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ALC Slope
DAC
Adjustment
The following procedure lets you adjust the ALC
Slope over individual frequency ranges to compen-
sate for decreasing output power-vs-frequency in
analog sweep.
The procedure begins by letting you adjust the ALC
Slope for band 0 (0.01 to 2.0 GHz), if installed. It
then continues letting you adjust the ALC Slope
from 2 GHz to the top frequency of the instrument
in up to four bands. The band frequency ranges are:
Band 1
2.0 to 8.4 GHz
Band 2
8.4 to 20.0 GHz
Band 3
20.0 to 40.0 GHz
Band 4
40.0 to 65.0 GHz
During band 1 thru 3/4 ALC Slope adjustment, the
56100A Network Analyzer display (Figure 4-6)
shows the response from 2 GHz to the top frequency
of the model, as adjustment is done band by band.
1. Set up the 56100A Network Analyzer as follows:
a. Press the System Menu key.
b. From the System Menu display, select
RESET
.
c. Press
CHANNEL 2 DISPLAY: OFF
.
d. Press
CHANNEL 1 DISPLAY: ON
.
e. Press
CHANNEL 1 MENU
key.
f. From the Chanel 1 Menu Display, select
TRANSMISSION
and
SELECT INPUT
(NON-RATIO A)
.
2. Set up the 691XXB as follows:
a. Reset the instrument by pressing
SYSTEM
then
Reset
. Upon reset the CW Menu is dis-
played.
b. Press
Step
. The Step Sweep Menu is dis-
played.
c. Press
FREQUENCY CONTROL
, then
Full
to
select the full frequency range of the unit being
calibrated.
d. Press
CW/SWEEP SELECT
to return to the
Step Sweep Menu display.
e. Press
Sweep Ramp
. At the resulting Step
Sweep Ramp Menu, press
Num of Steps
and
set the number of steps to 400.
690XXB/691XXB MM
4-25
ALC SLOPE
CALIBRATION
CALIBRATION
NOTE
For units with Option 21A installed,
the frequency ranges for Band 0 and
Band 1 are 0.01 to 2.2 GHz and 2.2 to
8.4 GHz respectively.
Summary of Contents for 680 C Series
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