Keithley 6482 - Acquire Statistic; Display Subsystem; Control Display

6482-901-01 Rev. A / August 2012 Return to Section Topics 16-25
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual Section 16: SCPI Command Reference
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 elements that
are stored in the buffer.
Notes:
1. If there is no data in the buffer, error -230, “Data corrupt or stale,” will be gener-
ated.
2. If there are a lot of readings stored in the buffer, some statistic operations 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 6482 to talk. See
Section 13.
3. See Appendix B for a detailed explanation on how data flows through the vari-
ous operation blocks of the Model 6482. It clarifies the types of readings that
are acquired by the various commands to read data.
DISPlay subsystem
The display subsystem controls the display of the Model 6482 and is summarized in Table 16-2.
Control display
DIGits <n>
:DISPlay:DIGits <n> Set display resolution
Parameters <n> = 4 3.5 digit resolution
5 4.5 digit resolution
6 5.5 digit resolution
7 6.5 digit resolution
DEFault 5.5 digit resolution
MINimum 3.5 digit resolution
MAXimum 6.5 digit resolution
Query :DIGits? Query display resolution
:DIGits? DEFault Query *RST default resolution
:DIGits? MINimum Query lowest allowable display resolution
:DIGits? MAXimum Query largest allowable display resolution
Description This command is used to set the display resolution. Note that you can instead use
rational numbers. For example, to select 4.5 digit resolution, you can send a
parameter value of 4.5 (instead of 5). The Model 6482 rounds the rational number
to an integer.