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Chapter 5 Analog Output
NI 6238/6239 User Manual 5-4 ni.com
the buffer at a fast enough rate to keep up with the generation, the buffer
will underflow and cause an error.
Analog Output Triggering
Analog output supports two different triggering actions:
• Start trigger
• Pause trigger
A digital trigger can initiate these actions. NI 6238/6239 devices support
digital triggering, but do not support analog triggering. Refer to the AO
Start Trigger Signal and AO Pause Trigger Signal sections for more
information on these triggering actions.
Connecting Analog Current Output Signals
AO <0..1> are the current output signals for AO channels 0 and 1. AO GND
is the ground reference for AO <0..1>.
Figure 5-2 shows how to make analog current output connections to the
device.
Figure 5-2. Analog Current Output Connections
Tip Internal voltage drop for the NI 6238/6239 devices is a maximum of 3 V relative to
the externally supplied voltage.
Caution The maximum output voltages rating of AO signals and input voltage ratings for
AO power supply with respect to AO GND and earth/chassis ground are listed in the
User-
Provided
Load
–
+
User-
Provided
Power
Supply
DAC
Internal
Voltage
Drop
AO Power
Supply Pin
AO
x
User-Provided
AO GND
AO GND
NI 6238/6239