SC640 – CLAMP METER

An advanced clamp meter with a swivel head for getting into tight spaces. The SC640 adds inrush current measurement — critical for diagnosing compressor and motor startup problems. Dual display shows two readings at once. True RMS for accurate readings on variable-frequency drives and ECM motors.

Specs: True RMS, swivel head, inrush current, dual display, temperature measurement, by Fieldpiece

Replaces: SC640

Fits: HVAC electrical diagnostics — motors, compressors, variable-speed equipment, and general electrical testing

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypeClamp meter

What meter do I actually need for HVAC?

A true-RMS multimeter that reads AC and DC volts, resistance, microamps and capacitance covers most of the work. Microamps matters for flame sensors, and capacitance means you can test a run capacitor instead of guessing at it.

Why true RMS?

An averaging meter reads wrong on the distorted waveforms that ECM motors and variable-speed equipment produce. True RMS reads them correctly. On modern equipment it is not optional.

Can I test a capacitor with a regular meter?

Only if it has a capacitance range, and only after the capacitor is fully discharged. If yours does not, bring the capacitor to us - we bench-test them free at the counter.

What is a clamp meter for?

Reading current without breaking the circuit. You clamp around one conductor to check what a compressor or blower is actually drawing against its nameplate rating. It is the fastest way to tell a struggling motor from a healthy one.

What CAT rating do I need?

CAT III is the sensible minimum for HVAC. It is the meter's ability to survive a voltage transient without becoming a hazard in your hand. Cheap unrated meters are the ones that fail dangerously.

Do you stock meters and probes?

On the shelf at 10226 Plano Rd, Suite 104 in Dallas.