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Measure (Spectrum Analysis Mode)
14
Spectrum Emission Mask
The Spectrum Emission Mask measurement includes the in-band and out-of-band spurious
emissions. As it applies to W-CDMA (3GPP), this is the power contained in a specified
frequency bandwidth at certain offsets relative to the total carrier power. It may also be
expressed as a ratio of power spectral densities between the carrier and the specified offset
frequency band. For WLAN, the reference power is taken as the peak PSD in the signal, and
all offset results are also the peak PSD in that offset as opposed to the integrated power.
Offsets that are turned off (inactive) will return –999.0 when their results are queried over
SCPI.
For more information see “Meas Setup (Spectrum Emissions Mask—SEM)" on page 381.
Key Path:
MEASURE
Remote Command:
Measurement Results Available
Command / Condition
n
Results Returned
:CONFigure:SEMask
:INITiate:SEMask
N/A
Not Applicable
:FETCh:SEMask[n]?
:MEASure:SEMask[n]?
:READ:SEMask[n]?
Using Total Power
Reference
n=1 (or
not
specified)
Returns 60 comma-separated scalar results, in the
following order (70 when offset F is active):
1. Reserved for the future use, returns –999.0
2. Absolute power at the center frequency (reference) area
(dBm)
3. Reserved for the future use, returns –999.0
4. Reserved for the future use, returns –999.0
5. Reserved for the future use, returns –999.0
6. Reserved for the future use, returns –999.0
7. Reserved for the future use, returns –999.0
8. Reserved for the future use, returns –999.0
9. Reserved for the future use, returns –999.0
10.Reserved for the future use, returns –999.0.
1.Relative power on the negative offset A (dBc)
12.Absolute power on the negative offset A (dBm)
13.Relative peak power on the negative offset A (dBc)
14.Absolute peak power on the negative offset A (dBm)
15.Peak frequency in the negative offset A (Hz)
16.Relative power on the positive offset A (dBc)
17.Absolute power on the positive offset A (dBm)
18.Relative peak power on the positive offset A
(dBc)119.Absolute peak power on the positive offset A
(dBm)
20.Peak frequency in the positive offset A (Hz)
Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz
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