User’s manual for VC99 3 6/7 DMM
1.SUMMARY
This digital multimeter is a steady performance, battery-driven 3 6/7 digital multimeter.
It uses the LCD with 23mm-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, frequency, temperature, duty cycle, transistor and diode, continuity performance
test .The meter can provide functions including analog bar and unit symbol display, data
holding, relative value measuring, maximal/minimal value measuring, auto/manual range
switching (RANGE), auto power off and warning functions .it adopts double integral A/D
converter as its core. It is an ideal tool for labs, factories and radio-technology.
2.SAFTY NOTES
：
The instrument is designed according to IEC1010 standard (safety standard issued by
International Electro technical Committee). Please read the following before operation.
1-1.Check the connection and insulation of test leads to avoid electric shock.
1-2.Do not input a limited voltage higher than DC 1000V or AC 750V when measuring ranges.
1-3.When measuring voltage higher than DC 60V, AC 40V, please be careful.
1-4. Select correct function and range to avoid fault operation.
1-5.Please move the test leads away from test points when switching the function.
1-6.Please don’t input voltage value when measuring current.
1-7.Please don’t modify the circuit.
1-8.Introduction for safety symbol:
“
” exists high voltage; “
” GND “
” dual insulation “
” must refer to
manual “
” Low battery.
3. SPECIFICATION
1. General features
1-1. Displaying: LCD;
1-2.Max display: 6000(3 6/7) digits automatic polarity, unit symbol and 61 section analog
display;
1-3. Measurement method: double integral A/D conversion;
1-4. Sampling rate: approx.3 times/sec.
1-5. Over-range display: “OL” displayed in the highest digit.
1-6. Low battery display
：
“
”
1-7. Working environment: (0
～
40)
℃
, relative humidity: <80%;
1-8.Store environment: (-10
～
40)
℃
, relative humidity: <80%;
1-9.Power supply
：
2pcs 1.5V battery
（
“AAA”7# battery
）
；
1-10. Dimension: 185×93×35mm (length*width*height);
1-11. Weight: approx..290g
（
(including battery)
；
1-12.Accessories: test leads, user manual, temperature probe, holster, gift box, and 2*1.5V
battery.
2. TECHNICAL FEATURES
2-1. Accuracy: ± (a% × reading data + digits), environment temperature at (23±5)
℃
, relative
humidity<75%, One year guarantee since production date.
2-2.DC Voltage
（
DCV
）
Range
Accuracy
Resolution
600mV
±(0.5%+3)
0.1mV
6V
1mV
60V
10mV
600V
100mV
1000V
±(0.8%+3)
1V
Input impedance: approx. 10MΩ
Overload protection
：
1000V DC or 750V AC.
2-3.AC Voltage
（
ACV
）
Range
Accuracy
Resolution
6V
±(0.8%+5)
1mV
60V
10mV
600V
100mV
750V
±(1.0%+5)
1V
Input impedance: approx. 10MΩ
Overload protection
：
1000V DC or 750V AC.
Frequency response:
（
40
～
200
）
Hz under 750V ,other range:(40
～
400
）
Hz.
Sine wave RMS(Average value response).
2-4.DC Current
（
DCA
）
Range
Accuracy
Resolution
600uA
±(1.0%+3)
0.1μA
6000uA
1μA
60mA
10μA
600mA
100μA
6A
±(2.0%+5)
1mA
20A
10mA
MAX measurement voltage drop:
：
full range mA :300mV
，
A:100mV
。
Max input current: 20A (within 15 seconds)
Over load protection: 500mA/ 250V and 13A/250V
fast molten fuse.
2-5.AC Current
（
ACA
）
Range
Accuracy
Resolution
600uA
±(1.2%+5)
0.1μA
6000uA
1μA
40mA
10μA
600mA
100μA
6A
±(2.0%+15)
1mA
20A
10mA
MAX measurement voltage drop:
：
full range mA :400mV
，
A:200mV
。
Max input current: 20A (within 15 seconds)
Over load protection: 500mA/ 250V and 13A/250V
fast molten fuse.
Frequency response
：
：
20A range:40
～
100Hz,other range:40
～
400Hz
。
2-6.Resistance
（
Ω
）
Range
Accuracy
Resolution
600Ω
±(0.8%+5)
0.1Ω
6kΩ
±(0.8%+3)
1Ω
60kΩ
10Ω
600kΩ
100Ω
6MΩ
1kΩ
60MΩ
±(1.2%+5)
10kΩ
Open circuit voltage:
：
600mV
Over load protection: 250V DC or AC peak value;
NOTE:
At range 600 Ω, short-circuit the test leads to measure the wire resistance and then
subtracts it from the real measurement. Or press “”REL” to clear the wire resistance and read
the value directly.
2-7.CAPACITANCE
（
C
）
RANGE
ACCURACY
RESOLUTION
40nF
±(2.5%+6)
10pF
400nF
±(2.5%+5)
100pF
4μF
1nF
40μF
10nF
400μF
±(5.0%+8)
100nF
2000μF
1uF
Overload protection :250V DC or AC peak value.
