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Rugged digital micro ohmmeter for low resistance measurement

The highly accurate measurement of low resistance is improved with new Digital DO7 Plus Micro Ohmmeter.

Accurate to within 0.05%, lead resistance errors are eliminated with the incorporation of true four-wire technology, while advanced features include seven selectable measurement ranges, extending for 0.1µΩ to 6kΩ.

The DO7Plus is a 10A microhmmeter, suitable for applications within Aerospace, Utilities, Cable or Machine Manufacturers or where a cooling curve is required to plot peak resistance. Sealed in an IP67 case (when closed or IP53, lid open) it is ruggedly constructed to ensure durability.

The DO7Plus micro ohmmeter has a backlit LCD graphics panel, full QWERTY keyboard, temperature compensation via optional PT100 probe, and built in coefficients for Copper and Aluminium as well as user defined. Full cooling curve facilities are built in, with real time graphical plotting on the LCD. Data log memory contents can be plotted and a curve fitted to calculate the peak resistance value when t=0.

This micro ohmmeter has a display length of 60000 counts and auto averaging of forward and reverse measurement removes thermal emf differences. Connectivity is improved with both USB and RS232 for data downloading. The internal memory holds up to 1000 date and time stamped readings and which can be viewed on the LCD or downloaded with the free software provided, as CSV file to a PC for further analysis.

The data log memory using the latest FRAM technology which offers unlimited read/write cycles and over 10 years of data retention, without relying on internal batteries.

he DO7Plus microhmmeter has built in rechargeable batteries which will provide up to 1 hour of continuous use at 10A, and up to 20 hours at all other ranges.

Technical Specification for the DO7 Plus digital micro ohmmeter

Measurement:
4 terminal Kelvin / Thompson principle eliminates errors due to lead resistance

Display:
60,000 count + sign LCD graphics panel with backlight
Select display value of °C or °F

Ranges:
7 resistance ranges

Terminals:
4mm safety sockets

Working temperature:
0 deg C to 40 deg C

Storage Temperature:
-20 deg C to +50 deg C

Safety:
Conforms to EN 61010-1:2001 600V Cat 3

Dimensions and weight:
358mm X 269mm X 155mm

Mass:
<5Kg (instrument only)

Calibration:
Digital
Password protected, manual or via remote interface

Battery:
Internal, fixed NiMh battery pack, Gas Gauge circuits to monitor
battery capacity. Internal automatic FAST / TRICKLE battery
Charger. DC input from 9V to 36V.

Mains Supply:
External mains psu 90V - 253V, 47Hz to 63Hz with interchangeable plugs.