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Boonton 4540 Series RF Power Meter
Remote Operation
5-72
5.6.14 TRACe Data Array Commands
The TRACe group of commands is used to control the output of acquired measurement arrays, which appear as a display
trace when the power meter is in Graph mode. The
TRACe
commands allow outputting a channel’s entire internal display
trace (501 measurement points) as one large array, or selecting and returning the array in smaller portions. These commands
are useful for capturing the displayed waveform and importing it into a database on the host.
TRACe[:AVERage]:DATA[:NEXT]?
Description:
Return a delimited array of power or voltage pixel average values corresponding to all or a portion
of the graph mode display trace for the selected channel. Note that graph mode does not have to
be active to read the trace, and the pixel values are returned without regard to display vertical scale
and center settings. The array will consist of COUNT trace pixel values, beginning at pixel
number INDEX, up to the last pixel of the trace (index = 500), and will be returned in channel
units. The selected channel must be ―
ON‖
to return measurement data.
Syntax:
TRACe[1|2][:AVERage]:DATA[:NEXT]?
Returns:
P(index), P(index+1), P(index+2).... P(index+count) or
V(index), V(index+1), V(index+2).... V(index+count)
Valid Modes:
All
TRACe:COUNt
Description:
Set or return the number of trace points, which will be returned each time the
TRACe:DATA?
query is issued. At the completion of each read, INDEX is automatically incremented by
COUNT. If COUNT is set to a number greater than the number of points remaining in the trace,
the array will be truncated. Setting COUNT to 501 (and INDEX to zero each time) will return the
entire trace array.
Syntax:
TRACe[1|2]:COUNt <numeric_value>
Argument:
<numeric_value> = 1 to 501
Valid Modes:
All
TRACe:INDEX
Description:
Set or return the array index for the first trace point to be returned next time the
TRACe:DATA?
query is issued. Index 0 is the start of the trace buffer, and corresponds to the leftmost pixel on the
graph display. Index 500 is the last point, and is the rightmost pixel. Each time a block of data is
read, INDEX is automatically incremented by the COUNT value, so the full array can be split up
into blocks of manageable size and read with successive
TRACe:DATA?
queries. INDEX must
be reset to zero for each new trace that is to be dumped, whether or not all the points have been
read.
Syntax:
TRACe[1|2]:INDEX <numeric_value>
Argument:
<numeric_value> = 0 to 500
Valid Modes:
All
Summary of Contents for 4541
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