Analog Technologies VC480C User manual

2352 Walsh Ave. Santa Clara, CA 95051. U. S. A. Tel.: (408) 748-9100, Fax: (408) 748-9111 www.analogtechnologies.com
Copyrights 2000 – 2012, Analog Technologies, Inc. All Rights Reserved. Updated on 11/22/2012 1
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nalog Technologies VC480C
Multimeter
Figure 1. The Photo of Actual VC480C
Figure 2. The Photo of Actual VC480C
FEATURES
Display: 3 1/2 LCD Display, Max.Display 1999
Zero Calibration: Calibrated to Zero by External Tools
Sampling Rate: Approx.3 times/sec
Lower Battery Indication: “ ”
Additional Temperature Coefficiency: 0.15 × Specified
Accuracy/ (<18 or >28 )℃℃ ℃
Power Consumption: <120mA
Fuse: 150mA/60V Resettable Fuse
Altitude: <2000m
APPLICATIONS
It's widely used for measuring milli resistance over 0.01mΩ,
different conductors, heating components, soldered point
resistance, etc.
DESCRIPTION
VC480C adopts a highly precise constant current source.
This milli-ohm meter can make 4-wire resistance
measurement via accurate digital bridge. It can measure milli
resistance over 0.01mΩ, different conductors, heating
components, soldered point resistance, etc.
With digital bridge, the instrument has the features of being
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 contacting resistance
measurements of power resistor, motor coils, transformers,
PCB boards, cables, antenna, communication equipments,
electric machines, electrical facilities, etc.
Figure 3. The Photo of Actual VC480C

2352 Walsh Ave. Santa Clara, CA 95051. U. S. A. Tel.: (408) 748-9100, Fax: (408) 748-9111 www.analogtechnologies.com
Copyrights 2000 – 2012, Analog Technologies, Inc. All Rights Reserved. Updated on 11/22/2012 2
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nalog Technologies VC480C
Multimeter
GENERAL SPECIFICATIONS
Table 1.
Display 3 1/2 LCD display, Max.display 1999
Zero Calibration Calibrated to zero by external tools
Sampling Rate Approx.3 times/Sec.
Lower Battery Indication
Additional Temperature
Coefficiency: 0.15 × specified accuracy/ (<18 or >28 )℃℃ ℃
Altitude <2000m
Over Range Indication Displays “1” when exceeding upper limit.
Operation Environment In-door use Pollution category II
Temperature: -15℃-55℃Relative humidity: <75%RH
Storage Environment Temperature -40℃-60℃
Relative humidity: <90%RH
Power Source 5# battery LR6 (1.5V) ×6 (or external AC adapter)
With lower battery indication
Power Consumption <120mA
Fuse 150mA/60V resettable fuse
Dimension 175 (L) × 116 (W) × 62.5 (D) mm
Weight 580g (including battery)
TECHNICAL SPECIFICATIONS
Accuracy: ± (a% rdg + least effective digit)
Ambient environment to ensure accuracy: temperature (23±5) ℃, relative humidity <75%
Table 2.
Range Accuracy Resolution Testing current
20 mΩ
±(0.5% rdg±3)
0.01 mΩApprox.100mA
200 mΩ0.1 mΩ
Approx.50mA
2 Ω1 mΩ
20Ω1 0mΩ
200Ω1 00mΩ
2kΩ1Ω

2352 Walsh Ave. Santa Clara, CA 95051. U. S. A. Tel.: (408) 748-9100, Fax: (408) 748-9111 www.analogtechnologies.com
Copyrights 2000 – 2012, Analog Technologies, Inc. All Rights Reserved. Updated on 11/22/2012 3
A
nalog Technologies VC480C
Multimeter
OPERATION
Table 3. Panel Description
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: Display testing results and unit symbols.
3 Input terminal for the black test lead
4 Input terminal for the red test lead
5 Zero knob: Calibrate the zero readings in mΩrange.
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: It's used to lock the shoulder strap so that the instrument can
be hung on the neck to save hands.
Instructions
1. The first time of operation, please make sure that there is enough power source. If not, open the battery door and put into 6
pcs of 5# batteries (refer to battery replacement). 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 that 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.
CAT.Ⅲ 50V

2352 Walsh Ave. Santa Clara, CA 95051. U. S. A. Tel.: (408) 748-9100, Fax: (408) 748-9111 www.analogtechnologies.com
Copyrights 2000 – 2012, Analog Technologies, Inc. All Rights Reserved. Updated on 11/22/2012 4
A
nalog Technologies VC480C
Multimeter
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 Impedance 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
connectors of the black test lead to the two black connectors of the instrument on the left side.
2. Tune the switch to a suitable range.
3. Clamp the two test clips on the 0 ohm circuit terminals, and adjust the zero knob to make the reading as 0.
4. Once a new range is selected, always do the zero calibration before measurement.
5. To measure an unknown resistor Rx, follow the following method as illustrated below:
6. To measure a resistor on a PCB, follow the following method as illustrated below:
7. The tested result will be displayed on the LCD.
Caution
1. If the tested resistance is over 2kΩor there is open circuit, the LCD displays “1”.
2. When testing a live resistor, to ensure safety, do not proceed testing until the tested circuit is completely powered off and
all capacitors are fully discharged.
3. If testing results have considerable, it may be caused by other live components of the same circuit or by electric potential
on the two ends of the resistor.
4. Do not input voltage to the resistance range!
DATA HOLD
Press the “HOLD” button, the current data will be held on the LCD. Press the “HOLD” button again to cancel data hold.
Note: There is no data hold function during insulation resistance measurement.
BACKLIT DISPLAY
Pressing “*” button, the LCD backlight turns on. Pressing “*” button again, the LCD backlight turns off.
SAFETY INSTRUCTIONS AND MAINTENANCE

2352 Walsh Ave. Santa Clara, CA 95051. U. S. A. Tel.: (408) 748-9100, Fax: (408) 748-9111 www.analogtechnologies.com
Copyrights 2000 – 2012, Analog Technologies, Inc. All Rights Reserved. Updated on 11/22/2012 5
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nalog Technologies VC480C
Multimeter
The tester is a precise instrument. User is not allowed to apply any modification to the instrument circuit.
Caution
1. To ensure safety, the tested object must be completely shut off from power supply and must be testified that the tested
object has been fully discharged by short circuit discharge to testify that the tested object dose have any electrical hazard.
2. Do not apply voltage measurement to the input terminals.
3. Do not apply any measurement before the instrument’s batteries are well installed or before the rear cover is well loaded.
4. Before change battery or change fuse, remove all test leads from the tested object and turn off the power switch.
5. Keep the instrument away from water and dust. Do not fall or throw the instrument.
6. Keep the instrument away from high temperature, high humidity, flammable, explosive and strong magnetic environment.
7. Use a soft cloth dampened in a solution of mild detergent and water to clean the instrument. Do not spray cleaner directly
onto the instrument or use any abrasives or strong solvent.
8. If long time no use, take out the batteries from the instrument to avoid battery leakage damaging the instrument.
9. When use 9V battery, if the LCD displays low battery symbol “ ”, please replace battery, see table 4.
Table 4. Step
1 Use a screw driver to open the battery door screws, and take off the battery door.
2 Take off the battery and replace with a new one. To ensure long time battery
power supply, it is recommended to use alkaline batteries.
3 Load the battery door and tighten the screws.
FUSE REPLACEMENT
The instrument uses a 150mA/60V resettable fuse. In case of replacement, please use a fuse of the same specification. And
follow instructions as below:
1. Tune the function switch to “OFF” position.
2. Use a screw driver to open the screws on the bottom, and take off the bottom cover.
3. Take off the PCB screws, and take off the PCB.
4. Locate the resettable fuse on the PCB, which is marked with “FUSE”. Use an iron to take off the fuse and replace it with a
new one of same spec.
5. Re-load the PCB, bottom cover and screws.
Caution
The instrument uses a resettable fuse, which will protect the internal circuits once wrong operations occur. Once the wrong
operation is canceled, the fuse will automatically reset, and there is no need to change fuse. Once a fuse change is in need, use a
fuse of the same spec.

2352 Walsh Ave. Santa Clara, CA 95051. U. S. A. Tel.: (408) 748-9100, Fax: (408) 748-9111 www.analogtechnologies.com
Copyrights 2000 – 2012, Analog Technologies, Inc. All Rights Reserved. Updated on 11/22/2012 6
A
nalog Technologies VC480C
Multimeter
PACKING LIST
1. Digital milli-ohm meter ×1pcs
2. 4-wire test lead ×1 pair
3. 5# battery (1.5V) ×6pcs
4. Operation manual ×1pcs
5. Shoulder strap ×1pcs
TROUBLE SHOOTING
If the instrument does not work properly, the following self-check steps will help to solve general faults.
Table 5.
Fault Solution
No display
● Power off - please turn on the power
● Replace the batteries
symbol appearance ● Replace the batteries
Error value ● Replace the batteries
ORDERING INFORMATION
Table 6. Unit Price
Part# 1-2 ≥3
VC480C $118.07 $117.07
Note: If you buy 5 or more, please contact us for a better price.
NOTICE
1. ATI reserves the right to make changes to its products or to discontinue any product or service without notice, and advise
customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied
on is current and complete.
2. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including
those pertaining to warranty, patent infringement, and limitation of liability. Testing and other quality control techniques are
utilized to the extent ATI deems necessary to support this warranty. Specific testing of all parameters of each device is not
necessarily performed, except those mandated by government requirements.
3. Customers are responsible for their applications using ATI components. In order to minimize risks associated with the
customers’ applications, adequate design and operating safeguards must be provided by the customers to minimize inherent
or procedural hazards. ATI assumes no liability for applications assistance or customer product design.
4. ATI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright,
mask work right, or other intellectual property right of ATI covering or relating to any combination, machine, or process in
which such products or services might be or are used. ATI’s publication of information regarding any third party’s products
or services does not constitute ATI’s approval, warranty or endorsement thereof.
5. IP (Intellectual Property) Ownership: ATI retains the ownership of full rights for special technologies and/or techniques
embedded in its products, the designs for mechanics, optics, plus all modifications, improvements, and inventions made by
ATI for its products and/or projects.
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