PRESS FOR
ON PF
TWO TERM. MEG READINGS
506.6
CHASSIS
M
OFF

PSD60-1
AIRCRAFT ONLY
SIM TU ONLY SIMULATOR
F
SIM TU & COMP U
INDICATOR TANK N
UNITS

TU
MEASURE INT C COMP
T MEASURE EXT
0 2 0 4 2
LOZ
T
TU
PF COMP
T

LOZ-HIZ
U
10-200 PF
10-2000 PF LOZ-COMP S
COMP-HIZ
HIZ
LOZ-SHLD E
C

L
SHLD H COMP-SHLD
O
E
M

HIZ-SHLD
M
C
P

SHLD-GND
T
COMP

LOZ-GND
COMP-GND
C

HIZ-GND SYSTEM
TESTER
ADAPTER
TANK
CABLES
CONNECT TO
AIRFRAME
WING

PSD40-502-3GROUND
CENTER
PSD40-502
DO NOT TO
CONNECT TO PSD40-503 COMPENSATOR
FUEL AND TANK
QUANTITY UNITS
INDICATOR AIRCRAFT
ADAPTER
T-CABLE WIRINGCABLE
SIMMONDS PSD60-1 SYSTEM TESTER
Test Equipment Set-Up for Capacitance Measurement
Figure 502 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS  ú  CONFIG  2
 ú  01A  Page 509
 (SIMMONDS SYSTEM TESTER)  ú  Jul 15/93 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

FUNCTION MEASURE SWITCH

INDICATOR

TO COMPENSATOR AND TANK UNITS
SIMMONDS PSD40-1 SYSTEM TESTER WITH THE F72731 CABLE

Test Equipment Set-Up for Capacitance Measurement
Figure 502 (Sheet 3)

C40106
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS ú CONFIG 2 ú 01A Page 510 (SIMMONDS SYSTEM TESTER) ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (b)  Turn the applicable capacitance trimmer until the system test unit shows the applicable capacitance value from this table: 1) Turn the trimmer with a screwdriver. 2) Remove the screwdriver. 3) Let the value on the test unit become stable. 4) Continue this procedure until the test unit shows the
 correct capacitance. 5) These are the applicable capacitance values:
 TANK  CAPACITANCE (pf) No. 1 and 2 506.6 Center 180.2
 S 825-024-002
 (3)  Adjust the system test unit to give the capacitances equivalent to a full fuel tank (Fig. 503).
 (a)  
Set the FUNCTION SEL switch on the system test unit to INT CAP (PSD40-1) or set the FUNCT switch to MEASURE INT (PSD60-1).

 (b)  
Set the FUNCTION MEASURE switch (PSD40-1) or the SELECT switch (PSD60-1) to COMP.

 (c)  
Adjust the SIMULATOR COMP decade capacitor (D2) and vernier knob (V2) until the system test unit shows 41.4 pf.

 NOTE: This is the capacitance value added to the empty
____ tank capacitance by the test unit to simulate a full tank.
 (d)  
Set the FUNCTION MEASURE switch (PSD40-1) or the SELECT switch (PSD60-1) to TU.

 (e)  
Adjust the SIMULATOR TU decade capacitor (D1) and the vernier knob (V1) until the display on the system test unit shows the applicable added capacitance value:

 NOTE: This is the capacitance value added to the empty
____ tank capacitance by the test unit to simulate a full tank.
 TANK ADDED CAPACITANCE (pf) No. 1 and 2 *[1] 568.8 Center *[1] 191.0
 No. 1 and 2 *[2] 569.9
 Center *[2] 190.5

 *[1] Fuel quantity indication in pounds
 *[2] Fuel quantity indication in kilograms

 (f)  Set the FUNCTION SEL switch to SIM (PSD40-1) or set the FUNCT switch to SIM TU & COMP (PSD60-1).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú  28-41-00
 INDICATORS ú CONFIG 2 ú 02A Page 511 (SIMMONDS SYSTEM TESTER) ú Jul 15/96
　
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