Table of Content

Safety Precautions and Procedures………………2

General Description………………………………2

Electric symbol …………………………………4

Function panel ……………………………………5

Operations Description……………………………5

Panel Description………………………………11

Technical Specifications…………………………17

Maintenance ……………………………………20

Accessories Enclosure…………………………20

1

I 、 Safety Precautions and

Procedures This serial instruments are designed according with

relevant clauses of IEC1010, before using, please read the following items carefully:

Before using, please read this " user's manual "※

carefully.

Should check and confirm there is not damage in the※ instrument, the insulating barrier of test lead is intact before using.

While holding the test lead, should pay special attention※ not to hand exceeding the plastic of the testing needle

2

root is protruding, otherwise have danger of shocking by electricity.

Before opening the back cover, must pull out the test※ lead; After closing the back cover and screwing the screw on, could carry on measurement, otherwise have danger of being shocked by electricity.

In measure course, disconnect instrument input and※

then rotate function / range switch.

never input signal electronic voltage exceeding the※

limited value to avoid electronic shock or damaging

the instrument.

the potential difference between the measurement※

public terminal COM and earth can’t exceed 1000V to

avoid electric short or damage the instrument.

pay attention if the tested voltage is over DC 60V and※

AC 42V to avoid electric shock

if there have a symbol ※ on the LCD display, it

indicates low battery. Replace the battery to ensure

measurement accuracy.

※For the fuse, it must be replaced with an identical

model if necessary.For the concrete

specification,please see the clause of maintenance or

label on the instrument board.

3

II、 General Description6500 series manual measuring-range digital

multimeter designs excellent,the appearance is novel and

natural.The large liquid crystal screen dresses up Li's

background light clearly to cause the demonstration to be

artistic.Non- contact alternating current examination

function (namely NCV examination function) can let you

be able fast to judge the object whether has the alternating

current or not in the case of not using test pencil, not using

the test lead and not contacting the object .It brings

enormous convenience for your work. This series digital

multitester includes models HD6501, 6505, 6508 (3 1/2),

6503, (4 1/2) and so on. The function is complete and it is

easy to operate. Besides the triode test and NCV

examination, all measurements are surveyed by the

multimeter lower four test inputs jack,namely use the test

lead to test.Facilitates your operation and strengthen the

security. PTC temperature sensing component is

connected within the V jack input terminus, which has

fully protected the key part of the multimeter --Function /

range switch and improved security and lengthened the

use life-span greatly.

4

Function form:Item 6501 6503 6505 6508

DC Voltage √ √ √ √AC Voltage √ √ √ √DC Current √ √ √ √AC Current √ √ √ √Resistance √ √ √ √Capacitance √ √ √Frequency √ √Temperature √

Diode√ √ √ √

Continuity√ √ √ √

NCV √ √ √ √

Backlight √ √ √ √

Data hold √ √ √ √

Power Off √ √ √ √

Technological characteristicDisplay:The large screen liquid crystal display: visual area 61*35mm, word high 27mm.Max display:1999 (3 1/2),19999 (4 1/2). Automatic polarity display, range exceeding instruction and changing the battery instruction. The beautiful background light of little consumption, go out automatically in several seconds.Measurement:Low power consumption CMOS double integration, A/D transform integrated circuit, auto zero calibrationDC basic precision:（3 1/2）、（4 1/2）。

5

Data Hold functionFull range over loading protecting functionPower Supply:Power supply: one 9V battery (NEDA1604, 6F22 type or equivalently type)Automatic shut-down function, start the machine,power off automatically in about 15 minutesExternal dimension: 182×84×36mmComplete instrument weight: about 247g (include the battery).Environment condition:Working temperature: 0~40℃the relative humidity: < 85%Store temperature: -10~50℃ The relative humidity: < 85%Guarantee the temperature of the precision:23±5℃ The relative humidity < 75%

III、Electronic Symbol

DC

AC

Diode

Buzzer

Low battery

Warning

Double insulation

High voltage

danger

IV、Function Panel

6

V、Operations instructionExamine instrument:

Before measurement, check whether the instrument and the test lead stands intact, and the low battery had electricity, push POWER button, if the battery is

7

1. LCD display2. Data Hold3. Backlight key4. 20A current input jack(current input“+”end )5. mA（2A）current input jack(current input“+”end) capacitance input jack6. Test input “COM”7．VJack(voltage,resistance,diode continuity,

temperature testing “+”end)8. Function/range switch9. NCV test indicating light10. Audion test jack11. on/off switch12.NCV test

insufficient, the symbol l“ ” exists above left of the display screen, then need to change the battery to reuse.

If the instrument is problematic,you must repair and reuse.

Operate sketch Fig. 1- Fig. 12, can help you to grasp the correct operation of the instrument. Digital serial numbers of picture indicate operate order, while reading the manual, please contrast operating instruction with operating sketch map to grasp the use of the instrument correctly.1、DC Voltage measure:

. Rotate”function/range switch” to “① V ”, choose the suitable range.

.② Insert the black test lead into the “COM” socket and the red test lead into “VΩ” socket.

Connect the test lead in parallel to both ends of voltage source examined, the instrument can point out the polarity of one end of the red test lead while revealing voltage reading.

Caution:a. When the display screen only reveals the high position

" 1 ", it proves that voltage examined has already exceeded the range.When not knowing the voltage examined, choose the max range.

b. Location " 200mV " protect maximum 250V, other voltage range is direct current 1000V (AC voltage 750V).Higher than that might damage instrument

c. Don't measure the DC voltage higher than 1000V, though may reveal reading, may damage the instrument.

d. Should especially take care while measuring the high voltage.

2、AC Voltage measurement .Rotate " function / range switch to “ V ① ~ " and choose the suitable range

. Insert the black test lead into the “COM” socket and②

8

the red test lead into “VΩ” socket.. Connect the test lead in parallel to both ends of voltage source examined.

Caution: a. See the DC voltage measurement attentive matters a,b,d. b. Location" 200mV " input max protection is 250V, other

voltage range is AC voltage 750V (DC voltage 1000V). Don't measure the AC voltage higher than 750V though may reveal reading, may damage the instrument.

3、DC Current measurement.Rotate “function/range switch”to “A① ” position,and choose the suitable range.

.② Insert the black test lead into the “COM” socket and the red test lead into “mA” socket (6501 is of 2A socket) or 20A socket.. Connect test lead in series into the electric current source examined. The instrument will point out the polarity of one end of test lead while revealing electric current reading.

Caution:a. When not knowing the electric current range that

examined, should choose the max range.b. If display screen reveals high position " 1 ", it proves

electric current examined exceeds using range. Should use higher range to replace to measure.

c. mA jack max input is 200mA,while the 2A jack of 6501 is 2A. The overload will fuse the fuse in the instrument.

d. jack 20A max input is 20A, when testing, don’t exceed 10 mins..

4，AC Current measurement:.① Rotate " function / range switch "to position " A " and choose the suitable range.

. ② Insert the black test lead into the “COM” socket and the red test lead into “mA” socket or 20A socket. Connect test lead in series into the electric current

9

source examined. Caution:See the DC current measurement attentive matters a,b,c,d.

5、Resistance measurement:.① Rotate " function / range switch "to position " " and choose the suitable range.

.② Insert the black test lead into the “COM” socket and

the red test lead into V socket (red test lead is

“+”pole of measured circuit ). Connect the test lead in

parallel to resistance examined.

Caution:

a. When test leads inconnect with resistance, instrument is

in the ultral range state,only reveal high position " 1 ".

b. When measure on-circuit resistance, remove power

from the circuit being tested and discharge all the

capacitors.

c. In location 200M, when red-black test lead short

circuit ,the screen will reveals not 0(take 1.0 for

example) and if the measuring on resistance scores

101.0. The final resistance examined result is 101.0

M -1.0=100 M .

d. Input protection maximum is 250V, higher than 250V

voltage may damage the instrument.

10

6 、 Electronic circuit continuity test:

.① Rotate " function / range switch "to position “ ”.

.② Insert the black test lead into the “COM” socket and

the red test lead into V socket. Connect test lead to

both ends of circuit to be checked.

.③ If the resistance examined between the two ends is less

than about 30 ,the instrument will send out bee's

sound of chirping as the instruction.

Caution:a. The circuit examined must be checked under cutting off

power state, the electrification of circuit will lead to an instrument judging mistake.

b. Max input protection is 250V,higher than 250V may damage the instrument..

7、Diode test:①. Rotate " function / range switch "to position “ ”.②. Insert the black test lead into the “COM” socket and

the red test lead into V socket.(The circuit measured is "+ " pole), Connect test lead to both ends of diode to be checked ,the instrument indicates forward voltage drop of diode,units is volt:when the diode is reverse connected,the instrument indicates exceeding the range.

Caution：a. When test leads inconnect with resistance, instrument is

in the ultral range state(only reveal high position " 1 ").b. The electric current passed through the instrument

examined is about 1mA.c. Max input protection is 250V, higher than 250V may

damage the instrument.8、Non Contact Voltage test：

11

. Function/range switch can carry though in any① position.

.NCV test no need to use test lead.②

.③ Press NCV test key-press, the liquid crystal display of the instrument stops revealing, give out very brief “ tick ” sound. NCV indicator lamp glittering at the same time, which indicate instrument enter NCV measure state already.

. Long press NCV test key-press without loose,and④ approach object to be tested by the top part of the instrument.If the object to be tested is of 60V—1000V AC voltage,the instrument gives out indication sound and NCV indication light.

Caution:a. If loose,the NCV key-press will bounce

automatically,the instrument quit NCV measureing state.

b. The instrument keeps auto power off state after quit NCV measuring state.If carry on other measurement,twice press key-press of power supply on-off switch.

9、Capacitance measurement.① Rotate " function / range switch "to position “F” and choose the suitable range.

. ② Insert the black test lead into the “COM” socket and the red test lead into CAP socket. Connect the test lead in parallel to both ends of the capacitance examined.

Caution:a. Should discharge the capacitance filling with the

electricity, then carry on measurementb. Should avoid examining the voltage by mistake,

otherwise may damage the instrumentc. Units: 1pF=10-6μF; 1nF=10-3μF.10、Frequency measurment①、Rotate " function / range switch "to position "Hz"

12

②、Insert the black test lead into the “COM” socket and the red test lead into V socket.. Connect the test lead in parallel to both ends of signal source examined.

Caution:a. The extent of the frequency signal should be controlled

between hundreds of millivolts and dozens of volts;when the singal is strong,should use the exterior attenuator; in yawp environment, can use shield cable on weak signal measurement. The voltage is higher than 100V, though can obtain reading, may exceed the error.

b. max input protection is 250V, higher than 250V may damage the instrument.

11、Temperature measurementRotate " function / range switch "to position "℃",

insert the black plug of the electric thermocouple into COM socket of the instrument,red plug into V socket of the instrument; Thermocouple measure terminal is located at temperature measure terminal.read the temperature value on the instrument display screen, the reading is . ℃Caution:a. After inserting thermocouple into the temperature

survey socket,it reveals temperature examined automatically； If not or when open circuit in electric thermocouple, it reveals the ambient temperature.

b.Simple-fixed K-type thermocouple, measure temperature limit 250℃ (short time measure is 300℃ ).

c. Max input protection is 250V, higher than 250V may damage the instrument.

12、hFE test①、Rotate "function/range switch" to "hFE" position.②、hFE specification test do not need test lead.③、Confirm the hFE is PNP or NPN type first,then insert

E、 B、 C pins to the meter’s jack.④、The meter shows hFE approx value,test condition:base

polarity’s current is approx 10uA,Vce approx 2.8V.

13

13、Data hold functionPress data hold key,display screen reveal “H” symbol

when the measuring data is locked,which is convenient for reading,recording.Press the key again, the key is reposited and the “H” symbol disappears and the instrument return to measurement states.14、Back light function:

Press the back light key and the LCD display screen give off back light,making the measured data more clear.Several seconds later the back light disappears automaticly.

VI、Panel description

1 、 DC Voltage measurement

14

2 、 AC Voltage measurement

3 、 DC Current measurement

15

4 、 AC Current measurement

16

5 、 Resistance measurement

17

6 、 Circuitry continity test

18

7 、 Diode test

19

8 、 NCV test:

20

9 、 Capacitance measurement

21

10、 Frequency measurement

22

11 、 Temperature measurement

23

12、 hFE measurement

VII、Technical specifications

24

Accuracy: (reading+word count) guarantee: one yearEnvironment temperature: 23℃℃Relative humidity: < 75%

1.DC Voltage

range

Accuracy

resolution

Accuracy

resolution65

01

650

5

650

86503

200m

V

（

）

μV

（

）

μV

2V 1mVμ

V

20V 10mV 1mV

200V100m

V10mV

1000V （

）1V

（

）

100m

V

input impedance:10 M.overload protection: range of 200mV is 250V.other range is peak value 1000V for DC Voltage or AC voltage.

2.AC Voltage

range Accuracyresolutio

n Accuracyresolutio

n

25

650165

05

6

5

0

8

6503

200m

V

（

）

—— μV —— ——

2V （

）

—

—1mV

（

）

100μ

V

20V （

）

10mV 1mV

200V 100mV 10mV

750V （

）1V

（

）

100m

V

input impedance: 10M.Frequency range: 40Hz-400Hz.Overload protection: the range of 200mV is 250V, other range is peak value 1000V for DC Voltage or AC voltage.Reveal: Average (the average of the virtual value of sine).

3.DC Current

range Accuracy resolutio Accuracy resolu

26

n tion650165

05

6

5

0

8

6503

200μA

（

）

— 100nA — —

2mA （

）

1μA

（

）

100n

A

20mA 10μA 1μA

200m

A

（

）100μA

（

）

10μA

2A

（

）

— 1 mA — —

27

20A （ ） 10mA

（

）

1mA

Voltage drop measurement:full-scale voltage drop:200mVOverload protection: below range 2A/250V fuse(HD6501 only),0.2A/250V fuse(besides HD6501) 4. AC Current

range

Accuracy

resoluti

on

Accuracy

resolu

tion650165

05

6

5

0

8

6503

200μA（

）— 100nA — —

2mA （

）

1μA

（

）

100n

A

20mA 10μA 1μA

200m

A

（

）100μA

（

）

10μA

28

2A

（

）

— 1mA — —

20A （

）10mA

（

）

1mA

Overload protection: below range 2A/250V fuse(HD6501 only),0.2A/250V fuse(besides HD6501) Voltage drop measurement:full-scale voltage drop:200mVfrequency range: 40Hz-400HzReveal: Average (the average of the virtual value of sine).5、Resistance

range

Accuracyresoluti

on

Accuracy

resolution650

1

650

5

650

86503

200

（ ）

0.1 （ ） 0.012k 1

（ ）

0.120 k 10 1200 k 100 102M 1k 100

20M （ ） 10 k （ ） 1k200M — （ ） 100 k — —

measure voltage output: ＜1V（ position 200M approx2.8V）.Caution:in position 200M, test lead short circuit and reveal number 10(more or less) after point. Subtract the number on LCD before testing from reading, you get the final result.

29

input protection:max 250V.6.Capacitance

range

Accuracyresoluti

on

Accuracy

resolution6505 6508 6503

2nF（ ）

1pF（ ）

0.1pF200nF 100pF 10pF2μF 1nF 100pF

200μF （ ） 100nF （ ） 10nF

30

measure voltage output:approx 40mVMeasure voltage frequency:approx 400Hz7.Frequency

rangeAccuracy

resolutionAccuracy

resolution6508 6503

2kHz （ ） 1Hz —— ——200kHz （ ） 100 Hz （ ） 10 Hz

input sensitivity:position 2kHz is 250mV,position 200kHz is 1.2V.Input signal range:150mV-100V.input protection:max 250V.8、Temperature

rangeAccuracy

resolution6508

-40 ~400℃ ℃ （ ） 1℃400℃~1000℃ （ ） 1℃

Temperature sensor:K-type thermocouple nickel chrome—nickel aluminium(EU-2)Open circuit characteristic:display environmental temperature.input protection:max 250V9、Diode test and circuit continuity test

rang

e

instruction test condition

indicate forward voltage drop of diode

forward current is approx 1mAReverse circuit voltage is approx 2.8V

the buzzer will beep when conductance resistance approx<30

Open circuit voltage is approx 2.8V

input protection: Max 250V.10、hFE test

rang

e

instruction test condition

hFECan measure NPN orPNP typed hFE specifications,display range:0~2000～～

Ib approx 10μA,Vce approx 2.8V

31

VIII、Maintenance Your digital multimeter is an accurate electronic instrument, should pay attention to safeguarding and maintaining1. Don't connect voltage higher than 1000V DC voltage or

750V AC voltage. 2. Don’t operate it if the back-cover is not closed properly.3. When upper left side display symbol, it indicates low

power.You need replace the battery after unfix the test lead;open the back cover then replace with battery with the same specification.

4. When replace the fuse,unfix the test lead.Unscrew the back-cover bolt to open the back-cover.Replace with fuse with same specification and screw on the bolt to close the back-cover.

5. The specification of the fuse: 6501fuse:2A/250V, other model multimeters :200mA/250V.

6. Remove the battery and put it in a dry, ventilating and few dust place if the instrument is not used for a long time..

7. Do not change the internal circuit at will to avoid damage.

IX、Accessories Enclosure1. user’s manual2. one pair of test lead3. Simple-fixed K-type thermocouple(6508 only)

32