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Model 2651A High Power System SourceMeter® Instrument Reference Manual
Bit
Value
B0*
status.measurement.instrument.smuX.VOLTAGE_LIMIT
status.measurement.instrument.smuX.VLMT
B1*
status.measurement.instrument.smuX.CURRENT_LIMIT
status.measurement.instrument.smuX.ILMT
B2-B6
Not used
B7
status.measurement.instrument.smuX.READING_OVERFLOW
status.measurement.instrument.smuX.ROF
B8
status.measurement.instrument.smuX.BUFFER_AVAILABLE
status.measurement.instrument.smuX.BAV
B9-B15
Not used
* This bit will be updated only when a measurement is taken or smuX.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
Binary value
Decimal
Weights
Bit
Binary value
Decimal
Weights
Example
status.measurement.instrument.smua.enable =
status.measurement.instrument.smua.VLMT
Also see
Measurement Event Registers
2651A-901-01 Rev. A / March 2011
B7
B6
B5
0/1
0/1
0/1
128
64
32
7
6
5
(2
)
(2
)
(2
)
B15
B14
B13
0/1
0/1
0/1
32,768
16,384
8,192
15
14
13
(2
)
(2
)
(2
)
(on page E-23)
Section 7: Command reference
B4
B3
B2
0/1
0/1
0/1
16
8
4
4
3
2
(2
)
(2
)
(2
)
B12
B11
B10
0/1
0/1
0/1
4,096
2,048
1024
12
11
10
(2
)
(2
)
(2
)
Sets the VLMT bit of the
measurement event SMU A
summary enable register
using a constant.
Description
Set bit indicates that the
voltage limit was
exceeded.
Bit B0 decimal value: 1
Set bit indicates that the
current limit was exceeded.
Bit B1 decimal value: 2
Not applicable.
Set bit indicates that an
overflow reading has been
detected.
Bit B7 decimal value: 128
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
Not applicable.
B1
B0
0/1
0/1
2
1
1
0
(2
)
(2
)
B9
B8
0/1
0/1
512
256
9
8
(2
)
(2
)
7-259
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