D-28 Status Model Series 2600 System SourceMeters Reference Manual
2600S-901-01 Rev. A / May 2006 Return to Appendix D topics
Measurement Event Registers
As shown in Figure D-5, there are seven register sets associated with Measure-
ment Event Status. Commands are summarized in Table D-9. Keep in mind that
bits can also be set by using numeric parameter values. For details, see “Pro-
gramming enable and transition registers” in this appendix.
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 regis-
ters” in this appendix. For example, the following command will read the
measurement enable register:
print(status.measurement.enable)
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 non-volatile 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.
Measurement Event Current Limit Summary
This summary register set feeds to ILMT bit B1 of the Measurement Event
Register. Used summary bits for this register include B1 (SMUA) and B2 (SMUB).
A set bit indicates that a SMU (A or B) is in current limit (compliance).
Measurement Event Voltage Limit Summary
This summary register set feeds to VLMT bit B0 of the Measurement Event
Register. Used summary bits for this register include B1 (SMUA) and B2 (SMUB).
A set bit indicates that a SMU (A or B) is in voltage limit (compliance).
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