SECTION 9: CALIBRATION PROCEDURES
Part No. 715-0080, Rev. B
- 76 -
c.
To check the two independent voltage references, measure the voltage at
TP4
and
TP10
. The voltage should be 5.00
0.005 volts. If necessary, adjust
R4
and
R10
respectively.
d.
To check the calibration of the setpoint temperature circuit, adjust the setpoint
temperature to 37.0
C. With a properly calibrated display board, the voltage at
TP2
should be 3.399
0.005 volts. Adjust
R2
on control board as necessary.
e.
To check the calibration of the secondary temperature sensor, measure the voltage at
TP9
. It should be 3.421
0.005 volts. Adjust
R9
as necessary.
f.
To check the
SYS FAIL
alarm, set the decade box to 1326
. The
SYS FAIL
alarm
should activate at 39.2
C (when switching from 1325
to 1326
100
). Adjust
R15
as necessary. Achieving the exact temperature and ohm values is not critical now as
this alarm will be readjusted more precisely during the system calibration.
g. Ensure
JP1
on the control board is set to route the Primary Thermistor to the Display
Board’s “measured temperature” input (jumper
JP1
should be on positions 1 and 2). Set
the temperature sensor test circuit switches as follows:
i.
Primary sensor switch to DECADE BOX
ii.
Secondary sensor switch to 1400
iii.
Set the decade box to 1454
(
37.0
C).
h.
To check the primary sensor calibration, measure the voltage at
TP3
. It should be 3.399
0.005 volts. Adjust
R3
as necessary.
i.
Set the decade box to 1356
100
. The
HIGH TEMP
alarm should activate at 38.5
C
when switching from 1356 to 1355
100
. Adjust
R8
as necessary. Achieving the
exact temperature and ohm values is not critical now, as this alarm will be readjusted
more precisely during the system calibration.
3.
Set the decade box to 1329
100
(the HIGH TEMP alarm will be on). The
SYS FAIL
alarm
should activate while switching at 39.0
C (when switching from 1329 to 1328
100
. Adjust
R7
as necessary. Achieving the exact temperature and ohm values is not critical now, as this
alarm will be readjusted more precisely during the system calibration.
4.
Turn off the incubator and unplug the AC cord. Remove the negative lead from the battery
post. Connect the variable DC supply in place of the battery.
Summary of Contents for AirBORNE A750i
Page 1: ...A750i Transport Incubator Service Manual...
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