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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
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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 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 |
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). |
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DMOM-200 S3 at PLN Solo Substation, Indonesia
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