Measurement-computing PCI-DAS6013 Manual do Utilizador descarregar pdf (Página 24)

PCI-DAS6013 and PCI-DAS6014 User's Guide Functional Details

=23 ns minimum

=50 ns minimum

Figure 15. A/D EXTERNAL TIMEBASE signal timing

A/D STOP signal

The A/D STOP signal indicates a completed acquisition sequence. You can program this signal to be available

at any of the AUXOUT pins. The A/D STOP output signal is a 50 ns wide pulse whose leading edge indicates a

DAQ done condition.

= 50 ns

Figure 16. A/D STOP signal timing

Waveform generation timing signals (PCI-DAS6014 only)

The signals that control the timing for the analog output functions on the PCI-DAS6014 are:

 D/A START TRIGGER

 D/A UPDATE

 D/A EXTERNAL TIME BASE

D/A START TRIGGER signal

The D/A START TRIGGER signal is used to hold off output scans until after a trigger event. Any AUXIN pin

can be programmed to serve as the D/A START TRIGGER signal. It is also available as an output on any

AUXOUT pin.

When used as an input, the D/A START TRIGGER signal may be software selected as either a positive or

negative edge trigger. The selected edge of the D/A START TRIGGER signal causes the DACs to start

generating the output waveform.

The D/A START TRIGGER signal can be used as an output to monitor the trigger that initiates waveform

generation. The output is an active-high pulse having a width of 50 ns.

Figure 17 and Figure 18 show the input and output timing requirements for the D/A START TRIGGER signal.

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