Fluke 323 True-RMS Clamp Meter, 400 A

323 400 A true-RMS clamp meter explained

The Fluke 323 True-RMS Clamp Meter (323) is an entry-level true-RMS clamp meter that measures up to 400 A AC and 600 V, with resistance and continuity. Its slim jaw and large display are intended for tight cable compartments. Seven Star LLC supplies 323 in Oman and the GCC as an independent supplier in Muscat, not affiliated with the manufacturer.

The 323 is the base model of the 320 series. The table decodes its key facts.

323 technical specifications

Data are from the manufacturer product page for the Fluke 323.

How the Fluke 323 True-RMS Clamp Meter works

The 323 senses AC current through the jaw by induction, so the circuit is not broken. True-RMS processing handles distorted loads such as electronic drives within the stated frequency band. Test leads are used for voltage, resistance and continuity.

The hold function freezes the display, which helps when the jaw sits in a position where the screen cannot be read. The slim body is meant to reach into narrow wiring compartments.

Key features

• Slim ergonomic design
• Large easy-to-read display
• Hold function
• Soft carrying case and two-year warranty
• Voltage, resistance and continuity

Where 323 fits and related Fluke models

The 323 has no DC current, frequency, temperature or min/max. The 325 adds all of these, and the 355 targets currents to 2000 A. For wireless use and higher accuracy, the 374 FC and 375 FC are the step up.

If your work is only load verification on AC feeders, the 323 is sufficient.

Selection checklist for 323

Confirm the following points before ordering, so that the instrument matches the work and the safety rules of your site.

• AC-only current: pick the 325 for DC.
• Maximum conductor diameter 30 mm.
• Rated CAT III 600 V / CAT IV 300 V.
• Case and leads are included.

Safe use, care and maintenance of 323

• Close the jaw fully and check that the faces are clean. Dirt or rust on the jaw faces causes reading errors, and a jaw that does not close completely should be taken out of service.
• Clamp only one conductor at a time. Two conductors of a single-phase pair or a three-phase set cancel each other and the 323 will show a value close to zero.
• Verify the clamp on a known live circuit before and after any test that decides whether equipment is safe to touch.
• Replace batteries when the low-battery indicator appears and remove them for long storage. Inspect the test leads for damage before each use of the voltage and resistance functions.
• Keep the jaw and display free of dust. In dusty Gulf sites, use the supplied case and wipe the instrument after switchgear room work.
• Respect the maximum conductor size and never clamp bare busbars unless the rating and your site procedure allow it. Treat the clamp as a measuring tool, not a switch or an isolator.
• Allow the instrument to reach ambient temperature after moving it from an air-conditioned vehicle into a hot plant area, so that condensation does not form inside the housing and the display settles.
• Schedule periodic calibration through your quality system, and keep the certificate with the instrument record so that readings used for reports remain traceable.

Typical applications of 323 in Oman and the GCC

Clamp meters are used for load checks on motors, feeders, chillers and pump drives. In Oman, maintenance teams at oil and gas plants, power and water utilities, desalination units and petrochemical sites use them for current surveys without opening circuits. A clamp reading showing a motor drawing more than its nameplate current points to a mechanical overload, a supply imbalance or a failing winding, while a reading near zero on a running pump suggests a lost phase or dry running. Because the circuit stays intact, these checks can be done on live equipment under a permit, which keeps downtime low during the hot summer months when cooling and pumping loads peak.

The 323 serves facility maintenance and electrical contractors verifying that loads draw current. In Oman it fits commercial buildings, camps and light industrial plants where a basic AC clamp is enough for pump, fan and compressor checks.

323 compared with nearby models

See each model page for additional functions.

Information to send with an RFQ for 323

To prepare an accurate quotation, please send:

• Exact model 323 and the quantity required.
• Maximum conductor size and expected current, so the jaw or flexible probe option can be confirmed.
• Whether wireless or smartphone use is needed on site.
• Any extra accessories such as a hanging strap, leads or a case.
• Calibration traceability paperwork if required on delivery.
• Delivery point in Oman or elsewhere in the GCC and the required date.

Storage, handling and spares for the Fluke 323

Store the Fluke 323 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 Fluke 323, 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

Send the part number 323 and we will confirm which manufacturer documents are available for this model.

For a quotation, send the part number 323, the quantity and your delivery location in Oman or the GCC through the RFQ button on this page. Availability and lead time are confirmed per request.