4
RMO200D Functionality
• Do not use RMO200D without the extra protective ground (PE) cable set connected. Always establish
this connection as the first one before you do any other connections, and separate this connection as
the very last one.
Operator Qualifications
• Testing with RMO200D should only be carried out by authorized and qualified personnel.
• Personnel receiving training, instruction, direction or education on the RMO200D should remain under
the constant supervision of an experienced operator while working with the test set and the test object.
Power Supply
• Supply RMO200D only from a power outlet that is equipped with protective ground.
• Instead of supplying RMO200D from phase – neutral (L1-N, A-N), it may also be supplied from phase
– phase (e.g., L1-L2; A-B). However, the voltage must not exceed 240 V AC, please refer to section
Technical Data.
Warning
This is a class A product. In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate measures.
3 Designated Use
The Micro OhmMeter RMO200D is designed for measuring contact resistances of non-inductive test objects
used in the electric power industry or similar branches. It is employed for resistance measurement during
manufacturing, commissioning and testing of:
power circuit breakers,
interrupters,
bar installation,
cable splices,
welded joints,
grounding.
Any other use of the RMO200D than the ones mentioned above is to be considered improper and will not
only invalidate all customer warranty claims but also exempt the manufacturer from its liability for repair or
exchange.
4 Functionality
4.1 Single Test
The RMO200D generates a filtered (true) DC current and outputs it in an automatically regulated current
ramp. The current increases with a constant slope from zero up to a set maximum value. When the current
has reached its maximum, RMO200D measures the resistance of the test object. After test the output
current ramps back down to zero with a constant slope. By sloping the current up and down, magnetic
transients are virtually eliminated.
4.2 Continuous Test
RMO200D can generate DC current continuously using the
Contin
menu. In this menu the current can be
chosen the same way like in the
Single
menu, but the duration of the test can be preset. The test is started
pressing the
START
button. By pushing
Ω
button current test result is stored in internal memory. During the
test, a new result is shown on the display and stored into the PC (DV Win) approximately each second.
