DIGTAL MULTIMETER
Operation Manual
1. General Description
This is a 3 3/4 digital multimeter with high stablility and performance. It uses a LCD with
20mm high figure, which makes the reading clearer and the operation more convenient. It
can test DCV, ACV, DCA, ACA, resistance, capacitance, frequency, NCV, duty cycle,
temperature, diode, and continuity. This meter also designed with functions including unit
symbol display, data hold, lighting, auto range, auto power off and warning functions. To
assure high accuracy and resolution, it adopts integrated circuit 8-bit microprocessor and a
dual integral A/D conversion as LCD driver, giving high resolution and high accuracy. It is
an ideal tool for labs, factories and radio-technology.
2. Safety Instructions
The instrument VC97A is designed in compliance with IEC1010 standard (safety standard
issued by International Electro technical Committee). Please read the following safety
instructions before operation.
2.1 Check the connection and insulation of test leads to avoid electric shock.
2.2 To avoid electric shock and damage to the meter, do not input voltage exceeding rated
value.
2.3 When measuring voltage higher than DC 60V or AC 40V, please be careful and avoid
electric shock.
2.4 Select correct function and range to avoid wrong operation.
2.5 Move the test leads away from test points when switching to other function.
2.6 Don’t input voltage in current terminal.
2.7 Don’t make any modification to the circuit. It may damage the meter or jeopardize
safety.
2.8 Safety symbols:
“ ” High voltage, “ ” GND, “ ” Dual insulation, “ ” Refer to manual, “ ” Low
battery indication.
3. Features
3.1 General Characteristics
3.1.1 Display: LCD;
3.1.2 Max display: 4000 (3 3/4 digits, automatic polarity, and unit symbol display);
3.1.3 Measurement method: Analog to digital converter (in micro processor ADC+MCU);
3.1.4 Sampling rate: approx.3 times/sec.
3.1.5 Over-range display: “OL” displayed.
3.1.6 Low battery indicator: “ ”
3.1.7 Working environment: (0～40)℃, relative humidity: <80%;
3.1.8 Store condition: (-10～50)℃, relative humidity: <80%
3.1.9 Battery: 2 pieces 1.5V battery (“AAA” 7# battery);
3.1.10 Dimension: 185×93×35mm (length x width x height);
3.1.11 Weight: approx. 290g (including battery);
3.1.12 Accessories: test leads, TP01 thermocouple, user manual, holster, gift box, and
2*1.5V batteries.
3.2 Technical Features
3.2.1 Accuracy: ± (a% × reading + digits). To assure accuracy, the ambient temperature
should be (23±5) ℃, relative humidity <75%. One year accuracy is guaranteed since
production date.
3.2.2 DC Voltage（DCV）
Range Accuracy Resolution
400mV
±(0.5%+5d)
0.1mV
4V 1mV
40V 10mV
400V 100mV
1000V ±(1.0%+5d) 1V
Input impedance: at 400mV range >40MΩ, at other ranges is 10MΩ.
Overload protection: 1000VDC or 750VAC peak value.
3.2.3. AC Voltage（ACV）(True RMS)
Range Accuracy Resolution
400mV ±(1.5%+10d) 0.1mV
4V
±(0.8%+10d)
1mV
40V 10mV
400V 100mV
750V ±(1.0%+10d) 1V
Input impedance: at 400mV range >40MΩ, at other ranges is 10MΩ.
Overload protection: 1000VDC or 750VAC peak value.
Frequency response: at 750V range: (40~1000)Hz, at other ranges: (40~2000)Hz
Displaying: True RMS response (calibration based on sine wave RMS)
3.2.4 DC Current（DCA）
Range Accuracy Resolution
400uA
±(1.0%+5)
0.1μA
4000uA 1μA
40mA 10μA
400mA 100μA
4A 1mA
20A ±(2.0%+5) 10mA
Maximum voltage drop: 400 mV for full mA range, 200 mV for full A range.
Maximum input current: 20A (within 10 seconds).
Overload protection: 0.5/250V fuse and 13A/250V fuse.
3.2.5 AC Current (ACA)
Range Accuracy Resolution
400uA
±(1.5%+10)
0.1μA
4000uA 1μA
40mA 10μA
400mA 100μA
4A 1mA
20A ±(2.0%+10) 10mA
Maximum voltage drop: 400 mV for full mA range, 200 mV for full A range.
Maximum input current: 20A (within 10 seconds).
Overload protection: 0.5/250V fuse and 13A/250V fuse.
Frequency response: at 20A range: (40~100)Hz, at other ranges: (40~400)Hz.
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