Extech MA63 60 A True RMS AC/DC Clamp Meter with NCV

Extech MA63 60 A true RMS AC/DC clamp meter with NCV

The Extech MA63 is a pocket-size true RMS clamp meter for AC and DC current up to 60 A, with a compact 17 mm (0.7 in) jaw, a built-in non-contact voltage detector and the usual multimeter functions. It has three current ranges (600 mA, 6000 mA, 60 A) with resolution down to 0.1 mA on AC, which makes it suitable for low-current control circuits as well as small motors and HVAC equipment.

The MA63 is the AC/DC version of the pair; the MA61 is the AC-only model. A variable frequency control (VFC) low-pass filter gives accurate readings on variable-frequency-drive signals, and the meter is supplied with test leads, a carrying case and two AAA batteries.

Technical specifications of the MA63

The figures above are from the MA61/MA63 datasheet.

Why VFC mode on the MA63 matters for drives

Variable frequency drives output a pulse-width-modulated waveform with a lot of high-frequency content. A normal true RMS meter reads that noise and gives an unstable or high reading. The MA63 has a VFC mode that applies a low-pass filter, so the fundamental component is displayed and the reading is stable, which is what a technician needs when checking motor current on a drive output, a fan coil or a pump drive.

The DC zero function removes the offset in the Hall-effect sensor on DC current ranges so that low DC currents read accurately, and the 6000 mA range is helpful for checking small DC loads such as control relays and sensor supplies.

Typical uses of the MA63

• Current checks on small three-phase motors, fans and pumps in the 1 to 60 A range.
• HVAC and refrigeration, including drive-fed compressors and fans using VFC mode.
• Low-current checks of control circuits down to milliamps.
• Panel checks with NCV followed by voltage test.
• Automotive and DC auxiliary circuits using DC current ranges.

For heavier feeders, the Extech MA440 series (400 A) or MA1500 (1500 A) are the correct tools; the MA63 is the compact choice for tight terminals.

Selection checklist for the MA63

• Confirm that maximum current is within 60 A and the conductor fits a 17 mm jaw.
• Decide whether DC current is needed (MA63) or AC only is enough (MA61).
• Check whether VFC drive measurement is required.
• Check that CAT II 600 V and CAT III 300 V suit the installation category.
• Plan for AAA batteries and a spare lead set.

Care and calibration of the MA63

Clamp a single conductor at a time, keep the jaw faces clean and the jaw fully closed, and keep the leads out of the voltage inputs when measuring current. The NCV function indicates the presence of voltage, but a dead test is needed before work. Replace the AAA batteries when the low battery icon shows. If the meter is used for acceptance records, order the -NIST version or send it for calibration at the interval of your quality system.

Applications of the MA63 in Oman and the GCC

Air-conditioning is a major load in the Gulf, and technicians in building services and industrial sites use compact clamps on fan coil units, chillers, pumps and compressors. In industrial plants, the same clamp is useful on instrument panels and control cabinets with limited space. The compact jaw and light weight suit work in hot ceiling voids and crowded risers.

Taking reliable low-current readings with the MA63

At the 600 mA and 6000 mA ranges the reading is easily disturbed by nearby conductors and by the position of the cable in the jaw. Centre the conductor, keep other cables at least a hand-width away, and close the jaw fully. On DC ranges, press the zero function with the jaw closed and empty before each measurement, because the sensor offset drifts with temperature and with the magnetic environment. If a reading is unstable on a drive output, switch on the VFC filter and note that the displayed value then represents the fundamental. Record the range and mode used so that follow-up readings can be compared fairly.

Information to send with an RFQ for the MA63

• Part number MA63 and the required quantity
• Maximum current and conductor size
• Whether AC only (MA61) or AC/DC (MA63) is required
• Delivery location in Oman or the GCC and the required lead time
• Whether calibration documentation or a traceable calibration certificate is required

Storage, handling and spares for the Extech MA63

Store the Extech MA63 in its case or holster with the test leads disconnected. Remove the batteries if the meter will not be used for several weeks, because leaking cells can damage the battery contacts. In Oman and the GCC, do not leave the instrument in a parked vehicle during summer, where cabin temperature can go well above the storage limit in the user manual.

• Inspect test leads, probes and clamps before each use and replace any lead with damaged insulation or exposed metal.
• Use only leads and accessories rated for the same or a higher measurement category than the work you do.
• Keep spare fuses of the exact type given in the manual; a wrong fuse removes the protection the meter is built with.
• Plan a regular calibration interval, often twelve months, and keep the certificate with the instrument records.

If your team uses several units of the Extech MA63, it is useful to order spare test leads and batteries in the same RFQ, so that a meter is not taken out of service for a simple accessory.

Documents and quotation

A datasheet for the Extech MA63 is attached on this page. It covers the MA61 and MA63 models, so compare columns carefully.

Send us the part number MA63, the quantity and the delivery location in Oman or the GCC, and we will reply with availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.