Figure 8-1. External test configuration.

TM 11-6660-204-25

Figure 8-1. External test configuration.

(4) Repeat steps (1), (2), and (3) above to

8-7. Pen-Lift Test

insure that one adjustment has not altered an-

(fig. 8-2)

other.

a. Adjust the output of the Frequency Standard

(5) Turn the SIGNAL SELECTOR switch to

Test Set TS-65C/FMQ-1 to 190 Hz at a peak-to-

SIG. position.

peak voltage of 10 volts. Remove the screws from

c. Mechanical Checks. Perform the following

the converter panel and pull down the panel door

visual checks prior to equipment warmup:

to obtain access to the test jacks. Connect Oscillo-

( 1 ) All mechanical components including

scope AN/USM-140A to the output of Test Set

panel locks and rack slides should operate

TS-65C. Connect the signal lead of the test cable

smoothly.

from the output of the test set to jack J303 and

(2) The frequency-time recorder chart drive

the shield of the cable to ground at jack J326.

gear train shall have no worn gears or broken

b. Operate the SIGNAL SELECTOR switch to

gear teeth. All chart drive gear train mechanism

the SIG. position and adjust the test set so the

mounting components shall be secure.

recorder pen will print successively at approxi-

d. Powerline Frequency and Voltage Meters.

mately 0, 30, 60, 95, 60, 30, and 0 chart divisions.

The powerline frequency meter should indicate 60

c. The beginning and ending tails of

Hz. The powerline voltage meter should indicate

the recording shall not exceed two chart

within 5% of the input line voltage from the

recorder divisions.

power source.

8-5. Fan Operation

d. Replace the screws and secure the control

a. Place a piece of tissue paper over the fan

panel unless other tests are to be made.

opening. The fan will have sufficient air moving

capabilities if the paper remains in place while

8-8. Chatter

the fan is in operation.

a. Place SIGNAL SELECTOR switch in S.C.

b. Remove the tissue paper from the fan open-

position, allow pen to print at 0 chart divisions

ing.

for a few seconds, depress REC. TEST switch and

hold until the pen comes to rest, then release and

8-6. Speaker Output

allow the pen to return to 0 chart divisions.

The speaker output test will be conducted simulta-

b. There should be no chatter of the pen holder

neously with the pen tests at various frequencies.

assembly when moving either up or down scale.

During these tests, listen to the speaker output

and signal quality; it should be free of audible

8-9. Pen Pressure

distortion and be capable of being heard in a rea-

a. Place the control panel power switch in the

sonably quiet room at a distance of 25 feet.

8-2

Change 2