AIDETEK VC480C User Manual

DIGITAL MILLI OHM METER
OPERATION MANUAL
Contents
1. General……………………………………..1
2. Panel Description…………………………1
3. Technical Specifications...………………1
4. Operation Instruction………………….…1
5. Measuring Insulated Resistance…….…1
6. Safety Instructions…………………….….1
7. Packing List……………………………......1
8. Trouble Shooting…………………….……1
1. General
Adopting a highly precise constant current source, this
milli-ohm meter can make 4-wire resistance measurement via
accurate digital bridge. It can meansure milli resistance over
0.01mΩ, different conductors, heating components, soldered
point resistance, ect.. With digital bridge, the instrument has the
features of easy to operate, wide test range, highly stable
performance, backlit LCD display, data hold and auto power off.
Using a shoulder strap, it can be used by both hands. It is an
ideal instrument to be used for contact resistance
measurements of power resistor, motor coils, transformers,
PCB boards, cables, antenna, communication equipments,
electric machines, electrical facilities, etc.
2. Panel Descriptions
1. Power switch/function switch: power ON/OFF the
instrument and selects functions. To save power, turn the
switch to “OFF” when not in use.
2. LCD display: displays testing results and unit symbols
3. Input terminal for the black test lead
4. Input terminal for the red test lead
5. Zero knob: used to calibrate the zero readings in mΩ range
6. “*” key: LCD backlight ON/OFF key
7. “HOLD” key: press to hold the current readings on the LCD.
The LCD will display “HOLD” symbol. Press again to
cancel the data hold function.
8. Power indicator (LED)
9. Terminal of DC 9V AC adapter (
). It is used to
connect to external power source for power supply.
10. Shoulder strap locker: used to lock the shoulder strap so
that the instrument can be hung on the neck to save
hands.
3. Technical Specifications
1. General Specifications
1) Display: 3 1/2 LCD display, max.display 1999
2) Over range indication: displays “1” when exceeding upper
limit
3) Zero calibration: calibrated to zero by external tools
4) Samplign rate: approx.3 times/Sec.
5) Lower battery indication: the LCD display “ ” symbol.
6) Additional temperature coeffciency: 0.15 x speficified
accuracy/ ℃ (<18 ℃ or >28 ℃ )
7) Altitude: <2000m
8) Operation environment: in-door use; pollution category II;
temperature -15 ℃ -55 ℃ , relative humidity <75%RH
9) Storage environment: temperature -40 ℃ -60 ℃ , relative
humidity <90%RH
10) Power source: 5# battery LR6 (1.5V) x6 (or external AC
adapter). With lower battery indication.
11) Power consumption: <120mA
12) Fuse: 150mA/60V resettable fuse
13) Dimension: 175 (L) x 116 (W) x 62.5 (D) mm
14) Weight: 580g (including battery)
2. Techical specifications
Accuracy:±(a% rdg ＋ least effective digit)
Ambient environment to ensure accuracy: temperature
(23±5) ℃ , relative humidity <75%
Calibration date: 1 year from off-factory date
Range Accuracy Resolution Testing current
20 mΩ ± （ 0.5%rdg±3 ） 0.01 mΩ Approx.100mA
200 mΩ
±
（ 0.5%rdg±3 ）
0.1 mΩ
Approx.50mA
2 Ω 1 mΩ
20Ω 1 0mΩ
200Ω 1 00mΩ
2kΩ 1Ω
4. Operation Instructions
1) For the first time of operation, please make sure there is
enough power source. If not, open the battery door and put
into 6 pcs of 5# batteries (Refer to battery replacement on
page 3). Note the batter polarities.
2) When connecting to an external AC adapter, the battery
power supply will be shut off. Do not charge the batteries.
NOTE: choose a correct power supply mode ( ).
3) To ensure measurement accuracy, warm up the instrument
for at least 10 seconds before operation.
4) Before measurement, make sure the 4-wire test leads are
safe and sound. Do not use broken test leads.
5) To check the instrument is working properly, test a resistor of
known resistance before other measurements.
6) To avoid damage to instrument circuit, do not input voltage to
the 4-wire test lead socket.
Principles:
1) Refer to the following illustrations. There is a testing current
going through the range from “I+” to “I － ”
2) This current is going through a resistor Rx (resistance value
not know)
3) The voltage Vx can be measured on terminal Rx1/Rx2:
Vx=Rx x Is, hence Rx=Vx/Is
4) The unknown resistance value can be calculated via Vx
value, and will be displayed on the LCD.
5) To have an accurate resistance value, please make zero
calibration before measurement.
Accurate impedace measurement:
1) Input the two connectors of the red test lead into the two red
connectors of the instrument on the right side, and the two
CAT .Ⅲ 50V
.Ⅲ 50V.Ⅲ 50V
.Ⅲ 50V

AIDETEK VC480C Specifications

General

Type	Digital Multimeter
DC Current Range	200μA/2mA/20mA/200mA/10A
Diode Test	Yes
Continuity Buzzer	Yes
Data Hold	Yes
Power Supply	9V Battery
Operating Temperature	0°C to 40°C
Storage Temperature	-10°C to 50°C
Resistance Range	200Ω/2kΩ/20kΩ/200kΩ/2MΩ
Display	LCD
Measurement Range	As per individual functions
Resolution	0.1mV

Summary

General Instrument Overview

Digital Milli Ohm Meter Panel Layout

Power Switch and Function Switch

Controls power and selects instrument functions for operation.

LCD Display

Displays testing results and unit symbols on the instrument.

Input Terminal for Black Test Lead

The input terminal for connecting the black test lead to the instrument.

Input Terminal for Red Test Lead

The input terminal for connecting the red test lead to the instrument.

Zero Knob for Zero Calibration

Used to calibrate the zero readings in the mΩ range for accurate measurements.

LCD Backlight Control Key

Controls the LCD backlight ON/OFF function for better visibility.

Data Hold Function Key

Holds the current readings displayed on the LCD. Press again to cancel.

Power Indicator LED

Indicates the power status of the instrument.

AC Adapter Terminal

Terminal for connecting an external DC 9V AC adapter for power supply.

Shoulder Strap Locker

Locks the shoulder strap, allowing the instrument to be hung hands-free.

Technical Specifications and Principles

General Specifications

Details device display, range indication, calibration, sampling rate, battery, and environment specs.

Measurement Accuracy

Specifies the accuracy of measurements under defined ambient conditions.

Measurement Principles

Explains the four-wire resistance measurement principle and calculation.

Operation Instructions and Safety

Initial Operation and Warm-up

Instructions for initial operation, battery installation, and warm-up period.

AC Adapter Usage

Notes on using an external AC adapter and its effect on battery power.

Measurement Preparation

Steps to ensure measurement accuracy, including warm-up and lead checks.

Test Lead Inspection

Emphasizes checking the 4-wire test leads for safety and soundness before use.

Pre-measurement Accuracy Check

Recommends testing with a known resistor to verify instrument functionality.

Preventing Circuit Damage

Warns against inputting voltage to the 4-wire test lead socket to prevent damage.

Resistance Measurement Procedure

Step-by-step guide on connecting leads and measuring resistance on circuits and PCBs.

Data Hold and Backlight Functions

How to use the data hold feature and turn the LCD backlight on or off.

General Safety Instructions

Provides essential safety precautions for using the instrument and handling tested objects.

Maintenance and Cleaning

Guidelines for cleaning the instrument and precautions for long-term storage.

Battery Replacement

Detailed steps for replacing the batteries, recommending alkaline types.

Fuse Replacement

Instructions for replacing the resettable fuse, emphasizing correct specification.

Packing List

Lists all items included in the product packaging.

Troubleshooting and Manual Disclaimer

Troubleshooting Common Faults

Provides solutions for common instrument faults like no display or error values.

Manual Update and Liability Disclaimer

Notes on manual changes, manufacturer responsibility, and usage limitations.