Agilent Technologies 8719ET Service Manual page 97

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
5. To switch on the power DAC, press
SRC ADJUST MENU
• For the 8719ET/ES or 8720ET/ES, press
• For the 8722ET/ES, press
6. Adjust the front panel knob until the mean value is equal to "P2". Record the "MAIN
POWER DAC" number.
(Example: Power DAC# = 461)
7. To switch off the power DAC, press
8. Press
Save/Recall
9. Divide the previously recorded DAC number by 256.
(Example: 461/256)
10.To store the quotient, press the following:
SERVICE MENU
System
PEEK/POKE ADDRESS
1619001442 x1
Enter the quotient and then press
(Example quotient = 1)
11.To store the remainder by press the following:
PEEK/POKE ADDRESS
POKE
x1
Enter the remainder and then press
(Example remainder = 205)
12.Press .
Preset
13.Press
Save/Recall
Adjusting the Power Linearity
1. Press and enter the power level that is listed as "P3" in
Power
Press
x1 Cal
2. Press and enter the power level that is listed as "P2" in
Power
then press .
x1
Service Guide
System
PWR DAC ON
459 x1
PWR DAC OFF
.
SAVE STATE
PEEK/POKE
POKE
x1
1619001443
x1
. Verify that the mean is equal to the "P2" value.
RECALL STATE
CALIBRATE MENU
Adjustments and Correction Constants
SERVICE MENU
.
.
258 x1
.
.
.
.
RECEIVER CAL TAKE RCVR CAL SWEEP
Power Linearity Adjustment
SERVICE MODES
Table 3-4.
Table 3-4,
3- 25
.