Extech 380562 Bench-Top Milliohm Meter, 220 V, Comparator

Extech 380562 bench-top milliohm meter with Hi/Lo/Go comparator

The Extech 380562 is a bench-top, high-resolution milliohm meter for production, incoming inspection and workshop tests where many low-resistance parts must be checked quickly. It resolves down to 0.01 mΩ on its most sensitive range, covers seven ranges up to 20 kΩ, uses four-wire Kelvin clip leads, and includes a built-in comparator that gives a Hi, Lo or Go decision with an audible beeper. The 380562 is the 220 V version; the 110 V version is the 380560.

A large 20.3 mm (0.8 in) 1999-count display, automatic zero and a one-year warranty on the datasheet make it a practical instrument for a repair shop or a test bench.

Technical specifications of the 380562

The figures above are from the 380562 datasheet and user manual.

How the Hi/Lo/Go comparator on the 380562 works

The comparator turns the 380562 from a measuring instrument into a sorting tool. You set a high limit and a low limit; each measured part is then flagged as Hi, Lo or Go, with a beeper for the pass case, so an operator can check coils, relays, fuses, shunts, thermistor leads or cable assemblies without reading the number every time.

Because the test current changes with the range from 1 A on the two lowest ranges down to 10 µA on the highest, the meter adapts the measurement to the part. On the two lowest ranges the 1 A test current gives a larger voltage drop across tiny resistances and so a cleaner, lower-noise reading than a small-current instrument can give.

Where the 380562 is used

• Incoming inspection of busbars, links, fuses and shunts for resistance within tolerance.
• Winding resistance checks on coils, solenoids and small motors in a repair workshop.
• Contact resistance checks on relays, contactors and switches.
• Cable assembly and harness verification against a limit.
• Calibration shop or lab bench checks against known resistance standards.

For field work away from mains power, the Extech 380580 battery-powered milliohm meter or the portable 380462 is a better fit than the bench-top 380562.

Selection checklist for the 380562

• Confirm the resistance range: 0.01 mΩ to 20 kΩ in seven ranges.
• Confirm mains: 220 V for the 380562 or 110 V for the 380560.
• Decide if the Hi/Lo/Go comparator and automatic zero are needed for repetitive testing.
• Order spare Kelvin clip leads (380465) if the clips are exposed to frequent use.
• Decide whether a NIST-traceable calibration certificate (the -NIST version) is required.

Operating and caring for the 380562

Place the 380562 on a stable bench, connect it to the correct supply and let the display settle. Short the Kelvin leads to confirm a zero reading, then clip them across the part, keeping the voltage clips inside the current clips. Keep the clip jaws clean, avoid pulling on the leads, and never apply external voltage to the measurement terminals. The over-range indication appears when the part is above the selected range, in which case select a higher range.

The instrument is intended for dry indoor conditions up to 80% relative humidity; in a hot workshop, keep ventilation around the case.

Good practice is to log the reading of a known reference resistor at the start of every shift. If the reference drifts outside its tolerance, check the clip jaws for oxidation and the lead connections for looseness before blaming the instrument, and send the meter for calibration when the reference still disagrees. Always record the range used, because the same part reads with a different resolution on a different range.

Applications of the 380562 in Oman and the GCC

Repair and rewind workshops for pump motors, electrical contractors that assemble switchboards, and instrument and calibration laboratories in oil and gas, power and water utilities all use bench milliohm meters for routine checks. Regional workshops often work in hot, dusty conditions, so a covered bench, regular cleaning of the clip jaws and a calibration schedule keep the readings dependable.

Information to send with an RFQ for the 380562

• Part number 380562 and the required quantity
• Resistance range of the parts to be tested
• Supply version needed and whether a comparator is required for sorting
• 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 380562

Store the Extech 380562 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 380562, 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 380562 is attached on this page. It covers the 380560 and 380562 models and their ranges.

Send us the part number 380562, 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.