Operation Manual

8 GMC-I Messtechnik GmbH
4 How to test measuring instruments
for low-ohmic resistances
The ISO-Kalibrator 1 permits ohmmeters for low-ohmic resis-
tances to be tested for their function and accuracy.
Two precision resistors are available for instruments with a
measuring current of less than 1.5 A DC or AC:
•1  precision resistor (sockets B1 and B2)
•50 m precision resistor (sockets B3 and B4)
Caution!
!
The 50 m resistor (sockets B3 and B4) must
exclusively be used for measuring instruments with
a nominal measuring current of 10 A.
Caution!
!
By no means must the 1  resistor be used with
measuring currents of more than 2.0 A as this could
cause the resistor to be destroyed or its accuracy to
be impaired.
The use of the 1  resistor with a measuring current
of 10 A or higher causes an instant destruction of
the test resistor in any case. Should this happen, the
tester must immediately be taken out of service as
the safety of the user and also the accuracy of the
other test resistors is no longer guaranteed.