Agilent Technologies E5070B, Руководство пользователя

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402 Chapter 12
Optimizing Measurements
Setting Port Extensions and Loss Values
Setting loss values
In addition to port extension, you can set loss values for each port. By correcting loss due
to port extension, more accurate measurement results are obtained.
There are two types of loss value settings: loss values at two frequency points for a
specified port, and a DC loss value. You can make these settings at the same time for each
port.
NOTE
You can set loss values channel by channel. Setting loss values for one particular channel
does not affect other channels.
1. Setting loss values
Step 1. Press or to activate the channel for which you want to set loss
values.
Step 2. Press .
Step 3. Press
Port Extensions
.
Step 4. Press
Loss
.
Step 5. Press
Select Port
to select the port for which you want to set a loss value.
Step 6. Press
Loss1 [OFF]
to toggle to
Loss1 [ON]
(enabled), and enter a loss value (
Loss1
) and a
frequency (
Freq1
).
Step 7. If you want to set loss at two frequency points, press
Loss2 [OFF]
to toggle to
Loss [ON]
(enabled), and enter a loss value (
Loss2
) and a frequency (
Freq2
).
Step 8. If you want to set loss values for other ports, repeat Step 5 to Step 7.
NOTE
When you specify two frequency points, set the lower frequency to Loss1, and the higher
one to Loss2.
Equation 12-2 Expression to calculate loss using Loss 1
Loss(f) Loss1
f
Freq1
--------------
⎝ ⎠
⎛ ⎞
×
=
Equation 12-3 Expression to calculate loss using Loss 1 and Loss 2
Loss(f) Loss1
f
Freq1
--------------
⎝ ⎠
⎛ ⎞
n
×
=
n
log
10
Loss1
Loss2
--------------
log
10
Freq1
Freq2
--------------
------------------------------ =