TB 9-6625-2021-35
13
(4) Allow at least 24 hours for TI time base oscillator to stabilize. Frequency
difference meter indication will be within ±5 parts in 10
10
of indication recorded in (3)
above. Record frequency difference meter indication.
(5) Adjust autotransformer output to 105 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.
(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
action recorded in (4) above.
(7) Adjust autotransformer output to 115 V ac.
b. Adjustments. No further adjustments can be made.
17. Self-Check
a. Performance Check
(1) Press FREQ SHIFT (blue) and RESOLUTION CHECK pushbuttons. Verify
that TI displays 75.000000 MHz ±1 count.
(2) Press RESET pushbutton.
(3) Remove 50Ω termination from FREQ STD OUT (rear panel) and connect
FREQ STD OUT to TI front panel BNC input connector.
(4) Press FREQ SHIFT (blue) and RESOLUTION 1 Hz pushbuttons. Verify that
TI displays 10.000000 MHz ±1 count.
(5) Press RESET pushbutton and reconnect 50Ω termination to FREQ STD OUT
connector (rear panel).
b. Adjustments. No adjustments can be made.
18. Frequency and Sensitivity Check - 10 Hz to 520 MHz
a. Performance Check
CAUTION
The 10 Hz to 500 MHz direct count input BNC connector is
fuse-protected for a maximum input level of 3.5 V rms (+24
dBm)
(1) Press FREQ SHIFT (blue) and RESOLUTION 1 Hz pushbutton.
(2) Connect function generator Function Outputs Unbalanced to TI front panel
BNC input.
(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 71 mVp-p, perform b below.
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