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TM 11-6660-204-25
b. Linearity Measurements (Converter and Re-
(6) Adjust the REF. ADJUST control until
corder Combined). Compare the chart recording
the pen indicates 95 chart divisions.
obtained in a above versus the frequency input for
both the ascending and descending plot of fre-
8-13. Signal Voltage Variation Test for
quencies. The correct chart recording should be a
Converter and Recorder
value equal to the input frequency. The differ-
a. General. Turn on the equipment and allow
ence (spread) between the largest positive devia-
the equipment to warm up for 30 minutes.
tion from the correct reading and the largest neg-
Connect the radiosonde recorder with the asso-
ative deviation from the correct reading shall not
ciated test equipment as shown in figure 8-2.
e x c e e d 0.2 division (approximately .020 inch).
This linearity measurement includes the effects of
b. Procedure.
hysteresis.
(1) Adjust the TS-65C/FMQ-1 Frequency
Standard for a 10-volt peak-to-peak intput signal.
c. Hysteresis Measurements (Converter and Re-
(2) Place the SIGNAL SELECTOR switch in
corder Combined).
the  SIG  position.
(1) With the test configuration shown in
(3) Adjust the signal input frequency to 10
figure 8-2, apply a 10-HZ, 15-volt peak-to-peak
Hz.
signal to the recorder.
(4) Allow the pen to trace for 5 seconds to
(2) Depress the INTER S.C. -OUTPUT S.C.
obtain a stable line.
switch until the pen goes to zero. Release the
(5) Repeat steps (3) and (4) above, adjust-
switch and observe the pen. approach 5 on the
ing the signal frequency to each frequency given
chart from the lower value. Allow the pen to
in the table below.
record for 30 seconds.
(6) Adjust the frequency standard for a 20-
(3) Depress the REC. TEST switch until the
volt peak-to-peak signal voltage and repeat steps
pen goes to 95. Release the REC. TEST switch
(3) through (5) above.
and observe the pen approach 5 on the chart from
(7) Adjust the frequency standard for a 30-
the higher value. Allow the pen to record for 30
volt peak-to-peak signal voltage and repeat steps
seconds.
(3) through (5) above.
(4) The horizontal distance between the two
(8) Use the 20-volt signal recordings as a
traces should not exceed 0.1 of one
r e f e r e n c e . The 10-volt and 30-volt recordings
chart division,
should not vary more than .1 division from the
20-volt recording for each of the corresponding
(5) Repeat the above procedure for 20, 40,
frequency inputs.
60, 80, 100, 120, 140, 160, 180, and 190 Hz.
Frequency
Chart Recording
Step
5
1
10
8-15. Speed of Response
40
20
2
a. With the radiosonde recorder and test equip-
80
40
3
60
120
4
ment in a room temperature environment and
80
160
5
warmed up for 20 minutes, connect as shown in
95
190
6
8-14. Linearity and Hysteresis
b. Rotate the SIGNAL SELECTOR switch to
Measurements
the S.C. position. Adjust for a zero chart record-
ing. Set the TS-65C/FMQ-1 for a 190 Hz input
a. General.
signal. Rotate the SIGNAL SELECTOR switch to
(1) Connect the recorder with the associated
SIG. Adjust the pen to indicate 95.
test equipment as shown in figure 8-2.
(2) With the SIGNAL SELECTOR switch in
c. When the pen is properly adjusted, operate
SIG. position, signal (approximately 25v peak-to-
the SIGNAL SELECTOR switch back and forth
peak) shall be applied in the sequence of 0, 10, 20,
between the SIG. and S.C. positions. Record the
40, 60, 80, 100, 120, 140, 160, 180, 190, 180, 160,
time for the pen to travel between zero and the 95
140, 120, 100, 80, 60, 40, 20, 10, and 0 Hz. Allow
division mark using a stopwatch. This time should
the recorder to print at each frequency setting for
not exceed 2 seconds.
at least 10 seconds.
Change 1

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