Filter
Top Products
12. Time Base Adjustment (SN 2840A and Below, also 3217A05568 and Above)
6. Set the Frequency Counter controls as follows:
INPUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A
ATTENUATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.x10
DC Coupled
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
1
Mdl
input impedance
. . . . . . . . . . . . . . . . . . . . . . . . . . OFF
AUTOTRIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ON
100
kHz
FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
INT/EXT switch (rear panel) . . . . . . . . . . . . . . . . . . . . . EXT
7. On the Frequency Counter, select a 10 second gate time by
pressing,
[GATE]
10
[GATE).
8. Offset the displayed frequency by -10.0 MHz by pressing,
MATH
CSELECT/ENTER)
C-1
10
[CHS/EEX)
6 [SELECT/ENTER)
SELECT/ENTER]. The Frequency Counter should now display the
difference between the frequency of the INPUT A signal
(A27
10 MHz Frequency Standard) and 10.0 MHz with a displayed
resolution of 1
mHz (0.001 Hz).
9. Wait at least two gate periods for the Frequency Counter to settle,
and record
the frequency of the
A27
10 MHz Frequency Standard
as reading
#l.
Reading 1:
mHz
10. Allow the spectrum analyzer to remain powered (not in
STANDBY) and undisturbed for an additional 24 hours.
11. Repeat steps 3 through 7 and record the frequency of the
A27
10
MHz Frequency Standard as reading
#2.
Reading 2:
mHz
12. If the difference between reading
#2
and reading
#l
is greater
than 1
mHz,
the
A27
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 the
end of each
24-hour
interval, until the specified aging rate of 1
mHz/day
(lxlOES/day)
is achieved.
Reading 3:
mHz
Reading 4:
mHz
Reading 5:
mHz
Reading 6:
mHz
Reading 7:
mHz
Reading 8:
mHz
Reading 9:
mHz
Reading 10:
mHz
13. Position the spectrum analyzer on its right side as shown
in Figure 3-52 and remove the bottom cover. Typically, the
frequency of the
A27
10 MHz Frequency Standard will shift
slightly when the spectrum analyzer is reoriented. Record this
shifted frequency of the
A27
10 MHz Frequency Standard.
Adjustments 3-97