Filter
Top Products
4. IF Amplitude Adjustments
18. Note the AMKR amplitude. Ideally, it should read 50.00 dB fO.l dB.
19. If the AMKR amplitude is less than 49.9
dB,
rotate A5R343 15 dB
ATTEN
one-half turn
counterclockwise for each 0.1 dB below 50.00 dB. If the AMKR amplitude is greater than
50.1
dB,
rotate A5R343 15 dB
ATTEN
one-half turn clockwise for each 0.1 dB above
50.00 dB. Do not adjust A5R343 more than five turns before continuing with the next
step.
20. Press
ADJ
CURR
IF STATE on the spectrum analyzer. Note the AMKR amplitude
reading.
21. Repeat steps 11 through 20 until the AMKR amplitude reading is 50.00 dB fO.l dB.
A5
Adjustment
Verification
22. On the spectrum analyzer, disconnect W29 from
A5J3.
Connect the test cable between
A5J3 and the 50
R
output of the HP 3335A.
23. Set the spectrum analyzer reference level to -10
dBm.
24. Set the HP 3335A
(m)
to -5
dBm.
25. Press
[MKR)
and
l4ARKER
NORMAL on the spectrum analyzer.
26. The MARKER amplitude should read -10
dBm
f0.13 dB. If the reading is outside of
this range, repeat steps 4 through 21.
27. On the spectrum analyzer, reconnect W29 to
A5J3.
Press
(PRESET)
and set the controls as
follows:
Center frequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz
Span
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz
Reference level
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10
dBm
Resolution bandwidth
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz
28. Connect a BNC cable between the HP 85633 CAL OUTPUT and INPUT
5Os1.
29. On the spectrum analyzer, press
[MKR)
ICAL)
and
REF
LVL
ADJ .
30. Use the knob or step keys to adjust the REF LEVEL CAL setting until the MKR reads
-10.00
dBm
fO.l dB.
31. On the spectrum analyzer, press STORE REF LVL .
Adjustment Procedures 2-29