SECTION 9: CALIBRATION PROCEDURES
Part No. 715-0080, Rev. B
- 77 -
5.
Adjust the voltage of the DC supply to 18.3
0.05 volts. Connect a jumper across
R59
. (
R59
is
located 1.5 inches below variable resistor
R7
.) Set the decade box to 1576
. Turn the
incubator power switch on. Observe the waveform at
TP12
with an oscilloscope. The duty
cycle of the square wave should be 60
5%. Adjust
R12
as necessary. Verify that the period
is between 14 ms and 16 ms. Disconnect the jumper on
R59
.
6.
Decrease the voltage output of the DC supply to 10.5 volts. The low battery alarm should
activate.
7.
Slowly decrease the applied voltage until the display turns off and the
PWR FAIL
indicator
illuminates. This should occur at 10.1
0.3 volts. If it does not, perform one of the following
procedures:
a.
If the shutdown occurs below 10.1 volts do the following:
i.
Increase the applied voltage to 12.0 volts.
ii.
Cycle the power switch to off, then to on.
iii.
Adjust the applied voltage to 10.1 volts.
iv. Slowly
adjust
R6
clockwise until the display just shuts down.
b.
If the shutdown occurs above 10.1 volts, do the following:
i.
Increase the applied voltage to 12.0 volts.
ii.
Cycle the power switch to off, then to on.
iii. Adjust
R6
fully counter clockwise.
iv.
Adjust the applied voltage to 10.1 volts.
v. Slowly
adjust
R6
clockwise until the display just shuts down.
vi.
Turn off power and remove the DC supply and reconnect the battery.
vii. Return
JP1
to its original position (pins 1 and 3).
viii.
Remove all test apparatus and reassemble unit. Proceed to the System
Calibration.
8. Perform
the
System
Calibration procedure.
Содержание AirBORNE A750i
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