DIGITAL MULTIMETER
OPERATION MANUAL
1. GENERAL
The instrument is a stable and high performance digital multimeter driven by
battery. It uses the LCD with 42mm high make the reading is clearly. And the
function of 20sec. back light and overload protection make operation is
convenient.
The instrument has the function of measuring DCV, ACV, DCA, ACA,
resistance, capacitance, and diode, triode and continuity test. The instrument
takes dual-integral A/D converter as key point, is an excellent tools.
2. SAFETY NOTES
This series meter meets the standard of IEC1010. Read it before operation.
1．Do not input the limited voltage of 1000V DC or 750V AC RMS when
measuring voltage.
2．Voltage less than 36V is safety voltage. When measuring voltage higher than
36V DC, 25V AC, check the connection, insulation of test leads to avoid
electric shock.
3．When changing function and range, test leads should be removed from
testing point.
4．Select correct function and range.
5．When measuring current, do not input current over 20A.
6．Safety symbols
“ ” exists high voltage
，“ ”
GND
，“ ”
dual insulation
，“
”
must refer to manual
，“ ”
low battery
3. SPECIFICATION
1．GENERAL
1-1．Displaying : LCD displaying
1-2．Max. indication: 1999（3 1/2）, auto polarity indication
1-3．Measuring method: dual slope A/D transfer
1-4．Sampling rate: approx. 3 times/sec
1-5．Over range indication: MSD displays “1” or“-1”
1-6．Low battery indication: “ ” symbol displays
1-7．Operation: 0～40℃，relative humidity <80%
1-8．Power：one 9V battery (NEDA1604/6F22 or equivalent)
1-9．Meas.:190×93.5×37 mm
1-10．Weight: approx. 426g（including battery
）
1-11. Accessories: test leads, instruction manual, holster, gift box and battery
1-12. Test accessories: alligator, triode test accessory
2．TECHNICAL DATA
2-1．Accuracy: ±（RDG% + the lowest digit） at (23±5) ,<75%RH one year℃
guarantee from production date
2-2．TECHNICAL DATA
2-2-1.DCV
RANGE ACCURACY RESOLUTION
200mV ±(0.5%+3) 100uV
2V 1mV
20V 10mV
200V 100mV
1000V ±(0.8%+10) 1V
Input resistance：all ranges: 10MΩ
Overload protection: 200mV range: 250V DC or AC peak value, other range:
1000V DC or AC peak value
2-2-2.ACV
RANGE
ACCURACY
RESOLU7TION
2V ±(0.8%+5) 1mV
20V 10mV
200V 100mV
750V ±(1.2%+10) 1V
Input resistance: 10MΩ Max
Overload protection: 1000V DC or AC peak value
Frequency response: lower than 200V range: 40~400Hz，750V range:
40~200Hz
Displaying: RMS of sine wave( mean value response)
2-2-3. DCA
RANGE ACCURACY RESOL.UTION
20uA ±(0.8%+10) 0.01uA
200uA 0.1uA
2mA 1uA
20mA 10uA
200mA ±(1.2%+8) 100uA
2A ±(1.5%+5) 1mA
20A ±(2.0%+5) 10mA
Max. measuring voltage drop: 200mV
；
Max. input current: 20A（within 10 sec.
）
Overload protection: 2A / 250V fast melt fuse, 20A infused
2-2-4. ACA
RANGE ACCURACY RESOLUTION
20mA ±(1.0%+5) 10uA
200mA ±(2.0%+5) 100uA
2A ±(3.0%+5) 1mA
20A ±(3.0%+10) 10mA
Max. measuring voltage drop:200mV
Max. input current: 20A （less than 10sec.
）
Overload protection: 2A / 250V fast melt fused, 20A range infused
Frequency response: 40~200Hz
；
Displaying: rms of sine wave(mean value response
）
2-2-5. RESISTANCE（Ω
）
RANGE ACCURACY RESOLUTION
200Ω ±(0.8%+5) 0.1Ω
2kΩ ±(0.8%+3) 1Ω
20kΩ 10Ω
200kΩ 100Ω
2MΩ 1kΩ
200MΩ ±[5%(rdg –10 )+ 30] 100kΩ
Open voltage: less than 3V
Overload protection: 250V DC or AC peak value
NOTE: a：At 200Ω range, it should make the test leads short to measure the
wire resistance, then, subtracts from the real measurement.
b：At 200 MΩ range, make the test leads short, LCD displays 1.0MΩ, it’s
normal and has no effect on the accuracy and should be subtracted from
real measurement.
2-2-6. CAPACITANCE
RANGE ACCURACY RESOLUTION
200uF ±(5.0%+10) 100nF
Overload protection: 36V DC or AC peak value
2-2-7. DIODE AND CONTINUITY TEST
RANGE DISPLAYING VALUE TEST CONDITION
Forward voltage drop
of diode
Forward DCA is approx.
1mA，backward voltage is
approx. 3V
If the resistance
is less than 70Ω±20Ω,
buzzer sounds
Open voltage is approx. 3V
Overload protection: 250V DC or AC peak value.
Warning: do not input voltage at this range!
2-2-8. TRANSISTOR h
FE DATA TEST
RANGE DISPLAYING RANGE TESTING CONDITION
hFE NPN or PNP
0 ~ 1000
Basic current is approx.
10uA
，
Vce is
approx. 3V
2-2-9. Live wire identifying
RANGE DISPLAYING ALARM TEST
CONDITION
TEST 000 or 1 Sound, light AC standard live
wire verify
Overload protection: 500V DC or AC peak value.
Warning: for your safety, please operate according to the safety rule.
4. OPERATION
4-1．PANEL DESCRIPTION
1．LCD: display the measuring value and unit.
2-1．POWER switch: turn on/off the power.
2-2．B/L key: turn on/off back light, will be auto off after 2 sec.
2-3: Transistor test jack.
2-4．HOLD key: press it, the present value is held on LCD and “ HOLD ”
symbol displays. Press it again, “ HOLD ” symbol disappears, and the meter
exists the hold mode.
2-5．Live wire verify light
3．Range knob: to select measuring function and range.
4．VOLTAGE, RESISTANCE AND FREQUENCY COM
5．GND, ANODE SOCKET OF TEST ACCESSORY
6．LESS THAN 200mA CURRENT COM, CATHODE SOCKET OF TEST
ACCESSORY
7．20A CURRENT COM
SEE THE FIG:
4-2．DCV MEASUREMENT
1．Apply the black test lead to “COM” terminal and the red one to V/Ω/Hz
terminal.
2．Set the knob to a
proper DCV range, connect the black test lead crossly to the circuit under
tested, the voltage and polarity of the point which the red lead connect to
will display on LCD.
NOTE:
1
．
If the voltage range is unknown beforehand, set the knob to the highest
range, then, select a proper range according to the displaying value.
2．There is a remained value at small voltage range before measuring, it is
normal and have no effect on measurement. If MSD displays “1”, it means
over range, should set the knob to a higher range.
3．Do not input a voltage over 1000V, or, the circuit might be damaged.
4．Be careful when measuring high voltage circuit.
4-3．ACV MEASUREMENT
1．Apply the black test lead to “COM” terminal and the red one to V/Ω/Hz
terminal.
2．Set the knob to proper ACV range, connect the test leads crossly to the
circuit under tested.
NOTE:
1
．
If the voltage under tested is unknown beforehand, set the knob to the
highest range, then, select a proper range according to the displaying value.
2
．
There is a remained value at small voltage range before measuring, it is
normal and have no effect on measurement. If MSD displays “1” , it means
over range, should set the knob to a higher range.
3．Do not input voltage over 750Vrms，or, the circuit might be damaged.
4．Be careful when measuring high volt circuit.
4-4．DCA MEASUREMENT
1
．
Apply the black test lead to “COM” terminal, and the red one to mA
terminal (max. 200mA), or red test lead to “20A” terminal（max. 20A）.
2． Set the knob to proper DCA range, connect the meter to the circuit under
tested, the current value and polarity of red test lead connect to will display
on LCD.
NOTE:
1
．
If the current under tested is unknown beforehand, set the knob to the
highest range, then, select proper range according to the displaying value.
2． If LCD displays“1”, it means over range, should set the knob to a higher
range.
3
．
Max. input current is 200mA or 20A（subject to where the rd test lead
apply to）, too large current will blow the fuse. Be careful at 20A, because
20A is infused, continuously measuring will make the circuit heat and
effect on the accuracy even damaged the meter.
4-5．ACA MEASUREMENT
1
．
Apply the black test lead to “COM” terminal and the red one to“mA”
terminal（max. 200mA
） ，
or apply the red one to “20A”
terminal（max. 20A）.
2． Set the knob to proper ACA range, connect the meter to the circuit under
tested.
NOTE:
1
．
I f the current under tested is unknown beforehand, set the knob to the
highest range, then, select proper range according to the displaying value.
2． If LCD displays“1”, it means over range, should set the knob to a higher
range.
3． Max. input current is 200mA or 20A（subject to where the red test lead
apply to）, too large current will blow the fuse. Be careful at 20A, because
20A is infused, continuously measuring will make the circuit heat and
effect on the accuracy even damaged the meter.
4-6．RESISTANCE MEASUREMENT
1
．
Apply the black test lead to “COM” terminal and the red one to V/Ω/Hz
terminal.
2．Set the knob to proper resistance range; connect test leads crossly to the
resistor under tested.
NOTE:
1．If resistance is over selected range value, “1” displays, should set the knob
to a higher range. When measuring value is over 1MΩ, the reading will take
a few seconds to be stable, it’s normal for high resistance measuring.
2．When input terminal is in open circuit, overload displays.
3．When measuring in line resistor, be sure that power is turned off and all
capacitors are released completely.
4．Do not input any volt at this range.
NOTE: a：At 200Ω range, it should make the test leads short to measure the
wire resistance, then, subtracts from the real measurement.
b：At 200 MΩ range, make the test leads short, LCD displays 1.0MΩ, it’s
normal and has no effect on the accuracy and should be subtracted from real
measurement.
4-7．CAPACITANCE MEASUREMENT
1. Set the knob to proper capacitance range, and insert the test accessory to
“COM” and “mA” terminal. Be aware of that “COM” terminal corresponds
to anode and connects with red test lead, and “mA” terminal corresponds to
cathode and connects with black test lead.
2．Connect test leads to the two points of capacitor, be ware of polarity if
necessary.
NOTE:
1．If the capacitance under tested is over the max. value of selected range, LCD
displays “1” only, thus, should set the knob to a higher range.
2．It’s normal that there is a remained value on LCD before capacitance
measurement, and it has no effect on measuring.
3．When measuring at large capacitance range, if capacitor is broken or
leakage, LCD displays a value and it’s unstable.
4．Release the capacitor completely before measuring.
4-8．TRANSISTOR hFE
1．Set the knob to hFE range. Insert the test accessory to COM and mA
terminal, and the anode is corresponding to COM and cathode is
corresponding to mA terminal.
2. Verify the transistor under tested is NPN or PNP, insert emitter, base and
collector to proper jack.
4-9．DIODE AND CONTINUITY TEST
1．Apply the black test lead to “COM” terminal and the red one to V/Ω/Hz
terminal（the polarity of red lead is “+”）.
2．Set the knob to range, connect test leads to the diode under tested,
the red test lead connects to diode positive polarity, the reading is the
approx. value of diode forward volt drop.
Apply test leads to two points of tested circuit, if the inner buzzer sounds, the
resistance is less than (70±20)Ω.
4-10．DATA HOLD
Press down the key, the present value is held on LCD, press up the key and the
function is cancelled.
4-11．AUTO POWER OFF
After stop working for 20±10 minutes, the meter will be into sleep mode. Press
“POWER” key twice to restart the power.
4-12．BACKLIGHT INDICATION
Press “B/L” key to turn on the backlight, will be auto off after 20 sec.
NOTE: When turning on backlight, the working current will be enlarged; it will
shorten the battery life, and enlarge error on some functions.
4-13. LIVE WIRE VERIFY
1. Remove black test lead from “COM” terminal, insert red lead to “V/Ω/Hz”
terminal.
2. Set the range knob to TEST range, apply red lead to the circuit under
tested.
3. If LCD displays “1”, and alarms with sound and light, it means that the
circuit under tested is live wire; if LCD doesn’t display “1” and doesn’t alarm, it
means the circuit under tested is “0” wire.
NOTE:
1. The function is only for testing AC standard live wire (AC 110V~AC
380V).
2. Must be operated under safety rules.
5. MAINTANENCE
Do not try to modify the circuit.
1. Keep the meter away from water, dust and shock.
2. Do not store and operate the meter under the condition of high temperature,
high humidity, combustible, explosive and strong magnetic place.
3. Wipe the case with a damp cloth and detergent, do not use abrasives and
alcohol.
4. If do not operate for a long time, should take out the battery to avoid leakage.
4-1. When signal displays, should replace the battery following the steps:
4-1-1. Unlock the button and remove the battery case.
4-1-2. Take out the old battery and replace the new one. It's better to use alkaline
battery for longer life.
4-1-3. Fit on the battery case and lock the button.
4-2. Fuse replacement
Use the same type fuse as specified.
If the meter does not work properly, check the meter as following:
CONDITIONS WAY TO SOLVE
NO DISPLAYING ●The power is not turned on
●HOLD key
●replace battery
symbol displays ●replace battery
NO CURRENT INPUT ●replace fuse
BIG ERROR ●replace battery
●
The specifications are subject to change without notice.
●
The content of this manual is regarded as correct, error or omits Pls.
contact with factory.
●
We hereby will not be responsible for the accident and damage caused by
improper operation.
●
The function stated for this User Manual cannot be the reason of special
usage.
MB-9801-50
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