Agilent Technologies 8935 Series Manual do Utilizador descarregar pdf (Página 60)

60 Chapter 2

O:\Manuals\E6380A_Progguid\Book\Measrslt.fm

Methods For Reading Measurement Results

RMB ‘MAV’ Example Program

Comments for Recommended Routine

Table 2-2 Comments for Measure Function from MAV

Example Program

Program

Line

Number

Comments

50 Send a Selected Device Clear (SDC) to the Test Set to put the

HP-IB subsystem into a known state. This allows the control

program to regain programmatic control of the Test Set if it is

in an error state when the program begins to run.

60 Command the Test Set to abort the currently executing

measurement cycle. This will force the Test Set to stop waiting

for any measurement results to be available from

measurements which may be in an invalid state when the

program begins to run.

290 Turn event initiated branches off (except ON END, ON

ERROR and ON TIMEOUT) to ensure that the Measure

function will not be exited until it is finished.

300 Set up a 5 second time-out for any I/O activity on the HP-IB.

This will allow the function to recover if the bus hangs for any

reason. The length of the time-out will be implementation

dependent.

310 Set the triggering mode to single followed by a trigger

immediate command. This ensures that a new measurement

cycle will be started when the TRIG:IMM command is sent.

This sequence, that is: set to single trigger and then send

trigger command, guarantees that the measurement result

returned to the ENTER statement will accurately reflect the

state of the DUT when the TRIG:IMM command was sent. The

’IMM’ keyword is optional.

320 Send the query command passed to the Measure function to

the Test Set.

330 Establish a start time against which to compare the

measurement result time-out value passed to the Measure

function.

340 Start the status byte polling loop.

350 Allow the Test Set some time (100 milliseconds) to process the

measurement. When polling the Test Set the polling loop must

give the Test Set time to process the requested measurement.

Since HP-IB command processing has a higher system priority

within the Test Set than measurement functions, constantly

sending HP-IB commands will result in longer measurement

times.

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 328 329

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