Tektronix SPECMON3 Manual page 421

Reference
Increase the Analysis Length to provide more samples.
Close any displays you don't currently need.
Not enough samples – try increasing MeasBW
The measurement was not able to run because there are not enough samples available for the measurement
to analyze. The Settling Time measurement requires at least 256 samples. This can occur when two or
more displays are shown and one display requires a wide acquisition bandwidth and another display
requires a much narrower bandwidth. The display requiring the much narrower bandwidth must decimate
and filter the acquisition record which can result in too few samples left for the measurement.
Increase the Analysis Length to provide more samples.
Close any displays you don't currently need.
No FFT (not all pulses have results)
If a pulse cannot be measured (because its shape is too indistinct or it does not meet the
define a pulse (see page
cannot compute an FFT.
No pulses found
The instrument was unable to find any complete pulses in the signal.
Make sure the
one rising edge until after the next rising edge.
Pulse Detection Error
The instrument was unable to detect a pulse.
The pulse Measurement Filter (see page 257)
selecting the Gaussian filter.
Detection threshold is not set to the proper level for the signal. Adjust the
pulses (see page
The pulse interval is too long for the current settings. Try decreasing the
page 257), as this may reduce the number of data points to a manageable quantity.
RBW conflict. Increase Span or Analysis Length
The measurement is not running because the actual RBW used by the measurement is too large for the
current acquisition span. Typically, the analysis length is too short as well.
Either increase the span or increase the Analysis Length.
RBW decreased
The current span or acquisition bandwidth is too small to allow a wider RBW filter.
Increase the span or acquisition bandwidth if the decreased RBW is not acceptable.
RBW increased
The current Spectrum Length (or Analysis Length if Spectrum Length is not Independent) is too small
to allow the requested RBW.
SPECMON3 & SPECMON6 Printable Help
257)), its results will be "- -" for every measurement on that pulse. The instrument
analysis length (see page 349)
257).
includes at least one complete pulse cycle, from before
needs to be smaller. Try reducing the bandwidth and/or
Error and Information Messages
parameters that
Power threshold to detect
filter bandwidth (see
409