Chapter 3 149
Manual Adjustment Procedures
11 . External Mixer Amplitude Adjustment
6. If all conversion loss values equal 30 dB, skip to step 7, otherwise
continue to step a.
a. Refer to Table 3-10 on page 149 and press
⇓ or ⇓ to select a
frequency at which the conversion loss value does not equal
30 dB.
b. Use the spectrum analyzer front panel keys to set the conversion
loss value to 30 dB.
c. Repeat steps a and b for all frequencies having a conversion loss
value other than 30 dB.
7. Press
INSTR PRESET on the 8340A/B and set the controls as follows:
CW frequency ....................................................... 310.7MHz
Power level ............................................................... −30dBm
8. Connect the 8481D to the 11708A attenuator already connected to
the 8902A RF power connector. Zero and calibrate the 8902A/8481D
combination in log mode. Enter the power sensor 50 MHz cal factor
into the 8902A. Connect the power sensor, through an adapter, to the
SMA cable.
9. Adjust the 8340A/B
POWER LEVEL until the power displayed on the
8902A reads −30 dBm ±0.05 dB.
10.On the spectrum analyzer, press CAL, MORE 1 OF 2, SERVICE CAL
DATA, 3RD IF AMP, then CAL 3RD AMP GAIN.
11.Wait until the message ADJUSTMENT DONE appears in the active
function block and press EXT MXR REF CAL.
12.Disconnect the SMA cable from the power-sensor/adapter and
connect the cable to the spectrum analyzer IF INPUT.
13.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 ±0.17 dB.
14.Press PREV MENU, STORE DATA, and YES on the spectrum analyzer.
Table 3-10 Conversion Loss Data
Frequency (GHz) Conversion Loss (dB) (≠30 dB)
18
20
22
24
26
27
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