S 975-059-003
(8)
Do these steps to calibrate the test equipment:
(a)
Set the battery switch to ON.
(b)
Set the TEST FUNCTION selector switch on the test set to INSULATION.
(c)
Set the INS TEST POINTS selector switch to GND/SH.
(d)
Adjust the METER ADJUST knob on the test set until the meter is at its maximum value (infinity).
S 015-052-003
(9)
Do this task: Fuel Summation Unit Removal (AMM 28-41-81/401).
S 485-037-003
(10)
Connect the test equipment (Fig. 504).
(a)
Connect the ground lead from the GND receptacle of the test set to a good airframe ground.
(b)
Connect the test harness to the airplane wire bundle.
(c)
Connect the test harness to the system test unit.
E. Test Procedure
S 975-038-003
(1) Measure the empty tank resistances.
(a)
Read the total resistance for the tank units.
1) Make sure the resistance shown on the test unit is more than 250 megohms.
(b)
Set the INS TEST POINTS switch to each of the to each of the SHLD or GND positions shown below.
(c)
Make sure that each resistance shown on the test unit is more than the applicable minimum resistance: ~..................................................... | SWITCH SETTING | MINIMUM RESISTANCE | ....................................................... | SH/HI-Z | 1 Megohm | ....................................................... | SH/LO-Z | 1 Megohm | ....................................................... | GND/HI-Z | 10 Megohm | ....................................................... | GND/LO-Z | 10 Megohms | ....................................................... | GND/SH | 10 Megohms | 2................…....................................1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 3
ú 02 Page 516 (BARFIELD SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
DO NOT
TO COMPENSATOR CONNECT
FUEL QUANTITY AND TANK UNITS INDICATOR
INSTRUMENT METER
TEST POINTS ADJUST
SWITCH KNOB
METER
ADJUST ON TESTER
INDICATOR BATTERY
OFF SWITCH
INS TEST POINTS BATT
GND/HI-Z SH/LO-Z TEST
GND/LO-Z SH/HI-Z
GND/SH LOZ/HI-Z
COAXIAL
TEST FUNCTION
.1 INSULATION INDICATOR CAP BRIDGE 1 CAP SIM UNSHIELDED
HI-Z .01 RANGE 2 TANK CAP pf HI-Z COAX
1 7 4 5
LO-Z LO-Z
0-10 100 10
COMP GND
17
D.F.
COMP
PRESS TO MEASURE COMP SIM pf
COMP CAL
TEST TO AIRPLANE 1 GROUNDED
FUNCTION STRUCTURE
SWITCH
BARFIELD SYSTEM TESTER
COAXIAL
COMP
HI-Z
COAX
45 LO-Z
0-10
COMP
UNSHIELDED
COMP CAL
2
1
SET-UP FOR TANK UNIT INSULATION RESISTANCE MEASUREMENT
2
SET-UP FOR COMPENSATOR INSULATION RESISTANCE MEASUREMENT
Test Equipment Set-Up for Resistance Measurement Figure 504
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 3
ú 01 Page 517 (BARFIELD SYSTEM TESTER) ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(d)
Disconnect the UNSHIELDED wire bundle of the test harness from the INSULATION LO-Z receptacle on the test unit.
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