TB 9-6625-1959-35
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Position controls as listed in (1) through (3) below:
(1) AMPLITUDE MULTIPLIER switch to X1.
(2) FREQUENCY VARIABLE control to midrange.
(3) FREQUENCY RANGE (MHz) switch to REF ≈ .05.
b. Connect TI to power module, using plug-in extender.
c. Connect power module to a 115 V ac power source.
d. Energize equipment and allow 20 minutes to warm up and stabilize.
8. Amplitude and Amplitude Multiplier
a. Performance Check
(1) Connect audio analyzer INPUT HIGH to TI OUTPUT using precision cable
and 50Ω feedthrough termination.
(2) Adjust OUTPUT AMPLITUDE VOLTS P-P control to 5.0. If audio analyzer
does not indicate between 1.714 and 1.820 V ac, perform b(l) below.
(3) Adjust OUTPUT AMPLITUDE VOLTS P-P control to 0.5. If audio analyzer
does not indicate between 171.4 and 182.0 mV ac, perform b(2) below.
(4) Adjust OUTPUT AMPLITUDE VOLTS P-P control to 5.0.
(5) Set AMPLITUDE MULTIPLIER switch to X.1. Audio analyzer will indicate
between 169.6 and 183.9 mV ac.
(6) Set AMPLITUDE MULTIPLIER switch to X.01. Audio analyzer will indicate
between 16.79 and 18.56 mV ac.
b. Adjustments
(1) Adjust R255 5V (fig. 1) for a 1.767 V ac indication on audio analyzer (R).
(2) Adjust R265 .5V (fig. 1) for a 176.8 mV ac indication on audio analyzer (R).
NOTE
R255 5V and R265 .5V adjustments interact. Repeat a(1)
through (6) above until deviation from reference at both points
is minimized.
