MD Helicopters 369D - 369 D24135-3 Unit); Ammeter Calibration; Engine Oil Temperature Gauge Calibration

CSP-HMI-3 MD Helicopters, Inc.
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3. Ammeter Calibration
Special Tools Required
Battery, dry cell, 1 volt
Potentiometer, 5 watt
(1). Connect output of potentiometer to
LOAD stud of ammeter.
(2). Connect potentiometer arm to battery
negative post and ammeter BATT stud
for negative readings.
(3). Reverse battery polarity for positive
readings.
(4). Compare values with calibration table
(Ref. Table 503).
Table 503. Ammeter Calibration Values (369D24136−BSC Unit)
Ammeter
Graduation
(Amperes)
MV Applied
Indicator Degrees
(Angular)
Tolerance
(Pointer Width)
Min Max
−150 −425 −555 +30.0 ±1
−75 −180 −310 +15 ±1.0
0 −33 +33 0.0 ±0.25
+75 +180 +310 −15.0 ±1.0
+150 +490 +555 −30.0 ±1
4. Engine Oil Temperature Gauge Calibration
Special Tools Required
Power supply, 28.0 +0.3 Vdc
Variable resistor, 0 − 900 ohms
NOTE: When making calibration checks, dis
connect supply voltage. Disconnect variable
resistor from sensing circuits when measur
ing or adjusting values.
(1). Connect power supply to gauge IGN
stud.
(2). Connect variable resistor between
gauge SEND and GND studs.
(3). Connect gauge GND stud to power
supply ground.
(4). Measure resistance values and compare
with calibration table (Ref. Table 504
for 369D24135-BSC unit, Table 505 for
369D24135-3 unit).
Table 504. Engine Oil Temperature Gauge Calibration (369D24135−BSC Unit)
Scale
Graduation
Sensor Ohms
Angular Degrees
Tolerance (Pointer
Width)
Remarks
Min Max
15°C 600 1060 +31.0 ±1 Ascending pointer
30°C 450 650 +26.0 ±1 Ascending pointer
54°C 287 307 +12.0 ±1−1/2 Ascending pointer
107°C 101 109 −24.0 ±1−1/2 Ascending pointer
125°C 60 85 −31.0 ±1 Ascending pointer