3-54 Service Guide
Adjustments and Correction Constants 8719ET/20ET/22ET
Raw Offset Correction Constants 8719ES/20ES/22ES
RF Network Analyzers
18.Press and enter the new value into the poke address; press .
19.To get the analyzer to use the new poke value, press .
20.Press the following:
and enter the frequency from step 12.
The maximum marker reading is MMR.
21.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 B channel is correctly
set. Go to “Sampler Calibration Correction Constants (Test 51)” on page 3-58. If the
magnitude is greater than 0.15 dB, repeat steps 12 through 21 until the B channel raw
offset correction constant is achieved.
Raw Offsets for the A and B Channels (ET Models)
1. Connect an open to the REFLECTION port.
2. Press the following:
Note the maximum frequency and write it down.
3. Press , and enter the maximum frequency point from step 2.
Press . Note the maximum marker reading
(MMR) and write it down.
Press . Note the displayed test port power (TPP) and write it down.
Poke x1
Preset
Meas
System
x1
Preset
Meas
Stop 10 G/n
System
G/n
Power
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