Agilent Technologies ESA-E Series User And Programming Manual page 94

Front-Panel Key Reference
Det/Demod
Alpha / BT Allows you to use the numeric keypad to determine the filter shape of the Nyquist
and Gaussian filters. Alpha, sometimes called 'excess bandwidth factor', applies
only to Nyquist filters and BT ('Bandwidth Time' product) applies only to
Gaussian filters. This key is grayed out for all filters that are neither Nyquist nor
Gaussian.
Burst Accesses the Burst menu, allowing you to set the search threshold level and the
search length
Search Threshold
Search Length
IQ Invert
This inverts the quadrature-phase component of the signal.
Wideband Cal
This allows you to effectively perform a factory calibration on the instrument prior
to doing an EVM measurement. As the instrument is calibrated before leaving the
factory, it should only need to be done after new firmware has been installed.
To perform the calibration, first select
a diagram showing the cable connection you have to make. Once you have
connected a cable from the
diagram), select Continue. The instrument calibration is complete once the
instrument returns to previous measurement screen.
NOTE If an alignment is required, pressing Continue will cause the alignment to be
performed before the Wideband Calibration.
NOTE Don't forget to remove the cable from the
your DUT upon completion of the Wideband Cal procedure.
Opt Freq Ref
This allows you to select and set the reference oscillator for your EVM
measurements.
external reference oscillator. The frequency of the external oscillator can be set at
any time, regardless of whether you have selected the internal or the external
oscillator. However, it only has an effect when you set the instrument to use the
external oscillator.
Int
Ext
80
Allows you to set the burst power threshold relative to the
signal's peak power. This is used by the alignment algorithm
when Burst Sync = RF Amptd
which can be entered in either of two ways. To enter a value of
-10 dB, for example, either select
, , or select
Threshold -10 dB
Threshold , 10 , -dB
Allows you to specify the length of time over which the burst
search is performed
Wideband Cal
Cal Output
selects the internal reference oscillator and
Int
Selects the internal reference oscillator
Selects an external reference oscillator
. All settings are in negative dB
Det/Demod
,
Det/Demod Burst
. The instrument will display
Ω (as shown in the screen
to the Input 50
Cal Output connection and reconnect
Ext
, Burst , Search
,
Search
selects the
Chapter 6