Specifications

70 Chapter 5
Starting Measurement Cycle (Triggering) and Detecting End of Measurement
Waiting for (Detecting) End of Measurement
Waiting for (Detecting) End of Measurement
The status of the 4287A can be detected through the status registers. This section describes
how to detect the end of measurement by using the status registers. For a complete
description of the status report mechanism, including the specifications of each bit, see
Appendix B, “Status Reporting System.”
End of measurement is reported by the operation status condition register. An SRQ (service
request) is useful when you create a program that uses the information reported by this
register to detect the end of measurement.
To detect the end of measurement via an SRQ, use one of the following commands:
• *SRE on page 207
• :STAT:OPER:ENAB on page 299
• :STAT:OPER:PTR on page 300
• :STAT:OPER:NTR on page 300
Follow these steps:
Step 1. Configure the 4287A to generate an SRQ when the bit 4 value of the operation status
condition register is changed form 1 to 0.
Step 2. Trigger the instrument to start a measurement cycle.
Step 3. When an SRQ is generated, the program interrupts the measurement cycle.
Figure 5-3 SRQ generation sequence (at end of list measurement)