What is the long term stability of USB-6008 Analog Outputs?

[Eyal]

The datasheet of USB-6008 do not specify the long term stability of the analog inputs and outputs.

I am looking for stability versus ambient temperature and time (several months to a year), mainly for the outputs or D/A reference voltage.

Is there any information available?

Thanks.

[Seth_B.]

Eyal,

The information you need is in the User Manual and Specifications for the 6008/6009.  You can access this manual either from that link or by going to the product page and selecting Resources » Manuals.  The data sheet is simply marketing documentation designed to give a very brief overview of the product.  Any specifications we have for a device will be listed in the specifications manual or the specifications portion of the user manual.  Please note that the accuracy specifications in the manual are good for one year after the last external calibration.  You can check the last external calibration date by selecting the device in Measurement and Automation Explorer and selecting "Calibration" at the bottom.  Give the very low cost of the USB-6008, there is not currently an option to send the device in for recalibration, as it would be more expensive to calibrate the device than it would be to replace the device with a new 6008.

[Eyal]

Seth,

I had this manual but did not consider "accuracy" the same as "stability".

The spec's stated are:

Absolute accuracy (no load) ...................7 mV typical,

36.4 mV maximum at full scale

If this accuracy includes stability per year, then at full scale there is 36.4mV/5V=0.728% accuracy and stability.

Is this correct?

[Seth_B. · Accepted solution]

The accuracy specification takes in to account changes both due to temperature and time (stability).  Thus, for the one year period that we guarantee these specifications, what you list is correct.  However, outside the one year period since calibration, this specification may no longer be accurate.