SECTION 9: CALIBRATION PROCEDURES
Part No. 715-0080, Rev. B
- 75 -
21.
Connect an external source of 12V DC power to the external 12V DC connector. The
DC OP
indicator should illuminate. Verify temperature is maintained while powered from external DC
for five minutes. Disconnect the external power supply and turn the unit off.
CONTROL BOARD CALIBRATION PROCEDURE
The following procedure should be used to calibrate the control board with it installed in the transport
incubator, after any repairs, prior to system calibration.
NOTE:
TP11 and TP13 are ground references.
CAUTION:
The incubator electronics contain static sensitive components that can be damaged
by improper handling. Use approved grounding techniques for work areas and
service personnel.
1.
Disconnect the AC power cord from any AC power source. Connect the temperature sensor
test circuit to
J2
of the control board. Ensure
JP1
on the control board is set to route the
Secondary Thermistor to the Display Board’s “measured temperature” input (jumper
JP1
should
be on positions 1 and 3). Connect the decade box to the temperature sensor test circuit. Set
the temperature sensor test circuit switches as follows:
a.
Set the secondary sensor switch to DECADE BOX position.
b.
Set the primary sensor switch to 1400
position.
c.
Set the decade box to 1454
(37.0
C).
2.
Reconnect the AC power cord to an appropriate AC power source. To set the battery charging
voltage, turn off the incubator power switch and check the voltage at
TP1
. With a fully charged
battery,
TP1
should be 13.7
0.05 volts. Adjust
R1
as necessary.
a.
To check the maximum charging current, measure the voltage from
TP14
to
Z4
pin 7.
The voltage should be approximately 50
10 millivolts.
NOTE:
This
maximum
current
is supplied to a discharged battery. The charging
circuit automatically reduces this current for a charged battery. Be sure to
check the current using a depleted battery, or with a 1.3
, 100 W resistor
in place of the battery.
b.
Turn the incubator power switch to on and allow 10 minutes for the voltage references to
stabilize.
Содержание AirBORNE A750i
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