(b)
Set the TANK CAP PF thumbwheels to the capacitance value for the applicable tank from this table: ~.................................... | TANK | CAPACITANCE (pf) | ...................................... | No. 1 and 2 | 506.6 | ...................................... | Center | 180.2 | 2...............…....................1
(c)
Push the PRESS TO MEASURE switch and hold it.
(d)
Make sure the meter shows zero.
(e)
If the meter does not show zero, 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.
(f) If the meter does not show zero, do these steps: 1) Turn the applicable trimmer with a screwdriver. 2) Continue this procedure until the meter on the test unit
shows the minimum value.
NOTE: The minimum value must be as close to zero as
____ possible. A value less than 50 microamps is acceptable.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 3
ú 03 Page 509 (BARFIELD SYSTEM TESTER) ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
3) Let the value on the test unit become stable.
(g)
If you adjusted the trimmer, turn the D.F. CONTROL knob again until the meter shows the minimum value.
(h)
Release the PRESS TO MEASURE switch.
S 825-020-003
(3) Adjust the test unit to give the capacitances equivalent to a full fuel 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 increases.
(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.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú
28-41-02 QUANTITY INDICATORS ú CONFIG 3
ú 04 Page 510 (BARFIELD SYSTEM TESTER) ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(l) 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
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