Keithley SourceMeter 2600B Series, Reference Manual

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Appendix E: Status model Series 2600B System SourceMeter® Instrument Reference Manual
E-24 2600BS-901-01 Rev. C / August 2016
Measurement Event Registers
As shown in the status model's Measurement event registers (on page E-8), there are eight register
sets associated with measurement event status. Commands are summarized in the Status register
set contents (on page E-1) topic. Note that bits can also be set by using numeric parameter values.
For details, see Programming enable and transition registers (on page E-14) .
For example, either of the following commands will set the VOLTAGE_LIMIT enable bit:
status.measurement.enable = status.measurement.VOLTAGE_LIMIT
status.measurement.enable = 1
When reading a register, a numeric value is returned. The binary equivalent of this value indicates
which bits in the register are set. For details, see Reading registers (on page E-15). For example, the
following command will read the Measurement Event Enable Register:
print(status.measurement.enable)
This register set feeds to bit B0 (MSB) of the Status Byte. The bits used in the Measurement Event
Registers are described as follows:
•
Bit B0, Voltage Limit (VLMT):
Set bit indicates that the voltage limit was exceeded. This bit will
be updated only when either a measurement is taken or the smu X .source.compliance
attribute is read.
•
Bit B1, Current Limit (ILMT):
Set bit indicates that the current limit was exceeded. This bit will
be updated only when either a measurement is taken or the smu
X
.source.compliance
attribute is read.
•
Bit B7, Reading Overflow (ROF): Set bit indicates that an overflow reading has been detected.
•
Bit B8, Buffer Available (BAV): Set bit indicates that there is at least one reading stored in
either or both of the nonvolatile reading buffers.
•
Bit B11, Output Enable (OE):
(Models 2601B/2602B/2604B) Set bit indicates that output enable
was asserted.
Bit B11, Interlock (INT): (Models 2611B/2612B/2614B/2634B/2635B/2636B) Set bit indicates
that interlock was asserted.
•
Bit B13, Instrument Summary (INST):
Set bit indicates that a bit in the Measurement Instrument
Summary Register is set.
Commands to program and read the register are summarized in the Status function summary (on
page E-4) table. For more information about the Measurement Event Registers, refer to Status
register set contents (on page E-1) and the figures in this appendix.