Keithley 6482 Reference Manual page 223

Section 16: SCPI Command Reference
Description
NOTE
NOTE
16-30
This command is used to specify the elements to be included in the data string in
response to the following queries:
:FETCh?
:READ?
:MEASure?
:TRACe:DATA?
You can specify from one to all four elements. Each element in the list must be
separated by a comma (,). These elements (shown in
as follows:
An overflow reading reads as +9.9E37.
CURRent[1]: This element provides the channel 1 current reading. If no reading is
available, the NAN (not a number) value of +9.91e37 is used.
CURRent2: This element provides the channel 2 current reading. If no current
reading is available, the NAN (not a number) value of +9.91e37 is used.
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 (:SYS-
Tem:TIME:RESet). The timestamp for each reading sent over the bus is refer-
enced, in seconds, to the start time. After 99,999.999 seconds, the timer resets to
zero and starts over.
Timestamp is also available for buffer readings. Timestamp can be referenced to
the first reading stored in the buffer (absolute format) which is timestamped at 0
seconds, or can provide the time between each reading (delta format). The
:TRACe:TSTamp:FORMat command is used to select the absolute or delta for-
mat.
Timestamp values are approximate. See
STATus: A status word is available to provide status information concerning
Model 6482 operation. The 24-bit status word is sent in a decimal 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 65, the binary equivalent is
0000000000001000001. Bits 0 and 6 are set.
The significance of each status bit is explained as follows:
Bit 0 (OFLO1): Set to 1 if channel 1 measurement was made while in over-range.
Cleared to 0 otherwise.
Bit 1 (OFLO2): Set to 1 if channel 2 measurement was made while in over-range.
Cleared to 0 otherwise.
Bit 2 (FILTERED): Set to 1 if either channel 1 or channel 2 measurement was
made with the filter enabled. Cleared to 0 otherwise
Bit 3 (COMPLIANCE1): Set to 1 if the channel 1 voltage source is in compliance.
Cleared to 0 otherwise.
Bit 4 (COMPLIANCE2): Set to 1 if the channel 2 voltage source is in compliance.
Cleared to 0 otherwise.
Bit 5 (NULL1_ACTIVE): Set to 1 if channel 1 REL (CALC3) is enabled. Cleared to
0 otherwise.
Bit 6 (NULL2_ACTIVE): Set to 1 if channel 2 REL (CALC4) is enabled. Cleared to
0 otherwise.
Bit 7 (LIMITS_ACTIVE): Set to 1 if a limit test (CALC7) is enabled. Cleared to 0
otherwise.
Return to
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Section 6
Section Topics
Figure 16-1) are explained
for details.
6482-901-01 Rev. A / August 2012