Adlink DAQe-2502 Bedienungsanleitung PDF herunterladen (Seite 44)

34 Operation Theory

Using DACs’ Multiplying Characteristic

The D/A reference selection let you fully utilize the multiplying

characteristics of the DACs. Digital codes sent to the D/A convert-

ers are multiplied by the reference to generate output.

The DAQ-/DAQe-/PXI-2502/2501 card can generate standard and

arbitrary functions, continuously or piece-wisely. The Appendix

illustrates all possible waveform patterns generated by the DAQ-/

DAQe-/PXI-2502/2501 card in combination with various counters,

clock sources, and voltage references.

Software Update

This method is suitable for applications that need to generate D/A

output controlled by user programs. In this mode, the D/A con-

verter generates one output once the software command is

issued. However, it is difficult to determine the software update

rate under a multi-task OS like Windows.

Magnitude

Bipolar Unipolar

Output Output Digital Code

FSR – LSB +Vref * (2046 / 2048) Vref * (4095 / 4096) 0FFF

Midscale + LSB +Vref * (1 / 2048) Vref * (2049 4096) 0801

Midscale 0 Vref * (2048 / 4096) 0800

Midscale – LSB -Vref * ( 1 / 2048) Vref * (2047 / 4096) 07FF

-FSR + LSB -Vref * (2046 / 2048) Vref * ( 1 / 4096) 0001

-FSR -Vref 0 0000

Table 4-5: D/A Output Versus Digital Codes

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 73 74

Keine Kommentare

Adlink DAQe-2502 Bedienungsanleitung Seite 44