Keithley 6487, Справочное руководство

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Model 6487 Reference Manual Buffer and Sweeps 6-7
F) :FORMat:ELEMents <list>
List parameters:
• READing — Includes the buffer reading in each data string.
• UNITs — Identifies amps, ohms, or math units.
• VSOurce — Includes voltage source value in each reading string.
• TIME — Includes the timestamp for each reading. Timestamp can be in the abso-
lute or delta format (see Ref D).
• STATus — Includes a status word for each reading. It provides status information
on instrument operation. (See
“FORMat subsystem,” page 13-4 .)
• DEFault — All except VSource.
• ALL — Includes all reading elements.
• At least one data element must be in the list. Listed elements must be separated by
a comma (i.e. FORMat:ELEMents, READing, TIME). Elements not listed will not
accompany the response message for TRACe:DATA?. Data in the response mes-
sage will be in order of the listed data elements set by this command.
G) :CALCulate3:FORMat <name>
This command selects the statistic to be returned by CALCulate3:DATA? (see Ref H).
Name parameters:
• MINimum — Select the lowest reading stored in the buffer.
• MAXimum — Select the largest reading stored in the buffer.
• MEAN — Select the mean average statistic for the readings stored in the buffer.
• SDEViation — Select the standard deviation statistic for the readings stored in the
buffer.
• PKPK — Select the peak-to-peak statistic for readings stored in the buffer.
Peak-to-Peak is calculated as follows: PKPK = MAXimum - MINimum.
H) :CALCulate3:DATA?
1. If the number of data points in the buffer is one or none, CALCulate3:DATA? will
result in an error (-230).
2. If there is a lot of data in the buffer, some statistic operations may take too long and
cause a bus time-out error. To avoid this, send CALC3:DATA? and then wait for
the MAV (message available) bit in the Status Byte Register to set before address-
ing the Model 6487 talk (
Section 10 ).