High Current (100A) Portable Micro-Ohmmeter 5897
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 0.1µOhm 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-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.
General
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.
Control Functions
- 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
Specifications
See the table below for a run-down of this product's specifications.
Range | Resolution | Current | Accuracy | Temperature Coefficient | |
% reading | last digits | ||||
| 400µΩ | 0.1µΩ | 100A/25A | +/-0.4% | +4 | (0.05% +4)/ °C |
| 4000µΩ | 1.0µΩ | 100A/25A | +/-0.2% | +4 | (0.04% +0.2)/ °C |
| 40µΩ | 10 µΩ | 10A/2.5A | +/-0.2% | +4 | (0.02% +0.1)/ °C |
| 400µΩ | 0.1µΩ | 1A/0.25A | +/-0.2% | +4 | (0.02% +0.1)/ °C |
| 4µΩ | 1.0µΩ | 100mA/25mA | +/-0.2% | +4 | (0.02% +0.1)/ °C |
| 40µΩ | 10 µΩ | 10mA/2.5mA | +/-0.2% | +4 | (0.04% +0.2)/ °C |
