Martindale PD690SX 50V/120V/230V/400V/690V AC Proving Unit

Martindale PD690SX 50V/120V/230V/400V/690V AC Proving Unit

Safe electrical working requires the use of a voltage indicator that has been proven with a suitable proving device before and after use so to ensure the instrument is working correctly.

The Martindale PD690SX has all the capabilities of the standard PD690S proving unit plus a unique CALCHECK feature for verifying the performance of installation testers and 5 stepped voltage thresholds matched to common two pole tester thresholds.

The CALCHECK feature makes it easy to verify the insulation and low resistance ranges on multifunction instruments and single function insulation testers on-site. This makes it ideal for identifying potential calibration issues with a multifunction tester prior to certifying a new wiring installation.

It’s easy to keep a record of periodic CALCHECK results and equipment serial numbers for assessments using the form in the user guide or downloading copies from this page.  The individual reference resistance test pads with nominal values of 0.5Ωand 1.0Ω for continuity measurements and 0.5MΩ and 1.0MΩ for insulation resistance make it simple to check and identify calibration drift and remain confident in your test results wherever you are working.

The proving unit output voltages are stepped with individual LED indicators for each voltage threshold from 50V to 690V matched to common two pole tester thresholds, ideal for identifying potential voltage tester calibration issues.

On contact, the proving unit outputs the highest voltage first instantaneously checking all LEDs up to 690V on the tester and proving the tester for safe isolation use, it then steps down through each level automatically.

At the end of the proving test, a low resistance appears across the terminals to verify the continuity function of two pole testers.

Martindale PD690SX Specifications