18
RMO60TD Getting Started
Discharge Current
The voltage at the RMO60TD output generation is immediately stopped, but current still flows, because
of the inductivity of test objects.
Because of the enormous amount of energy that can be stored in a magnetic field, precautions should
be taken before disconnecting the test leads from the transformer that is under test. Never remove the
leads during the testing process and always allow enough time for the transformer being tested to
completely discharge. Large transformers can require several minutes to discharge.
C A U T I O N
DO NOT DISCONNECT LEADS BEFORE “DISCHARGING” MESSAGE DISAPPEARS FROM
THE DISPLAY AND THE DISCHARGING DIODE AND BUZZER ARE OFF.
Note:
Using DV-Win the results could be stored to PC, where reading interval results is adjustable. Results will
be shown in a table in Excel format with an option to perform additional edit and graphic presentation.
Using DV-Win after the test in order to transfer the results from selected internal memory location to PC
will allow transfer of the last test result only.
Using DV-Win software it is possible to draw a graph which represent dynamic resistance during the
change from tap to tap (refer to section 7.6).
6.3 Demagnetization feature
Note:
Before using the demagnetization feature, you must unplug the voltage sense cables from the
device.
After the test is done, there is a feature to demagnetize the transformer under test.
To do so, press
SET
consecutively until the
DEM
menu is selected. Once you are in the
DEM
menu, you
can select the starting current for the demagnetization process by pressing
UP/DOWN
. We recommend
that the starting current is the same as what was used for the measurement of the transformer under
test. Therefore, the test current used for the last test is displayed as default.
When the current is selected, press
ENTER
to confirm selection.
Press
START
to start the demagnetization process. The demagnetization of the transformer under test
will be carried out automatically. It is necessary to disconnect the voltage sense cables before the
Figure 6-18:
Message
"Discontinuity"
Figure 6-19:
Demagnetization
starting current"
Figure 6-20:
The “Ready” state
before the test
