TB 9-6625-2021-35
7
(6) Adjust autotransformer output to 125 V ac. Allow 1 minute for oscillator to
stabilize. Frequency difference meter indication will be within ±1 part in 10
10
of indication
recorded in (4) above.
(7) Adjust autotransformer output to 115 V ac.
b. Adjustments. No further adjustments can be made.
9. Self-Check
a. Performance Check
(1) Set RANGE switch to CHK and press and release RESET switch. TI display
will initially be all zeros and then 10.000000 MHz ±1 count; the DIR (direct) annunciator
will light and the GATE annunciator should be flashing.
(2) Press RESOLUTION Hz pushbutton to positions listed in table 3. TI display
will be as specified.
Table 3. Self-Check
RESOLUTION Hz
pushbutton positions
Display
±1 count
10 Hz 10.00000 MHz
100 Hz 10.0000 MHz
1 kHz 10.000 MHz
10 kHz 10.00 MHz
100 kHz 10.0 MHz
1 MHz .010 GHz
b. Adjustments. No adjustments can be made.
10. 10 Hz to 250 MHz Frequency and 1 MΩΩ Input Sensitivity Check
a. Performance Check
(1) Press RESOLUTION Hz pushbutton to 10, adjust SAMPLE RATE control to
midposition, and set RANGE switch to 10 Hz-250 MHz.
NOTE
Throughout the remainder of this check, press RESOLUTION
Hz pushbuttons as necessary.
(2) Connect function generator Function Outputs Unbalanced to TI INPUT
1 MΩΩ using a 50Ω feedthrough termination.
(3) Set function generator for a sinewave, 10 Hz, 1 mVp-p, 50Ω output. Slowly
increase function generator amplitude until TI displays a stable indication of applied frequency.
If function generator amplitude exceeds 141 mVp-p, perform b below.
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