Anritsu 682XXB - Manual (Page 134)

NOTE
Before beginning this calibration proce-
dure, always let the 683XXB warm up for a
minimum of one hour.
ALC Slope
DAC
Adjustment The following procedure lets you adjust the ALC
Slope DAC to compensate for decreasing output
power-vs-frequency for frequencies
£2 GHz and for
frequencies >2 GHz.
1. Set up the 562 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 Channel 1 Menu display, select
TRANSMISSION and SELECT INPUT
(NON-RATIO A).
Note
For instruments that do not produce fre-
quencies of <2 GHz, skip to step 6.
2. Set up the 683XXB as follows:
a. Reset the instrument by pressing SYSTEM
then Reset . Upon reset the CW Menu is dis-
played.
b. Press Edit L1 and set L1 to 5 dB less than
maximum leveled power for the instrument be-
ing calibrated (refer to Table 3-2, page 3-6).
c. Press Step . The Step Sweep Menu is dis-
played.
d. Press Edit F1 and set the F1 start frequency
to 0.01 GHz.
e. Press Edit F2 and set the F2 stop frequency to
2.1 GHz.
f. Press Sweep Ramp . At the resulting Step
Sweep Ramp Menu, press Num of Steps and
set the number of steps to 200.
g. Press Step to return to the Step Sweep Menu
display.
4-24 682XXB/683XXB MM
ALC SLOPE
CALIBRATION CALIBRATION