HP 8566B Adjustment Manual page 246

12. 10 MHz Standard Adjustment (SN 2637A and Below)
Frequency Counter should now display the difference between
the frequency of the INPUT A signal (A22 10 MHz Frequency
Standard) and 10.0 MHz with a displayed resolution of 1 mHz
(0.001 Hz).
7. Wait at least two gate periods for the Frequency Counter to settle,
and record the frequency of the A22 10 MHz Frequency Standard
as reading #l .
8. Allow the spectrum analyzer to remain powered
STANDBY) and undisturbed for an additional 24 hours.
9. Repeat steps 3 through 7 and record the frequency of the A22 10
MHz Frequency Standard as reading #2.
10. If the difference between reading #2 and reading #l is greater
than 1 mHz, the A22 10 MHz Frequency Standard has not
achieved its specified aging rate; the spectrum analyzer should
remain powered (not in STANDBY) and undisturbed for an
additional 24-hour interval. Then, repeat steps 3 through 7,
recording the frequency of the 10 MHz Frequency Standard at
end of each 24-hour interval, until the specified aging rate of 1
mHz/day ( lX1O-g/day) is achieved.
11. Position the spectrum analyzer on its right side as shown
in Figure 3-52,and remove the bottom cover. Typically, the
frequency of the A22 10 MHz Frequency Standard will shift
slightly when the spectrum analyzer is reoriented. Record this
shifted frequency of the A22 10 MHz Frequency Standard.
12. Subtract the shifted frequency reading in step 11 from the
last recorded frequency in step 10. This gives the frequency
correction factor needed to adjust
Standard.
13. On the Frequency Counter, select a 1 second gate time by pressing
display the difference between the frequency of
signal and 10.0 MHz with a resolution of 0.01 Hz (10 mHz).
Reading # 1:
Reading #2:
Reading #3:
Reading #4:
Reading #5:
Reading #6:
Reading #7:
Reading #8:
Reading #9:
Reading #lo:
Reading # 11:
Reading # 11:
the A22 10 MHz Frequency
Frequency Correction Factor:
(not
in
the
the INPUT A