The L-1011 Electrical System panel has both a AC as well as a DC voltmeter. The pinout shown here is for the DC Voltmeter.
The instrument shown above is the original Instrument used on the L-1011. However, the way the back illumination worked on the L-1011 electrical and hydraulic gauges caused a lot of yellowing due to heat exposure. Instruments used on Boeing Aircraft like the B747 with the same pinout did not experience that because the illumination of the gauge is significantly different. Below is the B747 instrument using exactly the same pinout:
Here is the pinout:
The instrument shown above is the original Instrument used on the L-1011. However, the way the back illumination worked on the L-1011 electrical and hydraulic gauges caused a lot of yellowing due to heat exposure. Instruments used on Boeing Aircraft like the B747 with the same pinout did not experience that because the illumination of the gauge is significantly different. Below is the B747 instrument using exactly the same pinout:
Here is the pinout:
Pin
|
Pin Assignment
|
Value
|
1
|
+5V Lighting
|
0 .. +5DCV
|
2
|
Instrument Lighting GND
|
GND
|
3
|
Instrument Casing GND
|
GND
|
4
|
DC Source GND
|
GND
|
5
|
DC Source
|
0 .. +40VDC
|
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