See table 6-1 to determine the number of values (display points) with variable resolution. The
CALC:DATA:HEAD:POIN? query returns the number of values along the specified display’s X-axis.
Refer to the CALC:X:DATA? query for information on retrieving X-axis values.
This query has no command form. Therefore, you cannot return trace data to the display with
CALC:DATA. To send data that has not been transformed, use the TRAC:DATA command. See the
introduction to this chapter for more information about the differences between these commands.
For more information about transferring block data, see Appendix F, “Example Programs,” or the GPIB
Programmer’s Guide.
Table 6-1. Number of displayed data points in variable resolution
FFT Instrument Mode
Resolution
Baseband Zoom
Number of frequency
points
(frequency data)
Number of real time
points
(time data)
Number of frequency
points
(frequency data)
Number of complex time
points
(real/imaginary pairs)
(time data)
100 101 256 101 128
200 201 512 201 256
400 401 1024 401 512
800 801 2048 801 1024
Correlation Instrument Mode
(no complex data)
Resolution
Auto- and cross correlation
(real data)
Time domain
(real data)
0 to T/2
-T/2 to T/2 -T/4 to T/4
100 128 256 128 256
200 256 512 256 512
400 512 1024 512 1024
800 1024 2048 1024 2048
CALCulate
6-21
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