Pen-Lifter Test

TM 11-6660-204-25

the frequency standard output to test jack J303

5-6. Pen-Lifter Test

on the signal data converter. The frequency stand-

a. Test Equipment and Materials. F r e q u e n c y

ard output should be at zero. On multispeed recor-

Standard TS-65C/FMQ-1 is required for this

ders, select inch per second chart speed.

test.

c. Procedure.

b. Test Connections and Conditions. C o n n e c t

a. Test Equipment and Materials. F r e q u e n c y

5-7. Hysteresis Test

Standard TS-65C/FMQ-1 is required for this

The recorded input signal to the radiosonde recor-

test.

d e r at any frequency between 10 and 190 Hz

b. Test Connection and Conditions. C o n n e c t

should not deviate from the recording of the same

the frequency standard output to test jack J303

s i g n e d by more than 0.1 of one chart division

on the signal data converter. Adjust sensitivity of

when approached by a higher or lower frequency.

the recorder as described in paragraph 3-34.

This deviation is called hysteresis. Excessive hys-

teresis is eliminated as explained in paragraph

c. Procedure.

4-12.

Change 3