User manual

18-50 SCPI Command Reference 2400 Series SourceMeter
®
User’s Manual
sourced or measured, the NAN (not a number) value of +9.91e37 is
used.
CURRent — This element provides the current measurement or the
programmed current source reading. If sourcing current and measur
-
ing current, this element will provide the current measurement (mea-
sure reading takes priority over source reading). If current is not
sourced or measured, the NAN (not a number) value of +9.91e37 is
used.
RESistance — This element provides the resistance measurement.
If resistance is not measured, the NAN (not a number) value of
+9.91e37 is used.
TIME — A timestamp is available to reference each group of read-
ings 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 times
-
tamp 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.
NOTE Timestamp values are approximate. See Section 9 for details.
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 com
-
mand is used to select the absolute or delta format.
STATus — A status word is available to provide status information
concerning SourceMeter operation. The 24-bit status word is sent in
a decimal form and has to be converted by the user to the binary
equivalent to determine the state of each bit in the word. For exam
-
ple, 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 (OFLO) — Set to 1 if measurement was made while in over-range.
Bit 1 (Filter) — Set to 1 if measurement was made with the filter enabled.
Bit 2 (Front/Rear) — Set to 1 if FRONT terminals are selected.
Bit 3 (Compliance) — Set to 1 if in real compliance.
Bit 4 (OVP) — Set to 1 if the over voltage protection limit was reached.
Bit 5 (Math) — Set to 1 if math expression (calc1) is enabled.
Bit 6 (Null) — Set to 1 if Null is enabled.
Bit 7 (Limits) — Set to 1 if a limit test (calc2) is enabled.
Bits 8 and 9 (Limit Results) — Provides limit test results (see grading
and sorting modes below).
Bit 10 (Auto-ohms) — Set to 1 if auto-ohms enabled.
Bit 11 (V-Meas) — Set to 1 if V-Measure is enabled.
Bit 12 (I-Meas) — Set to 1 if I-Measure is enabled.
Bit 13 (Ω-Meas) — Set to 1 if Ω-Measure is enabled.
Bit 14 (V-Sour) — Set to 1 if V-Source used.
Bit 15 (I-Sour) — Set to 1 if I-Source used.
Bit 16 (Range Compliance) — Set to 1 if in range compliance.