Appendix E: Status model
Model 2657A High Power System SourceMeter® Instrument Reference Manual
E-24
2657A-901-01 Rev. B/December 2012
Measurement Event Registers
As shown in the status model's
(on page E-8), there are eight register
sets associated with measurement event status. Commands are summarized in the
(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
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
(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 B2, Sink Limit (SLMT):
Set bit indicates that the sink 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 B3, Overvoltage (OV):
Set bit indicates that an overvoltage condition has occurred. 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, Interlock (INT):
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
(on
page E-4) table. For more information about the Measurement Event Registers, refer to
(on page E-1) and the figures in this appendix.
Summary of Contents for 2657A
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