Connect-Tek USB-2 Especificações descarregar pdf (Página 402)

100

101

Status and Events

For example, a t

ypical application m ight involve acquiring a single-sequence

waveform and then taking a measurement on the acquired w aveform. You c ould

use the following command sequence to do this:

/* Set up conditional acqui sition */

ACQUIRE:STATE OFF

SELECT:CH1 ON

ACQUIRE:MODE SAMPLE

ACQUIRE:STOPAFTER SEQUENCE

/* Acquir e waveform data */

ACQUIRE:STATE ON

/* Set up the measurement parameters */

MEASUREMENT:IMMED:TYPE AMPLITUDE

MEASUREMENT:IMMED:SOURCE CH

/* Take amplitude measurement */

MEASUREMENT:IMMED:VALUE

The acquisition of the waveform requires extended processing time. It may not

ﬁnish before the oscilloscope takes an amplitude measurement (see the following

ﬁgure). This can result in an incorrect amplitude value.

Figure 3-7: Command Processing Without Using Synchronization

To ensure the oscilloscope completes waveform acquisition before taking the

measurement on the acquired data, you can synchronize the program.

Figure 3-8: Processing Sequence With Synchronization

You can use four different methods to synchronize the operation of the

oscilloscope with your application program: *WAI, BUSY, *OPC, and *OPC?.

The *OPC? query method is the most simp

le approach.

Using the *WAI Command

The *WAI command forces completion of previous commands that generate

an OPC message. No commands after the *WAI are processed before the OPC

message(s) are generated.

3-8 MSO2000B, DPO2000B, MSO2000 and DPO2000 Series Oscilloscopes Programmer Manual

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