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ISO 9001 and 17025 Certified



DC Micro-Ohmmeter

9053-DG [Dual Ground Option]

The DMOM-600 is specifically 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 (33 lbs/ 15 Kg) micro-ohmmeter is designed to meet the IEEE C57.09-1999 (5.15) requirement for testing circuit breaker contact resistance.

The DMOM-600 can accurately measure resistance values from 1 micro-ohm to 450 milliohms. A 0.1 micro-ohm resolution is possible with current greater than 5A. The DMOM-600 applies a selectable true DC test current from 10A to 600A to the resistance load to be tested. The DMOM-600 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-600 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.

  • 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
  • 10 to 600A programmable test current
  • Built-in 2.5" wide thermal printer





Technical Specifications

TYPE Portable micro-ohmmeter
PHYSICAL SPECIFICATIONS Dimensions: 16.8" W x 12.6" H x 12" D (42.7cm x 32cm x 30.5cm)
Weight: 33 lbs (15 Kg)
INPUT POWER 100 – 240 Vac, 50/60 Hz
RESISTANCE READING RANGE 1.5 milliohms at 600A to 450 milliohms at 10A
Typical Accuracy:
±(0.15% of reading + 0.15% FS) at test current of 10-600A
TEST CURRENT RANGE 10 Ampere to 600 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
PRINTER Built-in 2.5" wide thermal printer
PC SOFTWARE  Windows-based analysis software included with purchase price
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 15 ft (4.6 m), #1 AWG test cables, power cord, ground cable
OPTIONS Shipping case, 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).



Field Pictures

DMOM-600 and LTCA-10 at Inducor Ingenieria SA, Argentina