Cropico DO7

Rugged digital micro ohmmeter for low resistance measurement

  • True 4 terminal, or Kelvin, measurement eliminates lead resistance errors
  • 10 Amp measuring current
  • Rechargeable batteries with built-in charge
  • Measuring range 600 micro ohm to 60 ohm
Cropico DO7

Cropico DO7

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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. Built-in battery charge indicators. The internal charger will charge to 90% of full charge, then switch 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 power cord and test leads, no extras are normally necessary.

For special lead sets we offer a variety of different styles which are listed on the accessories page, together with calibration standards.

Cropico DO7

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Technical specification

Measurement 4 Terminal Kelvin/Thomson principle eliminates error due to lead resistance. Open circuit measurement voltage~2V dc
Display 0.8" LED 6,000 count with automatic decimal point and polarity indication
Ranges 6 push button selected with LED indication
Calibration Digital, security key protected
Protection 415rms maximum at input terminals
Battery 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
Terminals 6mm binding posts accept spade tags and 4mm banana plugs
Working Temp 0...40°C rel. humidity 80% max. non-condensing
Storage Temp -20...+50°C
Mains Supply 100/120/220/240 Volts +10% -13% 47Þ63Hz 20VA
Safety IEC 1010 Protective Class 1
EMC Complies with EN61326
Dimensions 343 x 327 x 152mm (W D H) approx
Mass 8 kg approx
Accessories Supplied complete with mains cord, measuring leads with Kelvin Clips, handbook and calibration certificate

Resistance ranges

Range Resolution Typical current Accuracy @ 20°C ±5 °C, 1 year Temperature Coefficient / °C
60Ohm 10mOhm 1mA ±(0.15% Rdg +0.05% FS) 40 ppm Rdg + 30 ppm FS
6Ohm 1mOhm 10mA    



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