Shaper DAC
Adjustment
The following step in the procedure adjusts the
Switch Filter Shaper DAC which controls the gain of
the Switched Filter Shaper Amplifier. Each fre-
quency band will be scanned for the minimum un-
leveled power point before automatic adjustment of
the shaper DAC.
1. At the
$
prompt on the PC display, type:
calterm 138
and press <ENTER>. (The
$
prompt will appear on the screen when the cali-
bration is complete.)
NOTE
The calibration routine may take up to 20
minutes depending on the frequency range
of the 690XXB/691XXB being calibrated.
2. 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.
4-22
690XXB/691XXB MM
CAUTION
When saving calibration data, turn-
ing off the instrument before the
$
prompt returns to the screen can
cause all stored data to be lost.
SWITCHED FILTER
CALIBRATION
SHAPER CALIBRATION
Summary of Contents for 680 C Series
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