N9069C Noise Figure Measurement Guide 81
Measurement Related Tasks and Concepts
Setting the Signal Analyzer to Make a Measurement
Setting Temperature of Loss
Any device (cables, connectors and so forth) that causes a loss will also
generate excess noise. The amount of excess noise so generated is
proportional to the absolute temperature of the device causing the loss. You
must compensate for this excess noise in the measurement, and this is done by
specifying the temperature of the device. To set the temperature of the device
causing the loss, proceed as follows:
To set the temperature of loss,
Press
MEAS SETUP
,
Loss Comp
tab,
Before DUT
or
After DUT
,
Temperature
,
then enter a value using the numeric keypad and press
Enter
. The lower limit is
0.0 K, the upper limit is 29,650,000.0 K. The default is 290.0 K.
5.
Repeat steps 3 to 4 until all the Loss
Frequency and Loss Values you need are
entered.
You can insert the Loss Frequency and Loss Values in the
Loss Compensation Table in any order, as the Noise Figure
Measurement Application automatically sorts the table list
into ascending frequency order.
The Loss Compensation Table data is stored in CSV (Comma Separated
Value) format. It is sometimes more convenient to use a text editor to edit
or enter this data rather than to enter the data manually using the
analyzer. Start by saving a table with at least one loss compensation value
to memory, and then edit or add to the saved file.
Step
Notes
The temperature you specify here is used both for
Fixed
loss
compensation, and for all frequencies specified in a loss compensation
Table
.
Summary of Contents for CXA N9000B
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