National Instruments Data Acquisition Device E Series - Manual (Page 82)

Chapter 3 Analog Output
E Series User Manual 3-2 ni.com
AO Sample Clock
The DAC reads a sample from the FIFO with every cycle of the AO Sample
Clock signal and generates the AO voltage.
Polarity and Reference Selection
Polarity and reference selection allow you to set the AO range. Refer to
Table 3-1 to set the range for your device. Refer to the
Polarity Selection
and the Reference Selection sections for more information.
To generate the AO External Reference signal, drive an analog voltage on
the AO EXT REF pin.
Note Not all E Series devices have every polarity and reference select option. For
example, devices such as the NI 6013/6014 and NI 6015/6016 are bipolar only with an
internal reference. Refer to the specifications document for your device for more
information about range-setting options.
Reference Selection
(NI 6020E, NI PXI-6040E, NI 6052E, NI 6062E, NI 6070E/6071E, and
PCI-MIO-16E-4 Devices Only)
You can connect each DAC to the device
internal reference of 10 V or to the external reference signal connected to
the external reference (AO EXT REF) pin on the I/O connector. This signal
applied to EXT REF should be within ±11 V. You do not need to configure
both channels for the same mode.
Table 3-1. Polarity and Reference Range
AO Range Polarity Select Reference Select
±10 V Bipolar Internal
0–10 V Unipolar Internal
±EXT REF Bipolar AO External Reference Signal
0–EXT REF Unipolar AO External Reference Signal