TB 9-6625-2215-24
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. Mount TD-1209/U (Hewlett-Packard, Model 5300A) measuring system on TD-
1211/U (Hewlett-Packard, Model 5302A) 50 MHz universal counter.
b. Connect TI measuring system to autotransformer and connect autotransformer to a
115 V ac source. Adjust autotransformer output for 115 V.
c. Adjust TI measuring system SAMPLE RATE control cw to ON position and allow 1
hour for warm-up.
8. Time Base Stability
a. Performance Check
(1) Connect OSC jack on rear of TI measuring system to time/frequency
workstation J10 input (rear panel) using a 50 Ω feedthrough termination.
(2) Adjust OSC ADJ C7 (rear of TI measuring system) for minimum difference
indication on time/frequency workstation. Time/frequency workstation will indicate less
than 3 parts in 10-7.
(3) While monitoring time/frequency workstation indication, vary output of
autotransformer from 105 to 125 V. Time/frequency workstation indication will remain
within l part in 10-7.
(4) Adjust output of autotransformer to 115 V.
b. Adjustments. No further adjustments can be made.
9. Sensitivity
a. Performance Check
(1) Connect function generator OUTPUT to TI A 50 MHz jack, using termination.
(2) Position TI 50 MHz counter controls as listed in (a) through (d) below:
(a) FUNCTION switch to FREQ A.