Micro-Ohmmeters
Micro-ohmmeters are devices that measure very low resistances at the micro-ohm and milliohm level by the four-wire (Kelvin) method. They are used to measure contact resistance at busbar and cable lug connections and at switch and contactor contacts, and winding resistance in motor and transformer windings. The category includes the Unit UT620A, UT620B and UT620C digital micro-ohmmeters with rechargeable batteries and the UT3513+ and UT3516+ DC resistance testers; the product data includes 1 µΩ and 10 µΩ resolution, 5 A and 10 A test current steps, cable length measurement, upper and lower limit alarms and USB data transfer. Compare the smallest resolution and measuring range for the resistance level you will measure, the test current, accuracy, battery-powered field type or benchtop construction, and record memory and data transfer. Because the current and voltage leads are separate in a four-wire connection, the resistance of the measuring leads and contact points does not affect the result. The two-wire ohm range of a multimeter does not replace a micro-ohmmeter because it adds probe and contact resistance to the measurement.
Products
- Unit UT620A Digital Micro-Ohmmeter — Unit · SKU: UT620A · TRY 24,211.29 · Made to order
- Unit UT3513 1μΩ-20kΩ 0.1% Accuracy 4.3-inch DC Micro Ohm Meter — Unit · SKU: UT3513 · TRY 21,698.80 · Made to order
- Unit UT620T 10A Four-Wire Transformer DC Resistance Tester — Unit · SKU: UT620T · TRY 45,681.68 · Made to order
- Unit UT620C+ 0.001 mΩ – 300 kΩ IP54 Micro-ohmmeter — Unit · SKU: UT620C+ · TRY 21,470.39 · Made to order
- Unit UT625B 200A 0.1 μΩ – 2000 mΩ Low Resistance Ohmmeter — Unit · SKU: UT625B · TRY 118,772.37 · Made to order
- Unit UT3516 1μΩ-2MΩ 0.05% Accuracy 4.3-inch DC Micro Ohm Meter — Unit · SKU: UT3516 · TRY 36,545.34 · Made to order
- Unit UT3515-S20 Multi-Channel Scanning 1μΩ-2MΩ 0.05% Accuracy DC Micro Ohm Meter — Unit · SKU: UT3515-S20 · TRY 102,783.78 · Made to order
- Unit UT3515-S10 Multi-Channel Scanning 1μΩ-2MΩ 0.05% Accuracy DC Micro Ohm Meter — Unit · SKU: UT3515-S10 · TRY 75,374.77 · Made to order
- Unit UT3513+ DC Micro Ohm Meter - Resistance Tester — Unit · SKU: UT3513+ · TRY 22,840.84 · In stock
- Unit UT3516+ DC Micro Ohm Meter - Resistance Tester — Unit · SKU: UT3516+ · TRY 38,829.43 · Made to order
How to choose Micro-Ohmmeters
Micro-ohmmeters are devices that measure very low resistances at the micro-ohm and milliohm level by the four-wire (Kelvin) method. They are used to measure contact resistance at busbar and cable lug connections and at switch and contactor contacts, and winding resistance in motor and transformer windings.
- Identify the measurement or fastening task and the required insulation safety rating.
- Select jaw profile, cross-section range and accessories for the conductor or fastener standard.
- Check CAT voltage category and replacement tip or die availability for field conditions.
Frequently asked questions
What is Micro-Ohmmeters and where is it used?
Micro-ohmmeters are devices that measure very low resistances at the micro-ohm and milliohm level by the four-wire (Kelvin) method. They are used to measure contact resistance at busbar and cable lug connections and at switch and contactor contacts, and winding resistance in motor and transformer windings.
What should I compare when choosing Micro-Ohmmeters?
Compare the smallest resolution and measuring range for the resistance level you will measure, the test current, accuracy, battery-powered field type or benchtop construction, and record memory and data transfer.
Where can I find technical details for Micro-Ohmmeters products?
Because the current and voltage leads are separate in a four-wire connection, the resistance of the measuring leads and contact points does not affect the result.