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

Vanguard_Auto-Ohm-200-S3With a Dual Ground option, the Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter can measure circuit breaker contact resistance with both sides of the breaker bushing being grounded.

When a test current is applied to a circuit breaker with both sides grounded, some of the test current flows through the safety ground cables. Using an external current sensor, the Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter measures and eliminates this current from the total test current.

The Vanguard Auto-Ohm-200 S3 Ampere Micro-Ohmmeter then calculates the actual resistance value of the circuit breaker.



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

TYPE Portable Micro-Ohmmeter

PHYSICAL SPECIFICATIONS 17″ W x 7″ H x 13″ D (43.2cm x 17.8cm x 33cm); Weight: 16.8 lbs (7.6 Kg)

INPUT POWER 100-240 Vac, 14A, 50/60Hz

RESISTANCE READING RANGE 1 micro-ohm to 10 milliohms at 200 A (0.1 micro-ohm resolution), 1 micro-ohm to 5 ohms at 1A

ACCURACY 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

DISPLAY Backlit LCD (128 x 64 pixels), viewable in direct sunlight and low light levels

KEYPAD Rugged, 44key “QWERTY” membrane keypad

INTERNAL TEST RECORD STORAGE 128 test records. Each record can contain up to 64 readings


Up to 999 test records on external USB Flash drive.


PC SOFTWARE Windows XP/Vista/7 Analysis Software (included with purchase)

SAFETY Designed to meet IEC 61010 (1995), UL 61010a, and CASC22.2 standards

ENVIRONMENT Operating: 10˚C to 50˚C (15˚F to +122˚F), Storage: 30˚C to 70˚C (22˚F to +158˚F)

HUMIDITY (MAX) 90% RH @ 40˚ C (104˚ F) non-condensing

ALTITUDE (MAX) 2000m (6562 ft) to full safety specifications

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

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