5.1.2 Running Time 
There are no adjustments to this circuit except the amplitude control of the tone 
oscillator. Details on this adjustment are covered in Section IV, 2.3. 
5.1.3 Port—Starboard Indicator 
A microswitch on the servo unit is cam-actuated when the rudder passes the 
0-degree position. The cam may be adjusted by loosening the set screw in the edge of the 
cam. The only other adjustment to this circuit is the amplitude control on the tone oscillator. 
See Section IV, 2.3, for details of this adjustment. 
5.2 PROPULSION CHANNELS 
The adjustment of the telemetering portions of these channels is described in 
Section IV, 2. The SENS controls on the readout circuit discriminators in the console should 
be turned fully clockwise. The system may be most easily checked by driving the pickup with 
a variable speed 0- to 3000-rpm motor and following the procedure outlined below. 
a. Connect an oscilloscope to the digital output connector on the console and adjust R-1 
(PORT) or R-2 (STBD) for stable operation of the Schmitt trigger over the entire speed range. 
b. Connect a digital events-per-unit-time meter to the digital output connector on the 
console. 
c. Set the meter range selector on the console to the 1500-rpm position. Using the 
digital indicator, adjust the motor speed to 1000 rpm. If the console meter indication is not 
correct, adjust the appropriate calibrating capacitor (Figure 19) for proper indication. Repeat 
the procedure for the 3000-rpm range using a motor speed of 2000 rpm. NOTE: If the capacitors 
will not cover the range or if both ranges are off in the same direction, R-4 or R-5 may be 
adjusted. 
d. Check the accuracy of the console indicators at several points for each range. 
Accuracy should be better than + 1.5 percent of full scale. 
5.3 SPARE CHANNELS 
The spare channels are simple analog and ON-OFF channels. The adjustment procedures 
are outlined in Section IV, 2. 
6. POWER SUPPLIES 
6.1 CONSOLE EQUIPMENT 
The vacuum-tube power supplies for the console equipment have potentionmeters for 
adjustment of output voltage and balance controls for ripple reduction. Control numbers and 
IV-9 
