How to Use Resistance Meters: Measuring Contact Resistance with the Low Power Resistance Function
IEC standards define the method by which to measure the contact resistance of connectors and relays used for very low signals. The Hioki RM3545 Resistance Meter meets those standards with its low power resistance function, also known as the dry circuit test. To reduce the effects on any deteriorating contact surface, the open terminal voltage is capped at 20mV, while the maximum measurement current never exceeds 1mA, delivering the ideal testing environment for measuring contact resistance from the 0.1μΩ to 1kΩ range.
How to Use Resistance Meters: Compensating for the Effect of Electromagnetic Force
When measuring low resistance, due to the voltage generated when different metals come into contact with one another (known as electromagnetic force, or EMF), the measurement values can be unstable. The Hioki RM3545 is built in with an Offset Voltage Compensation (OVC) function to correct for the effects of EMF, making the instrument ideal for measuring low resistance of the welding points of busbars.
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