Keithley 2520, User Manual, Page: 212 / 329

Model 2520 User’s Manual SCPI Command Reference 14-23
VOLTage3 — This element provides the detector #2 voltage source
value.
TIME — A timestamp is available to reference each group of readings
to a point in time. The relative timestamp operates as a timer that starts
at zero seconds when the instrument is turned on or when the relative
timestamp is reset (:SYSTem:TIME:RESet). The timestamp for each
reading sent over the bus is referenced, in seconds, to the start time.
After 99,999.999 seconds, the timer resets to zero and starts over. The
timer value updates for each pass through the Trigger Event Detector
(see
Figure 8-6 ). Therefore, all points in a single sweep will have the
same time value.
STATus — A status word is available to provide status information con-
cerning Model 2520 operation. The 16-bit status word is sent in a deci-
mal form and must be converted by the user to the binary equivalent to
determine the state of each bit in the word. For example, if the status
value is 17, the binary equivalent is 0000000000010001. Bits 0 and 4
are set.
The significance of each status bit is explained as follows:
Bit 0 (OFLO1) — Set to 1 if the laser diode voltage measurement was
made while in over-flow. Cleared to 0 otherwise.
Bit 1 (OFLO2) — Set to 1 if the detector #1 current measurement was
made while in over-flow. Cleared to 0 otherwise.
Bit 2 (OFLO3) — Set to 1 if the detector #2 current measurement was
made while in over-flow. Cleared to 0 otherwise.
Bit 3 (COMPL) — Set to 1 if the laser diode current source is in voltage
compliance (limit). Cleared to 0 otherwise.
Bit 4 (FILT) — Set to 1 if any measurement was made with the averag-
ing filter on. Cleared to 0 otherwise.
Calculate data elements
CALCulate <item list>
:FORMat:ELEMents:CALCulate <item list> Specify CALC data string elements
Parameters
<item list> = CALCulate Includes CALC data element
TIME Includes timestamp
STATus Includes status information
NOTE Each item in the list must be separated by a comma (i.e., CALC, TIME).
Query
:CALCulate? Query elements in CALC data string