Figure 4-1. Radiosonde Recorder AN/TMQ-5(*), Cable Connections.

TM 11-6660-204-25

a. All waveforms are obtained by connecting the

oscilloscope between the test point specified on fig-

ure FO-15 and the chassis.

b. Set the oscilloscope horizontal sweep selector to

display the horizontal frequency shown on the wave-

form of figure FO-15. Set the vertical amplifier con-

trol so that the vertical component of the waveform

falls within the value specified.

c. In some cases it maybe necessary to unbalance

the detector to create a signal in the servo amplifier.

To unbalance the detector, place the SIGNAL SE-

LECTOR switch in the 60 CPS position and adjust

the REF. ADJUST control until the pen indicates 30

chart divisions. Operate the power switch (S201) to

the POWER OFF position. Disconnect the black and

white wires of balancing motor B501 from terminals

3 and 4 of terminal board E501. Operate the power

switch (S201) to the POWER ON position. Manually

rotate the slide and trolley wire arm until the pen

travels a distance corresponding to the percentage of

unbalance desired. (The number of chart divisions

that the pen travels from 30 chart divisions is equal

to the percentage of unbalance in the detector.)

Therefore, to obtain a 2-percent unbalance, rotate

the slide and trolley wire arm so that the pen will

Figure 4-1. Radiosonde Recorder AN/TMQ-5(*), Cable Connections.

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