DRM-40 Micro-ohmmeter
The DRM-40 micro-ohmmeter can be used to measure very low resistances which vary from 
0,01micro ohm to 200 ohm. 
Its very wide precision range enables the user to accomplish a great variety of measurements without having to own many instruments.
The DRM-40 uses the four-pin resistance measurement system, which consists of injecting a current with two cables connected at each end of the joint to be tested. Then, the cables are installed which allow to read the tension on each side of the part to be tested in order to measure the resistance.

• Quality control of the smelting parts

• Control of the mechanical joints and of the joints welded at high voltage

• Control of the exothermal joints (Caldwell)

• Control of the electrodes for the aluminum
  plants

• Inspection of the contacts, the circuit 
  breakers and the power fuses

The DRM-40 uses the four-pin resistance measurement system, which consists of injecting a current with two cables connected at each end of the joint to be tested. Then, the cables are installed which allow to read the tension on each side of the part to be tested in order to measure the resistance. 
This eliminates any uncertainty linked to resistance of the contacts. The instrument is equipped with a microprocessor which allows to eliminate the gaps and parasite voltages. 
Thanks to its unique filtering system, the DRM-40 can be used in spite of the presence of intense magnetic fields.

Technical specifications

Uses the four point measuring method
Displays three measurement currents of 5A, 250mA and 5mA which automatically adjust themselves
Automatic stop mechanism of the instrument after 2 min. in idle mode
Automatic stop mechanism of the backlighting system after 30 sec.
The LCD (Liquid Crystal Display) displays the results in big letter casings that are easy to read.
A set of standard connecting cables with "alligator" pliers comes with the instrument.