A4 Log Fidelity Adjustment - Agilent Technologies 8564EC Service Manual

10.If the signal is higher than expected (delta marker amplitude reads
greater than −38 dB) then adjust A4R544 for an even higher level
signal and press
for the analyzer to complete the adjustment.
11.Repeat step 7 through

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
location.
2. Connect the E4421B RF output to the spectrum analyzer 50Ω input.
to turn the spectrum analyzer on.
Press
LINE
3. On the spectrum analyzer, press
and
ADJ CURR IF STATE
4. Set the spectrum analyzer controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 MHz
Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 dBm
5. Set up an E4421B as follows:
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 dBm
Mod On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off
6. On the spectrum analyzer, press
7. Decrease the E4421B power to −26 dBm.
8. Calculate the error:
Error
9. If the error is less than ±0.2 dB, no adjustment is necessary.
10.Set the E4421B power to −10 dBm.
11.Adjust A4R531 (see
example, if the calculated error is +0.75 dB, adjust A4R531 for a
delta marker amplitude reading of +1.5 dB. Press
ADJ CURR IF STATE
12.Repeat step 7 through
Chapter 3
Manual Adjustment Procedures: 3335A Source not Available
and
CAL ADJ CURR IF STATE
step 10.
Figure 3a-3. See
PRESET
.
MKR
= delta marker reading 16 dB
Figure 3a-4) to read two times the error. For
.
step 11.
3a . DC Log Amplifier Adjustments
. Allow sufficient time
Figure 3a-4 for adjustment
, ,
CAL IF ADJ ON OFF
and .
MARKER DELTA
–
and
CAL
(OFF),
173