TB 9-4931-488-24
8. Internal Reference Accuracy
a. Performance Check. Connect TIME BASE REF (rear panel) to frequency
counter. Adjust internal reference oscillator (located through hole on right-hand side of
front panel window) for a frequency counter indication of 5.000000 MHz.
NOTE
Check reference oscillator frequency again after 2 hours. The
reference should be between 4.9999995 and 5.0000005.
b. Adjustments. No further adjustments can be made.
9. Frequency Range, Accuracy, and Stability
a. Performance Check
(1) Connect frequency counter channel A to TI auxiliary output (rear panel).
(2) Frequency counter should indicate 1.070 MHz or greater.
(3) Turn FREQUENCY TUNE control fully ccw.
Frequency counter should
indicate 0.450 MHz or less.
(4) Set RANGE MHz switch to 64-32 and adjust FREQUENCY TUNE control for
a FREQUENCY MHz display of 50 MHz.
(5) Press COUNTER MODE EXPAND X100 pushbutton.
(6) Adjust frequency counter time base for 8 digits resolution. Difference between
TI display and frequency counter indications should be less than 110 Hz.
(7) Press COUNTER MODE EXPAND X100 released, X10 and COUNTER
MODE LOCK pushbuttons pressed.
(8) Allow 1 minute to acquire phase lock. Difference between frequency counter and
TI display indications should be less than 100 Hz.
(9) Release COUNTER MODE EXPAND X10 and LOCK pushbuttons.
(10) Observe frequency counter indication for 10 minutes. Frequency change should
be less than 500 Hz.
(11) Press COUNTER MODE LOCK ON pushbutton. Vary autotransformer from
123 to 105 V. Frequency counter indication should not vary more than 50 Hz.
(13) Release COUNTER MODE LOCK ON pushbutton and disconnect equipment setup.
b. Adjustments. No adjustments can be made.
a. Performance Check
(1) Load sensor module Option 504 sensor data into measuring receiver. Connect
sensor module Option 504 to power meter reference output and calibrate sensor.
(2) On measuring receiver select MODE, then Spectrum Analysis.