Description
Fluke CNT-90 Timer/Counter Repair
The Fluke CNT-90 is a high-performance timer/counter/analyzer — a benchtop instrument that measures frequency, period, time interval, and more with very high resolution for RF, electronics, and calibration work. Its accuracy lives in the timebase reference and the counting/measurement circuitry, which is where service and calibration focus.
FlukeMeterRepair.com repairs and calibrates the Fluke CNT-90 for calibration labs and electronics shops.
Common Fluke CNT-90 problems we fix
- Timebase / frequency-reference drift — the reference out of spec, causing inaccurate measurements, recalibrated against standards.
- Input / counting-circuit faults — a channel not counting or triggering correctly, repaired.
- A function dead — a measurement mode failed, repaired.
- Communication / interface faults — the GPIB/USB/remote interface not connecting, repaired.
- Display or power faults.
FAQs
My CNT-90 measures inaccurately — fixable? Yes. Timebase and input faults are repairable, then the counter is recalibrated against our standards so frequency and interval measurements are accurate, with a NIST-traceable certificate.
Is the timebase verified? Yes — checked against our standards.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or request service.




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