Description
Fluke 321 Clamp Meter Repair and Calibration
The Fluke 321 is a compact AC clamp meter — it measures AC current up to 400 A by clamping around a conductor, plus voltage, resistance, and continuity, for routine electrical work in tight spaces. Its accuracy depends on the current-sensing jaw and the measurement circuitry, which is where service and calibration focus.
June Company repairs and calibrates the Fluke 321 for electricians and HVAC/maintenance technicians.
Common Fluke 321 problems we fix
- Current readings inaccurate or drifting — current-sensing jaw or measurement-circuit drift, recalibrated against standards.
- Clamp jaw won’t read or is erratic — jaw mechanism or sensor faults, repaired.
- Voltage/resistance functions off — the lead-input measurement path, recalibrated.
- Display faults — missing or dim segments, repaired.
- Won’t power on — battery-contact or power faults.
FAQs
My 321 clamp readings are off — fixable? Yes. Current-sensing and measurement drift is repairable and recalibrated, then verified so all functions read accurately, with a NIST-traceable certificate.
Do you calibrate all functions? Yes — current, voltage, and resistance are checked against our standards.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.




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