Megger OTS 60AF/2, User Manual

Page: 15 / 104

5 MINUTE TEST
Note:-
This is a non-standard test, designed to provide a rapid assessment of the oil condition.
1. To commence the test, highlight 5 MINUTE TEST on the main menu and press select. The
display will appear similar to figure 6.
Repeated pressing of the centre key marked STIRMODEchanges the stirring choice through
MAGNETIC, IMPELLER or NONE. Press the right hand key marked MENU to return to the main
menu.
2. On pressing the START key the display appears similar to figure 7.
The display indicates that the one minute initial stand time is being undertaken, and the
remaining time is shown in seconds.
3. After the initial stand time is complete the high test voltage is automatically switched on and
applied to the sample. The display showing ‘TEST 1’ appears similar to figure 8.
The high voltage indicator light is illuminated, and the display shows the voltage rising at the rate
of 2kV/s being applied to the oil sample. This voltage rise continues until break down occurs (or
up to maximum). The number of the test in the sequence is displayed, together with the words
‘IN PROGRESS’.
Figure 8. Applied voltage display screen.
Figure 7. Initial stand time display screen.
15
TIME REMAINING
01:00
INITIAL STAND TIME
STOP
5 MINUTE TEST
XX kV
TEST 1
IN PROGRESS
STOP
5 MINUTE TEST
5 MINUTE TEST
STIR MODE
MENU
START
STIRRING: MAGNETIC
2.5
mm
Figure 6. Initial Stir Mode selection display screen.