3 VMA Mode
3.4 IQ Waveform Measurement
Remote Command Results
For the :FETCh, :MEASure and :READ queries above, the results returned depend
on the n parameter value as follows:
n Results Returned
0 Returns unprocessed I/Q trace data, as a series of trace point pairs, in Volts
Each pair consists of an I value (even-indexed, starting at 0), followed by a Q value (odd-indexed)
1 Returns the following scalar results:
# Item Unit, if
any
1 Sample Time
A floating-point number representing the time between samples. This value is
important when analyzing signal results (that is, when you send a query using n = 0, 2,
etc.)
2 Mean Power
The power across the entire trace. If Averaging State is ON, as set by "Avg/Hold
Number (Averaging On/Off)" on page 757, the power is for the latest acquisition
dBm
3 Mean Power Averaged
The power across the entire trace
If Averaging State is ON, the power for N averages (the latest acquisition), as set by
"Avg/Hold Number (Averaging On/Off)" on page 757
If Averaging State is OFF, the value of the mean power averaged is the same as the
value of the mean power
dBm
4 Number of samples
The number of data points in the captured signal. This value is important when
analyzing signal results (that is, when you send a query using n = 0, 2, etc.)
5 Peak-to-mean ratio
The ratio of the maximum signal level to the mean power. Valid values are only
obtained with Averaging State OFF. If Averaging State is ON, the peak-to-mean ratio is
calculated using the highest peak value, rather than the displayed average peak value
dB
6 Maximum value
The maximum of the most recently acquired data
dBm
7 Minimum value
The minimum of the most recently acquired data
dBm
2 Returns trace point values of the entire captured signal envelope trace data
Floating-point numbers, representing the power of the signal (in dBm). There are N data points, where N is the
number of samples. The period between the samples is defined by the Sample Time (see n = 1 above)
3 Returns unprocessed I/Q trace data, as a series of trace point values, in volts
The I values are listed first in each pair, as the even-indexed values (starting at 0). The Q values are odd-indexed.
The number of points returned is defined by "Meas Time" on page 760 * "Sample Rate" on page 760, and is one
point less than index 0
673 Vector Modulation Analyzer Mode User's &Programmer's Reference
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