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The DMOM-200 S3 is Vanguard’s fourth generation, microprocessor-based, true DC micro-ohmmeter. It is designed for testing EHV circuit-breaker contact resistances, bushing contact joints, welding joints, or for any low-resistance measuring application. This high current and very lightweight (19.8 lbs/ 8.9 Kg) micro-ohmmeter is designed to meet the IEEE C57.09-1999 (5.15) requirement for testing circuit breaker contact resistance.

The DMOM-200 S3 can accurately measure resistance values from 1 micro-ohm to 5 ohms. A 0.1 micro-ohm resolution is possible with current greater than 5A. The DMOM-200 S3 applies a selectable true DC test current from 1A to 200A to the resistance load to be tested. The DMOM-200 S3 controls the test current’s rise and fall rates. The test current rise and fall rate can be selected 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 DMOM-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.

• Very lightweight: 19.8 lbs. (8.9 Kg)
• Measures circuit breaker contact resistance with safety ground on (with the Dual Ground option)
• Stores test records on-board or on external USB Flash drive
• 1 to 200A programmable test current
• Built-in 2.5" wide thermal printer

DMOM-200 S3	Cables
Cable Part Number [8000-0016] Power + Ground Combination Cable 8000-0016 [8000-0076] 30' (9.14m) Current + 30' (9.14m) Sense Combination Cable Set with Alligator Clips 8000-0076 [8000-0147] Hand Spike Cable Set 8000-0147 [8000-0152] C-Clamp Set (2 C-Clamps) 8000-0152 [8000-0153] Replacement Alligator Clamp Set (2 Alligator Clamps) 8000-0153 [8000-0171] Complete 30' (9.14m) Micro-ohmmeter Cable Set with C-Clamps and Trafinet Connectors 8000-0171 [8000-0172] Complete 30' (9.14m) Micro-ohmmeter Cable Set with Vice Clamp and Trafinet Connectors 8000-0172 [8000-0201] Pistol Grip Sensing Probe Set 8000-0201 [8000-0221] Current Cable Set [ 30' (9.14m) ] 8000-0221 [8000-0222] Sense Cable Set [ 30' (9.14m) ] 8000-0222

DMOM-200 S3	Technical Specifications
TYPE Portable micro-ohmmeter PHYSICAL SPECIFICATIONS Dimensions: 18" W x 7"H x 15" D (45.7cm x 17.8cm x 38.1cm) Weight: 19.8 lbs (8.9 Kg) INPUT POWER 100 – 240 Vac, 50/60 Hz RESISTANCE READING RANGE 10 milliohms at 200A to 5 ohms at 1A Typical Accuracy: ±(0.15% of reading + 0.15% FS) at test current of 10-200A TEST CURRENT RANGE 1 Ampere to 200 Amperes (selectable in 1A steps); Thermally protected DC power supply. DISPLAY Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and low light levels KEYPAD 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 RS-232C PRINTER Built-in 2.5" wide thermal printer PC SOFTWARE  Windows XP/Vista/7 Analysis Software (included with purchase) SAFETY Designed to meet IEC 61010 (1995), UL 61010-a, and CAS-C22.2 standards ENVIRONMENT Operating: -10oC to 50oC (15oF to +122oF) Storage: (-30oC to 70oC (-22oF to +158oF) 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 OPTIONS Shipping case, 15 ft test cables, C-Clamp set, Hand Spike Set WARRANTY One year on parts and labor Specifications are valid at nominal voltage and ambient temperature of +25?C (+77?F).