Keysight Technologies N9322C, Руководство пользователя, Страница: 132 / 214

Key Reference
Meas
124
Spectrum Emission Mask
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.
Avg Number
On Off
Set
Avg Number
to
On
to specify the number of measurement
averages used when calculating the measurement result. The
average will be displayed at the end of each sweep. Setting
Avg Number
to
Off
disables measurement averaging.
Key access:
Meas > SEM
Meas Type
Displays a menu to select a measurement reference type,
Total Pwr Ref
or
PSD Ref
.
Key access:
Meas > SEM
Ref Channel
Accesses the softkeys to change the reference channel
settings.
Key access:
Meas > SEM
Total Pwr Ref
When
Total Pwr Ref
is selected, the power in the
carrier is used as the reference in computing
the relative power values for the offsets.
PSD Ref
When
PSD Ref
is selected, the mean power
spectral density of the carrier is used in
computing the relative power spectral density
values for the offsets.
Chan Integ BW
Specifies the integration bandwidth used in
calculating the power in the main channel.
Chan Span
Specifies the span used in measuring the
power in the main channel.