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Appendix B
Troubleshooting
Power-On States of the Analog Output Lines
I have some motors connected directly into the outputs of my NI 6713, and when I power
on my computer they start running very slowly. I am reading an offset of 100 to 110 mV.
If I open the test panels in Measurement & Automation Explorer (MAX) or run any
LabVIEW application, the outputs drop to 0 V. Why is this happening and how do I
prevent it?
The power-on state for the outputs of the NI 6713 is 0 V, with an accuracy of ±200 mV. When
the computer is powered on, the output values might go to 100 to 110 mV, which are within the
specifications. When you run LabVIEW or the test panels in MAX, the driver loads the device's
calibration constants into the device and the voltage drops to zero.
If there is any hardware connected to the device, the best way to work around this problem is to
have an additional output (digital or analog) that will power on the device.
Update Rate
What is update rate?
Update rate is the fastest rate that you can output data from the device and still achieve accurate
results. For example, the NI 6723 has an update rate of 800 kS/s on one channel, and 204 kS/s
when using all channels. The fastest rate that the output voltage can change is also limited by the
device's slew rate.
B-2 | ni.com
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