(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 increases.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 3
 ú 01 Page 521 (BARFIELD SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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) (k) (l)  Release the COMP CAL switch.Set the battery switch to OFF.Set the TANK CAP PF thumbwheels to 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 | 2.........................…............................1
 *[1] Fuel quantity indication in pounds *[2] Fuel quantity indication in kilograms
 (m) (n)  Set the FUNCTION switch to CAP SIM 1.Connect a T connection between the test harness wires that have the COAXIAL label.
 (o)  Connect the T connection to the HI-Z COAX receptacle on the test unit.
 (p)  Connect a T connection between the test harness wires that have the UNSHIELDED label.
 (q)  Connect the T connection to the LO-Z TANK receptacle on the test unit.
 (r)  Connect a T connection between the test harness wires that have the COMP label.
 (s)  Connect the T connection to the LO-Z COMP receptacle on the test unit.
 (t)  Set the battery switch to ON.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
 28-41-02 QUANTITY INDICATORS ú CONFIG 3
 ú 01 Page 522 (BARFIELD SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 975-042-003
 (7)  Do a check of the values on the fuel quantity indicators with a full tank.
 (a)  
Connect the test harness to the rear of the fuel quantity indicator.

 (b)  
Close the QTY and EP GND FUELING circuit breakers and let the system become warm for five minutes.

 (c)  
Make sure the fuel quantity indicator shows the applicable full value with the applicable tolerance: ~................................................. | TANK | FULL VALUE | ................................................... | No. 1 and 2 *[1] | 11000 |110 lb | ................................................... | Center *[1] | 16800 |170 lb | ................................................... | No. 1 and 2 *[2] | 5000 |50 kg | ................................................... | Center *[2] | 7600 |80 kg | 2.........................….......................1 *[1] Fuel quantity indication in pounds *[2] Fuel quantity indication in kilograms

 (d)  
Write the value shown on the fuel quantity indicator.
　
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