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Model 5897 Portable 100A Precision Micro-Ohmmeter

An accurate mains/battery powered portable 100A Micro-Ohmmeter. Using the 4 terminal measurement technique the Tinsley 5897 gives basic accuracy of 0.2% and an overall resistance range of 0.1 µOhm to 40 Ohm.

With an internal mains re-chargeable battery supply the Tinsley 5897 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. The Tinsley 5897 Portable Micro-Ohmeter 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.

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Features
Control Functions
Specifications

Measurement principle

A Kelvin, four terminal, measurement principle to eliminate lead resistance. 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

Mechanical

A rugged, portable sealed ABS case, coloured grey. Size 460 x 380 x 160mm. Net Weight Approx 17kg

Calibration

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

6 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

Measurement Specifications

Range: 400 µΩ
Resolution: 0.1 µΩ
Current: 100 A / 25 A
Accuracy: ±0.4% (+4 digits)
Temperature Coefficient: (0.05% + 4 digits) per °C

Range: 4000 µΩ
Resolution: 1.0 µΩ
Current: 100 A / 25 A
Accuracy: ±0.2% (+4 digits)
Temperature Coefficient: (0.04% + 0.2 digits) per °C

Range: 40 µΩ
Resolution: 10 µΩ
Current: 10 A / 2.5 A
Accuracy: ±0.2% (+4 digits)
Temperature Coefficient: (0.02% + 0.1 digits) per °C

Range: 400 µΩ
Resolution: 0.1 µΩ
Current: 1 A / 0.25 A
Accuracy: ±0.2% (+4 digits)
Temperature Coefficient: (0.02% + 0.1 digits) per °C

Range: 4 µΩ
Resolution: 1.0 µΩ
Current: 100 mA / 25 mA
Accuracy: ±0.2% (+4 digits)
Temperature Coefficient: (0.02% + 0.1 digits) per °C

Range: 40 µΩ
Resolution: 10 µΩ
Current: 10 mA / 2.5 mA
Accuracy: ±0.2% (+4 digits)
Temperature Coefficient: (0.04% + 0.2 digits) per °C

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