PORTABLE MICRO-OHMMETER

5898 Portable Micro-Ohmmeter 200 Amp.
An accurate mains/battery powered portable 200A  Micro-Ohmmeter. 
Using the 4 terminal measurement technique the 5898 Micro ohmmeter gives basic accuracy of 0.2% and an overall resistance range of 0.1 µΩ to 6 Ω.
With an internal mains re-chargeable battery supply the Tinsley 5898 may be used “in the field” for periods of up to 8 hours without requiring recharging. A standard RS232 computer interface is included that may be used for printing resistance values or downloading measurements that have been 
stored in the instrument’s memory. 

Portable Micro-Ohmmeter

The 5898 portable 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 with the exception of the lowest range, which is fixed at 200 Amps. 

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.

Model 5898 Micro-Ohmmeter Control functions

• 5 measuring range controls (manual selection)

• AUTO key for auto range

• High/Low current control

• 3 Current direction measurement controls.
  + direction
  - direction
  Alternate (automatic reversal of + and -to eliminate thermal e.m.f. errors in measuring circuit)

• Supply ON/OFF

• Measure key

• Print key

• Calibration (CAL) control. Enables instrument internal reference standards to be calibrated by applying a set of external reference standards

• Menu/Enter key to access additional functions

• Time and date

• Print mode

• Baud rate

• Data logging mode

• RS232 for data and printer output

• 4 large 200A rated input terminals

• Mains input charging socket

• 2 battery charge indicators

Micro-Ohmmeter measurement principle

A four terminal measurement principle to eliminate lead resistance.
The 200A 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 200A 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 6000 count display provides resolution to 0.015% of full scale reading in a bright daylight viewing 20mm high LED display

Mechanical

A rugged, portable sealed ABS case, colored gray
Size   460 x 380 x 160 mm
Net Weight Approx 20Kg

Calibration

Provided with an in-house Tinsley Calibration Certificate traceable to National Standards via NPL

Micro-Ohmmeter specifications
Range	Resolution	Current	Accuracy		Temperature Coefficient (%reading + last digit)
			% reading	Last digits
600µΩ	0.1µΩ	200A/50A	+/-0.4%	+6	(0.04% +0.2)/ °C
6000µΩ	1.0µΩ	200A/50A	+/-0.2%	+6	(0.02% +0.1)/ °C
60mΩ	10µΩ	20A/5A	+/-0.2%	+6	(0.02% +0.1)/ °C
600mΩ	0.1mΩ	2A/0.5A	+/-0.2%	+6	(0.02% +0.1)/ °C
6Ω	1.0mΩ	200mA/50mA	+/-0.4%	+6	(0.04% +0.2)/ °C