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Cropico DO7 Micro Ohmmeter

The DO7 is a practical instrument for low resistance measurement, ideal for use in the workshop, field or test facilities.

It is of rugged construction in a sealed ABS plastic case with lid and carrying handle. The DO7 has many advanced features, including protection up to 415 volts rms at the measuring terminals, digital calibration and long scale length, 6000 count.

Rechargeable batteries mean real portability with more than 1 hour of continuous operation on the lowest ranges, and 20 hours on all others. Battery charge indicators are provided. The internal charger will boost charge to 90% of full charge, switching automatically to a trickle maintenance charge.

Warning LEDs illuminate when an open circuit lead condition is detected. A front panel socket provides a serial RS232 output for connection to an external printer or PC, and a socket is also provided for the connection of an external start switch, e.g. a foot switch.

The DO7 is supplied ready for use with batteries, mains cord and test leads, no extras are normally necessary. For special lead sets we offer a variety of different styles.

Key Features

  10 Amp measuring current
  Rechargeable batteries with built-in charger
  Measuring range 600 micro ohm...60 ohm
  Resolution 0.1 micro ohm on 600 micro ohm range
  0.8" LED display daylight viewable
  Auto average of forward and reverse measurement
  Remote start socket
  All solid state design
  Wide range of leads and accessories available
  True 4 terminal measurement eliminates lead
  resistance errors
  RS232 printer output

Data Sheet



4 Terminal Kelvin / Thomson principle eliminates errors due to lead resistance. Open circuit measurement voltage = 2V dc


0.8" LED 6000 count with automatic decimal point and polarity indication


6 push button selected with LED indication


6mm binding posts accept spade tags and 4 mm banana plugs

Working Temperature

0degC to 40degC rel. humidity 80% max. non-condensing

Storage Temperature

-20 to +50 degC

Mains Supply

100 / 120 / 220 / 240 Volts
+10% - 13% 47Hz to 63Hz. max 80VA


IEC 1010 Protective Class 1


343mm x 327mm x 152mm (W D H) approx


8kg approx


415 Vrms maximum at input terminals


Digital, security key protected


Sealed lead acid, rechargeable cells giving a minimum of 1 hour of continuous measurement on the lowest 10 amp ranges and 20 hours on all other ranges. Internal charger with battery state indicator


Automatic average and display of measurement with forward and reverse current

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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