Overview
V242 Calibration Check Unit
The V242 is intended for on-site verification of the Clare range of electrical safety testers. It is recommended that this instrument is returned to Clare Instruments for annual re-calibration.
The V242 is capable of checking the following parameters.
GROUND CIRCUIT RESISTANCE
90, 115, 450, and 575 mΩ (Calibration limits ± 5% of value)
HIPOT TEST VOLTMETER
0 – 5000 Volts A.C. (Calibration limits ± 1.5% f.s.d.)
0 – 2500 Volts D.C. (Calibration limits ± 1.5% f.s.d.)
INSULATION RESISTANCE A.C. or D.C
100 KW - 200 KW - 400 KW – 1 MW - 2 MW 5 MW – 10 MΩ - 20 MW. (Calibration limits ± 1%)
50 MW (Calibration limit ± 3%) - 100 MW (Calibration limit ± 4%)
The flash trip value of 5 mA can be checked using the Insulation Resistance value of 200 KΩ, which will give a reading of 5 mA at 1000 Volts A.C. or D.C.
No facilities provided for checking live load modules, such as ammeters and wattmeters, fitted to many Clare test stations. Such modules should be checked using a good quality AC test set.
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