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8-4
Buffer
SCPI programming
Commands associated with buffer operation are listed in Table 8-1. The TRACe commands
are used to store and recall readings in the buffer. The FORMat:ELEMents command is used to
specify which data elements to include in the response message for TRACe:DATA? (which is
the command to read the buffer). The CALCulate3 commands are used to obtain statistics from
the buffer data.
NOTE
The Model 6514 uses IEEE-754 floating point format for statistics calculations.
A) TRACe:FREE?
Two values, separated by commas, are returned. The first value indicates how many bytes of
memory are available, and the second value indicates how many bytes are reserved to store
readings.
Table 8-1
SCPI commands — buffer
Commands
Description
Default
Ref
:TRACe
TRACe Subsystem:
See Note
:CLEar
Clear readings from buffer.
:FREE?
Query bytes available and bytes in use.
A
:POINts <n>
Specify number of readings to store; 1 to 2500.
100
:ACTual?
Returns number of readings actually stored in buffer.
:FEED <name>
Select source of readings; SENSe[1], CALCulate[1] or
CALCulate2.
SENS1
B
:CONTrol <name>
Select buffer control mode; NEVer or NEXT.
NEV
C
:TSTamp
Timestamp:
:FORMat <name>
Select timestamp format; ABSolute or DELTa.
ABS
D
:DATA?
Read all readings in buffer.
E
:FORMat
FORMat Subsystem:
Sec
16
:ELEMents <list>
Specify data elements for :TRACe:DATA? response
message; READing, TIME and STATus.
All 3
F
:CALCulate3
CALCulate3 Subsystem:
:FORMat <name>
Select buffer statistic; MINimum, MAXimum, MEAN,
SDEViation or PKPK.
MEAN
G
:DATA?
Read the selected buffer statistic.
H
Note: SYSTem:PRESet and *RST have no effect on :TRACe commands. The listed defaults are power-on defaults.
Summary of Contents for 6514
Page 203: ...14 CommonCommands...
Page 207: ...15 SCPISignalOriented MeasurementCommands...
Page 235: ...18 PerformanceVerification...
Page 254: ...19 Calibration...
Page 274: ...20 RoutineMaintenance...
Page 278: ...A Specifications...
Page 282: ...B StatusandErrorMessages...
Page 288: ...C GeneralMeasurement Considerations...
Page 294: ...D DDCEmulationCommands...
Page 299: ...E ExamplePrograms...
Page 306: ...F IEEE 488BusOverview...
Page 320: ...G IEEE 488andSCPI ConformanceInformation...
Page 324: ...H CalibrationOptions...