Milliohm Meter

3 products

The Milli-Ohm Meter Collection offers high-precision instruments that measure extremely low resistance values—along the order of microohms to milliohms. Essential for evaluating welded joints, busbars, battery connections, and EMI test benches, these meters use four-wire Kelvin measurement to eliminate lead resistance errors. Designed for durability and stable output even under thermal variance, they serve industries such as electrical manufacturing, automotive testing, and lab metrology, where ultra-low resistance readings are critical.

Frequently Asked Questions

This is usually due to "Lead Resistance" interference or poor Kelvin clip contact. In sub-ohm measurements, the resistance of the test leads themselves can exceed the resistance of the component. Calibration verifies that the meter’s "Null" and "4-Wire" (Kelvin) compensation circuits are accurately subtracting lead resistance to show only the true low-ohm value.

When two dissimilar metals meet at different temperatures (like a probe and a terminal), they create a tiny battery-like voltage (Electromotive Force). Because milliohm meters use very low test voltages, this "noise" can skew the reading by 10% or more. We verify that your meter’s "Offset Compensation" or "Polarity Reversal" features are correctly canceling out these thermal voltages.

Yes. If the internal relay or external Kelvin clips have microscopic oxidation, the meter will struggle to stabilize. During service, we test the "Current Drive" stability; if the meter cannot maintain a steady test current (e.g., 10A or 100mA), it indicates high contact resistance within the instrument's own signal path.

Measuring a transformer winding or a large motor is different from measuring a resistor because of stored energy (inductance). We certify that your meter’s "Auto-Discharge" and "Inductive Mode" algorithms work correctly, ensuring the meter doesn't "jump" to a final value before the magnetic field has stabilized.

Absolutely. A meter might be accurate at 100mA but drift at 10A due to internal "Shunt Heating." We perform multi-range calibration, testing the meter at high-current outputs to ensure internal components aren't heating up and causing a mid-test resistance shift (Thermal Drift).

In lightning protection or aircraft bonding, a difference of 0.005 ohms can be the difference between a safe dissipation and a fire hazard. Professional certification provides the traceable millivolt/ampere ratio verification required to meet Australian aerospace and safety standards.