Seaward Cropico DO7 Rugged digital micro-ohmmeter for low resistance measurement.

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The DO7 digital micro-ohmmeter is a practical instrument for low resistance measurement, ideal for utilities use in the workshop, field or test facilities. It is of rugged construction, contained in a sealed ABS plastic case with lid and carrying handle.

The DO7 digital micro-ohmmeter has many advanced features. Rechargeable batteries means real portability with more than 1 hour of continuous operation on the lowest ranges(10A), and 20 hours on all others. 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.

  • High accuracy from 600 micro-ohms to 60 ohms ranges
  • LED display for daylight viewing
  • Mains / rechargeable battery operation

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 415 vrms 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