Section 7: TSP command reference
Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-256
2657A-901-01 Rev. B/December 2012
Details
These attributes are used to read or write to the measurement event SMU X summary registers. Reading a
status register returns a value. The binary equivalent of the returned value indicates which register bits are set.
The least significant bit of the binary number is bit B0, and the most significant bit is bit B15. For example,
assume the value 257 is returned for the enable register. The binary equivalent is 0000 0001 0000 0001. This
value indicates that bit B0 (VLMT) and bit B8 (BAV) are set.
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
** > > > > > > > > > > > > > > *
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
* Least significant bit
** Most significant bit
For information about .condition, .enable, .event, .ntr, and .ptr registers, refer to
(on
Enable and transition registers
(on page E-19). The individual bits of this register are defined in
the following table.
Bit Value
Description
B0*
status.measurement.instrument.smu
X
.VOLTAGE_LIMIT
status.measurement.instrument.smu
X
.VLMT
Set bit indicates that the
voltage limit was
exceeded.
Bit B0 decimal value: 1
B1*
status.measurement.instrument.smu
X
.CURRENT_LIMIT
status.measurement.instrument.smu
X
.ILMT
Set bit indicates that the
current limit was exceeded.
Bit B1 decimal value: 2
B2*
status.measurement.instrument.smu
X
.SINK_LIMIT
status.measurement.instrument.smu
X
.SLMT
Set bit indicates that a sink
compliance condition has
occurred.
Bit B2 decimal value: 4
B3*
status.measurement.instrument.smu
X
.OVERVOLTAGE
status.measurement.instrument.smu
X
.OV
Set bit indicates that an
overvoltage condition has
occurred.
Bit B3 decimal value: 8
B4-B6 Not
used
Not applicable.
B7
status.measurement.instrument.smu
X
.READING_OVERFLOW
status.measurement.instrument.smu
X
.ROF
Set bit indicates that an
overflow reading has been
detected.
Bit B7 decimal value: 128
B8
status.measurement.instrument.smu
X
.BUFFER_AVAILABLE
status.measurement.instrument.smu
X
.BAV
Set bit indicates that there
is at least one reading
stored in either or both of
the dedicated reading
buffers.
Bit B8 decimal value: 256
B9-B15 Not
used
Not applicable.
* This bit will be updated only when a measurement is taken or
smu
X
.source.compliance
is invoked.
As an example, to set bit B0 of the measurement event SMU X summary enable register, set
status.measurement.instrument.smua.enable
= status.measurement.instrument.smua.VLMT
.
In addition to the above constants,
measurementRegister
can be set to the decimal equivalent of the bit to
set. To set more than one bit of the register, set
measurementRegister
to the sum of their decimal weights.
For example, to set bits B1 and B8, set
measurementRegister
to 258 (which is the sum of 2 + 256).
Содержание 2657A
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