TB 9-6625-2331-24
c. Set POWER switch to ON and allow at least 1 hour for stabilization. If TI has been
disconnected from line power for more than 48 hours, allow at least 48 hours for warm-up
before beginning calibration.
d. Disconnect any connections from inputs A and B.
e. Press keys as listed in (1) through (3) below:
(1) AUX MENU.
(2) SELECT/SET ▲▼to select CAL HYSE.
(3) ENTER.
a. Performance Check
(1) Connect time/frequency workstation 10 MHz output to frequency counter rear
panel 10 MHz reference input connector and set frequency counter external reference on.
(2) Connect TI FREQ STD OUT 10 MHz output jack (rear panel) to frequency
counter Channel A input.
(3) Verify frequency counter indicates between 9.999999000 and 10.00000100 MHz;
annotate calibration condition, and continue with procedure.
(4) Connect time/frequency workstation 1 MHz output to frequency difference meter
rear panel REF INPUT.
(5) Connect TI 10 MHz OUT (rear panel) to frequency difference meter
SIG INPUT.
NOTE
The following time base adjustment is performed during each
calibration to correct for aging (drift) and should only be
reported as an out-of-tolerance condition if the TI is not within
the limits in step (3) above.
(6) Adjust R4 (fig. 1) for a minimum indication on frequency difference meter 1010
range or better. Record frequency difference meter indication.
(7) Allow at least 24 hours for stabilization. Frequency difference meter indication
will remain within 5 parts in 10-10 of indication recorded in step (6) above.
(8) Adjust autotransformer output to 105 V and allow 15 minutes for stabilization.
Verify that TI oscillator drift is less than 5 parts in 10-10.