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Measure Resistance Confidently with the Vanguard Auto-Ohm-200 S3

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Vanguard_Auto-Ohm-200_S3The Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter accurately measures resistance values from 1 microohm to 5 ohms, and a 0.1 micro-ohm resolution is possible with current greater than 5A.

The Vanguard Auto-Ohm-200 S3 applies a selectable true DC test current from 1A to 200A to the resistance load to be tested. The Vanguard Auto-Ohm-200 S3 controls the test current’s rise and fall rates, with a selectable rate from 5 seconds to 10 seconds.

An “Auto Test” mode is also available and can be initiated simply by applying the sense cables’ leads across the two points of interest in the current path. This feature is very convenient when measuring a sequence of several resistance values in a circuit breaker contact.

The Vanguard Auto-Ohm-200 S3 can also compare test results against preset limits and determine if a test passed or failed, and a “Pass” or “Fail” flag is displayed accordingly.

Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter Specifications:


Portable micro-ohmmeter

Physical Specifications

17”W x 7”H x 13” D (43.2 cm x 17.8 cm x 33.0 cm); Weight: 16.8 lbs (7.6 kg)

Input Power

100 ¬ 240 Vac, 50/60 Hz

Resistance Reading Range

10 milliohms at 200A to 5 ohms at 1A


1A to 4.99A: 1% ±10 micro-ohms

5A to 9.99A: 1% ±2 micro-ohms

10A to 200A: 1% ±1 micro-ohm

Test Current Range

1 Ampere to 200 Amperes (selectable in 1A steps); Thermally protected DC power supply


Back-lit LCD screen (128 x 64 pixels); viewable in bright sunlight and low light conditions


Rugged, 44-key “QWERTY” membrane keypad

Internal Test Record Storage

128 test records. Each record can contain up to 64 readings

External Test Record Storage

Up to 999 test records on external USB Flash drive

Computer Interface

One RS-232C PC interface, one USB Flash drive interface

Pc Software

Windows®-based analysis software included with purchase price


Designed to meet IEC 61010 (1995), UL 61010-a, and CAS-C22.2 standards


Operating: -10°C to +50°C (+15°F to +122°F)

Storage: -30°C to +70°C (-22°F to +158°F)


90% RH @ 40°C (104°F) non-condensing


2,000 m (6,562 ft) to full safety specifications


30 ft (9.1 m), #1 AWG test cables, power cord, ground cable

With offices in Texas, Illinois and New Jersey, Protec offers a full stocks of electrical test and measurement equipment, with rental options that work for you.

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