Agilent Technologies 8564EC Service Manual page 101

Manual Adjustment Procedures
3. DC Log Amplifier Adjustments
4. Set up an 3335A as follows:
Frequency ..................................................................... 15 MHz
Amplitude ................................................................... −18 dBm
5. Press ,
CAL ADJ CURR IF STATE
adjustments then press
6. Adjust A4R445 for maximum on-screen amplitude. Refer to
3-10 on page 123
A4 Linear Fidelity Adjustment
1. Press to turn the spectrum analyzer off. Remove the spectrum
LINE
analyzer cover and place the spectrum analyzer in the service
position as illustrated in
page 123 for adjustment location.
2. Connect the 3335A 50Ω output to the spectrum analyzer 50Ω input.
Press to turn the spectrum analyzer on.
LINE
3. Press
PRESET AMPLITUDE
,
CAL IF ADJ ON OFF
4. Press
PEAK SEARCH
5. Reduce the 3335A input power to −58 dBm.
6. If the delta marker amplitude reads −40 dB ±2 dB, no adjustment is
necessary.
7. If the signal is lower on the screen than expected ( delta marker
amplitude reads less than −42dB) then adjust A4R544 (see
3-10 on page 123) for an even lower level and press
. Allow sufficient time for the analyzer to complete the
IF STATE
adjustment.
8. If the signal is higher on the screen than expected ( delta marker
amplitude reads greater than −38 dB) then adjust A4R544 for an
even higher level signal and press
sufficient time for the analyzer to complete the adjustment.
9. Repeat steps 5 through 10.
A4 LOG Fidelity Adjustment
1. Press to turn the spectrum analyzer off. Remove the spectrum
LINE
analyzer cover and place the spectrum analyzer in the service
position as illustrated in
"DC Log Adjustment Locations,"
2. Connect the 3335 50Ω output to the spectrum analyzer 50Ω input.
Press to turn the spectrum analyzer on.
LINE
124
, wait for the analyzer to complete
.
MKR
for the location of A4R445.
Figure 3-9 on page
, ,
LINEAR MORE 1 of 3
(OFF).
, .
MARKER DELTA
CAL
Figure 3-9 on page
for adjustment location.
122. See Figure 3-10 on
,
AMPTD UNITS
,
CAL ADJ CURR
, . Allow
ADJ CURR IF STATE
122. See Figure 3-10,
Figure
, ,
dBm
Figure
Chapter 3