Chapter 4 Channel Power Operation
Changing the input impedance
9102 Handheld Spectrum Analyzer Software version 5.31
93
Turning external device
compensation off
1 In the main menu, select Level.
2 Push
Ext. Dev. Comp. until “Off” is highlighted.
The text “Ext. Dev.” to the left of the results display disappears.
Deleting files for external
device compensation
You can delete files containing compensation parameters as follows:
1 In the main menu, select
Level > Ext. Dev. Memory.
2 a. To delete an individual compensation file from the 9102 memory,
press
Delete Ext. Dev. Comp. Select a file name and press ENTER.
The compensation file is deleted from the list. Note that there will
be no warning; once you have selected and requested a file to be
deleted, this will occur immediately.
b. To delete all the compensation files from the 9102, push
Delete
All
and confirm by pressing ENTER.
All compensation files are deleted.
Changing the input impedance
Most RF applications are using an impedance of 50 other applica-
tions such as cable TV apply 75 The 9102 is designed with an input
impedance of 50 it can, however, be used for testing a device with
an impedance of 75 by using the software impedance switch. The
measurement results from the 50 input are recalculated to fit the
different impedance.
On the 9102, simply select the correct impedance value so that the
9102 can translate the internal measurement values to the power
before the coupler.
1 To connect a 75 device, connect the device under test to the
9102 Handheld Spectrum Analyzer.
2 In the main menu, select
Level.
3 In the vertical menu, select the impedance of the device, that
means select
Impedance: 50 or Impedance: 75 , respectively.
New measurement results are presented with the new impedance
value taken into account. In addition, if the impedance is changed
to 75 and the power had been displayed in dBm, the new
measurements are shown in dBμV. If the impedance is changed to
50 and the power had been displayed in dBμV, the new
measurements are shown in dBm.
NOTE
Signal reflections on the cable between the 50 and the 75
device affect the measurement accuracy of the 9102 Handheld
Spectrum Analyzer. For more accurate results, Aeroflex recom-
mends using an impedance converter; such a converter will cause
attenuation affecting the results. This attenuation can be compen-
sated as explained in section “Compensating gains and losses” on
page 92.
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