A4 Linear Fidelity Adjustment - Agilent Technologies 8564EC Service Manual

Manual Adjustment Procedures: 3335A Source not Available
3a. DC Log Amplifier Adjustments
4. Set up an E4421B as follows:
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−18 dBm
Mod On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off
5. On the spectrum analyzer, press
for the analyzer to complete adjustments then press
6. Adjust A4R445 for maximum on-screen amplitude. Refer to
3a-4 for the location of A4R445.

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
location.
2. Connect the E4421B RF output to the spectrum analyzer 50Ω input.
Press to turn the spectrum analyzer on.
LINE
3. On the spectrum analyzer, press
,
1 of 3 AMPTD UNITS
4. Set the spectrum analyzer controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 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. Reduce the E4421B input power to −58 dBm.
8. If the delta marker amplitude reads −40 dB ±2 dB, no adjustment is
necessary.
9. If the signal is lower on the screen than expected (delta marker
amplitude reads less than −42dB) then adjust A4R544 (see
3a-4) for an even lower level and press
Allow sufficient time for the analyzer to complete the adjustment.
172
and
CAL
Figure 3a-3. See
PRESET AMPLITUDE
, , , and
dBm CAL IF ADJ ON OFF
PEAK SEARCH
CAL
, wait
ADJ CURR IF STATE
.
MKR
Figure
Figure 3a-4 for adjustment
, ,
LINEAR
(OFF).
and
MARKER DELTA
Figure
and
ADJ CURR IF STATE
Chapter 3
MORE
.
.