East Coast Office (978) 461-2100
West Coast Office (949) 600-6400

Electrical and Medical Device Testing
Instrumentation & Systems

Need it now?

Your request will be answered personally by one of our experienced sales engineers!

Key Features

  • High performance AC current output: 45A
  • Wide resistance measurement range: 10 ~ 510mΩ
  • Meet UL, CSA, TUV, VDE, CE safety test requirements
  • Compact size and easy to operate
  • Provide reliable and stable test results
  • Built-in resistance compensation function
  • Standard RS-232 interface
  • CE Certified

Ground Bond Applications

Ground resistance and ground integrity production test of appliances, instruments and ITE in accordance with IEC, UL, TUV, CSA, EN and other standards. Ground connection on devices which use a 3-prong power cord.

  • ITE / consumer electronic safety testing
  • Transformer safety testing
  • Generator/motor safety testing
  • Non-electronic safety testing
  • Appliance electrical safety testing
  • Medical electrical safety testing

» 978-461-2100
» Email sales
» Datasheet

Get our Newsletter: Click the link below to register.

Guardian 1050 - Ground Bond Tester

The Guardian 1050 is an instrument dedicated to measuring grounding resistance within the range of 0.1~510 mΩ and AC current output up to 45A. Its compact design and easy operation is most suitable for ground testing in the production line. The built-in resistance compensation function results in highly reliable, stable test results. The Guardian 1050 is an economical and useful ground bond tester.

Guardian 1050 AC current output 45A
Wide resistance range: 10 ~ 510mΩ

The Guardian 1050 can be incorporated into an automated manufacturing environment with remote start and GO/NOGO results output through the rear panel PLC interface.

See Specs


Ordering information

Guardian 1050: Ground Bond Tester

A190701: Remote control box
A195720: GPIB interface
A190510: Printer interface



Guardian 1050
Mode Ground Bond
Grounding Resistance Test
Output Current AC : 3~45 A
Load Regulation 1% + 0.3 A
Resolution 3~30A 0.01A / 30.1~45A 0.1A
Current Accuracy ±(1.5% of setting + 0.5% of full scale)
Output Frequency 50Hz / 60Hz
Resistance Range 0.1 ~ 510 mΩ
Resistance Resolution R display counts/ I display counts) >0.2, Resolution : 1mΩ
(R display counts/ I display counts) <0.2, Resolution : 0.1mΩ
Resistance Accuracy ±(2% of reading + 0.5% of full scale)
Offset - A predetermined value can be substracted from the measured value and the result of substraction can be displayed.
- The result of subtraction can be compared with a Good/No Good judgement reference value, and the result of the comparison can be used for the judgement.
Offset Range 0 ~ 100 mΩ
Test Time 0.5 ~ 999.0 sec., continue
Waveform Sine Wave
GO/NOGO Judgment - A no-good judgement is made when a resistance greater that the high limit value is detected.
- A no-good judgment is made whne the output current is cutout and a no-good alarm signal is delivered.
- If no abnormal state is detected during the test time, a good judgment is made and a good signal is delivered.
Limit HI-LIMIT : 0.1 ~ 510 mΩ
LOW-LIMIT: OFF, 0.1 ~ HI-LIMIT Value 510 mΩ MAX.
Operation Environment Temperature : 0°C~40°C (32° to 104° F), <80% R.H
Power Consumption No load: < 100VA; with rated load: 880W MAX.
Power Requirements 100V / 120V / 220V-10% / 240V-10% ~ +5%
Weight < 16 kg

*All specifications subject to change without notice.