Rpm Check

TB 9-4920-364-35

(5) Repeat (1) above.

(6) Set SW-8 switch to RX1000. If INSULATION CHECK meter does not indicate

zero, perform b (3) below.

(7) Adjust resistance standard for an indication of 100,000 ohms on INSULATION

CHECK meter. If resistance standard does not indicate between 90,000 and 110,000 ohms,

perform b (4) below.

b. Adjustments (fig. 2)

(1) Adjust RX100 0 ADJ TRIMPOT for zero indication on INSULATION CHECK

meter (R).

(2) Adjust decade resistor for 10,000 ohms and adjust RX100-100 ADJ TRIMPOT

for INSULATION CHECK meter indication of 10,000 ohms (R).

(3) Adjust RX1000-0 ADJ TRIMPOT for zero indication on INSULATION CHECK

meter (R).

(4) Adjust RX1000-100 ADJ TRIMPOT for INSULATION CHECK meter

indication of 100,000 ohms (R).

11. Rpm Check

a. Performance check

(1) Set SW-7 switch to MECH. ZERO.

(2) Adjust GALVO-2 MECH. ZERO 4 control for 0 indication.

(3) Adjust R.P.M. control for 0 indication on % dial.

(4) Set SW-7 switch to RANGE. If GALVO-2 does not indicate 0, perform b (1) below.

(5) Set SW-7 switch to MECH. ZERO.

(6) Connect equipment as shown in figure 3.

(7) Adjust audio oscillator frequency for an indication of 14.285 ms on frequency counter.

(8) Adjust R.P.M. control to 100.0 as indicated on % dial.

(9) Set SW-7 switch to RANGE.

(10) Adjust audio analyzer frequency for 0 indication on GALVO-2. If frequency

counter does not indicate between 14.271 and 14.300 ms, perform b (2) below.

(11) Set SW-7 switch to OFF.

b. Adjustments (fig. 2)

(1) Adjust CALIB. POT NO. 1 for zero indication on GALVO-2 (R).

(2) Adjust audio oscillator for indication of 14.285 ms on frequency counter and

adjust CALIB. POT NO. 2 for zero indication on GALVO-2 (R).