TB 9-6625-2215-24
CALIBRATION PROCESS FOR TIMER/COUNTER (HP 5304A)
24. Preliminary Instructions
a. The instructions outlined in paragraphs 24 and 25 are preparatory to the 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 tables 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.
25. 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. Remove bottom cover from TI.
NOTE
Do not handle yellow printed circuit board except at extreme
edges. Fingerprints on this board may degrade instrument
performance.
b. Mount a calibrated TD-1209/U (Hewlett-Packard, Model 5300A) measuring system
on TI and orient the interconnected units upside down.
c. Connect measuring system to autotransformer and connect autotransformer to a
115 V ac source.
d. Adjust autotransformer output for 115 V.
e. Adjust measuring system SAMPLE RATE control cw to on position and allow
1 hour for warm-up.