Tektronix RSA6100A Series, Help Manual

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General Signal Viewing > DPX Spectrum Traces Tab
Option 200 Traces tab
Setting Description
Trace drop-down list Selects which trace to con fi gure. For standard instruments, the available traces are
Bitmap, +Peak detected, -Peak detected, Average, and Math. In instruments with Option
200, the available traces are Bitmap, Trace 1, Trace 2, Trace 3, and Math.
Show Speci fi es whether or not the trace shown in the Trace setting is displayed.
Freeze Halts updates to the selected trace.
Detection (Option 200 only) Sets the Detection method used for the trace. Not available for saved traces. Available
detection methods are +Peak, -Peak, and Avg (VRMS) Not all detection methods are
available in all displays.
Function Selects the trace processing method. Available settings are: Normal, Average, and Hold.
Save Trace As... Saves the selected trace to a fi le for later recall and analysis.
Show Recalled Trace Displays a saved trace instead of a live trace.
Count Enables user adjustable number of averages . This setting is only present when Function
= Average.
xxx
Detection
Trace Detection occurs when the trace is being decimated by the measurement. For example, if the
maximum number of trace points is 100,000, and the selected analysis region is 200,000 samples, the
measurement must decimate the 200,000 resulting trace points by 2 to prevent exceeding the 100,000 trace
point limit. Since only one value can be selected for each trace point, an algorithm must be used to select
(detect) the appropriate value to use.
The available detection methods are:
+Peak – Each point on the trace is the result of detecting the positive peak value present in the set of
IQ samples available to that trace point.
-Peak – Each point on the trace is the result of detecting the negative peak value present in the set of
IQ samples available to that trace point.
Avg (VRMS) [Average V
RMS
] – Each point on the trace is the result of determining the RMS Voltage
value for all of the IQ samples available to the trace point. When displayed in either linear (Volts,
Watts) or Log (dB, dBm), the correct RMS value results. When the averaging function is applied to a
trace, the averaging is performed on the linear (Voltage) values, resulting in the correct average
for RMS values.
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RSA6100A Series Real-Time Spectrum Analyzers Help