Agilent Technologies 8719ET Service Manual page 128

Adjustments and Correction Constants
Raw Offset Correction Constants
Raw Offset for the B Channel (ET Models)
12.Connect the equipment as shown in
Figure 3-15 Setup for Calculating the Raw Offset for the B Channel (ET Models)
13.Press the following:
Preset
INPUT PORTS
Meas
Stop 10 G/n
SERVICE MENU
System
Marker Search SEARCH: MAX
Note the frequency and write it down.
14.Press
Sweep Setup
step 13.
Press
G/n Marker Search
(MMR) and write it down.
Press . Note the displayed test port power (TPP).
Power
15.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
16.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.
3-56
Figure
B
SERVICE MODES
, and enter the maximum frequency point from
CW FREQ
SEARCH: MAX
3-15.
MORE SAMPLER COR OFF
. Note the maximum marker reading
8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
3-58. If the
Service Guide