(h)  
Make sure the resistance shown on the system test unit is more than 250 megohms.

 NOTE: The test unit shows a value of more than 1,000
____ megohms as an open circuit (infinite resistance).
 (i)  
Set the FUNCTION MEASURE switch (PSD40-1) or the SELECT switch (PSD60-1) to each of the SHLD or GND positions.

 (j)  
Make sure that each resistance shown on the system test unit is more than the applicable minimum resistance: SWITCH SETTING MINIMUM RESISTANCE

 LOZ-SHLD 1 Megohm COMP-SHLD 1 Megohm HIZ-SHLD 1 Megohm SHLD-GND 10 Megohms LOZ-GND 10 Megohms COMP-GND 10 Megohms HIZ-GND 10 Megohms
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú  28-41-00
 INDICATORS ú CONFIG 2 ú 02A Page 519 (SIMMONDS SYSTEM TESTER) ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FUNCTION MEASURE SWITCH

FUNCTION SELECT SWITCH
TESTER POWER SWITCH
TANK  ADAPTER CABLES 
WING  PSD40-502-3 
CENTER  PSD40-502 

DO NOT

TO
CONNECT TO
COMPENSATOR
FUEL
AND TANK
QUANTITY
UNITS
INDICATOR
T-CABLE
CABLE
SIMMONDS PSD40-1 SYSTEM TESTER
Test Equipment Set-Up for Resistance Measurement
Figure 504 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ANALOG FUEL QUANTITY ú
 28-41-00 INDICATORS ú CONFIG 2
 ú 01A Page 520 (SIMMONDS SYSTEM TESTER) ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
POWER SWITCH

SIMMONDS
PRECISION

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 Resistance Measurement
Figure 504 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS  ú  CONFIG  2
 ú  01A  Page 521
 (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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
FUNCTION HIZ-SHLD SHLD-GND
SIMULATOR COMP-SHLD LOZ-GND
SIMMONDS
LOZ-SHLD
COMP-GND COMP 2 LOZ-COMP HIZ-GND
PRECISION
X100 PF
PF
V1 M^ D1
COMP
D4
COMP-HIZ HIGH TU LOW
FUNCTION
LOZ-HIZ 0-200 PF
S3
TU
SWITCH

MEASURE
SELECT
INT CAP
SIM EXT CAP CAP SELF TEST
MEG MEG
X10 PF V2 FUNCTION SEL S2 D2
0-25 PF
J1 LOZ J4 PSD40-1 COMP
J2 HIZ
TESTER
POWER
J3 COMP

X10 PF V3 INDICATOR TAN
SWITCH
D3
0-25 PF ON
J7 COMP
J9
O F

S1
CHA SIS LOZ 2 HIZ COMP 2
UNSHIELDED
GROUNDED TO
AIRPLANE
　
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