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 (d) (e) (f) (g) (h) (i) (j) (k) (l) (m)  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 1) If the capacitance is out of the correct range of values, do this task "Tank and Compensator Units Test" (AMM 28-41-21/501) to find a bad tank unit or wire harness.Release the PRESS TO MEASURE switch.Set the battery switch to OFF.Disconnect the UNSHIELDED wire bundle from the test unit.Install a shorting plug on the UNSHIELDED wire bundle.Remove the shorting plug from the COMP wire bundle.Connect the COMP wire bundle to the LO-Z TANK receptacle on the system test unit.Set the battery switch to ON.Push the PRESS TO MEASURE switch and hold it.Turn the TANK CAP PF thumbwheels until the meter shows the minimum value.
 NOTE:____ If you turn the thumbwheels too far, the value increases.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú 28-41-00
 INDICATORS ú CONFIG 3 ú 01A 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 (n)  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.
 (o)  Make sure the TANK CAP PF thumbwheels are set to 40.2 pf with a tolerance of |1.2 pf. 1) If the capacitance is out of the correct range, do this
 task: "Tank Unit and Compensator Test" (AMM 28-41-21/501) to find the problem with the compensator or the wiring.
 S 825-061-003
 (5)  Adjust the capacitance trimmer.
 (a)  
Get access to the capacitance trimmers on the right side of the control stand above the hand microphone receptacle.

 (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) Let the value on the test unit become stable. 3) Continue this procedure until the test unit shows the

 correct capacitance. 4) These are the applicable capacitance values:
 TANK  CAPACITANCE (pf) No. 1 and 2 506.6 Center 180.2
 S 825-043-003
 (6)  Adjust the test unit to give the capacitances for a full tank (Fig. 503).
 (a)  
Set the battery switch on the test unit to OFF.

 (b)  
Disconnect the test harness from the test unit.

 (c)  
Set the FUNCTION switch to CAP BRIDGE.

 (d)  
Set the TANK CAP PF thumbwheels to 41.4.

 NOTE: This is the capacitance value added to the empty
____ tank capacitance by the test unit to simulate a full tank.
 (e)  
Set the battery switch to ON.

 (f)  
Push the COMP CAL switch and hold it.

 (g)  
Set the 10s thumbwheel of COMP SIM PF to 4.

 (h)  
Turn the 0-10 knob until the meter shows the minimum value.

 NOTE: If you turn the knob to a position farther than the
____ correct position, the value on the meter increases.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú  28-41-00
 INDICATORS ú CONFIG 3 ú 01A Page 518 (BARFIELD SYSTEM TESTER) ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (i)  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.
 (j)  
Release the COMP CAL switch.

 (k)  
Set the battery switch to OFF.

 (l)  
Set the TANK CAP PF thumbwheels to the applicable added capacitance value:
　
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