Ao Sample Clock; Reference Selection; Analog Output Resolution - National Instruments NI 6711 User Manual

Chapter 3 Analog Output

Analog Output Resolution

Analog Output Series User Manual

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. For more information on the
AO Sample Clock signal, refer to the
section.

Reference Selection

(NI 6711/6713/DAQCard-6715 and NI 6731/6733 Only)
allows you to set the AO range. Refer to Table 3-1 to set the range for your
device.
Table 3-1. AO Reference Selection Options
AO Range
±10 V Bipolar
±EXT REF Bipolar
You can calculate the least significant bit (LSB), or the minimal allowed
voltage change, on a voltage output on your AO Series device as follows:
LSB = output voltage range/2
where the output range is determined by your reference selection. Using
AO EXT REF, you can reduce the output voltage range and lower the
LSB, the minimum allowed voltage change. For more information on
using the AO External Reference signal, refer to the
(NI 6711/6713/DAQCard-6715 and NI 6731/6733 Only)
The following equation is an example of this formula using the
NI 6731/6733.
The denominator in the equation is derived from 2
NI 6731/6733 devices use 16-bit DACs.
Waveform Generation Timing Signals
Polarity
Internal
AO External Reference Signal
resolution of your device
20 V
305 μV
--------------- - =
65,536
3-2
Reference selection
Reference Select
Reference Selection
section.
16
= 65,536, since the
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