DIGITAL MULTIMETER
OPERATION MANUAL
1. GENERAL
This digital multimeter is a steady performance, battery-driven 4 1/2
digital multimeter. It uses the LCD with 28mm high figure to make the reading
clear and make operation more convenient.
The digital multimeter has the function of measuring DCV, ACV, DCA, ACA,
resistance, capacitance, transistor and diode, and conti nuity performance test,
etc. The meter can provide functions including unit symbol display, data
holding, It adopts double integral A/D converter as its core. It is an ideal
tool for labs, factories and radio-technology.
2. SAFETY
The instrument is designed according to IEC1010 stan dard (safety standard
issued by International Electro technical Committee). Please read the safety
note before operation.
2-1. Do not input a limi ted voltage higher than DC 1000V or AC 750V when
measuring ranges.
2-2. The voltage below 36V is safety. To avoid electric shock, check whether
the test leads are connected correctly, whether the insulation is good when
measuring over 36DCV or 25ACV.
2-3. The test leads should be removed from the testing point when changing
function and range.
2-4. Choose correct function and range to avoid wrong operation.
2-5. Do not input current higher than 20A when measuring current.
2-6. Specification of safety signal
“
” existing dangerous volt “ ” GND “ ”dual insulation
“
” operator must refer to the manual “ ”low battery indication
3. SPECIFICATION
3-1．GENERAL
3-1-1. Displaying: LCD display
3-1-2. Max. displaying：19999（4 1/2）auto-polarity display
3-1-3. Measuring method：dual-slope A/D transfer
3-1-4. Sampling rate：approx. 3 times/sec
3-1-5. Over-range display: “1” or “-1”displayed in the highest digit.
3-1-6. Low battery display：“
” displays
3-1-7. Operation ：(0～40)℃，relative humidity <80% R.H
3-1-8. power: 9V battery (NEDA1604/6F22 or equivalent)
3-1-9. Dimension: 185mm×93mm×35 mm
3-1-10. Weight: approx. 290g (including battery)
3-1-11. Accessories: user manual, test leads, holster, gift box, and 1*9V
battery.
3-2．TECHNICAL SPECIFICATION
3-2-1. Accuracy: ±（a% × reading＋digits）at 23 ± 5℃，<75% R.H，one year
guarantee from production time.
3-2-2.DCV
Range Accuracy Resolution
200mV 10uV
2V 100uV
20V 1mV
200V
±(0.1%+5)
10mV
1000V ±(0.2%+5) 100mV
Input impedance：10MΩ at all ranges
Over-range protection：250 DCV or AC peak value at 200mV range,
1000 DCV or DC peak value at other range
3-2-2.AC
Range Accuracy Resolution
2V 100uV
20V 1mV
200V
±(0.8%+25)
10mV
750V ±(1.0%+25) 100mV
Input impedance：10MΩ at all ranges
Over-range protection：1000 DCV or DC peak value at other range
Frequency response：below 200V：40~400Hz，750Vrange:40~200Hz
Displaying：sine wave RMS（mean value response ）
3-2-3.DCA
Range Accuracy Resolution
200uA 0.01uA
2mA 0.1uA
20mA
±(0.5%+4)
1uA
200mA ±(0.8%+6) 10uA
20A ±(2.0%+15) 1mA
Max. measuring volt drop: 200mV
Max. input current: 20A（less than10 seconds）
Overload protection: 0.2A / 250V fast blow fuse; 20A range without fuse.
3-2-4.ACA
Range Accuracy Resolution
200mA ±(1.5%+25) 10uA
20A ±(2.5%+35) 1mA
Max. measuring volt drop：200mV
Max. input current：20A（less than 10 seconds）
Overload protection： 0.2A / 250V with fuse，20A range without fuse.
Frequency response：40~200Hz
Displaying：sine wave RMS（mean value response）
3-2-5. RESISTANCE（Ω）
Range Accuracy Resolution
200Ω ±(0.2%+10) 0.01Ω
2kΩ 0.1Ω
20kΩ 1Ω
200kΩ 10Ω
2MΩ
±(0.2%+5)
100Ω
20MΩ ±(0.8%+15) 1kΩ
Open circuit voltage：less than 3V;
Overload protection：250DCV or ACV peak value;
Note:
In 200Ω range ， should make the test leads short, and measure the
resistance of the wire, then, subtracts from the actual measuring value.
3-2-6. Conductance（resistance range:10,000MΩ-10MΩ）
Range Accuracy Resolution
(0.1-100)nS ±(1.0+5) nS
Open circuit voltage：less than 3V;
3-2-7.CAPACITANCE
Range Accuracy
Resolutio
20nF 1pF
2uF
±(3.5%+10)
100pF
200uF ±(3.8%+20) 10nF
Testing frequency: 400Hz;
Overload protection：36 DCV or ACV peak value.
3-2-8.FREQUENCY
Range Accuracy
Resolutio
2kHz 0.1Hz
200kHz
±(3.0%+15)
10Hz
Input sensitivity：1V RMS;
Overload protection：250V DC or AC peak value (less than 10sec.).
3-2-9.DIODE AND CONTINUITY TEST
RANGE DISPLAYING VALUE TEST CONDITION
Diode forward volt drop
Forward DC current is
approx. 1mA ， backward
voltage is approx. 3V
Buzzer rings, the impedance
between the two testing points
is less than(30±10)Ω
Open voltage is approx.
3V
Overload protection：250DCV or ACV peak value;
Warning: do not input any voltage value at this range for safety!
3-2-10. hFE
Range Scope Testing condition
hFE NPN or PNP 0~1000
Base DC current is a pprox.
10uA，V
ce
is approx. 3V
4.OPERATION
4-1．Front panel
①. LCD: display the measured value;
②Function key;
②-1. Power switch: turn on or off the power
②-2. HOLD key: press the key dow n, the measured value
will be hold and “HOLD” signal appears; press it
down again,“ HOLD ”signal disappears and out of
the HOLD mode.
②. Backlight;
③．hFE testing terminal：for measuring transistor
hFE;
④． Knob switch: f or changing function and range ;
⑤．Terminal for capacitance;
⑥．Terminal for Voltage, resistance, frequency and GND testing;
⑦．Battery case;
4-2．DCV measurement
4-2-1. Apply th e bla ck test leads to “COM” terminal and the red one to V/Ω/Hz
terminal.
4-2-2. Switch the knob to a proper DCV range, then, connect the test leads cross
the measured circuit, the voltage and polarity of the point which connected
with the red test lead will be displayed.
NOTE:
1. If the voltage under measured is unclear beforehand, should set the range
knob to the highest range, then, switch to a proper range according to the
displaying value.．
2. The remained digits do not affect on measuring accuracy when we haven’t
measure the low voltage. If LCD displays“1”， it means over-range, the range
knob must be switched to a higher range.
2. Do not input a voltage over 1000V, or the meter might be damaged.
3. Be careful when measuring high voltage circuit.
4-3．ACV measurement
4-3-1. Apply th e bla ck test leads to “COM” terminal and the red one to V/Ω/Hz
terminal.
4-3-2. Set the range knob to a proper ACV range, and then connect the test l eads
cross to the measured circuit.
NOTE:
1. If the range under measured is unclear beforehand, should set the range knob
to the highest range, then, switch to a proper range according to displaying
value.．
2. The remained digits do not affect on measuring accuracy when we haven’t
measure the low voltage. If LCD displays “1”, it means over-range, should
set the range knob to a higher range.
3. Do not input a voltage over 750Vrms, or, the meter might be damaged.
4. Be careful when measuring high voltage circuit.
4-4. DC current measurement
4-4-1. Apply the black test leads to “COM” terminal and the red one to “mA”
terminal (Max.200mA), or the red test lead to “20A”terminal (max. 20A)
4-4-2. Set the range knob to a proper DCA current range, then, connect the meter
to the measured circuit, the measured current value and the current polarity
which the red test lead connect will be displayed on LCD.
NOTE:
1. If the range under measured is unknown beforehand, should set the range knob
to the highest range, then, switch to a proper range according to the displaying
value;
2. If LCD displays“1”，it means over-range, the range knob must be set to
a higher range.
3. The max. input current is 200mA or 20A (subject to the position where the
red test lead insert), large current may blow the fuse. Be careful especially
at 20A range, because there is no fuse protection at this range, large current
may heat the circuit, even damage the meter.
4-5．AC current measurement
4-5-1. Apply the black test lead to "COM” terminal，and the red one to "mA”
terminal (max. 200mA), or the red test lead to “20A”terminal (max. 20A);
4-5-2. Set the range knob to a proper AC current range, then, connect the meter
to the circuit under measured.
NOTE:
1. If the current range under measure is unknown beforehand, should set the
range knob to the highest range, then, switch to the proper range according
to the displaying value.
2. If LCD displays“ 1”，it means over-range, must set the range knob to a higher
range.
3. The max. input current is 200mA or 20A（subject to the position where the
red test lead insert），large current might blow the fuse，be caref ul especially
at 20A range, because there is no fuse protection at this range, large current
may heat the circuit, even damage the meter.
4-6．Resistance measurement
4-6-1. Apply the black test lead to COM terminal，and the red one to V/Ω/Hz
terminal.
4-6-2. Set the range knob to a proper resistance range, connect the test leads
across the resistance under measured.
NOTE:
1. If the resistance value is o ver the selected range value, "1" displays, thus,
should set to a higher range. When measuring value is over 1MΩ，the reading
needs a few seconds to be stable. It's normal for high resistance measuring.
2. When input terminal is open-circuit, overload displays.
3. Before measurin g in-line resistance, be sure that power is off and all
capacitance are released.
4. If big error appears, perhaps it was affected by other elements or there
existed voltage on the resistance.
5. Do not input voltage at this range.
4-7．Conductance measurement
4-7-1．Apply the black test leads to “mA” terminal , and the red one to “V/
Ω/Hz” terminal.
4-7-2．Set the range knob to nS range, connect the test leads to the insulating
resistance under measured.
NOTE:
1．When without input, such as open-circuit, LCD displays“000.0”。
2．If the reading of conductance is over 100.0nS，set the range knob to resistance
range and measure, but must apply the black test lead to “COM” terminal.
4-8．Capacitance measurement
Set the knob to prop er capacitance range, and insert the capacitor under tested.
NOTE:
1. If "1" displays, it means over-range, should set to a higher range.
2. The remained digits do not affect on measuring accuracy before measuring;
3. If creeps seriously or the capacitor is breakdown when measuring large
capacitance, some digits are displayed and unstable;
4. Please do not measure the capacitance on line;
5. Before measuring, should release the capacitor completely to avoid damage.
4-9．Frequency measurement
4-9-1．Apply the test leads or shield cable to “COM” and V/Ω/Hz terminal.
4-9-2．Switch the range knob to frequency range, connect the test leads across
to the signal source or the measured load.
NOTE:
1．When input is over 10Vrms，reading is possible but maybe over range.
2．It's better to use shielding cable on noisy condition when measuri ng small
signal.
3．Be careful when measuring high volt circuit.
4．Do not input a voltage over 250DCV or AC peak value to avoid damage the m eter.
4-10. Transistor hFE
4-10-1. Set the range to hFE range.
4-10-2. Select NPN or PNP , insert separately emitter, base and collector to
proper terminal.
4-11．Diode and continuity test
4-11-1．Apply the black test lead to “COM” terminal，and the red one to V/Ω/H z
terminal（the polarity of the red test lead is “+”）.
4-11-2．Set the range knob to
，connect the test leads to the diode under
measured, and the reading is close to the value of diode forward voltage drop.
4-10-3. Backward measuring: the red test connect to diode cathode polarity,
the black test leads to diode positive polarity ,the LCD display “OL”;
4-11-4. The complete diode testing inc lude forward and backward measurement,
if the result isn’t meet the above, it means the diode is bad.
4-11-5．Connect the test leads to two points of circuit under measured, if the
built-in buzzer sounds, the resistance between two points is less than approx.
(30±10)Ω.
NOTE: Do not input voltage at”
” range to avoid damage the meter.
4-12．DATA HOLD
PRESS “HOLD” key, the current data will be hold on LCD, press it again this
function will cancelled.
4-13. Auto power off
When the meter stopped to use for（20±10）minutes later，it will be auto power
off and inter the state of dormancy. Press “POWER” key for twice, it will
turn on again.
4-14. Backlight
Press “B/L”key, the backlight will light, it will go out after 10 sec. If
you need it press it again.
5．MAINTENANCE
Do not try to modify the electric circuit.
5-1. Don’t input the voltage value higher than DC 1000V or AC 750V;
5-2. Don’t measuring the voltage at resistance rage;
5-3. Don’t use the meter when the battery isn’t install or the back case
isn’t firm.
5-4. When replacing fuse, please take away the test leads from the measuring
point and power off at first.
5-5. Keep the meter away from water, dust and shock.
5-6. Do not store and operate t he meter under the condition of high temperature,
high humidity, combustible, explosive and strong magnetic place.
5-7. Wipe the case with a damp cloth and detergent; do not use abrasives and
alcohol.
5-8. If do not operate for a long time, should take out the battery to avoid
leakage.
5-9. When”
” symbol displays, should replace the battery following the
steps:
5-9-1. see picture 2, move holster at first.
5-9-2.Unlock the button and remove the battery case;
5-9-3. Take out the old battery and replace the new one. It's better to use
alkaline battery for longer life.
5-9-4.fit on battery case and bolt.
5-9-5. see the picture to f it on the holster.
5-10.fuse change: When replacing fuse, please
change another same type and specification
fuse.
6. 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 re garded as correct , er ror 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.
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