
12W
1
2
3
T114
BC
860
SO
T-2
3c
R17
210
R0
135
7 8
642
S10
2S
W8
246
78
531
S101
SW
8
R111
33
2R
R11
55R
1R
119
56
R2
C13
11
0n
40
0V
R11
65
6R
2
C10
815
p
R12
61M
00
R13
01K
00
C13
30.
1u
R13
751
R1
R18
068
1R
R18
468
1R
R18
17
5R
0
R18
37
5R
0
R19
71K
10
R18
71K
10
R19
93
3R
2C
144
0.1u
+
C14
51
0u
35
V
8-
73
-4
+
106
RE1
01D
ALD
12W
8-9
3-
2
+ 15
RE1
01C
ALD
12W
8-9
3-
2
+ 15
RE
102C
ALD
12W
8-
73
-4
+ 106
RE
102D
ALD
12W
1
2
3
T10
2B
C86
0S
OT
-23c
R10
84
3K
2
1
2
3
T10
3B
C86
0S
OT
-23c
R10
94
3K
2R
164
1M50
R16
31M
50
R16
21M
50
R13
81K
50
1
2
3
T10
7M
MB
T36
40
SO
T-2
3w
sel
R15
815
0R
R15
97
5R
0
R16
07
5R
0
R16
718
R2
R14
83
K9
2
R17
910
0R
R18
610
0R
R17
86K
81 R18
56K
81
R17
368
1RR17
490
9R
R13
65
62
R
R14
72
K4
3
R14
02
74
R
R17
511
0R
C10
93
p3
50
0V
R18
24
70
R
C15
00.
1u
R2
02
2K21
R19
64
R7
0
R19
41K
10
R18
84
R7
0
R19
01K
10
R19
813
0R
R19
210
R0
R12
051
R1
R16
87
5R
0
C11
42
2p
R14
212
1KC
129
33
0p
C15
10.
1u
+
C15
510
0u 1
6V
+
C15
310
0u 1
6V
1
2
3T
108
BC
850
SO
T-2
3c
C11
70.
1uC
118
0.1u
2
31T1
12M
MB
T918
SO
T-2
3w
sel
2
3 1
T111
MM
BT9
18S
OT
-23
wse
l
C14
6
C11
50.
1uC
116
0.1u
2
3 1
T10
9M
MB
T918
SO
T-2
3w
sel R
157
1K50
R14
94
32
R
R15
351
R1
C13
80.
1u
R15
51K
24
C13
96
p8
1
2
3T1
01B
C85
0S
OT
-23c
R10
61K
00
R10
312
K1R
104
12K1
R10
23
K6
5
C12
10.
1u
C11
90.
1u
R10
122
R1
+C
120
100u
16V
+
C14
91
0u
35
V
C10
23
-10
pC
113
3-1
0p
C10
53
-10
p
R12
71M
00
C10
36
p8
20
0V
R19
590
9R
R18
990
9R
R17
64
75
K
R17
74
7K
R19
31K
10
R19
11K
10
C14
10.
1u
C14
20.
1u
C14
30.
1u
C12
60.
1u
+
C13
71
0u
35
V
C14
0R16
1
C10
48
p2
20
0V
C10
61
2p
20
0V
C111
3-1
0p
C15
60.
1u C4
56
0.1u
R13
33
K3
2
R13
41K
1
2
3
T116
MM
BT
3640
SO
T-2
3w
sel
R13
25
K6
2
C12
70.
1u
+ C12
810
0u 1
6V
3 21
T10
4J3
10T
O-9
2
135
7 8
642
S10
4S
W8
321 4
2 4 5 1 3
S10
3S
YH
A1
R2
03
47
0R
R2
04
6K81
R2
05
51R
1
1
P10
0
R11
78
98
K
3
2
1
T117
J310
TO
-92
3
2
1
T118
J310
TO
-92
3
2
1
T119
J310
TO
-92
R16
54
75
K
R16
64
75
K
R20
622
K1
12
D10
3B
ZV
55C
6V2
SO
T-8
0
-12
V
+12
V
-12
V
+12
V
+11V
_CH
1
CH
1_1:
1
CH
1_2:
1
CH
1_4:
1
-12
V
-11V
_CH
1
+11V
_CH
1
-11V
_CH
1
+12
V
+12V
_CH
1.1
+12V
_CH
1.1
CH
1_X
5
Y11
Y12
+7_C
H1.
1
+7_C
H1.
1
-12V
_CH
1-1
2V_C
H1
+12
V
-12
V
CH
1_4:
1
CH
1_1:
1
CH
1_2:
1
CH
1_X
5
+12
V
+11.
5V
+11.
5V
+11.5V
-12V
_CH
1
-12
V
A
A
-12
V
-12
VC
C
+12
V
CH
1_X
5_G
ND
CH
1_X
5_G
ND
-12
V
-12
V-5
.8V
Y- Input, Attenuator, Preamplifier CH1
Änderungen vorbehalten / Subject to change without notice 3
RR
ev.:
Tit
le :
Da
te :
Do
cum
en
t N
um
be
r :
87
65
43
21
ABCD
12
34
56
78
D C B A
Ae
nd
eru
ng
en
vo
rbe
ha
lte
n!
/ S
ub
ject
to
ch
an
ge
wit
ho
ut
no
tice
!
1.4V
2.8
V
2.8
V5
0m
V/D
IV
50
mV
/DIV
5 m
V1
0 m
V2
0 m
V5
0 m
V1
00
mV
20
0 m
V5
00
mV
1
V2
V
5
V1
0
V
12
34
**
**
**
**
* * *
* * * * * ** * *
4K
75
be
i O
PA
60
2A
P
-7.4
V
20
V
R41
03
3R
2
C41
23
p3
50
0V
R41
811
1K
R41
39
88
K
C4
07
68
0p
R41
410
K1
R4
29
100K
D40
1B
AS
34
2
3 1
T4
06
MM
BT9
18
SO
T-2
3w
sel
C4
32
0.1u
+C
43
410
0u 1
6V
+- 74
1
632
5
IC40
1A
D4
28
30
R4
22
47
K
C4
23
1n
R42
110
0K
R4
23
12K1
R4
28
10K
0
+C
42
41
0u
35
V
R45
11K
21C4
35
0.1u
R4
50
6K19
R4
52
6K81
C4
36
0.1u
R4
56
10K
0
R4
24
47
5R
+C
45
41
0u
35
V
R50
11K
00
13
1214
IC40
3EH
M25
4
5 3
IC40
3BH
M25
10
911
IC40
3DH
M25
7
8 6
IC40
3CH
M25
R46
95
K6
2
R47
11K
00
R4
70
4K
32
C4
47
0.1u
+
C4
48
100u
16V
C40
10
.1u
40
0V
2
15 1
16
IC40
3AH
M25
R44
13
9K
2C
43
015
0p
R4
39
50
R
1
2
3
T41
3B
C85
0S
OT
-23c
R5
00
1K00
+C
45
21
0u
35
V
C41
08
p2
20
0V
2
34 R
E40
1AA
LD12
W
98
7
RE
401B
ALD
12W
4
32
RE
402A
ALD
12W
78
9
RE
402B
ALD
12W
1
2
3
T41
4B
C86
0S
OT
-23c
R4
72
10R
0
135
7 8
642
S4
02
SW
8
135
78
642
S40
1S
W8
R41
13
32
R
R41
55R
1
R41
95
6R
2
C43
11
0n
40
0V
R41
65
6R
2
C4
08
15p
R4
26
1M00R
43
01K
00
C4
33
0.1u
R4
37
51R
1
R4
80
681R
R4
84
681R
R48
17
5R
0 R4
83
75
R0
R4
97
1K10
R4
87
1K10
R49
93
3R
2C
44
40.
1u
+C
44
51
0u
35
V
8-
73
-4
+
106
RE
401D
ALD
12W
8-9
3-
2
+ 15
RE
401C
ALD
12W
8-9
3-
2
+ 15
RE
402C
ALD
12W
8-
73
-4
+ 106
RE
402D
ALD
12W
1
2
3
T4
02
BC
860
SO
T-2
3c
R29
64
3K
2
1
2
3
T4
03
BC
860
SO
T-2
3c
R2
82
43
K2
R4
64
1M50
R4
63
1M50
R4
62
1M50
R4
38
1K50
1
2
3
T4
07
MM
BT
3640
SO
T-2
3w
sel
R4
58
150R
R4
59
75
R0
R4
60
75
R0
R4
67
18R
2
R4
48
3K
92
R4
79
100R
R4
86
100R
R4
78
6K81 R4
85
6K81
R4
73
681RR4
74
909R
R4
36
56
2R
R4
47
2K
43
R4
40
27
4R
R4
75
110R
C4
09
3p
3 5
00
V
R4
82
47
0R
C4
50
0.1u
R5
02
2K21
R49
64
R7
0
R4
98
130R
R4
88
4R
70
R4
92
10R
0
R4
20
51R
1
R4
68
75
R0
C41
42
2p
R4
42
121K
C4
29
33
0p
C45
10.
1u
1
2
3T
40
8B
C85
0S
OT
-23c
C41
70.
1uC
418
0.1u
R4
94
1K10
R4
90
1K10
2
3 1
T411
MM
BT9
18S
OT
-23
wse
l
2
31T
412
MM
BT9
18S
OT
-23
wse
l
C4
46
C41
50.
1uC
416
0.1u
2
3 1
T4
09
MM
BT9
18
SO
T-2
3w
sel R
45
71K
50
R4
49
43
2R
R4
53
51R
1
C4
38
0.1u
R4
55
1K24
C4
39
6p
8
1
2
3T
401
BC
850
SO
T-2
3c
R4
06
1K00
R4
03
12K1
R4
04
12K1
R4
02
3K
65
+
C4
49
10
u 3
5V
C41
33
-10
p
C4
05
3-1
0p
R4
27
1M00
C4
03
6p
8 2
00
V
C4
02
3-1
0p
R4
89
909RR
49
590
9R
R4
76
47
5K
R4
77
47
K
R4
93
1K10
R49
11K
10
C4
43
0.1u
C4
42
0.1u
C44
10.
1u
C4
26
0.1u
+
C4
37
10
u 3
5V
R46
1
C4
40
C4
06
8p
2 2
00
VC
40
41
2p
20
0V
C41
13
-10
p
3 21
T4
04
J310
TO
-92
135
78
642
S4
04
SW
8
R4
33
3K
32
R4
34
1K1
2
3
T41
6M
MB
T36
40
SO
T-2
3w
sel
R4
32
5K
62
C4
27
0.1u
+
C4
28
100u
16V
321 4
2 4 5 1 3
S4
03
SY
HA
1
R5
03
47
0R
R5
04
6K81
R5
05
51R
1
1
P4
00
R41
78
98
K
3
2
1 T41
7J3
10T
O-9
2 3
2
1 T41
8J3
10T
O-9
2
3
2
1
T41
9J3
10T
O-9
2
R4
65
47
5K
R46
64
75
K
R5
06
22K
1-1
2V
+12
V
-12
V
+12
V
+11V
_CH
2
CH
2_1:
1
CH
2_2:
1
CH
2_4:
1
-11V
_CH
2
+11V
_CH
2
-11V
_CH
2
-12
V
+12
V
+12V
_CH
2.1
+12V
_CH
2.1
CH
2_X
5
Y21
Y2
2
+7_
CH
2.1
+7_
CH
2.1
-12
V_
CH
2-1
2V
_C
H2
-12
V
+12
VC
H2_
4:1
CH
2_1:
1
CH
2_2:
1
CH
2_X
5
+11.
5V
+11.
5V
+11.
5V
-12
V_
CH
2
B
-12
V
B
-12
V
D
D
+12
V
-12
V
CH
2_X
5_G
ND
CH
2_X
5_G
ND
-5.8
V
-12
V
Y- Input, Attenuator, Preamplifier CHII
Änderungen vorbehalten / Subject to change without notice4
Ae
nd
eru
ng
en
vo
rbe
ha
lte
n!
/ S
ub
ject
to
ch
an
ge
wit
ho
ut
no
tice
!
RR
ev.:
Tit
le :
Da
te :
Do
cum
en
t N
um
be
r :
87
65
43
21
ABCD
12
34
56
78
D C B A
CH
1C
H2
MO
NO
DU
AL
AD
D
CS1
DU
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Y- Intermediate Amplifier CHI + CHII, Channel Switch + Chopper Generator,Analog/ digital Switch, TRIG. and X- Signal Amplifier
Änderungen vorbehalten / Subject to change without notice 5
Trigger Amplifier, Trigger Coupling,TV Sync. Separator,Peak Value Detection, Trigger Comparator
Änderungen vorbehalten / Subject to change without notice6
Timebase Sweep & Hold off Generator
Änderungen vorbehalten / Subject to change without notice 7
Component Tester, Calibrator
Änderungen vorbehalten / Subject to change without notice8
Timebase, Trigger Logic
Änderungen vorbehalten / Subject to change without notice 9
XY- Amplifier, YF- Amplifier, Overscan Circuit
Änderungen vorbehalten / Subject to change without notice10
Front/ Controlboard
Änderungen vorbehalten / Subject to change without notice 11
CRT- Circuit, Unblanking, CRT- Board
Änderungen vorbehalten / Subject to change without notice12
Power Supply
ABCD
87
65
43
21
D C B A
12
34
56
78
Tit
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Re
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K
R1
04
27
50
K
B1013
+
C1031
22
u 1
60
V
L1
00
76
8u
H 1
.5A
+
C1
03
61
0u
25
0V C
10
37
0.1
u 2
50
VM
KT
13
14
15
16
17
18
19
20
21
C1
04
0
0.1
u 5
0V
+
C1
00
83
30
u 2
5V
R1
03
80
R0
C1
03
94
n7
50
V
D1006
LL4151
R1
05
03
32
K
R1
04
8301K
R1
04
95
6K
2
1
3
2
T1
00
1B
UX
86
TO
-12
6
B1001
R1
07
3
R2
07
1K
0R
10
74
75
K+
C1
03
81
u 5
0V
LIN
E
+1
85
V
+141V
+5
V
31
V
+1
2V
-12
V
+1
2V
G1
LIN
E
+1
2V
-12
V
G1
-13
.5V
+1
3.5
V
12
.9V
0.4
V
+1
3.5
V
-13
.5V
HV
C
+1
2V
-12
V+
12
V-1
2V
+141V
+1
85
V
-12
V+
12
V
+5
V
6.3
V
FO
KU
S
HT
14
-19
50
V
-19
50
V
+1
2V
BLV
BLV
HT
1
HT
14
-2
02
5V
HT
1
Änderungen vorbehalten / Subject to change without notice 13
Driver Stage (A/D)
Änderungen vorbehalten / Subject to change without notice14
A/D Converter, Address Counter, RAM'S, Timebase (Digital), Control Logic
Änderungen vorbehalten / Subject to change without notice 15
Display- Control, Address Counter, RAM, Control Logic, HAMEG Bus Driver
Änderungen vorbehalten / Subject to change without notice16
Y D/A Converter, Dot Join, Y- Analog Output Driver
Änderungen vorbehalten / Subject to change without notice 17
+5V Analog Power Supply, IC Power Supply
Änderungen vorbehalten / Subject to change without notice18
YPA Board (Topside)
Änderungen vorbehalten / Subject to change without notice 19
R
[27.3;8.3]
YPA Board (Bottomside)
Änderungen vorbehalten / Subject to change without notice20
Power Supply Board (Topside)
Änderungen vorbehalten / S
ubject to change without notice
21
P1002
P1003
P1004LINE
BLVFOCUSG1-1950VHT1HT14
P1005P1006
LIN
E+5
VP1007
P1008P1009
GN
D+1
2V-1
2V
+5V
+5V
GN
D+1
2V-1
2V
BLVHT1HT14-2025V
HVC
+185
V+1
41V
GN
D
+12V
-12V
GN
DG
ND
+12V
-12V
4.R1003
3.R1004
1.R1008
2.R1016
INT. max. CUT-OffLEVEL
4.1 INTENS. on max.4.2 adjust for max. intensity
3.1 INTENS. on min.3.2 adjust for dark screen
+12V±10mVat 0,95A load current
+141V±0,2Vat 60mA load current
Ad
justm
en
t Pla
n : P
ow
er S
up
ply
Bo
ard
Änderungen vorbehalten / Subject to change without notice22
Digital Board (Topside)
Änderungen vorbehalten / Subject to change without notice 23
Adjustment Plan: Digital Board
Änderungen vorbehalten / Subject to change without notice24
Front Controlboard (Topside, Bottomside)
Änderungen vorbehalten / Subject to change without notice 25
CRT Board (Topside, Bottomside)
Änderungen vorbehalten / Subject to change without notice26
XY Board (Topside)
Änderungen vorbehalten / Subject to change without notice 27
XY Board (Bottomside)
Änderungen vorbehalten / Subject to change without notice28
TB Board (Topside)
Änderungen vorbehalten / Subject to change without notice 29
TB Board (Bottomside)
Änderungen vorbehalten / Subject to change without notice30
CCT Board (Topside, Bottomside)
Änderungen vorbehalten / Subject to change without notice 31
AdjustmentProcedure
Änderungen vorbehalten / Subject to change without notice32
ADJUSTMENT PROCEDURE
Digital Storage Scope HM305
WARNINGThe Instrument must be disconnected from the mains power supply whenever you openthe case, repair or exchange parts.
HIGH VOLTAGE WARNING!
Hazardous High Voltage of up to 2,000 Volts is present inside this Instrument. The areas particularlyaffected by High Voltage are the high voltage circuit on the PS-board, the CRT-board and the CRT-socket.
SERVICE AND ADJUSTMENT
• of this instrument should only be performed in accordance and in conjunction with the operatingmanual and the WARNINGS contained therein.
• should only be performed by suitable qualified and experienced service personnel, or should bereferred to one of the HAMEG companies listed on the rear cover of the manual.
Test Instruments required:
1) Scope Tester HZ60-2.2) Constant amplitude sinewave generator, 20Hz - 250MHz, output 5mV - 5V into 50Ω,
preferably with 20dB attenuation (e.g. HM8133, TEK SG502 + TEK SG503).3) Amplitude Calibrator with 1kHz squarewave output and 600Ω impedance, risetime faster than
150ns.Output voltage 2mV - 20Volts in 1-2-5 sequence for 4 divisions display amplitude(e.g. HZ62, TEK PG506).
4) Time mark generator from 5ns/div to 5s/div. Output min. 10mV into 50Ω(e.g. HZ62, TEK TG501).
5) Pre-attenuator 2:1 (1MΩ , 12-48pF), e.g. HZ20.6) 50Ω BNC through termination, e.g. HZ22.7) 2 BNC-cables, 50Ω, e.g. HZ34.8) BNC-T-connector.9) Oscilloscope probe 10:1, with exactly 9MΩ series resistance and compensated
for test oscilloscope mentioned under 10).10) Oscilloscope 100MHz, 5mV/div to 5V/div, e.g. HM1005.11) Trimming/adjusting tool.12) Variable output safety insulation transformer.13) Video signal generator with positive and negative signal output.14) Yt-EPROM HM1007.
This procedure covers all adjustments and the most important - but not all - performance checks.The correct sequence of all adjustment steps must be strictly followed.
Exact adjustment is only possible when any influence of the earths‘ magnetic field has beencompensated with the trimmer marked TR (trace rotation).
All adjustments should only be performed by qualified and experienced personnel. This is particularlyimportant for adjustments in the high voltage section of the instrument.
Änderungen vorbehalten / Subject to change without notice 33
1) R1008: +141 Volt supply. ................................................................................................. 352) R1016: +12 Volt supply. ................................................................................................... 353) RV7000: Trace Rotation Check. ....................................................................................... 354) R1004 : CRT minimum intensity. ..................................................................................... 355) R1003 : CRT maximum intensity. .................................................................................... 356) R712: Mean Y-plate Potential Channel I. ......................................................................... 357) R714: Mean Y-plate Potential Channel II. ........................................................................ 378) RV6021 : Astigmatism correction. ................................................................................... 379) R640: Y-Gain CH I. ........................................................................................................... 3710) R122: FET operating point CH I. .................................................................................... 3711) R203: Invert-Balance CH I. ............................................................................................ 3712) R177: Variable-Balance CH I. ......................................................................................... 3713) R139: 100Hz Squarewave 5mV/div CH I. ...................................................................... 3814) R134: 100Hz Squarewave 1mV/div Adjustment CH I. .................................................. 3915) R658: Y-Gain CH II. ........................................................................................................ 3916) R422: FET operating point CH II. ................................................................................... 3917) R503: Invert-Balance CH II. ........................................................................................... 3918) R477: Variable-Balance CH I. ......................................................................................... 3919) R439: 100Hz Squarewave 5mV/div CH II. ..................................................................... 3920) R434: 100Hz Squarewave 1mV/div CH II. ..................................................................... 3921) RV2005 (A), RV2006 (C), CV2000 (D) and CV2001 (B): ................................................. 4122) Y-Amplifier Bandwidth Check. ....................................................................................... 4123) C111 (A)/113 (B)/102 (C)/105 (D):Attenuator Compensation CH I. ............................... 4124) C411 (A)/413 (B)/402 (C)/405 (D): Attenuator Compensation CH II. ............................. 4125) RV2501 (A): Storage Mode Y-Gain ................................................................................ 4326) RV9101: Dot-Join Overshoot ......................................................................................... 4327) RV9700 (A), RV9701 (B): Digital Y-Gain/Offset CH I. ..................................................... 4328) RV9800 (A), RV9801 (B): Digital Y-Gain/Offset CH II. .................................................... 4329) R663: Digital ADDition/Offset. ....................................................................................... 4530) RV2417 (A), RV2418 (B): Overscan. .............................................................................. 4531) RV3421 (A), RV2225 (B): Digital Time Base Adjustment. .............................................. 4532) RV3519 (A)/3589 (B)/3591 (C), CV3511 (D): Analogue Time Base. ............................... 4533) RV2234: X-Magnification x10. ....................................................................................... 4734) RV2260: X-Amplifier Symmetry ..................................................................................... 4735) R624: XY-Gain ................................................................................................................ 4736) RV3293: Trigger-Symmetry ............................................................................................ 4737) R612: DC-Triggering CH I. ............................................................................................. 4738) R603: DC-Triggering CH II. ............................................................................................ 4739) RV2301 (A), RV4322 (B): Component Tester Y-Position and Tilt. .................................. 4940) RV8940: Calibrator Output. ............................................................................................ 4941) Trigger Filter Check. ....................................................................................................... 4942) Triggerbandwidth Check. ............................................................................................... 4943) External Trigger Check. .................................................................................................. 4944) Video Trigger Check. ...................................................................................................... 5045) Pretrigger Check. ........................................................................................................... 5046) Interface Connector Check. ........................................................................................... 50 Writing data into memory .............................................................................................. 51
NOTEThe adjustment procedures assume that the instrument had once been properly adjusted inthe factory and adjustments are required due to temperature drift or the replacement ofdefective components.
Before starting each adjustment procedure, set the oscilloscope to the following basic settings:• Press POWER pushbutton (in!).• Release all other pushbuttons (out!) except AC/DC input coupling.• Rotate the three variable controls (TIME/DIV. and VOLTS/DIV.) to their (calibrated) detent positions.• Set TIME/DIV. switch to 50µs/div.• Set both VOLTS/DIV switches to 5mV/div.• Rotate the HOLD OFF knob fully counterclockwise.• Trigger coupling set to AC.• Set all other controls to their midrange positions.• If different settings are required, they are mentioned particularly for each subject.
Table of Contents
Änderungen vorbehalten / Subject to change without notice34
Ω
3
21
PS-Board Front panel
6
7 YPA-Board
45 8 Pin 2 Pin 4
XY-BoardPS-Board
Änderungen vorbehalten / Subject to change without notice 35
(1) R1008: +141 Volt supply.
WARNING: To avoid damage use a fully insulated screwdriver!Locate and identify R1008 (1) on PS-Board (screened section).Locate 8 pole checkpoint socket on XY-Board and identify pin 2.Adjust R1008 (1) for exactly +141 Volts (± 0.1 Volt) in respect to ground.
(2) R1016: +12 Volt supply.
Locate and identify R1016 (2) on PS-Board.Locate 8 pole checkpoint socket on XY-Board and identify pin 4.Adjust R1016 (2) for exactly +12Volts (± 10mV) in respect to ground.All other voltages +185V (pin 1), -12V (pin 5) and -1950V on cathode
of CRT depend on the correct +12Volt adjustment.All these voltages must be checked and verified.
(3) RV7000: Trace Rotation Check.
Locate and identify RV7000 (3) „TR“ on front panel.Using Y-Pos.I and X-Pos. controls, move baseline to the center of the graticule.Press channel I GD pushbutton (in!).When turning RV7000 (3), check that the range of inclination of the baseline is at least
1mm at both horizontal limits of the graticule.Readjust baseline exactly parallel to the horizontal center line of the graticule.
(4) R1004 : CRT minimum intensity.
Locate and identify R1004 (4) on PS-Board.Set INTENS. control to fully left position.Press XY pushbutton (in!).Adjust R1004 (4) so that the dot just disappears.Release XY pushbutton.
(5) R1003 : CRT maximum intensity.
Locate and identify R1003 (5) on PS-Board.Set INTENS. control to fully right position.Set FOCUS control for optimum sharpness.Adjust R1003 (5) so that the beam diameter is 1.5mm.Repeat adjustment (4) and (5) until optimum is obtained!
(6) R712: Mean Y-plate Potential Channel I.
Locate and identify R712 (6) on YPA-Board.Press DUAL pushbutton (in!).Set both beams to the horizontal center of the graticule by using Y-POS. I and Y-POS. This settings must not be changed during until item 6) and 7) are finished.Release DUAL pushbutton (out!) - channel I mode -.Switch the oscilloscope OFF.Locate and identify both lines from the Y-final amplifier to the Y-plates of the CRT.Connect both lines galvanically (short).Switch the oscilloscope ON.Measure the DC voltage at the Y-plates in respect to ground.Adjust R712 (6) for +85Volt Y-plate voltage.
Note: Do not remove the short at the Y-plates until item 7) is finished.
Änderungen vorbehalten / Subject to change without notice36
10
127 11 9
8
YPA-Board
PS-Board
Änderungen vorbehalten / Subject to change without notice 37
(7) R714: Mean Y-plate Potential Channel II.
Locate and identify R714 (7) on YPA-Board.Press CH I/II pushbutton (in!) for channel II mode.Measure the DC voltage at the Y-plates in respect to ground.Adjust R714 (7) for +85Volt Y-plate voltage.Switch the instrument OFF.Remove the connection between both Y-plates.Switch instrument ON.
(8) RV6021 : Astigmatism correction.
Locate and identify RV6021 (8) on CRT-Board.Connect a 1MHz squarewave signal with 25mVpp at 50Ω (HZ22) to input CHI.Set time base to 1µs/div.Adjust FOCUS control for optimum sharpness.Adjust RV6021 (8) until leading edge and top of signal have equal sharpness.Recheck range of FOCUS control.Adjust FOCUS control for optimum sharpness.
(9) R640: Y-Gain CH I.
Locate and identify R640 (9) on YPA-Board.Connect a 25mV/1kHz squarewave signal via 50Ω cable and 50Ω through terminator to input channel I.Set time base to 1ms/div.Adjust R640 (9) for 5 division signal height.
(10) R122: FET operating point CH I.
Locate and identify R122 (10) in CH I section of the YPA-Board.Release all pushbuttons (out!) for channel I mode.Press Y x5 channel I (in!) for 1mV/div.Press GD pushbutton channel I (in!).Switch the attenuator channel I constantly between 5mV/div (1mV) and 10mV/div (2mV).Adjust R122 (10) until no Y-position change occurs.
(11) R203: Invert-Balance CH I.
Press GD pushbutton channel I (in!).Press Y x5 channel I (in!) for 1mV/div.Using Y-POS.I control set trace to the horizontal center line.Locate and identify R203 (11) on YPA-Board.Adjust R203 (11) so that the baseline will not move, when pressing and releasing
the INVERT CH I pushbutton.
(12) R177: Variable-Balance CH I.
Locate and identify VR177 (12) in CH I section of the YPA-Board.Press channel I Y-MAG. x5 pushbutton for 1mV/div.Press channel I GD pushbutton (in!).Adjust VR177 (12) so that the baseline will not move when turning the channel I Y-variable
control through the entire range.Check adjustment 11) again and repeat it if required.
Änderungen vorbehalten / Subject to change without notice38
(13) R139: 100Hz Squarewave 5mV/div CH I.
Locate and identify R139 (13) in CH I section of the YPA-Board.Connect a 25mV/100Hz squarewave signal via 50Ω cable and 50Ω through
terminator to input channel I.Set time base to 2ms/div.Check that DC input coupling is selected.Adjust R139 (13) for flat top.
19
181715
16 13
1420
YPA-Board
Änderungen vorbehalten / Subject to change without notice 39
(14) R134: 100Hz Squarewave 1mV/div Adjustment CH I.
Locate and identify R134 (14) in CH I section of the YPA-Board.Connect a 5mV/100Hz squarewave signal via 50Ω cable and 50Ω through terminator to input channel I.Press Y x 5 channel I (in!) for 1mV/div.Set time base to 2ms/div.Check that DC input coupling is selected.Adjust R134 (14) for flat top.
(15) R658: Y-Gain CH II.
Locate and identify R658 (15) on YPA-Board.Connect a 25mV/1kHz squarewave signal via 50Ω cable and 50Ω through terminator to input channel II.Set input coupling to DC.Set time base to 1ms/div.Adjust R658 (15) for 5 division signal height.
(16) R422: FET operating point CH II.
Locate and identify R422 (16) in CH II section of the YPA-Board.Press CHI/II pushbutton (in!) for channel II mode.Press Y x5 channel II (in!) for 1mV/div.Press GD pushbutton channel II (in!).Switch the attenuator channel II constantly between 5mV/div (1mV) and 10mV/div (2mV).Adjust R422 (16) until no Y-position change occurs.
(17) R503: Invert-Balance CH II.
Press GD pushbutton channel II (in!).Press Y x5 channel II (in!) for 1mV/div.Using Y-POS.II control set trace to the horizontal center line.Locate and identify R503 (17) on YPA-Board.Adjust R503 (17) so that the baseline will not move, when pressing and releasing
the INVERT CH II pushbutton.
(18) R477: Variable-Balance CH II.
Locate and identify VR477 (18) in CH II section of the YPA-Board.Press channel II Y-MAG. x5 pushbutton for 1mV/div.Press channel II GD pushbutton (in!).Adjust VR477 (18) so that the baseline will not move when turning the channel II Y-variable
control through the entire range.Check adjustment 17) again and repeat it if required.
(19) R439: 100Hz Squarewave 5mV/div CH II.
Locate and identify R439 (19) in CH II section of the YPA-Board.Connect a 25mV/100Hz squarewave signal via 50Ω cable and 50Ω through terminator
to input channel II.Set time base to 2ms/div.Check that DC input coupling is selected.Adjust R439 (19) for flat top.
(20) R434: 100Hz Squarewave 1mV/div CH II.
Locate and identify R434 (20) in CH II section of the YPA-Board.Connect a 5mV/100Hz squarewave signal via 50Ω cable and 50Ω through terminator to input channel II.Press Y x 5 channel II (in!) for 1mV/div.Set time base to 2ms/div.Check that DC input coupling is selected.Adjust R434 (20) for flat top.
Änderungen vorbehalten / Subject to change without notice40
A C D B
24
B D C A
23
C D A B
21
XY-Board
YPA-Board
Änderungen vorbehalten / Subject to change without notice 41
(21) RV2005 (A), RV2006 (C), CV2000 (D) and CV2001 (B):
Y-Final Amplifier.
Connect a 1MHz squarewave signal of 25mV via 50Ω cable and 50Ω throughterminationto input CH I.
Check that DC input coupling is selected.Set time base to 0.2µs/div.Locate and identify RV2005, RV2006, CV2000 and CV2001 on XY-Board.As the capacitive influence of the cabinet is of importance, a metal sheet above
the Y-final amplifier section is required.Adjust RV2005 (21A) and CV2001 (21B) for flat top, RV2006 (21C) and CV2000 (21D) for fast
leading edge with minimum overshoot.Repeat until optimum is obtained.Check channel II under the same conditions.
(22) Y-Amplifier Bandwidth Check.
Connect a 40mVpp/50kHz sinewave signal from a constant amplitude generatorvia a 50Ω throughtermination to the input of channel I.
Adjust the generator amplitude for 8 div. display height on the screen.Increase the generator frequency until the signal is displayed with 5.6 div. height ( -3dB).Repeat the adjustment under item 21), if the frequency reading on the generator shows
a value less than 30MHz.Press CHI/II-TRIGI/II pushbutton (in!).Connect a 40mVpp/50kHz sinewave signal from a constant amplitude generator
via a 50Ω throughtermination to the input of channel II.Adjust the generator amplitude for 8 div. signal height displayed on the screen.Increase the generator frequency until the signal is displayed with 5.6 div. height ( -3dB).Repeat the adjustments under item 21), if the frequency reading on the generator shows
a value less than 30MHz.
(23) C111 (A)/113 (B)/102 (C)/105 (D):Attenuator Compensation CH I.
Locate and identify trimmers VC102-113 for CH I on YPA-Board.Check that DC input coupling is selected.Set amplitude calibrator to 1kHz and connect a 2:1 pre-attenuator via 50Ω cable to input of CH I.Set calibrator output voltage to 80mVpp (40mVpp at the 2:1 pre-attenuator output,
if terminated with 1MΩ).Check that input attenuator CH I is set to 5mV/div.Adjust trimmer in pre-attenuator for flat squarewave top. This adjustment must not
be changed during the following procedure.Adjust compensation as listed in the table below:
Oscilloscope Input AdjustmentInput Atten. CH I
250mVpp 50mV/div VC111 (A) flat top + VC113 (B) edge2.5Vpp 0.5V/div VC102 (C) flat top + VC105 (D) edge
24) C411 (A)/413 (B)/402 (C)/405 (D): Attenuator Compensation CH II.
Locate and identify trimmers VC402-413 for CH II on YPA-Board.Check that DC input coupling is selected.Set amplitude calibrator to 1kHz and connect a 2:1 pre-attenuator via 50Ω cable to input of CH I.Set calibrator output voltage to 80mVpp (40mVpp at the 2:1 pre-attenuator output,
if terminated with 1MΩ).Check that input attenuator CH II is set to 5mV/div.Adjust trimmer in pre-attenuator for flat squarewave top.Adjust compensation as listed in the table below:
Oscilloscope Input AdjustmentInput Atten. CH I
250mVpp 50mV/div VC411 (A) flat top + VC413 (B) edge2.5Vpp 0.5V/div VC402 (C) flat top + VC405 (D) edge
Änderungen vorbehalten / Subject to change without notice42
ABA B
2728
25A
26 25B
XY-Board
Digi-Board
Änderungen vorbehalten / Subject to change without notice 43
(25) RV2501 (A): Storage Mode Y-Gain
RV9100 (B): Storage Mode Y-Symmetry
Release POWER pushbutton (out!).Locate and identify IC9204 (RAM) on DIGI-Board.Remove IC9204 from the socket.Insert Yt-EPROM HM1007 in the RAM socket.Locate and identify RV2501 (25A) on XY-Board.Locate and identify RV9100 (25B) on Digi-Board.Press POWER pushbutton (on!).Press STOR. pushbutton (in!).Press DUAL pushbutton (in!).Now two horizontal lines should be visible.Adjust RV9100 (25B) to move the upper horizontal line to that graticule line which is 1 division
under the horizontal center line of the graticule.Adjust RV2501 (25A) to get a distance of exactly 2 divisions between both horizontal lines.If necessary repeat both adjustments until optimum is obtained.For the next adjustment the Yt-EPROM is again required.
Please note: As a result of the crt deflection non-linearities and the influence of the earths‘magnetic field, minor deviations from the optimum are unavoidable.
(26) RV9101: Dot-Join Overshoot
Locate and identify RV9101 (26) on Digi-Board.Press the X-MAG. x10 pushbutton (in!).Turn the X-POS. control to make the signal start visible. The signal starts with the first dot
underneath the following horizontal line.Adjust RV9101 (26) to a sharp but overshoot free transition from the first dot to the horizontal line.
Release POWER pushbutton (out!).Remove Yt-EPROM from the socket.Insert IC9204 (RAM) in the RAM socket.Press POWER pushbutton (in!).
(27) RV9700 (A), RV9701 (B): Digital Y-Gain/Offset CH I.
Locate and identify RV9700 (27A) and RV9701 (27B) on Digi-Board.Release CH I/II pushbutton (out!).Connect a 25mV/1kHz squarewave signal via 50Ω cable and 50Ω through terminator to input channel I.Set time base to 1ms/div.Check that the STOR. pushbutton is released (out!).Move signal with Y-POS I control to the 0% and 100% marker lines and remember signal
height and position.Press STOR. pushbutton (in!) for digital mode.Adjust RV9700 (27A) for the same signal height and RV9701 (27B) for the same Y-position
of the signal as before in analogue mode.Release and press STOR. and watch the display.There should be no difference between analogue and digital mode.
(28) RV9800 (A), RV9801 (B): Digital Y-Gain/Offset CH II.
Locate and identify RV9800 (28A)and RV9801 (28B) on Digi-Board.Press CH I/II pushbutton (in!).Connect a 25mV/1kHz squarewave signal via 50Ω cable and 50Ω through terminator to input channel II.Set time base to 1ms/div.Move signal with Y-POS II control to the 0% and 100% marker lines and remember
signal height and position.Press STOR. pushbutton (in!) for digital mode.Adjust RV9800 (28A) for the same signal height and RV9801 (28B) for the same Y-position
of the signal as before in analogue mode.Release and press STOR. and watch the display.There should be no difference between analogue and digital mode.
Änderungen vorbehalten / Subject to change without notice44
29
B C A D32
31A
B A
Pin 5Pin 1
30
31B
TB-Board XY-Board
YPA-Board TB-Board
Änderungen vorbehalten / Subject to change without notice 45
(29) R663: Digital ADDition/Offset.
Press DUAL pushbutton (in!).Locate and identify R663 (29) on YPA-Board.Set input coupling CH I and II to GD.Press STOR. pushbutton (in) for digital mode.Move both baselines with Y-POS. I and II controls to the horizontal center line of the graticule.Release DUAL pushbutton (out!).Press ADD pushbutton (in!).Adjust R663 (29) for the same signal position as before in DUAL storage mode.
(30) RV2417 (A), RV2418 (B): Overscan.
Locate and identify RV2417 (30A) and RV2418 (30B) on XY-Board.Press channel I and channel II GD pushbuttons (in!).Press DUAL pushbutton (in!).Set baseline with Y-POS.I control to the top line of the graticule.Set baseline with Y-POS.II control to the bottom line of the graticule.Adjust RV2417 (30A) for just lighting up of the upper LED.Adjust RV2418 (30B) for just lighting up of the lower LED.Repeat both procedures until both adjustments are correct.
(31) RV3421 (A), RV2225 (B): Digital Time Base Adjustment.
Locate and identify RV3421 (A) on TB-Board.Locate and identify pin 7 of test socket on XY-Board.Press STOR. button (in !).Measure sawtooth with an oscilloscope and a 10:1 probe at pin 7 of test socket and
adjust RV3421 (31A) for 4.8Vpp signal height.Locate and identify RV2225 (31B) on XY-Board.Set time base to 20µs/div.Set Time Mark generator to f= 50kHz and connect signal to CH I input.Set input attenuator channel I for approx. 4 divisions signal amplitude on the CRT.Move trace with X-POS. control so that the first time mark coincides with the first left
graticule line of the screen.Adjust RV2225 (31B) so that the 11th time mark coincides with the last right graticule line.
(32) RV3519 (A)/3589 (B)/3591 (C), CV3511 (D): Analogue T ime Base.
a) As the Digi-Board is located above the adjustment points of the TB-board, the adjustmentpoints are not accessible from the top side, but from the bottom side of the PCB.
Locate and identify RV3519 (32A) on TB-Board.Check that the time base setting is 20µs/div. and time base variable control is in CAL position.Press and release STOR. pushbutton and adjust RV3519 (32A) for the same analog
trace start position as in digital mode.Release STOR. pushbutton (out!).
b) Locate and identify RV3591 (32C) on TB-Board.Set Time Mark generator to f= 20kHz and connect signal to CH I input.Set time base to 50µs/div.Move trace with X-Pos. control so that the first time mark coincides with the first left
graticule line of the screen.Adjust RV3591 (32C) so that the 11th time mark coincides with the last right graticule line.Rotate time base variable control to fully left position.Now more than 2.5 time marks per division should be displayed.
c) Locate and identify CV3511 (32D) on TB-Board.Set Time base to 0.5µs/div. and time base variable control to CAL position.Set Time Mark generator to f= 2MHz.Move trace with X-POS. control so that the first time mark coincides with the first left
graticule line of the screen.Adjust CV3511 (32D) so that the 11th time mark coincides with the last right graticule line.
d) Locate and identify RV3589 (32B) on TB-Board.Set Time base to 5ms/div. and time base variable control to CAL position.Set Time Mark generator to f= 200Hz.Move trace with X-POS. control so that the first time mark coincides with the first left
graticule line of the screen.Adjust RV3589 (32B) so that the 11th time mark coincides with the last right graticule line.Check all time base settings with suitable time mark signals.
Änderungen vorbehalten / Subject to change without notice46
34 33
36
38 35 37YPA-Board XY-Board
TB-Board
Änderungen vorbehalten / Subject to change without notice 47
(33) RV2234: X-Magnification x10.
Locate and identify RV2234 (33) on XY-Board.Check that STOR. pushbutton is released (out!).Press pushbutton X-Mag. x10.Set time base to 50µs/div.Set Time Mark generator to f= 20kHz and connect signal to CH I input.Set X-POS control to mechanical center.Using X-POS control, move the visible time mark to the first left graticule line.Adjust RV2234 (33) so that the next time mark coincides with the last (right) graticule line.Release X-MAG. x10 pushbutton (out!).
(34) RV2260: X-Amplifier Symmetry
Set time base to 20µs/div.Release STOR. pushbutton (out!).Locate and identify RV2260 (34) on XY-Board.Set X-POS control to mechanical center.Adjust RV2260 (34) for a symmetrical trace start and trace end position in respect to the graticule.
(35) R624: XY-Gain
Connect a 1kHz squarewave signal of 25mVpp amplitude (HZ60-2) to input CH II.Check that the CH II input sensitivity is 5mV/div.Check that input coupling CH II is set to DC.Locate and identify R624 (35) on YPA-Board.Press XY pushbutton.Set X-POS control that the left dot coincides with the graticule center.Adjust R624 (35) for a distance of 5 division between left and right dot.
(36) RV3293: Trigger-Symmetry
Locate and identify RV3293 (36) on TB-Board.Connect a 50kHz sinewave signal of 40mVpp amplitude to input CH I.Set input coupling CH I to AC.Check that trigger coupling is in AC position.Set attenuator switch CH I to 0.1V/div (calibrated position).Press AT/NORM. pushbutton (in!).Turn LEVEL control for triggering (center position).Reduce signal height and correct LEVEL setting for just triggering with a minimum signal height.Press and release the trigger SLOPE ± pushbutton and adjust RV3293 (36) for stable triggering
in both SLOPE conditions.
(37) R612: DC-Triggering CH I.
Locate and identify R612 (37) on YPA-Board.Connect a 50kHz sinwave signal to input CH I.Set generator amplitude to 8cm.Set time base to 10µs/div.Press AT/NORM. pushbutton (in!).Turn LEVEL control to the center position.Release AC/DC input coupling pushbutton channel I (out!).Constantly switch between AC and DC trigger coupling and watch the trace start position.Adjust R612 (37) so that there is no difference regarding the signal start position on the
signal slope between DC and AC trigger coupling.
(38) R603: DC-Triggering CH II.
Locate and identify R603 (38) on YPA-Board.Connect a 50kHz sinwave signal to input CH II.Press CH I/II-TRIG I/II pushbutton (in!).Set generator amplitude to 8cm.Set time base to 10µs/div.Press AT/NORM. pushbutton (in!).Turn LEVEL control to the center position.Release AC/DC input coupling pushbutton channel II (out!).Constantly switch between AC and DC trigger coupling and watch the trace start position.Adjust R603 (38) so that there is no difference regarding the signal start position on the signal
slope between DC and AC trigger coupling.
Änderungen vorbehalten / Subject to change without notice48
40
39A
39B
Pin 14Pin 1
XY-Board
CT-Board
Änderungen vorbehalten / Subject to change without notice 49
(39) RV2301 (A), RV4322 (B): Component Tester Y-Position and Tilt.
Release all pushbuttons (out!).Press COMPONENT TESTER pushbutton (in!).Locate and identify RV2301 (39A) on XY-Board.Adjust RV2301 (39A) to shift the approx. 8 div. horizontal component tester trace to the
horizontal center of the CRT graticule.Locate and identify RV4322 (39B) on CC-Board.Set up the instrument on a table in normal operating conditions to avoid misadjustment due
to the influence of the earth magnetic field.Adjust RV4322 (39B) in such a way that the trace is parallel to the horizontal graticule
center line and not tilt.
(40) RV8940: Calibrator Output.
Locate and identify VR8940 (40) on CC-Board.Connect a digital multimeter to the 0.2Vpp calibrator output.Set up the digital multimeter for DC measurement in a suited sensitivity setting.Locate and identify IC8903 on CC-Board.Connect pin 1 and pin 14 of IC8903 galvanically together.Adjust VR8940 (40) for exactly 0.2V DC.Check 2V calibrator output.Remove the connection between pin 1 and pin 14 of IC8903.
Connect a 10:1 probe to the 0.2Vpp calibrator output and connect it to the CH I input of the scope.Release all pushbuttons (out!).Select CH I DC input coupling.Set attenuator CH I to 5mV/div (calibrated detent).Set time base to 0.2ms/div.Now approximately 2 signal periods should be visible on the screen.Press 1kHz/1MHz pushbutton (in!).Set time base to 0.5µs position.Check 1MHz calbrator signal.
Please note: Neither the calibrator frequency nor the pulse duty factor are specified.
(41) Trigger Filter Check.
Set time base to 1ms/div.Connect a 1kHz sinewave signal of 40mVpp amplitude to input CH I and check for full
screen deflection.Set input attenuator CH I to 50mV/div and check for 8mm display height.Select trigger coupling from AC to DC and LF. The signal must always trigger .Set sinewave generator to 50kHz and 40mV output amplitude and check for 8mm display height.Select trigger coupling from AC to DC. The signal must always trigger.Select LF trigger coupling. Now the signal should not trigger.
(42) Triggerbandwidth Check.
Set time base to 0.05µs/div, time base variable to CAL position.Set input coupling switch CH I to DC.Set trigger coupling to AC.Release AUTO/NORM pushbutton (out!).Set input attenuator CH I to 5mV/div.Connect a 100MHz sinewave signal to input CH I.Adjust generator output for 5mm display height.The signal must be triggered.
(43) External Trigger Check.
Set time base to 20µs/div.Set input attenuator CH I to 0.1V/div.Connect a 50kHz sinewave signal via a 50Ω through terminator with an amplitude of 280mVpp(100mVrms) to input CH I and check for 2.8div display height.Set LEVEL to midrange position.Check that the Trigger-LED is ON.Press EXT. pushbutton. The Trigger-LED (TR) should now be OFF.
Änderungen vorbehalten / Subject to change without notice50
Set input coupling CH I to GD.Remove signal cable from input CH I and connect it to TRIG.INP. socket. Do not change
generator settings.Now the Trigger-LED should be ON again.
(44) Video Trigger Check.
Set CH I input coupling switch to DC.Connect video signal with positiv sync. pulses to input CH I.Adjust input attenuator switch CH I for 1 div display amplitude of video signal.Set time base to 5ms/div ( time base ≥ 1ms/div = frame triggering).Set trigger coupling switch to TV.Check that trigger starts with vertical sync. pulses.Now approx. 2.5 frames should be visible.Change polarity of video signal.Press SLOPE pushbutton (in!).Again approx. 2.5 frames should be displayed triggered.Set time base to 20µs/div ( time base range 0.5ms/div - 0.1µs/div = line triggering).Recheck trigger SLOPE pushbutton procedure, using video signal with polarity change.
Note: Invert pushbutton does not affect trigger polarity.
(45) Pretrigger Check.
Release all pushbuttons (out!).Press STOR. pushbutton (in!).Connect a 1kHz squarewave signal with 25mVpp amplitude at 50Ω to CH I input.The signal display should start (left) with a rising edge which should be set on the
upmost left graticule line by turning the X-POS. knob.Press PRE-TRIG. pushbutton (in!).The rising edge should now be visible in the center range of the screen.
(46) Interface Connector Check.
Readout of data memory:
Switch the oscilloscope OFF (POWER pushbutton out!).Connect the HAMEG Graphic Printer HD148 (Software ≥ V1.3) with the HM305.Press HM305 POWER pushbutton (in!).Press HD148 POWER pushbutton (in!).Press HM305 STOR. pushbutton (in!).Insert suited signals to the channel I and II inputs.Press DUAL pushbutton (in!).Press HOLD pushbutton (in!).Set HD148 to ONLINE MANUAL without ZOOM function.Press PRINT pushbutton.Check the hardcopy for deviations in respect to the oscilloscope display.Release HOLD pushbutton (out!).Press AUTO/NORM pushbutton (in!) for normal trigger mode.Turn LEVEL knob for triggering.Press TRIG EXT. pushbutton so that no further triggering occurs.Select SINGLE-mode (SGL) and check that the RESET LED is ON.SET HD148 to ONLINE AUTOMATIC mode.Release and press the TRIG EXT pushbutton to generate a trigger event.Check that after the data aquisition the RESET LED is OFF and the HD148 starts printing.Check that after the print procedure is finished, the printer switches the RESET light-emitting diode ON.
Deviations of more than 2mm in amplitude and/or position are unacceptable.
Switch off the graphic printer and the oscilloscope and disconnect the Printer-cable from the scope.
Änderungen vorbehalten / Subject to change without notice 51
Writing data into memory
Check that the oscilloscope is switched OFF.Connect HO79-5 with HM305.Set HO79-5 to RS232 or IEEE-488 device mode.In IEEE mode, connect HO79-5 via HZ72 to a suited IEEE-488-bus controller (PC).Press the HM305 HOLD pushbutton (in!).Press the HM305 POWER pushbutton (in!).Check that random dots are visible on the screen.Start the software SP91 version ≥ 3.6 to write data from the PC into the oscilloscopes memory.Transmit signal data stored in the PC‘s memory to HO79-5 and HM305.Check that the transmitted signals are visible on the screen.
Hongkong
HAMEG LTDFlat B, 7/F,Wing Hing Ind. Bldg.,499 Castle Peak Road,Lai Chi Kok, KowloonPhone (852) 2 793 0218Telefax (852) 2 763 5236E-mail: hameghk@netvigator.com
United States of America
HAMEG, Inc.266 East Meadow AvenueEAST MEADOW, NY 11554Phone (516) 794 4080Toll-free (800) 247 1241Telefax (516) 794 1855E-mail: hamegny@aol.com
Great Britain
HAMEG LTD74-78 Collingdon StreetLUTON Bedfordshire LU1 1RXPhone (01582)413174Telefax (01582)456416E-mail: sales@hameg.co.uk
Spain
HAMEG S.L.Villarroel 172-17408036 BARCELONATeléf. (93) 4301597Telefax (93) 321220E-mail: email@hameg.es
France
HAMEG S.a.r.l5-9, av. de la République94800-VILLEJUIFTél. (1) 4677 8151Telefax (1) 4726 3544E-mail: hamegcom@magic.fr
Germany
HAMEG GmbHIndustriestraße 663533 MainhausenTel. (06182) 8909 - 0Telefax (06182) 8909 - 30E-mail: sales@hameg.de
HAMEG ServiceKelsterbacher Str. 15-1960528 FRANKFURT am MainTel. (069) 67805 - 24Telefax (069) 67805 - 31E-mail: service@hameg.de
Printed in Germany
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