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ISO 9001 and 17025 Certified



Safety Ground Tester


The Vanguard SGT-200 Safety Ground Tester is a 200A DC micro-ohmmeter designed specifically to measure the resistance of protective in-service grounding and jumper cable assemblies. The SGT-200 can measure the resistance of the grounding cables, clamps and ferrules. The measured resistance values can be compared against the calculated values (using the ASTM 2249-03 standard) and a Pass/Fail result can be printed along with the measured resistance values. Since the SGT-200 uses a DC current, there is no need to uncoil the cable under test. It can be conveniently tested in its coiled state in a much smaller testing enviornment.

The SGT-200 can measure resistance value from 1 micro-ohm to 1000 milliohms. A typical test requires the two ends of the safety ground cable to be connected to the terminals of the SGT-200. The resistance of the cable and ferrules can then be measured. If the cable size, cable length and temperature are provided, the SGT-200 will determine if the cables passes or fails the test and a pass/fail indicator will be printed on the test report.

Test results are printed on the unit's built-in 2.5” thermal printer. A 44-key QWERTY-style rugged membrane keypad is used to input information and control the SGT-200. A back-lit graphic LCD screen (128 x 64 pixels) is used to display menus and test results.

The SGT-200 can store up to 100 test records in its internal memory. It also features a USB Flash drive interface port that can be used to store test data in a USB flash drive (not included). The SGT-200 also features an RS-232C port that is used for factory diagnostics and calibration. Test records can be reviewed and printed on a PC using the provided Vanguard VUS software.



Technical Specifications

TYPE Safety Ground Tester
PHYSICAL SPECIFICATIONS Dimensions: 21”W x 8”H x 14” D (53.3 cm x 20.3 cm x 35.6 cm)
Weight: 31 lbs. (14.1 Kg)
INPUT POWER 100 – 240 Vac, 50/60 Hz
1 micro-ohm to 1000 milliohms
(max 1.5 milliohms @ 200A, 450 milliohms @ 10A, 1000 milliohms @ 1A)
10A  – 200A (selectable in 1A steps);
thermally protected DC power supply
ACCURACY 10A – 49.9A: 1% ±2 micro-ohms
50A – 200A: 1% ±1 micro-ohm
DISPLAY Back-lit LCD screen (128 x 64 pixels); viewable in bright sunlight and low-light levels
KEYPAD Rugged, 44-key "QWERTY" membrane keypad
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 INTERFACES One RS-232C PC interface, one USB flash drive interface
PRINTER Built-in 2-1/2” wide thermal printer
SAFETY Designed to meet IEC 61010 (1995), UL 61010-a, and CAS-C22.2 standards
Operating: -10°C to +50°C (+15°F to +122°F)
Storage: -30°C to +70°C (-22°F to +158°F)
HUMIDITY 90% RH @ 40°C (104°F) non-condensing
power cord, ground cable, standard cable stud (1" dia, 2 pcs), elbow adapter (female, 1/2" dia, 1 pc), bushing adapter (male, 1/2" dia, 1 pc)
ALTITUDE 2,000 m (6,562 ft) to full safety specifications
OPTIONS Shipping case
WARRANTY One year on parts and labor
Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).