Victor VC97 Instruction Manual

DIGITAL MUL TIMETER INSTRUCTION MANUAL

1. SUMMARY

This 3 3/4 digital multimeter with highly stable performance is driven by 2 pieces 1.5V battery. It

uses a LCD with 32mm high figure, which makes the reading clearer and the operation more

convenient.

The digital multimeter holds functions of measuring DCV, ACV, DCA, ACA, resistance, capacitance,

frequency, temperature, duty cycle, transistor, diode, and continuity, etc. It also can provide special

functions including unit symbol display, data holding, relative value measuring, auto/manual range

switching (RANGE), auto power off and warning alarm. To assure high accuracy and resolution, it

adopts an 4-bit microprocessor and a dual integral A/D conversion IC as its core which can drive

LCD directly. It is an ideal tool for labs, factories and radio-technology.

2. SAFETY PRECAUTIONS

The instrument is designed according to IEC1010 standard (safety standard issued by International

Electro technical Committee). Please read the following 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 higher than DC 1000V or

AC 750V during measurement.

2.3 When measuring voltage higher than DC 60V or AC 40V, please be careful.

2.4 Select correct function and range to avoid fault operation.

2.5 Please move the test leads away from test points when switching the function.

2.6 Please don’t input voltage in current terminal.

2.7 Please don’t modify the circuit arbitrarily, it may cause safety problem.

2.8 Introduction for safety symbols:

” exists high voltage, “ ” GND, “ ” dual insulation, “ ” Operator must 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: double integral A/D conversion;

3.1.4 Sampling rate: approx.3 times/sec.

3.1.5 Over-range display: “OL” displayed in the highest digit.

3.1.6 Low battery display: “

3.1.7 Working environment: (0～40)℃, relative humidity: <80%;

3.1.8 Store condition: (-10～50)℃, relative humidity: <80%

3.1.9 Power supply: 2pcs 1.5V battery (“AAA”7# battery);

3.1.10 Dimension: 185×93×35mm (length*width*height);

3.1.11 Weight: approx. 290g (including battery);

3.1.12 Accessories: test leads, user manual, TP01 temperature probe, gift box, and 2*1.5V batteries.

3.2 Technical Features

3.2.1 Accuracy: ± (a% × reading data + digits). To assure accuracy, the environment temperature
should be (23±5) ℃, relative humidity should <75%. One year guarantee since production date.

3.2.2 DC Voltage（DCV）

Range Accuracy Resolution

400mV

4V 1 mV

”

±(0.5%+4)

0.1mV

40V 10 mV

400V 100 mV

1000V ±(1.0%+4) 1V

Input impedance: at 400mv range >40MΩ, at other ranges is 10MΩ.

Overload protection: 1000V DC or 750V AC peak value

3.2.3 AC Voltage（ACV）

Range Accuracy Resolution

400mV ±(1.5%+6) 0.1mV

4V

40V 10 mV

400V 100 mV

750V ±(1.0%+6) 1V

Input impedance: at 400mv range >40MΩ, at other ranges is 10MΩ.

Overload protection: 1000V DC or 750V AC peak value

Frequency response: at 750V range: 40~100Hz, at other ranges: 40~400Hz

Displaying: sine wave RMS (average value response)

3.2.4 DC Current（DCA）

Range Accuracy Resolution

400uA

4000uA 1μA

40mA 10μA

400mA 100μA

4A 1mA

20A ±(2.0%+5) 10mA

Maximum voltage drop: 400mV for mA range, and 200mV for A range

Maximum input current: 20A (for 15 seconds).

Over load protection: 0.5A/250V fast action fuse and 13A/250V fast action fuse.

3.2.5 AC Current（ACA）

Range Accuracy Resolution

400uA

4000uA 1μA

40mA 10μA

400mA 100μA

4A 1mA

20A ±(2.0%+10) 10mA

Maximum voltage drop: 400mV for mA range, and 200mV for A range

Maximum input current: 20A (for 15 seconds).

Over load protection: 0.5A/250V fast action fuse and 13A/250V fast action fuse.

Frequency response: 40~100Hz under 10A range, 40～400Hz at other ranges.

3.2.6 Resistance（Ω）

Range Accuracy Resolution

400Ω ±(0.8%+5) 0.1Ω

4kΩ ±(0.8%+1) 1Ω

±(0.8%+6)

±(1.0%+5)

±(1.5%+5)

1 mV

0.1μA

0.1μA

Open circuit voltage: 400mV.

Overload protection: 250V DC/AC peak value
NOTE: At 400Ω range, short the test leads first 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.

3.2.7 Capacitance（C）

Overload protection: 250V DC/AC peak value
WARNING: Do not input any voltage at this range! The capacitor must be completely

discharged before making measurement. When measuring in line capacitor, make sure the

power is cut off before testing.

3.2.8 Frequency（F）

Input sensitivity: 0.7V.

Overload protection: 250V DC/AC peak value.

3.2.9 Transistor (hFE)

Measurement Range Test conditions

hFE NPN or PNP 0~1000

3.2.10 Diode and Continuity Test

Range Description Test Conditions

40kΩ 10Ω

400kΩ 100Ω

4MΩ 1kΩ

40MΩ ±(1.2%+5) 10kΩ

Range Accuracy Resolution

4nF ±(2.5%+6) 1pF

40nF

400nF 100pF

4μF 1nF

40μF 10nF

200μF ±(5.0%+8) 100nF

Range Accuracy Resolution

10Hz

100Hz 0.01Hz

1000Hz 0.1Hz

10kHz 1Hz

100kHz 10Hz

1MHz 100Hz

30MHz 1kHz

Diode forward voltage drop

When the resistance under test is

less than 70±10Ω, buzzer sounds

±(3.5%+8)

±(0.5%+4)

Base current is approx 15uA,

10pF

0.001Hz

Vce is about 4.5V

Forward DC current is

approx 0.5mA, reverse

voltage is approx 1.5V.

Open circuit voltage:

0.5V

continuously.

Overload protection: 250V DC/AC peak value
WARNING: Do not input any voltage at this range.

3.2.11 Temperature（℃）

Range Accuracy Resolution

-40℃-1000℃

Thermocouple: K type

WARNING: do not input any voltage at this range.

4. OPERATION

4.1 Panel Description

＜400 ±(0.8%+4)℃

≥400 ±(1.5%+15)℃

1℃

① LCD: display the measuring value and unit.
② Function key:
②-1. RST key: when the meter under sleep or lock states,

press this key, the meter will be active.

② -2. Hz/DUTY key: when measuring the AC

voltage/current, press Hz/DUTY can choose

voltage/frequency/duty cycle or current/frequency/duty

cycle mode. When measuring the Frequency, press

Hz/DUTY will shift between frequency and duty cycle

(1~99%） measurement.

②-3. REL key: press it to store the present reading as a reference for subsequent readings. The

display is zeroed, and the stored reading is subtracted from all subsequent readings and REL symbol

appears. REL (readings) = input value - reference value. Press it again to exit the REL mode and

“REL” symbol will disappear.

②-4. HOLD key: press the key, the measuring value will be held on LCD and HOLD symbol

appears. Press it again to exit the hold mode and HOLD symbol will disappear.

②-5. RANGE key: auto range is the default when you turn on the meter. Press RANGE it will enter

manual range mode. Under manual range mode, press RANGE each time will select a higher range

till reach the highest range then back to the lowest range. Press RANGE for 2 seconds it will back to

auto range mode.

②-6. DC/AC key: select DC/AC mode.
③ Input terminal for hFE measurement
④ Rotary switch: used to change the range and choose functions.
⑤ Input terminal for temperature measurement.
⑥ Voltage, current, resistance, frequency input terminal.
⑦ Battery case.

4.2 DCV measurement

4.2.1 Insert the black test lead into “COM” terminal, and the red one into “V/Ω/Hz” terminal.

4.2.2 Switch the knob to V range. Press DC/AC key to choose DC mode.

4.2.3 Auto range is the original states, it will display “AUTO” symbol. Press “RANGE” key to

change to manual range mode, and 400mV, 4V, 40V, 400V, 1000V range is selectable;

4.2.4 Connect test leads to the test point; LCD will display polarity and voltage of the test point

connected by the red test lead.

NOTE:

1. Under manual range mode, if LCD displays “OL”, it means over range, you should select

the higher range.

2. Do not input a voltage over DC 1000V. It may cause damage to the circuit of meter.

3. Be careful while measuring a high voltage circuit. DO NOT touch the high voltage circuit.

4. The built –in buzzer will beep to warn user, when the measuring voltage over DC1000V.

4.3 ACV measurement

4.3.1 Insert the black test lead into “COM” terminal, and the red one into “V/Ω/Hz” terminal.

4.3.2 Switch the knob to V range, and press “DC/AC” key to choose AC mode;

4.3.3 Auto range is the original states, it will display “AUTO” symbol. Press “RANGE” key to

change to manual range mode, and 400mV, 4V, 40V, 400V, 750V range is selectable;

4.3.4 Connect test leads to the test point; LCD will display voltage of the two test points.

Note:

1. At 400mV range there is only manual range available.

2. Under manual range mode, if LCD displays “OL”, it means over range, you should select

the higher range.

3. Do not input a voltage over AC 750V. It may cause damage to the circuit of meter.

4. Be careful while measuring a high voltage circuit. DO NOT touch the high voltage circuit.

5. The built –in buzzer will beep to warn user, when the measuring voltage over AC750V.

4.4 DCA measurement

4.4.1 Insert the black test lead into “COM” terminal and the red one into “mA” terminal (Max.

400mA) or into “A” terminal (Max.20A);

4.4.2 Switch the knob to a proper current range, and then connect the test leads to the electric

circuit. LCD will display polarity and current of the test point connected by the red test lead.

Note:

1. Firstly users should select the highest range, if users not sure about the range of current

under test, and then select the proper range based on displaying value.

2. If the LCD displays “OL”, it means the current is over range. Now you need to select a

higher range.

3. When tested current ≥10A at 20A range, buzzer will sound to remind user.

4. Maximum input current is 400mA or 20A (subject to where the red test lead insert into).

Current higher than that will damage the fuse, and may cause damage to the circuit of meter.

4.5 ACA measurement

4.5.1 Insert the black test lead into “COM” terminal and the red one into “mA” terminal (Max.

600mA) or into “A” terminal (Max.20A);

4.5.2 Switch the knob to a proper current range, press “DC/AC” key to select the AC mode,

and then connect the test leads to the electric circuit. LCD will display current value.

Note:

1. Firstly users should select the highest range, if users not sure about the range of current

under test, and then select the proper range based on displaying value.

2. If the LCD displays “OL”, it means the current is over range. Now you need to select a

higher range.

3. When tested current ≥10A at 20A range, buzzer will sound to remind user.

4. Maximum input current is 400mA or 20A (subject to where the red test lead insert into).

Current higher than that will damage the fuse, and may cause damage to the circuit of meter.

4.6 Resistance measurement

4.6.1 Insert the black lest lead into “COM” terminal and the red one into “V/Ω/Hz” terminal.

4.6.2 Switch the knob to Ω range, and connect the leads with the resistor under test.

4.6.3 Press “RANGE” key to choose auto or manual range.

4.6.4 Before measuring low resistance, you should make the test leads short-circuit at first,

and then press “REL”. By this way, you can get the actual value of the resistance.

Note:

1. Firstly users should select the highest range, if the value of resistance is unknown

beforehand, and then select the proper range based on displaying value.

2. The LCD displays “OL” when the resistance is over the selected range. The knob should be

adjusted 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 measurement.

3. When input terminal is in open circuit, LCD will display “OL”.

4. Before measuring in line resistor, make sure that the power is off and all capacitors are

discharged completely.

5. When there is big error, it may be affected by other online component or there is voltage on

the resistor.

6. Do not input any voltage at resistance range.

4.7 Capacitance measurement

4.7.1 Switch the knob to “

4.7.2 Insert the black test lead to “COM” terminal and the red one to “V/Ω/Hz” terminal;

4.7.3 If the LCD doesn’t display “0”, press “REL” to clear the reading;

4.7.4 Connect the capacitor to “COM” and “VΩHz” terminal. (Note: the red test lead is for

positive pole ○＋).LCD displays capacitance value.

Note:

1. Don’t input voltage or current to the “VΩHz” terminal when measuring the capacitance or

the capacitor still in the “Cx” terminal.

2. In order to assure the accuracy, please press “REL” to clear the reading before testing.

3. There is only the auto range mode under the capacitance range.

4. The capacitor must be completely discharged before testing.

5. The reading of 200uF range will take more than 15 seconds to be stable.

4.8 Frequency measurement

4.8.1 Insert the black lest lead into “COM” terminal and the red one into “V/Ω/Hz” terminal.

4.8.2 Switch the knob to “Hz” range, connect the test leads or shielded cable to the signal

source or the load which is tested.

4.8.3 Press “Hz/DUTY” key to switch frequency/duty cycle measurement, LCD will display

the frequency or duty cycle of the signal source which is tested.

Note:

1. There is only the auto range mode under the frequency range;

2. The meter can still work if the input current is higher than 10V rms, but the accurac y is not

guaranteed;

3. In noisy environment, it's better use shield cable to measure a low signal;

4. When measuring high voltage circuit, do not touch the high voltage circuit;

5. Don’t input voltage higher than 250V DC or AC peak value, or it may damage the meter.

”range;