UNI-T UT117C Multimeter Teardown Notes

The UT117C is a common field meter. A careful teardown shows the input protection stack, ADC front-end, and rotary switch—the usual wear points when readings go weird.

If readings drift

• Inspect banana jack welds and rotary contacts for oxidation.
• Check PTC/fuse protection after an overload event.
• Calibrate only if you have a known reference; do not invent pots to twist.

Safety notes

Meters that survived a mains misconnect may look fine and still lie—verify against a second meter before trusting safety-critical measurements.

FAQ

CAT rating?

Respect the marked CAT/voltage; the plastic shell is not optional armor.

Worth opening?

Mostly for education or fuse replacement.

Photo: Unsplash. Repair steps are general guidance—model variants differ. Unplug power and follow ESD-safe practice before opening devices.