Models 2500 and 2502 User’s Manual SCPI Command Reference 17-39
CALCulate8 Provides statistical data on buffer readings
Select statistic
FORMat <name>
:CALCulate8:FORMat <name> Specify channel 1 buffer format
Parameters <name> = MEAN Mean value of readings in buffer
SDEViation Standard deviation of readings in buffer
MAXimum Largest reading in buffer
MINimum Lowest reading in buffer
PKPK MAXimum - MINimum
Query :FORMat? Query programmed buffer math format
Description This command is used to select the desired statistic on readings stored in
the channel 1 buffer. See Section 8 for details on these statistics.
NOTE Buffer statistics are performed on the presently selected display function (MSR1,
MSR2, RATIO, or DELTA) selected with the :DISPlay:MODE command. Buffer
statistics cannot be performed in the dual-channel display mode.
Acquire statistic
DATA?
:CALCulate8:DATA? Read channel 1 buffer statistic result
Description This query command is used to perform the selected statistic operation
and read the result(s). The result(s) is always returned in ASCII format.
Statistic operations are not performed on TIME and STATus data ele-
ments that are stored in the buffer.
Notes:
1. If there is no data in the buffer, error -230, “Data corrupt or stale,”
will be generated.
2. If there are a lot of readings stored in the buffer, some statistic oper-
ations may take too long and cause a bus time-out error. To avoid
this situation, send the :calc8:data? command and then wait for the
MAV (message available) bit in the status byte register to set before
addressing the Model 2500 to talk. See Section 14.
3. See Appendix C for a detailed explanation on how data flows
through the various operation blocks of the Model 2500. It clarifies
the types of readings that are acquired by the various commands to
read data.
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