Chapter 2 Operation
Automatic capacitance simulation
FINAL PSD90-3 Universal AC/DC Fuel Quantity Test Set Operation Manual 22166183 R001
2 - 28 Subject to Export Control; see Cover Page for details. April 2023
4. Connect TANK UNITS LO Z and HI Z connectors to the aircraft interface with the
appropriate interface cables.
5. Turn FUNCTION SELECT switch to MEASURE EXT/TU.
The capacitance of the system’s TU is measured and displayed in ρF on the test
set’s display.
2.5.6 OEM DC capacitance manual range selection
1. Set up for DC capacitance measurement using the DC CAPACITANCE
MEASUREMENT procedure.
2. Push the SIMULATOR COARSE switch to select manual range selection. Rotate the
SIMULATOR COARSE switch to select the range. The following table identifies the
display indication and the measurement range.
3. To select the range, rotate through the display indication screens until the screen that
is to be selected is displayed. After 2 seconds that range will be selected. If AUTO is
selected, step 2 needs to be redone to change back to the manual range.
2.6 Automatic capacitance simulation
1. Connect CHASSIS jack to Airframe.
2. Turn POWER/TYPE SELECT switch to AC CAP, DC CAP, OEM DC, or REV DC.
Allow one minute for test set to stabilize.
3. Turn FUNCTION SELECT switch to MEASURE INT.
4. Connect INDICATOR LO Z and HI Z connectors to the aircraft interface with the
appropriate interface cables.
5. Push the SIMULATOR COARSE switch to select TU, AUX, or TU AND AUX. Adjust
approximately to desired capacitance value.
6. Adjust the FINE knob to desired capacitance value.
7. Turn FUNCTION SELECT switch to SIMULATE. This connects the simulators to the
SIMULATE TO INDICATOR connectors.
Capacitance
Range
Description
Display Indication Capacitance Measurement Range
Auto Auto ρF 0.00 ρF – 1999.9 ρF
Medium 399.99 ρF 0.0 ρF – 399.99 ρF
High 1999.9 ρF 0 ρF – 1999.9 ρF
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