Chapter 7

Analog Output

the buffer at a fast enough rate to keep up with the generation, the buffer will underflow and cause an error.

Analog Output Digital Triggering

Analog output supports two different triggering actions:

•Start trigger

•Pause trigger

A digital trigger can initiate these actions on the USB-621xdevices. Refer to the AO Start Trigger Signal and AO Pause Trigger Signal sections for more information about these triggering actions.

Connecting Analog Output Signals

AO <0..1> are the voltage output signals for AO channels 0 and 1.

AO GND is the ground reference for AO <0..1>.

Figure 7-2shows how to make AO connections to the device.

Load

Load

 

 

 

 

Isolation

 

 

 

 

Barrier

 

 

 

 

(USB-6215

 

 

Analog Output Channels

and USB-6218

 

 

devices only)

 

 

 

 

 

+

AO 0

Channel 0

 

 

 

Digital

 

 

 

V OUT

 

 

 

 

 

 

Isolators

 

–

 

 

 

AO GND

 

 

 

 

 

 

 

–

 

 

 

V OUT

 

AO 1

 

 

 

+

Channel 1

 

 

 

 

 

 

 

 

M Series Device

Figure 7-2.Analog Output Connections