User`s guide

Agilent PXT Wireless Communications Test Set
User’s Guide
193
Selecting Exponential means that once the averaging count is reached the measurement will continue
averaging the same number of results by adding the latest sample and deleting the oldest sample.
Instead of averaging, the measurement can be set for Max Hold. Turning Max Hold disables averaging and
vice versa.
Measurement Markers
General Purpose Measurement Markers are supported by the following measurements:
• Spectrum (Spectrum and LTE mode)
• Channel Power (Spectrum and LTE mode)
• Occupied Bandwidth
• PVT
• SEM
• ACLR
Specific markers are available in other measurements as described in the measurement.
Markers function in the same way in both spectral and time domain measurements.
Select Marker
Selects the active marker. The marker selections are Normal, Delta or Fixed. Markers may be disabled
individually using the Off menu key or collectively using the All Markers Off menu key.
Key Path:
Function > Marker
Normal
The marker frequency / time defaults to the centre frequency / 0ms point. The marker frequency / time
may be set to any absolute frequency / time value. The marker value will track the trace value at the
marker frequency / time on each measurement pass. The marker value is in dBm.
Fixed
The marker frequency defaults to the centre frequency / 0ms point. The marker frequency / time may be
set to any absolute frequency / time value. The marker value will hold the trace value at the marker
frequency / time from the first measurement pass after the marker mode is set to Fixed. The marker value
is in dBm. The fixed marker frequency / time and marker value can be edited if required: in the Fixed
Marker menu, X refers to the marker frequency / time and Y refers to the power value.
Delta
The next marker after the active marker becomes the reference for the active marker. For example, if
Marker 3 is the active marker, Marker 4 becomes the reference for Marker 3. Marker 3’s frequency / time
value is then the frequency difference between Marker 3 and Marker 4; and Marker 3’s value is the power
difference between Marker 3 and Marker 4. If the last marker which is on is the active marker, Marker 1
becomes its reference.
If when Delta mode is selected for the active marker, the next marker is Off, the next marker will be turned
on as a Fixed marker. If the next marker is already on, its marker mode will remain unchanged. If the next
marker is a Delta marker, the next again marker effectively becomes the reference for the active marker.