Power Meter Remote Operation 1
N1911A/1912A P-Series Power Meters Programming Guide 47
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 format 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.
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