Power Meter Remote Operation
1
Keysight N8262A Programming Guide
97
Output Format
The power meter has two output formats for measurement results:
ASCii
and
REAL
. These formats are selected using the
FORMat
command. When
FORMat
is set
to REAL, the returned result is in IEEE 754 floating-point format (note that the byte
order can be changed using
FORMat:BORDer
) plus <LF> as an end sentinel of the
block.
The
REAL
for mat is likely to be required only for
FAST
mode as it reduces the
amount of bus traffic.
Units
The power meter can output results in either linear or log units. The internal units
are linear, therefore optimal performance is achieved when the results output are
also in linear units (since the overhead of performing a log function is removed).
Command Used
In Free Run mode,
FETCh?
must be used to return a result.
In other trigger modes, there are a number of commands which can be used, for
example,
MEASure?, READ?, FETCh?
Note that the
MEAS?
and
READ?
commands
are compound commands—they perform a combination of other lower level
commands. Typically, the best speed performance is achieved using the low level
commands directly.
Trigger Count
To get the fastest measurement speed the a
TRIG:COUNT
must be set to return
multiple measurements for each
FETCh
command. For average only
measurements a count of 4 is required, however, 10 is recommended. In normal
mode (peak measurements) a count of 50 is required to attain 1000 readings per
second.
Summary of Contents for N8262A
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Page 668: ...17 IEEE 488 2 Command Reference 668 Keysight N8262A Programming Guide Syntax STB ...