Safety Ground Tester ASGT-600

Safety Ground Tester ASGT-600

The ASGT-600 Safety Ground Tester is a 600A DC micro-ohmmeter designed specifically to measure the resistance of protective in-service grounding and jumper cable assemblies. The ASGT-600 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.

The ASGT-600 can measure resistance value from 1 mi¬cro-ohm to 1000 milliohms. A typical test requires the two ends of the safety ground cable to be connected to the terminals of the ASGT-600. The resistance of the cable and ferrules can then be measured. If the cable size, cable length and temperature are provided, the ASGT-600 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” ther¬mal printer. A 44-key QWERTY-style rugged membrane keypad is used to input information and control the ASGT-600. A back-lit graphic LCD screen (128 x 64 pixels) is used to display menus and test results.

The ASGT-600 can store up to 100 test records in its in¬ternal memory. It also features a USB Flash drive inter¬face port that can be used to store test data in a USB flash drive (not included). The ASGT-600 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 software.

  • Resistance values from 1 microohm to 1000 miliohms
  • Resistance of cable and ferrules
  • Pass/Fail test of cables
  • Store, Software and Printer
  • QWERTY keypad LCD screen

 In-Service Cable Testing

The ASGT-600 measures the total resistance value of the cable under test and then compares it to the calculated value to determine the Pass or Fail result. In order to calculate the total resistance value, the user is first prompted for the cable size, cable length, and cable temperature. Total resistance (Rm) is calculated in accordance with the ASTM F2249-03 standard using the formula below:

Rm = 1.05 RL + 2Y = 1.05 RL + 320 μΩ*
Y = Resistance of clamps, ferrule, and portions of the cable inside the ferrule, in milliohms*
L = Cable length in feet (ferrule to ferrule measurement to the nearest inch)
R = Cable resistance, in milliohms/foot
* NOTE: The clamp and ferrule resistance value of 160 μΩ is used per the ASTM-F2249-03 standard.

Test Record Storage

The ASGT-600 can store 100 test records internally. Each test record contains test header information, test cable size, test cable length, temperature, test current, and cable resistance. Test records can also be stored on a USB flash drive via the unit's USB flash drive interface

 Test Cable Sizes and Length

Typical Safety Ground Cable sizes are #2, 1/0, 2/0, and 4/0. The test cable length, ranging from 1' to 50' per table 2 in the F2249-03 standard, is en­tered by the user.

ASGT-600 Specifications


Save Ground Tester

Physical specifications

16¾”W x 12½”H x 12” D (42.7 cm x 32 cm x 30.5 cm); Weight: 19.8 lbs. (8.9 Kg)

Input power

100 - 240 Vac, 50/60 Hz

Resistance reading range

1 micro-ohm to 1000 milliohms
(max 1.5 milliohms @ 600A, 450 milliohms @ 10A, 1000 milliohms @ 1A)


10A - 49.9A: 1% ±2 micro-ohms,
50A - 600A: 1% ±1 micro-ohm

Test voltage

5 Vdc

Test current range

10A ¬ 600A (selectable in 1A steps); thermally protected DC power supply


Back-lit LCD screen (128 x 64 pixels); viewable in bright sunlight and low light conditions


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

One RS-232C PC interface, one USB flash drive interface

Pc software

Windows®-based analysis software included with purchase price


Built-in 2½” wide thermal printer


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)


90% RH @ 40°C (104°F) non-condensing


2000 m (6562 ft) to full safety specifications


15 ft (4.6 m), #1/0 AWG test cables, power cord, ground cable

Optional accessories

shipping case, 30 ft (9.1 m) test cables, C-clamp set, hand spike set

Warranty 1 year on parts and labor

NOTE: the above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice

Thermal Printer OutputIn-Service Cable TestingSample Test Results ScreenMicrohmmeter controls

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