Milliohmmeters / Microhmmeters
The milliohmmeters and microhmmeters measure very low resistance values with high accuracy, typically between 1 µΩ and 10 kΩ. Based on the four-wire Kelvin method, they eliminate the effects of contact and cable resistance to guarantee accuracy of up to ± (0.02 % + 2 µΩ). In R&D, they are used to characterise connectors, fuses, printed circuit tracks or solder joints. In production, they check the continuity and quality of electrical and mechanical assemblies. In maintenance, they are used to detect hot spots and contact damage in power equipment. Portable models are suitable for on-site testing, while bench-top versions offer greater metrological stability. Some instruments feature automatic triggering, temperature compensation and statistical averaging. USB, LAN or GPIB interfaces facilitate traceability to ISO 17025.
These precision tools are essential for checking low resistances and the reliability of electrical connections.
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92B
BOONTON
Precise, easy-to-use RF 92B millivoltmeter, ideal for measurements up to 1.2 GHz.
9200A
BOONTON
RF millivoltmeter measuring from 200 µV to 3 V in the 10 KHz to 1.2 GHz range.
3586A
KEYSIGHT
Selective voltmeter synthesised with impedances of 75, 150 and 600 Ohms.
URV-Z7
ROHDE & SCHWARZ
RF probe for use with R+S URV, frequency from 100 kHz to 1000 MHz.
CA6292
CHAUVIN ARNOUX
200 A programmable micro-ohmmeter with 0.1 µΩ resolution and IP54 enclosure.
URVD
ROHDE & SCHWARZ
Measuring device with two channels for attenuation and reflection.
9200
BOONTON
RF voltage measurement from 200 µV to 3 V in the 10 KHz to 1.2 GHz range.
concrete questions about Milliohmmeters / Microhmmeters
01
What is the main function of these instruments?They measure very low resistances, in the milliohm or microohm range, often where contact or connection resistance can cause overheating, loss or failure.
02
How do they get such a precise measurement?Using the 4-wire (Kelvin) method, which eliminates errors associated with test lead resistance. Some models inject high currents (up to 10 A or more) to improve resolution.
03
What types of objects are they used on?Power connections, earth bars, welded cables, relay contacts, motor or transformer windings, distribution rails... any element where low resistance needs to be controlled.
04
What precautions should be taken?It is important to ensure that there is good contact with the Kelvin points, that there is no oxidation or vibration, and that the object under test is de-energised. Environments with low electrical noise are preferable for stable measurements.
05
Are there versions suitable for test benches?Yes, some benchtop microhmmeters offer automatic triggers, programmable cycles, PC interfaces and binary outputs for integration into production lines or validation benches.
