Max Hold - Keysight x-series User Reference Manual

10 Monitor Spectrum Measurement
Trace/ Detector
Averaging is always done on the Voltage scale, meaning that the averaging process works on the voltage
of the envelope of the signal. In the equation for averaging on this scale (below), K is the number of
averages accumulated.
New avg = 20 log ((1/K)((K–1)(10Old avg/20)+10New data/20))
This equation assumes all values are in the decibel scale. Note that in continuous sweep mode, once K
has reached 10, then K stays at that value for subsequent sweeps. In single sweep mode, once K has
reached 10, the sweep stops.
Key Path
Example
Notes
Couplings
Preset
State Saved
Initial S/W Revision

Max Hold

In Max Hold type the analyzer maintains and displays a max hold trace, which represents the maximum
data value on a point-by-point basis of the new trace data and previous trace data.
Pressing the Max Hold key for the selected trace, or sending the :TRAC:TYPE MAXH command for the
specified trace, sets the trace type to Max Hold, causes the trace to be cleared, and causes the Max Hold
sequence to be (re)started, even if you are already in Max Hold.
Pressing Restart does not restart the Max Hold.
When in Max Hold, if a "Force restart" setting is changed, the trace is cleared and a new sweep is initiated.
Key Path
Example
Preset
State Saved
Initial S/W Revision
868
Trace/Detector
:TRAC2:MON:TYPE AVER
Pressing the Trace Average key (for the selected trace), or sending the TRAC:TYPE AVER command
(for the specified trace), sets the trace type to Trace Average and causes the average to be restarted.
Restarting the average means:
• The average/hold count k is set to 1, so that the next time the average trace is displayed it simply
represents one trace of new data
• A new sweep is initiated.
• Once the new sweep starts, the trace is overwritten with current trace data as the first trace of
the new average
Whenever you press Trace Average or send the equivalent SCPI command, Update is set to On and
Display is set to On.
After a Preset, any trace that is in Trace Average is cleared (all trace points set to mintracevalue).
The type for each trace is saved in Instrument State
A.13.00
Trace/Detector
:TRAC3:MON:TYPE MAXH
After a Preset, any trace that is in Max Hold is cleared (all trace points set to mintracevalue).
The type for each trace is saved in Instrument State
A.13.00
EMI Receiver Mode Reference