With 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
EXTERNAL TEST RECORD STORAGE
Up to 999 test records on external USB Flash drive.
COMPUTER INTERFACE RS-232C
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