TB 9-6625-1982-24
b. Adjustments
(1) Adjust standard time base adjustment 1 MHz Clock C255 (fig. 2) to obtain
minimum difference indication on frequency difference meter within 1 part in 10-7 ((OPT1)
5 parts in 10-9).
(2) Allow oscillator time to settle (at least 1 hour) after making adjustment and
verify it has not drifted. If needed repeat b (1) above.
(3) Disconnect connections made in a (1) and a (2) above.
(4) No further time base adjustments can be made.
15. Frequency and Sensitivity
a. Equipment Setup. Position TI controls as listed in (1) through (4) below:
(1) FUNCTION switch to FREQ A at GATE TIME as needed.
(2) CH A AC COUPL and CH A + SLOPE pushbuttons in, all other pushbuttons
in out position.
(3) CH A LEVEL adjusted as required for a stable display.
(4) DISPLAY TIME HOLD fully CCW.
b. Performance Check
(1) Connect function/arbitrary generator OUTPUT to TI CH 1 INPUT, using
cable and termination (if needed).
NOTE
Set DISPLAY TIME control switch for best display and
change as needed for each frequency check.
NOTE
Push RESET button, as needed when the applied frequency
and (or) amplitude is changed.
(2) Adjust function/arbitrary generator frequency to 10 Hz and amplitude to
minimum.
(3) Slowly increase function/arbitrary generator amplitude until TI displays a stable
count. Function/arbitrary generator will indicate 100 mV rms or less.
(4) Repeat technique of (2) and (3) above at 1 kHz, 100 kHz, 1 MHz, and 5 MHz.
Function/arbitrary generator will indicate less than 100 mV rms for each frequency applied.
(5) Set function/arbitrary generator output to minimum and disconnect from TI.
(6) Connect signal generator RF OUTPUT to TI CH 1 INPUT, using adapter, cable,
and termination.
(7) Repeat technique of steps (2) and (3) above at 10 MHz, 50 MHz, and 100 MHz.
Signal generator will indicate 100 mV rms or less for each frequency applied.
(8) Set the signal generator output to minimum and disconnect setup.