Chapter 4
Using Spectrum Analyzer
JD700B Series User’s Guide
85
Spectrum emission mask (SEM)
The Spectrum Emission Mask (SEM) measurement is to identify and determine the power level of out-of-
band spurious emission outside the necessary channel bandwidth and modulated signal. It measures the
power ratio between in-band and adjacent channels. The JD700B series indicates either Pass or Fail based
on the specified limit of the signal.
Setting measure setup
After configuring test parameters, you can set the measure setup to continue your measurement. The
measurement settings can be saved and recalled as a file. You can also use JDViewer, PC application
software to configure a measure setup, save as a file, and load the file on to the instrument.
Procedure
1
Configure test parameters as described in the “Configuring test parameters” on page 68.
2
Press the
MEASURE SETUP
hot key.
3
Set the main channel bandwidth to be measured:
Press the
Main Channel BW
soft key.
Enter a value by using the numeric keys. You can also use the rotary knob.
Select the unit:
MHz
,
kHz
, or
Hz
.
4
Set the frequency range over which the instrument will sweep:
Press the
Span
soft key.
Enter a span frequency value by using the numeric keys. You can also use the rotary knob.
Select the unit:
GHz
,
MHz
,
kHz
, or
Hz
.
5
Set the number of measurements to be averaged:
Press the
Average
soft key.
Enter a value between 1 and 100, and then press the
Enter
soft key.
6
To configure an offset, up to five, complete the following steps:
Press the
Offset/Limit
soft key.
The Offset/Limit menu bar appears.
Press the
Offset
soft key, and then select the number for the active offset to configure.
Toggle the
Offset
soft key and select
On
to display or
Off
to hide the active offset.
Press the
Offset Frequency
soft key to set the center frequency of the offset.
Enter a value by using the numeric keys. You can also use the rotary knob.
Select the unit:
MHz
,
kHz
, or
Hz
.
Press the
Measurement Bandwidth
soft key to set the bandwidth for the selected offset.
Enter a value by using the numeric keys. You can also use the rotary knob.
Select the unit:
MHz
,
kHz
, or
Hz
.
Toggle the
Reference
soft key between Relative and Absolute and select
Relative
or
Absolute
depending on how to use the reference.
7
To define the selected offset’s limits for Pass/Fail indication, complete the following steps:
Press the
Start Offset Limit
soft key to set the threshold for the power difference between
the main channel bandwidth and the selected offset bandwidth on the left.
Enter a value by using the numeric keys. You can also use the rotary knob.
Select the
dB
soft key.
Press the
Stop Offset Limit
soft key to set the threshold for the power difference between
the main channel bandwidth and the selected offset bandwidth on the right.
Enter a value by using the numeric keys. You can also use the rotary knob.
Select the
dB
soft key.
Содержание CellAdvisor JD700B Series
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