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5897 An accurate mains/battery powered portable 100A Micro Ohmmeter.
Using the 4 terminal measurement technique the 5897 gives basic accuracy of 0.2% and an overall
resistance range of 0.1 µΩ to 40 Ω.
With an internal mains re-chargeable battery supply the 5897 Micro Ohmmeter may be used “in the field” for
periods of up to 8 hours without requiring recharging. A standard RS232 computer interface is included.

High current Micro-ohmmeter

Model  Description 
5897  5897 High current Micro-ohmmeter. 100 Amp.

The 5897 Micro Ohmmeter can be used fully auto-ranging or with manual range selection if required.
Each of the 6 ranges has a choice of high or low measuring current.
Current can be selected to be positive or negative, with the option of automatic reversal to
eliminate the effect of thermal E.M.F.'s.

The 100A current is pulsed with a duty cycle of approximately 10%.
Measurement value displayed continuously.
Power supplies. Two internal, re-chargeable, sealed, lead acid batteries are fitted for external 100A test
resistance current and internal measurement supply circuits.
Two charge indicators show the state of charge. The built-in battery charger has a front panel mains input
supply for 115v or 230V supply with fuses.
Digital display A 4 digit 4000 count display provides resolution to 0.025% of full scale reading in a bright
daylight viewing 20mm high LED display.

Micro ohmmeter specification
High current micro-ohmmeter
Range  Resolution  Current  Accuracy  Temperature
(%reading + last digit) 
% reading  Last digits 
400  µΩ 0.1 µΩ 100A/25A  +/-0.4%  +4  (0.04% +0.2)/ °C 
4000 µΩ 1.0 µΩ 100A/25A  +/-0.2%  +4  (0.02% +0.1)/ °C 
40 mΩ 10 µΩ 10A/2.5A  +/-0.2%  +4  (0.02% +0.1)/ °C 
400 mΩ 0.1 mΩ 1A/0.25A  +/-0.2%  +4  (0.02% +0.1)/ °C 
4 Ω 1.0 mΩ 100mA/25mA  +/-0.2%  +4  (0.02% +0.1)/ °C 
40 Ω 10 mΩ 10mA/2.5mA  +/-0.2%  +4  (0.02% +0.1)/ °C