1.4 Calibration
14 Acqiris SA240P User's Manual
Smart-calibration
The smart calibration implemented in MD3 drivers allows to save time by automatically keeping in
memory the calibration information from any self-calibration performed since the beginning of the
session. When the acquisition parameters are changed, no re-calibration of the card is necessary if
a self-calibration has already been performed with the same acquisition conditions (i.e. the same set
of parameters), unless the clock mode parameters are changed.
Indeed, any change in the clock mode parameters (i.e. External clock frequency or Reference
mode parameters), induces a restart of the clocks which requires a new self-calibration.
For details, see Parameter change requiring a new self calibration (page 72).
Calibration optimized for a target voltage
It is possible to optimize the calibration for a specified target voltage. In this case, the self-calibration
will minimize the noise level at the channel input value equal to this specified target voltage. For
details, see Calibration optimized for a target voltage (page 71).
Factory calibration
Factory calibration is the process of measuring the actual performance of a device-under-test (DUT)
using laboratory instruments that have significantly better performance than the DUT. Laboratory
instrument performance must be traceable to the International System (SI) Units via a national
metrology institute (NIST, NPL, NRC, PTB, CENAM, INMETRO, BIPM, etc.)
The measured performance is then compared to published datasheet specifications. For each
factory calibration, Acqiris tests the performance corresponding to all datasheet specifications, for
every installed option. If needed, the DUT is adjusted and re-qualified ; ensuring it is in line with full
specifications.
Our ADC cards are calibrated at factory during the production phase. There is no need to
systematically calibrate each year.
Firstly, the cards include a self-calibration function providing a good degree of confidence that your
card is operating within its specifications on a day-to-day basis, and triggering an error message if
out of calibration relative to the internal calibration signal.
Secondly, our cards are warranted to stay within specification over the standard 5-year warranty.
They usually stay within specification much longer and we rarely have to effectively recalibrate the
cards.
Lastly, a onetime calibration can be ordered in case customer detects a deviation in the measure of
its final product that appears to be caused by the ADC card. The onetime calibration consists in
processing the card through production test to determine if it is still within specification:
If yes, the ADC card is returned with the certificate of calibration which certifies it is within spe-
cification.
If not, the required calibration is performed, and another production test is done to provide the
certificate of calibration.
If repair is required, and the card is out of warranty, a repair quote will be provided.
For more information, or to request for a calibration, please contact technical support
support@acqiris.com.
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