Agilent Technologies 8719ET Service Manual page 98

Adjustments and Correction Constants
Power Linearity Adjustment
3. Press
Scale Ref
and then press
x1
The displayed trace should be centered on the reference (±0.5 dB).
• If the trace is not centered on the reference, continue with the next step.
• If the trace is centered on the reference, go to
4. To switch on the power DAC, press the following:
System SERVICE MENU
SRC ADJUST MENU
5. Adjust the front panel knob until the mean value is P2. Record the "MAIN POWER
DAC" number.
6. To switch off the power DAC, press
7. Press
Save/Recall
8. Divide the previously recorded DAC number by 256.
9. To store the quotient, press the following:
SERVICE MENU
System
PEEK/POKE ADDRESS
Enter the quotient and then press
10.To store the remainder, press the following:
PEEK/POKE ADDRESS
Enter the remainder and then press
11.Press .
Preset
12.Press
Save/Recall
Entering the Power Levels
13.Enter the Power levels.
For 8719ET/ES and 8720ET/ES Models:
Press and enter the power level that is listed as "P2" in
Power
Press
x1 Cal
3-26
REFERENCE VALUE
.
SERVICE MODES
PWR DAC ON
PWR DAC OFF
.
SAVE STATE
PEEK/POKE
1619001444
x1
1619001445
x1
and verify the mean value is equal to "P2."
RECALL STATE
CALIBRATE MENU
and enter the value listed as "P2" in
"Entering the Power Levels."
2580 x1
.
POKE
x1
.
POKE
x1
.
RECEIVER CAL TAKE RCVR CAL SWEEP
8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
Table 3-4,
Table 3-4.
Service Guide
.