TB 9-4920-458-24
perform b below.
(4) Repeat (2) and (3) above for remaining TI 10 MHz OUTPUT connectors.
b. Adjustments
(1) Remove TI top cover.
(2) Set TI CONTROL VOLTAGE/RUBIDIUM LAMP/EXT DC SUPPLY switch
to EXT DC SUPPLY. If TI meter does not indicate 24 1 V dc, adjust R13 on power supply
board (inside right of TI) (R).
(3) Set TI CONTROL VOLTAGE/ RUBIDIUM LAMP/EXT DC SUPPLY switch
to CONTROL VOLTAGE.
NOTE
If crystal trim adj is adjusted too fast in (4) or (5) below, the
control loop opens and a search circuit is automatically
initiated to relock the atomic resonance. This may take up to
30 seconds.
(4) If TI meter indication is 1.5 V dc or less, remove screw to access hole on top of
RUBIDIUM OSCILLATOR and adjust crystal trim adj slowly cw until meter indicates
approximately 8 to 9 V dc. Replace screw (R).
(5) If TI meter indication is 12 V dc or greater, remove screw to access hole on top of
RUBIDIUM OSCILLATOR and adjust crystal trip adj slowly ccw until meter indicates
approximately 8 to 7 V dc. Replace screw (R).
(6) Adjust R1 dial (inside bottom of TI) for a minimum frequency difference meter
indication (R).
(7) Replace TI top cover.
9. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
