MOM600A
Micro-ohmmeter

Overview

   Compact and tough

The risk of overheating is becoming more serious due to the fact that today's distribution networks have to carry heavier loads. Checking contact resistances at regular intervals detects faults before they cause overheating.

Microhmmeters are used to measure contact resistances in highvoltage breakers, disconnecting switches (isolators), knife-contact fuses, bus joints, line joints etc. 

Specifications
Specifications are valid at nominal input voltage and an ambient  temperature of +25°C, (77°F). Specifications are subject to change without notice.

Measurement section
Printed matter:
                      Range 0 – 1999 μΩ
                      Resolution 1 μΩ
                      Inaccuracy ±1% of reading + 1 digit
                                      (at 100 – 600 A test current)

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Output, 115 V model
Current 0 – 600 A DC
Open circuit voltage 5.2 V DC
Current shunt output 10 mV / 100 A ±0.5%, max 60 mV out, max 10 V to protective earth (ground)

​
Output, 230 V model
Current 0 – 600 A DC
Open circuit voltage 9 V DC
Current shunt output 10 mV / 100 A ±0.5%, max 60 mV out, max 10 V to protective earth
(ground)

​
Max. load capacity, 115 V model
Current adjustment set to 100%
Output current       Min.                           Max.              Rest              Input current
                             ​output                       load               time
                             voltage                      time
100 A DC                4.6 V                          -                   -                   8 A
300 A DC                3.8 V                       1.5 min.            15 min.           20 A
600 A DC                2.6 V                       10 s                  5 min.            38 A

​
Max. load capacity, 230 V model
Current adjustment set to 100%​

Output current       Min.                           Max.              Rest              Input current
                             ​output                       load               time
                             voltage                      time
100 A DC                8.3 V                          -                   -                   6 A
300 A DC                7.2 V                       2.5 min.            15 min.           16 A
600 A DC                5.6 V                       15 s                  5 min.            32 A