Oscilloscope HM 305 - SKY Messtechnik · Instruments Oscilloscope HM 305 ENGLISH 4S-0305-00E0 01 SEP 1996 SERVICE-MANUAL HM305

®

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


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


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

AL1

MO

NO

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Y- Intermediate Amplifier CHI + CHII, Channel Switch + Chopper Generator,Analog/ digital Switch, TRIG. and X- Signal Amplifier


Trigger Amplifier, Trigger Coupling,TV Sync. Separator,Peak Value Detection, Trigger Comparator


Timebase Sweep & Hold off Generator


Component Tester, Calibrator


Timebase, Trigger Logic


XY- Amplifier, YF- Amplifier, Overscan Circuit


Front/ Controlboard


CRT- Circuit, Unblanking, CRT- Board


Power Supply

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87

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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


Driver Stage (A/D)


A/D Converter, Address Counter, RAM'S, Timebase (Digital), Control Logic


Display- Control, Address Counter, RAM, Control Logic, HAMEG Bus Driver


Y D/A Converter, Dot Join, Y- Analog Output Driver


+5V Analog Power Supply, IC Power Supply


YPA Board (Topside)


R

[27.3;8.3]

YPA Board (Bottomside)


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


Digital Board (Topside)


Adjustment Plan: Digital Board


Front Controlboard (Topside, Bottomside)


CRT Board (Topside, Bottomside)


XY Board (Topside)


XY Board (Bottomside)


TB Board (Topside)


TB Board (Bottomside)


CCT Board (Topside, Bottomside)


AdjustmentProcedure


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.


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


Ω

3

21

PS-Board Front panel

6

7 YPA-Board

45 8 Pin 2 Pin 4

XY-BoardPS-Board


(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.


10

127 11 9

8

YPA-Board

PS-Board


(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.


(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


(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.


A C D B

24

B D C A

23

C D A B

21

XY-Board

YPA-Board


(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


ABA B

2728

25A

26 25B

XY-Board

Digi-Board


(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.


29

B C A D32

31A

B A

Pin 5Pin 1

30

31B

TB-Board XY-Board

YPA-Board TB-Board


(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.


34 33

36

38 35 37YPA-Board XY-Board

TB-Board


(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.


40

39A

39B

Pin 14Pin 1

XY-Board

CT-Board


(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.


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.


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: [email protected]

United States of America

HAMEG, Inc.266 East Meadow AvenueEAST MEADOW, NY 11554Phone (516) 794 4080Toll-free (800) 247 1241Telefax (516) 794 1855E-mail: [email protected]

Great Britain

HAMEG LTD74-78 Collingdon StreetLUTON Bedfordshire LU1 1RXPhone (01582)413174Telefax (01582)456416E-mail: [email protected]

Spain

HAMEG S.L.Villarroel 172-17408036 BARCELONATeléf. (93) 4301597Telefax (93) 321220E-mail: [email protected]

France

HAMEG S.a.r.l5-9, av. de la République94800-VILLEJUIFTél. (1) 4677 8151Telefax (1) 4726 3544E-mail: [email protected]

Germany

HAMEG GmbHIndustriestraße 663533 MainhausenTel. (06182) 8909 - 0Telefax (06182) 8909 - 30E-mail: [email protected]

HAMEG ServiceKelsterbacher Str. 15-1960528 FRANKFURT am MainTel. (069) 67805 - 24Telefax (069) 67805 - 31E-mail: [email protected]

Printed in Germany

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Documents

Oscilloscope HM 305 - SKY Messtechnik · Instruments Oscilloscope HM 305 ENGLISH 4S-0305-00E0 01 SEP 1996 SERVICE-MANUAL HM305