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3–8
TLS 216 Programmer Manual
To ensure the logic scope completes waveform acquisition before taking the
measurement on the acquired data, you can synchronize the program. Figure 3–8
shows the desired processing sequence.
MEASUREMENT:IMMED:VALUE?
Processing Time
Acquiring Waveform Data
ACQUIRE:STATE ON
Figure 3–8: Processing Sequence With Synchronization
You can use four commands to synchronize the operation of the logic scope with
your application program: *WAI, BUSY?, *OPC, and *OPC?.
You can force commands to execute sequentially by using the *WAI command.
This command forces completion of the previous commands before processing
new ones.
The same command sequence using the *WAI command for synchronization
looks like this:
/* Set up single-sequence acquisition */
SELECT:GROUP1 ON
GROUP1:FIRST 1
HORIZONTAL:RECORDLENGTH 500
ACQUIRE:MODE NORMAL SAMPLE
ACQUIRE:STOPAFTER SEQUENCE
/* Acquire waveform data */
ACQUIRE:STATE ON
/* Set up the measurement parameters */
MEASUREMENT:IMMED:TYPE AMPLITUDE
MEASUREMENT:IMMED:SOURCE CH1
/* Wait until the acquisition is complete before taking the measurement */
*WAI
/* Take amplitude measurement on acquired data */
MEASUREMENT:IMMED:VALUE?
Though *WAI is one of the easiest way to achieve synchronization, it is also the
most costly. The processing time of the logic scope is slowed since it is
Using the *WAI Command