Monroe Electronics Charge Plate - Monitor - model 288B - Manual (Page 13)

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of the display will flash, which signifies that the average voltage computation has overflowed
and is no longer updating based on new data. The instrument continues to correctly indicate
changes to the positive and negative peak voltages, +Vp and –Vp, respectively.
Confidence Test – One of the major weaknesses in all CPM’s has been the inability to
properly verify the main function of these devices, DECAY. In all the existing instruments it
is possible to test the plate voltage, timer performance and other parameters but not the
actual decay function. In the 288 charge plate (available in the 6 x 6 plate only) there is a
test hole in the center of the plate. Simply remove the knurled thumbscrew from the back
panel of the unit and insert it into this hole making sure that the head of the screw is making
contact with the plate. Then run a Decay test and a Decay test in a non-ionized
environment. Both decays should be within a 4 to 6 second range, typical. By performing
this test periodically the user can be assured the unit is operating correctly.
Programming features for Manual Test:
Start Voltage – Range of 10V to 1000V, adjustable in 1V increments
Charge differential – This is the difference between the start decay voltage and how much
over charge the unit puts on the plate. It ranges from 10V to 100V and is adjustable in 1V
increments.
Stop voltage – Range of 0V to 995V, adjustable in 1V increments
Test Start Delay – Range of 0sec to 15sec, adjustable in 1sec intervals. This is the time
delay from when you push the start key and when the test actually begins. This allows the
user to exit the area to minimize their impact on the readings.
Max decay time – Range 10sec to 9999sec adjustable in 1sec intervals. If the unit does
not reach the stop voltage within this time the unit will abort the test. This timer can be
turned off.
Balance Duration – Range of 10sec to 9999sec, adjustable in 1sec intervals. This can also
be set for continuous readings with no time out.
From the MAIN Screen (Figure 1), press SETUP – MANUAL. Then highlight the M.Setup 1,
press DISPLAY. The following screen will appear:
Figure 13. SETUP – MANUAL – M.Setup 1:
Press NEXT or PREV to highlight the
item, then press EDIT to make
changes.
When finish, press SAVE to store the new
settings. Or press CANCEL to discard the
changes.
SETUP M.TEST
M.Setup 1
StartV 1000v MaxDcy 22s
Last enter Stop V 100v BalDur 12s
06/12/08 ChrgDif 50v StrtDly 2s
10:20A
NEXT PREV EDIT CANCEL SAVE