10
RMO60TD Getting Started
6
Getting Started
6.1 Current test
Connecting a Test Object to the RMO60TD
Before you connect a test object to RMO60TD, 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.
• RMO60TD itself is properly grounded. To do so, connect the grounding screw to PE using a
grounding cable.
• One end of measured windings is properly grounded. An only exception is the case when YN
connection is tested and Neutral and Earth bonds are connected between each other. Only in this
case one side of the measurement circuit must not be earthed because it is not necessary and it will
affect the RMO60TD reading incorrectly.
• 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 RMO60TD
With RMO60TD turned off, connect RMO60TD
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.
