DO7 Plus Micro Ohmmeter

DO7 Plus Micro Ohmmeter

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Micro Ohmmeter – DO7 plus

The DO7Plus is a 10A Micro ohmmeter, suitable for applications within Aerospace, Utilities, Cable or Machine Manufacturers or where a cooling curve is required to plot peak resistance. This Micro Ohmmeter comes with 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.

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.

Micro Ohmmeter Features DO7 plus:

  • Backlit LCD graphic panel with programmable timer for battery conservation
  • Qwerty Keyboard
  • Temperature compensation via PT100
  • Coefficients for Copper and Aluminum
  • Display length of 60,000 counts
  • Auto Averaging with a forward reverse measurement (removes thermal emf diff)
  • Log Memory can be plotted to calculate peak resistance value at t=0
  • Memory 1000 time stamped readings
  • Software included to view data via download with USB, RS232
  • Ruggedly constructed case IP 67 when lid is closed a d IP53 when lid is open.
  • On-screen, real-time graphical plotting cooling curve facilities with peak resistance value calculator
  • Reading rate of 2 readings per second
  • Measuring ranges from 6mΩ – 6kΩ
  • Resolution 100nΩ on 6mΩ range
  • Single pulse measurement for fast resistance tests
  • Continuous measurement current for inductive tests
  • Full test lead continuity testing and diagnostic display
  • Multilingual – display available in English, French, German, Spanish or Italian


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 50V 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

Resistance measurement

Range Current Resolution FSV Uncertainty
6.0000 mΩ 10 A 100 nΩ 60 mV 0.05% Rdg +0.01%FS
60.000 mΩ 1 A 1 μΩ 60 mV 0.05% Rdg +0.01%FS
600.00 mΩ 100 mA 10 μΩ 60 mV 0.05% Rdg +0.01%FS
6.0000 Ω 10 mA 100 μΩ 60 mV 0.05% Rdg +0.01%FS
60.000 Ω 1 mA 1 mΩ 60 mV 0.05% Rdg +0.01%FS
600.00 Ω 100 μA 10 mΩ 60 mV 0.05% Rdg +0.01%FS
6.0000 kΩ 100 μA 100 mΩ 600 mV 0.05% Rdg +0.01%FS



cropico logo 200 x 200


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