Keithley 6430, Instruction Manual

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SCPI Command Reference 17-47
VOLTage
— This element provides the voltage measurement or the pro-
grammed voltage source reading. If sourcing voltage and measuring volt-
age, this element will provide the voltage measurement (measure reading
takes priority over source reading). If voltage is not sourced or measured,
the NAN (not a number) value of +9.91e37 is used.
CURRent — This element provides the current measurement or the pro-
grammed current source reading. If sourcing current and measuring current,
this element will provide the current measurement (measure 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 resis-
tance is not measured, 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 (: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 back to zero and starts over.
Timestamp is also available for buffer readings. Timestamp can be refer-
enced to the
fi rst 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 format.
NOTE
Timestamp values are approximate. See Section 8 for details.
STATus
— A status word is available to provide status information con-
cerning 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 deter-
mine 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 signi
fi cance 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 fi lter enabled.
Bit 2 — Not used.
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 in the following paragraph,
Limit test bits
.
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.