Agilent Technologies 8719ET Service Manual page 129

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
17.Press the following:
SERVICE MENU
System
PEEK POKE PEEK/POKE ADDRESS
1619001374 x1
Note the PEEK value displayed under the PEEK label.
18.Calculate the new value by adding the PEEK value to ∆ multiplied by 4.
new value = current value + (∆ X 4)
Round the new value to the nearest integer.
NOTE
19.Press and enter the new value into the poke address; press
Poke
20.To get the analyzer to use the new poke value, press
21.Press the following:
INPUT PORTS
Meas
CW FREQ
Sweep Setup
SERVICE MENU
System
x1 MARKER SEARCH
The maximum marker reading is MMR.
22.Recalculate ∆ by taking the test port power (TPP), adding 4 and then subtracting the
maximum marker reading (MMR).
∆ = (TPP + 4) − (MMR)
If the magnitude of ∆ is less than 0.15 dB, then the offset for the A channel is correctly
set. Go to "Sampler Calibration Correction Constants (Test 51)" on page
magnitude is greater than 0.15 dB, repeat steps 12 through 22 until the B channel raw
offset correction constant is achieved.
In Case of Difficulty
• Ensure that the power meter and power sensor are operating to specification.
• If you are unable to perform this adjustment, refer to
Troubleshooting,"
Service Guide
PEEK
B
and enter the frequency from step 13.
SERVICE MODES
SEARCH:MAX
or contact the nearest Agilent Technologies sales or service office.
Adjustments and Correction Constants
Raw Offset Correction Constants
x1
.
Preset
MORE SAMPLER COR OFF
Chapter 8 , "Receiver
.
3-58. If the
3- 57