9
RMO30T Getting Started
6 Getting Started
6.1 Current test
Connecting a Test Object to the RMO30T
Before you connect a test object to RMO30T, make sure that:
• The test object is disconnected or separated from its circuit in accordance with the national safety
regulations and is properly grounded to protective earth.
• RMO30T itself is properly grounded. To do so, connect the grounding screw on the back of
RMO30T’s to PE using a grounding cable.
• One end of measured windings is properly grounded.
• See example of a two channel setup in the figure below (6-1).
C A U T I O N
FOR SAFETY REASONS, ALWAYS ESTABLISH A CONNECTION OF THE DEVICE WITH
TEST OBJECT IN THE WAY AS DESCRIBED IN THE FIGURE 6-1.
DO NOT CONNECT MEASURING CABLES AFTER TEST STARTS.
DO NOT DISCONNECT ANY LEADS BEFORE THE LED DISCHARGE AND THE BUZZER
ARE OFF.
The Figure 6-2 shows simultaneous testing of both windings (high and low) on a single-phase
transformer. In such a way, it is possible to speed up the measurement when two channels are used to
test both windings of the transformer.
When performing a two channel measurement; connect the Current connection cable as in the
example below (Figure 6-2.) and outside the Sense leads.
Figure 6-1:
Connecting a test
object to RMO30T
With RMO30T turned off, connect RMO30T to
the test object in such a way that the measuring
cables from the "Voltage Sense" sockets are
attached as close as possible to R
X
, and in
between the current feeding cables. That way,
resistance of both cables and clamps is almost
completely excluded from the resistance
measurement.
Pay attention to polarity while
connecting measuring cables.
To maximize accuracy and measurement
repeatability; make sure that all clamps have a
good connection to the test object and avoid
any connection between Sense and Current
clamps.
