AUTO-OHM 200 S4
200 A True DC Micro-Ohmmeter
The Auto-Ohm 200 S4 is Vanguard’s fifth 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 with printer option) micro-ohmmeter is designed to meet the IEEE C57.09-1999 (5.15) requirement for testing circuit breaker contact resistance.
The Auto-Ohm 200 S4 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 Auto-Ohm 200 S4 applies a selectable true DC test current from 1A to 200A to the resistance load to be tested. The Auto-Ohm 200 S4 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 Auto-Ohm 200 S4 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.
The Auto-Ohm 200 S4 can be configured with options like a 2.5-inch thermal printer and support for testing with both-sides-grounded
Vanguard Universal Software (VUS) version 2.15 is required to open Auto-Ohm 200 S4 test result files and create reports.
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 | 1 micro-ohm to 5 ohms (max 10 milliohms @ 200A and 5 ohms @ 1A) |
TEST CURRENT RANGE | 1A – 200A (selectable in 1A steps) Thermally protected DC power supply |
RESOLUTION | 1.0 µΩ – 999.9 µΩ: 0.1µΩ 1.000 mΩ – 9.999 mΩ: 1µΩ 10.00 mΩ – 99.99 mΩ: 10µΩ 100.0 mΩ – 999.9 mΩ: 0.1mΩ 1 Ω – 5 Ω: 0.01Ω |
TYPICAL ACCURACY | ±(0.15% of reading + 0.15% FS) at test current of 1A-200A |
DISPLAY | Back-lit LCD screen (128 x 64 dots) |
KEYPAD | Rugged, 44-key “QWERTY” membrane keypad |
PRINTER | Optional built-in 2.5” wide thermal printer |
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 |
PC SOFTWARE | Windows-based analysis software is included with purchase price |
COMPUTER INTERFACE | One USB Flash drive interface |
COMPLIANCE | Electromagnetic Compatibility (EMC): FCC Part 15; ICES-003; EN61326-1:2013; EN55011 Class A Group 1; EN61000-4-2,3,4,5,6,8,11 Environmental: IEC 60068-2-1,2,27,30,55 Safety: IEC/EN 61010-1:2010 |
TEMPERATURE | 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 |
OPTIONS | shipping case, 15 ft test cables, C-clamp set, hand spike set, dual ground option, built-in thermal printer option |
WARRANTY | One year on parts and labor |
The above specifications are valid at nominal operating voltage and at a temperature of 25°C (77°F). Specifications may change without prior notice. |
Part # | Description |
Auto-Ohm 200 S4 | Auto-Ohm 200 S4 Basic Instrument |
Auto-Ohm 200 S4 DG | Auto-Ohm 200 S4 with Dual Ground Option |
Auto-Ohm 200 S4 PR | Auto-Ohm 200 S4 with Printer Option |
Auto-Ohm 200 S4 PRDG | Auto-Ohm 200 S4 with Printer and Dual Ground Options |