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Trace/Detector
Trace Update Indicator
Trace updates can take one of two forms:
The trace is updated in a single operation that affects all of the points in the trace at once. This happens,
for example, in the case of very fast (< 200 ms) sweeps, single-chunk FFT’s, and the initial math
operation after a math function is set for a trace.
The trace is updated in a series of discrete steps, with measurement data being gathered between each
step. This is the case for slow sweeps, multi-chunk FFT’s, et cetera.
In the first case, no update indicator is required. In the second case, however, a visual indicator exists on
the trace where the new data is being written, a green “caret” or ^ symbol, which moves across the
bottom of the graticule showing the current trace point.
Trace Annunciator Panel
The trace annunciator panel appears on the right hand side of the Meas Bar. Here is an explanation of the
fields in this panel:
On the line labeled “TRACE”, each trace number is shown, in the trace color. A green box is drawn
around the currently selected trace
Below each trace number, on the line labeled “TYPE”, is a letter signifying the trace type for that trace
number, where
W = Clear Write
A = Trace Average
M = Max Hold
m = Min Hold
If the letter is white it means the trace is being updated (
Update = On); if the letter is dimmed, it means
the trace is not being updated (
Update = Off). A strike through (for example, W) indicates that the trace
is blanked (
Display = Off). Note that it is possible for a trace to be updating and blanked, which is useful
if the trace is a trace math component.
The third line, labeled “DET”, shows the detector type for each trace, or, if trace math is on for that trace,