Figure - Megger OTS 60PB Guide De L'utilisateur

Operation
ASTM D877 tests
1. On pressing the 'START' key 'TEST 1' is initiated and the display screen appears similar to that
shown in figure 5.
The sub-display area indicates that the initial stand time of 2 min 20 s for the oil sample is being
undertaken and the time is being counted down to zero.
2. After the initial stand time is complete the high voltage is switched on and applied to the oil sample.
The screen display appears similar to that shown in figure 6.
The sub-display shows the voltage applied to the oil sample; this voltage is rising at the rate of 3 kV/s.
It continues until breakdown occurs (or up to maximum). The high voltage warning light is illuminated
during this time. The number of the test in the sequence is shown and the words 'IN PROGRESS'
appear.
3. When breakdown occurs (or if the maximum voltage is reached) the test voltage is cut off, the 'kV'
warning light goes out and the test set begins its oil sample intermediate stand period of 1 minute.
There is no stirring period. The display screen appears similar to that in figure 8.
4. When the intermediate stand time has finished the test voltage begins to rise again as in step (2)
above, this time for 'TEST 2', and the cycle of events repeats.
5. For this specification there are 5 consecutive tests. After the test voltage has been cut off on the last
test, the display screen shows the average breakdown voltage value from the 5 tests in the
sequence. The display screen appears similar to that in figure 9 or figure 10 if the PASS/FAIL option
is enabled.
The three control keys now assume different functions. Press the left hand key labelled 'VIEW' to
bring back into view, sequentially, the breakdown voltage values of each individual test and the
average value in turn.
Press the 'NEW' key to return to the start of the selected test sequence. Press the left hand 'START'
key to repeat a test sequence or the 'MENU' key to return to the main menu.
Note:– At any time during a test sequence the right hand control key, labelled 'STOP', can be used to
end a test and return to the initial test screen.
ASTM D1816 tests
1. On pressing the 'START' key 'TEST 1' is initiated and the display screen appears similar to that
shown in figure 5. The stirrer operates and continues to do so throughout the test sequence. The sub-
display area indicates that the initial stand time of 3 minutes for the oil sample is being undertaken
and the time is being counted down to zero.
2. After the initial stand time is complete the high voltage is switched on and applied to the oil sample.
The screen display appears similar to that shown in figure 6.
The sub-display shows the voltage applied to the sample oil; this voltage is rising at the rate of
0,5 kV/s. it continues until breakdown occurs (or up to maximum). The high voltage warning light is
illuminated during this time. The number of the test in the sequence is shown and the words 'IN
PROGRESS' appear.
3. When breakdown occurs (or if the maximum voltage is reached) the test voltage is cut off, the 'kV'
warning light goes out and the test set begins its oil sample intermediate stand period of 1 minute.
The display screen appears similar to that in figure 8.
4. When the intermediate stand time has finished the test voltage begins to rise again as in step (2)
above, this time for 'TEST 2', and the cycle of events repeats.
5. For this specification there are 5 consecutive tests. After the test voltage has been cut off on the last
test, the display screen shows the average breakdown voltage value from the 5 tests in the
sequence. The display screen appears similar to that in figure 9 or figure 10 if the PASS/FAIL option
is enabled.
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