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8.
9.
10.
11.
12.
13.
14.
15.
15. External Mixer Amplitude Adjustment (Non-Option 327)
Table 2-12. Conversion Loss Data
Frequency (GHz)
18
20
22
Conversion Loss
(dB)
(230
dB)
24
26
27
Connect the HP 8481D to the HP 11708A attenuator already connected to the HP 8902A
RF power connector. Zero and calibrate the HP
8902A/HP
8481D combination in log
mode. Enter the power sensor 50 MHz cal factor into the HP 8902A. Connect the power
sensor, through an adapter, to the SMA cable.
Adjust the HP
8340A/B
(POWER LEVEL) until the power displayed on the HP 8902A reads
-30
dBm
f0.05 dB.
On
the spectrum
analyzer,press
[CAL),
MORE
I
OF 2, SERVICE CAL DATA,
3FtD
IF AMP,
then CAL
3RD
AMP
GAIN.
Wait until the message ADJUSTMENT DONE appears in the active function block and press
EXT
MXR
REF
CAL .
Disconnect the SMA cable from the power-sensor/adapter and connect the cable to the
spectrum analyzer IF INPUT.
Use the spectrum analyzer front-panel knob, step keys, or keypad to change the amplitude
of the displayed signal until the marker reads 0
dBm
f0.17 dB.
Press
PREV
MEHJ
, STORE DATA, and
y%S
on the spectrum analyzer.
Place the WR
PROT/
WR
ENA
jumper on the A2 controller assembly in the WR PROT
position.
Note
The following steps should only be performed if you need to replace the 30 dB
conversion loss values to those recorded in Table 2-12.
16. Press
(mCTRL),
EXTERNAL MIXER,
AMPTD
CORRECT,
then CNV LOSS VS
FREQ
on the
spectrum analyzer.
17. Press
a
or
a
to select frequencies where the conversion loss value was recorded in
Table
2-
12.
18. Use the spectrum analyzer front panel keys to enter the conversion loss values recorded for
the frequency.
Adjustment Procedures 2-59