TB 9-6625-1966-35
(8) Set TI FREQUENCY switch to <50KC and repeat technique of (2) through (6)
above for frequencies of 50 and 10 kHz.
(9) Connect audio analyzer to function generator CHANNEL A OUTPUT.
(10) Set TI function MODE switch to FREE RUN.
(11) Measure and record distortion.
(12) Set TI MODE switch to PHASE LOCK and insure that phase lock is obtained,
as indicated on oscilloscope.
(13) Repeat (11) above. Difference between recordings will be 3 percent or less.
(14) Repeat (10) through (13) above for frequency 50 kHz.
(15) Set TI FREQUENCY switch to >50KC.
(16) Repeat technique of (1), (3), and (10) through (13) above for frequencies of
10 kHz and 100 Hz. The difference between recordings will be 1 percent or less.
b. Adjustments
(1) Obtain phase lock and adjust PHASE dial to 0 degree. Adjust R3 (fig. 5) until
the two displays are in phase (R).
(2) Obtain phase lock and adjust PHASE dial to 180 degrees and adjust R2 (fig. 5)
until the two displays are in phase (R).
23. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
CALIBRATION PROCESS FOR MODEL 3304A
24. Preliminary Instructions
a. The instructions outlined in 24 and 25 are preparatory to this calibration process.
Personnel should become familiar with the entire bulletin before beginning the calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the result of each test and whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
