Vichy VC99 3 6/7 DMM User Manual

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” 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.

Vichy VC99 3 6/7 DMM Specifications

General

Duty Cycle	0.1% to 99.9%
Temperature	-20°C to 1000°C
Continuity	Yes
Diode Test	Yes
Operating Temperature	0°C to 40°C
Power Supply	9V battery
AC Voltage	750V
DC Current	10A
AC Current	10A
Frequency	10Hz
Display	3 6/7 digits LCD, max. reading to 39999

Summary

Summary of VC99 3 6/7 DMM

Safety Notes and Precautions

Test Lead and Voltage Safety Checks

Check test leads and avoid exceeding voltage limits (DC 1000V, AC 750V).

High Voltage Measurement Caution

Exercise caution when measuring voltages above DC 60V or AC 40V.

Operational Safety Guidelines

Select correct function/range, move leads when switching functions, don't input voltage during current measurement.

Safety Symbol Introduction

Explanation of safety symbols such as high voltage, GND, and low battery.

Specifications Overview

General Features

Details on LCD display, measurement method, sampling rate, and environmental working conditions.

Technical Features

Core technical specifications including accuracy, input impedance, and overload protection for various measurement types.

Operating the Digital Multimeter

Panel Description and Function Keys

Overview of the LCD display and function keys like HOLD, REL, Hz/DUTY, DC/AC, RANGE, MAX/MIN.

DC Voltage (DCV) Measurement

Steps for measuring DC voltage using the multimeter, including range selection and lead connection.

AC Voltage (ACV) Measurement

Procedure for measuring AC voltage, covering range selection and proper lead placement.

DC Current (DCA) Measurement

Guide to measuring DC current, including selecting the correct terminal and mode.

AC Current (ACA) Measurement

Instructions for measuring AC current, specifying terminal use and mode selection.

Resistance Measurement

How to measure resistance, including using the REL function and precautions.

Capacitance Measurement

Steps for measuring capacitance, including lead connection, clearing readings, and discharge.

Frequency Measurement

Procedure for measuring frequency using the Hz/DUTY key and test leads or shielded cable.

Transistor hFE Measurement

How to measure the hFE parameter of a transistor by inserting it into the correct socket.

Diode and Continuity Test

Instructions for testing diodes (forward/backward) and checking continuity with the buzzer.

Temperature Measurement

Guide to measuring temperature using the K type thermocouple and selecting Celsius or Fahrenheit.

Data Holding Function

How to use the HOLD key to freeze the displayed measurement value on the LCD.

Auto Power Off Feature

Explanation of the automatic power-off function and how to cancel it.

Meter Maintenance and Troubleshooting

General Maintenance and Usage Precautions

Avoid inputting high voltage, using in extreme conditions, and improper cleaning.

Battery Replacement and Fuse Change

Steps for replacing the battery and fuses, ensuring correct type and handling safety.

Troubleshooting Common Issues

Solutions for common faults like no reading on LCD, big error values, or signal appearance.