Adlink DAQe-2006 Bedienungsanleitung PDF herunterladen (Seite 60)

48 Operation Theory

The D/A conversion is initiated by a trigger source. You must

decide how to trigger the D/A conversion. The data output will start

when a trigger condition is met. Before the start of D/A conversion,

D/A data is transferred from the computer’s main memory to a

buffering Data FIFO.

There are two modes of the D/A conversion: Software Update and

Timed Waveform Generation. These are described below, includ-

ing the timing, trigger source control, trigger modes, and data

transfer methods. Either mode may be applied to D/A channels

independently. You can software update DA CH0 while generating

timed waveforms on CH1 at the same time.

Software Update

This is the easiest way to generate D/A output. To do this:

1. Specify the D/A output channels.

2. Set output polarity (unipolar or bipolar) and reference

source (internal 10V or external AOEXTREF).

3. Update the digital values into D/A data registers through

a software output command.

Digital Code Analog Output

111111111111 Vref * (4095/4096)

100000000000 Vref * (2048/4096)

000000000001 Vref * (1/4096)

000000000000 0V

Table 4-6: Unipolar Output Code Table

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 91 92

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Adlink DAQe-2006 Bedienungsanleitung Seite 60