Keithley 2635 Reference Manual

2600S-901-01 Rev. C / January 2008 Return to Section Topics 12-83
Series 2600 System SourceMeter® Instruments Reference Manual Section 12: Instrument Control Library
status.measurement.instrument.smuX.*
status.measurement.instrument.smuX.condition
status.measurement.instrument.smuX.enable
status.measurement.instrument.smuX.event
status.measurement.instrument.smuX.ntr
status.measurement.instrument.smuX.ptr
* = condition, enable, event, ntr or ptr
smuX = smua or smub
Attribute Measurement SMU event status register set.
Usage Reads condition, enable, event, NTR and PTR registers:
measreg = status.measurement.instrument.smuX.condition
measreg = status.measurement.instrument.smuX.enable
measreg = status.measurement.instrument.smuX.event
measreg = status.measurement.instrument.smuX.ntr
measreg = status.measurement.instrument.smuX.ptr
Writes to enable, NTR and PTR registers:
status.measurement.instrument.smuX.enable = measreg
status.measurement.instrument.smuX.ntr = measreg
status.measurement.instrument.smuX.ptr = measreg
Set measreg to one of the following values:
0 Clears all bits.
status.measurement.VOLTAGE_LIMIT Sets VLMT bit (B0).
status.measurement.VLMT Sets VLMT bit (B0).
status.measurement.CURRENT_LIMIT Sets ILMT bit (B1).
status.measurement.ILMT Sets ILMT bit (B1).
status.measurement.READING_OVERFLOW Sets ROF (B7).
status.measurement.ROF Sets ROF (B7).
status.measurement.BUFFER_AVAILABLE Sets BAV (B8).
status.measurement.BAV Sets BAV (B8).
measreg can also be set to the decimal weight of the bit to be set. Examples:
To set bit B0 (VLMT), set measreg to 1 (2
0
).
To set bit B1 (ILMT), set measreg to 2 (2
1
).
To set bit B8 (BAV), set measreg to 256 (2
8
).
To set more than one bit of the register, set measreg to the sum of their decimal weights.
For example, to set bits B0 and B8, set measreg to 257 (1 + 256).
Remarks • This attribute is used to read or write to the measurement SMU event 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 0,
and the most significant bit is bit 15.
• For example, assume value 257 is returned for the enable register. The binary equivalent
is 0000000100000001. This value indicates that bit B0 (VLMT) and bit B8 (BAV) are set.
• The used bits of the measurement SMU event registers are described as follows:
• Bit B0, VLMT – Set bit indicates that the voltage limit was exceeded. This bit will be
updated only when a measurement is taken or
smuX.source.compliance is
invoked.
• Bit B1, ILMT – Set bit indicates that the current limit was exceeded. This bit will be
updated only when a measurement is taken or
smuX.source.compliance is
invoked.
• Bit B7, ROF – Set bit indicates that an overflow reading has been detected.
• Bit B8, BAV – Set bit indicates that there is at least one reading stored in either or
both of the non-volatile reading buffers.
Details See “Measurement Event Registers” in Appendix D.
Example Sets the BAV bit of the measurement SMU A enable register:
status.measurement.instrument.smuX.enable = status.measurement.BAV

Keithley 2635 Specifications

General

Brand	Keithley
Model	2635
Category	Measuring Instruments
Language	English