Description
Fluke 1623 Calibration
The Fluke 1623 is an earth ground tester. These are calibrated across their resistance ranges, and on the stakeless and clamp-on models the verification also has to cover the induced-current measurement, which is a different mechanism from the three-pole fall-of-potential method and drifts independently of it.
June Company calibrates the Fluke 1623 for electrical contractors, utility crews, lightning protection installers, and inspection teams. Every point is measured against reference standards, with as-found readings recorded before any adjustment and as-left readings afterwards, so you can see what condition the instrument was actually in when it arrived.
What we verify on the Fluke 1623
- Soil resistivity measurement where fitted.
- Auxiliary electrode resistance detection.
- Voltage and continuity functions.
- Jaw alignment on clamp-on models.
- Earth resistance across all ranges.
- Stakeless or clamp-on measurement where fitted – a separate mechanism that can drift while the staked measurement stays accurate.
FAQs
What happens if it comes back out of tolerance? We record the as-found condition and tell you, because measurements you took with it since its last calibration may need reviewing. That is the reason as-found data matters.
Can it be adjusted if it has drifted? Where the instrument supports adjustment, yes – and the as-found and as-left readings are both recorded so the change is visible.
Calibration is documented and returned with the instrument. If we find a fault that calibration cannot correct, we quote the repair before going any further. Email us or submit a service request.



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