METER 
ADJUST  ON  TESTER 
INDICATOR  BATTERY 
OFF 
SWITCH 
INS TEST POINTS  BATT 
TEST  GND/LO-Z GND/HI-Z  SH/LO-Z SH/HI-Z  TEST 
FUNCTION  GND/SH  LOZ/HI-Z  COAXIAL 
SWITCH 
.1  INDICATOR TEST FUNCTION CAP BRIDGE  UNSHIELDED 
INSULATION  1  CAP SIM 
HI-Z  .01 RANGE  2  TANK CAP pf  HI-Z COAX 
PRESS TO  LO-Z  1  7  4  5  LO-Z 
MEASURE  TANK 
0-10 
BUTTON  10100 
GND  1  7  COMP 
D.F.  COMP 
PRESS TO 
MEASURE  COMP SIM pf 
COMP 
CAL 

SHORTING CAPS TANK CAP INSTALLED
D.F.
GROUNDED THUMBWHEELS CONTROL
TO AIRPLANE
1
KNOBSTRUCTURE COAXIAL
COMP
HI-Z
COAX
5 LO-Z
TANK 0-10
COMP
UNSHIELDED
SIM pf
COMP CAL
SHORTING CAPS INSTALLED
2
BARFIELD SYSTEM TESTER
1
SET-UP FOR TANK UNIT CAPACITANCE MEASUREMENT
2
SET-UP FOR COMPENSATOR CAPACITANCE MEASUREMENT
Test Equipment Set-Up for Capacitance Measurement Figure 502
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 3
 ú 02 Page 507 (BARFIELD SYSTEM TESTER) ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 E. Trim Procedure
 S 975-018-003
 (1)  Measure the empty tank capacitances.
 (a)  
Set the battery switch on the test unit to ON.

 (b)  
Push the PRESS TO MEASURE switch and hold it.

 (c)  
Turn the TANK CAP PF thumbwheels until the meter shows the minimum value.

 NOTE: If you turn the thumbwheels to a position farther
____ than the correct position, the value increases.
 (d)  Turn the D.F. CONTROL knob until the meter shows the minimum value.
 NOTE: If you turn the knob to a position farther than the
____ correct position, the value increases. The D.F. CONTROL has very little effect for capacitances below approximately 50 pF. The test unit is more sensitive to adjustment of the D.F. CONTROL for larger capacitances.
 (e)  
Make sure the TANK CAP PF thumbwheels are set to 40.2 picofarads (pf) with a tolerance of |1.2 pf.

 (f)  
Release the PRESS TO MEASURE switch.

 (g)  
Set the battery switch to OFF.

 (h)  
Disconnect the COMP wire from the test unit.

 (i)  
Install a shorting plug on the COMP wire.

 (j)  
Remove the shorting plug from the UNSHIELDED wire.

 (k)  
Connect the UNSHIELDED wire to the LO-Z TANK receptacle on the test unit.

 (l)  
Set the battery switch to ON.

 (m)  
Push the PRESS TO MEASURE switch and hold it.

 (n)  
Turn the TANK CAP PF thumbwheels until the meter shows the minimum value.

 NOTE: If you turn the thumbwheels to a position farther
____ than the correct position, the value increases.
 (o)  Turn the D.F.CONTROL knob until the meter shows the minimum value.
 NOTE: If you turn the knob to a position farther than the
____ correct position, the value increases. The D.F. CONTROL has very little effect for capacitances below approximately 50 pF. The test unit is more sensitive to adjustment of the D.F. CONTROL for larger capacitances.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 3
 ú 02 Page 508 (BARFIELD SYSTEM TESTER) ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (p)  Make sure the thumbwheels are set to these capacitance values with the applicable tolerance: ~.......................................................... | TANK | CAPACITANCE (pf) | TOLERANCE (pf) | ............................................................ | No. 1 and 2 | 506.6 | |7.8 | ............................................................ | Center | 180.2 | |2.7 | 2...............…........................….................1 1) If the thumbwheels are set to a value out of the applicable
　
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