Agilent Technologies 8719ET Service Manual page 125

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
Raw Offset for the B Channel (ES Models)
12.Press the following:
Preset
INPUT PORTS
Meas
TESTPORT 1
Stop 10 G/n
SERVICE MENU
System
SEARCH: MAX
Marker Search
Note the frequency and write it down.
13.Press
Sweep Setup
step 12.
Press
G/n Marker Search
(MMR) and write it down.
Press . Note the displayed test port power (TPP) and write it down.
Power
14.The objective is to set the maximum marker reading (MMR) to 4 dB higher than the
power meter reading. Perform the following mathematical operation.
a. Calculate the difference (∆) between the test port power meter reading (TPP) and the
maximum marker reading (MMR) and then add 4.
∆ = (TPP + 4) − MMR
The ∆ can be a positive or negative value.
NOTE
15.If the magnitude of ∆ is less than 0.15 dB, then the offset for the B channel is correctly
set. Go to "Sampler Calibration Correction Constants (Test 51)" on page
magnitude is greater than 0.15 dB, continue to the next step.
16.Press the following:
SERVICE MENU
System
PEEK POKE PEEK/POKE ADDRESS
1619001374 x1
Note the PEEK value displayed under the PEEK label.
17.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
Service Guide
B
SERVICE MODES
, and enter the maximum frequency point from
CW FREQ
SEARCH: MAX
PEEK
Adjustments and Correction Constants
Raw Offset Correction Constants
MORE SAMPLER COR OFF
. Note the maximum marker reading
3-58. If the
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