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2600AS-901-01 Rev. B / September 2008 Return to Section Topics C-21

Series 2600A System SourceMeter® Instruments Reference Manual Appendix C: Status Model

Measurement Event Registers

As shown in Figure C-8, there are eight register sets associated with Measurement Event Status.

Commands are summarized in the Status register sets. Keep in mind that bits can also be set by

using numeric parameter values. For details, see Programming enable and transition registers.

For example, either of the following commands will set the VOLTAGE_LIMIT enable bit:

status.measurement.enable = status.measurement.VOLTAGE_LIMIT

status.measurement.enable = 1

When reading a register, a numeric value is returned. The binary equivalent of this value indicates

which bits in the register are set. For details, see

Reading registers. For example, the following

command will read the measurement enable register:

print(status.measurement.enable)

This register set feeds to bit B0 (MSB) of the Status Byte. The bits used in the Measurement Event

Registers are described as follows:

• Bit B0, Voltage Limit (VLMT): Set bit indicates that the voltage limit was exceeded. This bit

will be updated only when (1) a measurement is taken or (2) the

smuX.source.compliance command is invoked.

• Bit B1, Current Limit (ILMT): Set bit indicates that the current limit was exceeded. This bit

will be updated only when (1) a measurement is taken or (2) the

smuX.source.compliance command is invoked.

• Bit B7, Reading Overflow (ROF): Set bit indicates that an overflow reading has been

detected.

• Bit B8, Buffer Available (BAV): Set bit indicates that there is at least one reading stored in

either or both of the nonvolatile reading buffers.

• Bit B11, Output Enable (OE): Set bit indicates that output enable has been asserted.

• Bit B13, Instrument Summary (INST): Set bit indicates that a bit in the measurement

instrument summary register is set.

For more information on the Measurement Event Registers, refer to Status register sets and the

charts in this appendix.

Keithley 2600a series User Manual

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