Anritsu 682XXB, 683XXB calterm 138 , 4-20 682XXB/683XXB MM

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
POWER.
g. Press OFFSET/RESOLUTION.
b. Set Resolution to 5 dB/Div.
c. Adjust Offset to center the display.
2. Adjust the Switched Filter Shaper DAC for each
of the frequency bands as follows:
a. At the $prompt on the PC display,type:
calterm 138 and press <ENTER>.
NOTE
At the start of each frequency band, there
will be a delay while the minimum unlev-
eled power point is determined.
b. On the computer keyboard, use 1, 2, or 3 to in-
crement and 8, 9, or 0 to decrement the value
of the DAC’ssetting to adjust the triangle
waveform being displayed on the 562 Network
Analyzer (Figure 4-5) for the most linear re-
sponse.
There will be a delay while the amplifier com-
pression point is determined and after each
key stroke as the DAC is adjusted.
c. When the DAC has been adjusted for the cur-
rent frequency band, press Qon the keyboard
to go to the next frequency band.
d. Repeat steps b. and c. until the DAC has been
adjusted for all frequency bands.
e. Press Qon the keyboard to exit the program.
(The $prompt will appear on the screen.)
f. Record step completion on the TestRecord.
3. Store the calibration data in non-volatile memory
(EEPROMs) on the A17 CPU PCB as follows:
a. Type:calterm 787 and press <ENTER>.
(The $prompt will appear on the screen when
the data has been stored.)
b. Record step completion on the Test Record.
4-20 682XXB/683XXB MM
SWITCHED FILTER
CALIBRATION SHAPER CALIBRATION
CAUTION
Whensaving calibration data, turn-
ing off the instrument before the $
prompt returns to the screen can
cause all stored data to be lost.
Decrement
DAC
Setting
Correctly
Adjusted
Increment
DAC
Settings
Figure 4-5. ShaperDAC Adjustment
WaveformExamples