Filter
Top Products
67
Chapter 2, Methods For Reading Measurement Results
HP
®
BASIC ‘MAV’ Example Program
360
Perform a serial poll to read the Status Byte from the Test Set. A serial poll is
used because the *STB Common Command cannot be processed by the Test Set
while a query is pending. Sending the *STB command will cause an
’HP-IB Error: -410 Query INTERRUPTED’ error.
370
Check bit 4, the Message Available bit (MAV), to see if it is set to ’1’. If it is, then
the requested measurement result is ready.
380
Read the measurement result.
390
Set the trigger mode to repetitive retriggering. Setting the trigger mode to
repetitive will be implementation dependent.
400
Re-enable event initiated branching. If any event initiated branches were logged
while the Measure function was executing they will be executed when system
priority permits.
410
Exit the Measure function and return the result value.
430
Check to see if the measurement result time out value has been equaled or
exceeded. If it has the polling loop will be exited.
440
The following lines of code handle the case where the request for a measurement
result has timed out because the polling loop has completed with no result
available.
450
Set up a timeout for any I/O activity on the GPIB while the control program is
trying to regain control of the Test Set. This will allow the function to gracefully
stop program execution if the control program cannot regain control of the Test
Set. This timeout should only occur if there is some type of hardware failure,
either in the Test Set or the external controller, which prevents them from
communicating via GPIB.
460
Send a Selected Device Clear (SDC) to the Test Set to put the GPIB subsystem
into a known state. This allows the control program to regain programmatic
control of the Test Set.
470
Command the Test Set to abort the currently executing measurement cycle. Set
the trigger mode back to repetitive retriggering. Setting the Test Set back to
repetitive retriggering will be implementation dependent.
Table 8 Comments for Measure Function from MAV Example Program (Continued)
Program Line
Number
Comments