Keithley 2651A, Reference Manual

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Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference
2651A-901-01 Rev. A / March 2011 7-259
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-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).
Bit B7 B6 B5 B4 B3 B2 B1 B0
Binary value 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Decimal 128 64 32 16 8 4 2 1
Weights (2
7
) (2
6
) (2
5
) (2
4
) (2
3
) (2
2
) (2
1
) (2
0
)
Bit B15 B14 B13 B12 B11 B10 B9 B8
Binary value 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Decimal 32,768 16,384 8,192 4,096 2,048 1024 512 256
Weights (2
15
) (2
14
) (2
13
) (2
12
) (2
11
) (2
10
) (2
9
) (2
8
)
Example
status.measurement.instrument.smua.enable =
status.measurement.instrument.smua.VLMT
Sets the VLMT bit of the
measurement event SMU A
summary enable register
using a constant.
Also see
Measurement Event Registers (on page E-23)