DAQ VXI-SC-1102 Manual de Instruções descarregar pdf (Página 46)

National Instruments Corporation 5-1 DAQ Hardware Overview Guide

AT-AO-6/10 Analog

Output Devices

This chapter contains overview information on the AT-AO-6/10 analog

output devices, including the AT-AO-6 and the AT-AO-10.

AT-AO-6/10 Analog Output

The AT-AO-6 and AT-AO-10 contain six or 10 analog output channels,

respectively. Each analog output channel contains a 12-bit DAC. The

DACs are double buffered, which facilitates accurate waveform generation

via the delayed update mode. You can hardware jumper configure each

analog output channel for unipolar or bipolar voltage output. An onboard

voltage of +10 V or an externally connected voltage signal is available for

analog output channel pairs as a voltage reference. There is a 4 to 20 mA

current output associated with each analog output channel. You control the

current output by writing voltages to the DACs with the NI-DAQ function

AO_Write or AO_VWrite or the LabVIEW AO_Single_Update.vi.

See the AT-AO-6/10 User Manual for the voltage/current relationship.

AT-AO-6/10 Waveform Generation

The waveform generation functions (WFM) can write values continuously to

any number of analog output channels using an onboard or external clock

to update the DACs at regular intervals. You can assign output channels to

one of two groups. Each group has its own dedicated update clock. The

values written to the DACs are contained in a buffer that you allocate and

fill. The resultant voltages produced at the analog output channels depend

on the value of the integer numbers in the buffer, the level of the reference

voltage, and the polarity setting.

Waveform Generation Using Onboard Memory

The AT-AO-6/10 supports FIFO mode waveform generation. In this mode,

the device transfers the values for one cycle of waveform to onboard DAC

FIFO memory only once. Then the device cycles through these values to

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DAQ VXI-SC-1102 Manual de Instruções Página 46