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Cropico DO7 Plus Micro Ohmmeter
Rugged Digital Microhmmeter for low resistance measurement, with built in temperature compensation

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 microhmmeter 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 microhmmeter 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.T

The 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.

Key Features

  On screen real time graphical plotting cooling curve facilities with peak resistance value calculator
  It's fast, reading rate of 2 readings per second
  Measuring ranges from 6 mohm to 6 Kohm
  Resolution 100 nohm to 6 mohm range
  Backlit LCD graphic panel with programmable timer for battery conservation
  Single pulse measurement for fast resistance tests
  Continuous measurement current for inductive tests
  Full test lead continuity testing and diagnostic display
  Multi lingual - Display available in English, French, German, Spanish or Italian

Data Sheet



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


60,000 count + sign LCD graphics panel with backlight. Select display value of degC or degF


7 resistance ranges


4mm safety sockets

Working Temperature

0 deg C to 40 deg C

Storage Temperature

-20 deg C to +50 deg C

Mains Supply

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


Conforms to EN 61010-1:2001 50V Cat 3


358mm X 269mm X 155mm


<5Kg (instrument only)


Digital, password protected, manual or via remote interface


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

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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