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Model 2651A High Power System SourceMeter® Instrument Reference Manual
For information about .condition, .enable, .event, .ntr, and .ptr registers, refer to
2) and
Enable and transition registers
meanings:
Bit
Value
B0-B7
Not used
B8
status.questionable.instrument.smuX.CALIBRATION
status.questionable.instrument.smuX.CAL
B9
status.questionable.instrument.smuX.UNSTABLE_OUTPUT
status.questionable.instrument.smuX.UO
B10-B11
Not used
B12
status.questionable.instrument.smuX.OVER_TEMPERATURE
status.questionable.instrument.smuX.OTEMP
B13-B15
Not used
As an example, to set bit B8 of the questionable status SMU A summary enable register, set
status.questionable.instrument.smua.enable =
status.questionable.instrument.smua.CAL.
In addition to the above constants, questionableRegister can be set to the numeric equivalent of the bit to
set. To set more than one bit of the register, set questionableRegister to the sum of their decimal weights.
For example, to set bits B8 and B9, set questionableRegister to 768 (which is the sum of 256 + 512).
Bit
Binary value
Decimal
Weights
Bit
Binary value
Decimal
Weights
Example
questionableRegister =
status.questionable.instrument.smua.CAL +
status.questionable.instrument.smua.UO
status.questionable.instrument.smua.enable =
questionableRegister
Also see
Questionable Status Registers
status.operation.*
2651A-901-01 Rev. A / March 2011
(on page E-18). The individual bits of this register have the following
B7
B6
0/1
0/1
128
64
7
6
(2
)
(2
)
B15
B14
0/1
0/1
32,768
16,384
15
14
(2
)
(2
)
(on page E-21)
(on page 7-266)
B5
B4
B3
0/1
0/1
0/1
32
16
8
5
4
3
(2
)
(2
)
(2
)
B13
B12
B11
0/1
0/1
0/1
8,192
4,096
2,048
13
12
11
(2
)
(2
)
(2
)
Section 7: Command reference
Status register sets
(on page E-
Description
Not applicable.
Set bit indicates that the
calibration constants stored
in nonvolatile memory were
corrupted and could not be
loaded when the
instrument powered up.
Bit B8 decimal value: 256
Set bit indicates that an
unstable output condition
was detected.
Bit B9 decimal value: 512
Not applicable
Set bit indicates that an
over temperature condition
was detected.
Bit B12 decimal value:
4096
Not applicable.
B2
B1
B0
0/1
0/1
0/1
4
2
1
2
1
0
(2
)
(2
)
(2
)
B10
B9
B8
0/1
0/1
0/1
1024
512
256
10
9
8
(2
)
(2
)
(2
)
Sets bit B8 and bit B9 of the
questionable status SMU A
summary enable register
using constants.
7-305
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