ADLINK PXI-9527 - Manual (Page 48)

38 Calibration
4.2 Auto-Calibration
Because errors in measurement and outputs will vary with time
and temperature, re-calibration is recommended when the module
is installed. Auto-calibration can measure and minimize errors
without external signal connections, reference voltages, or mea-
surement devices.
The PXI-9527 has an on-board calibration reference to ensure the
accuracy of auto-calibration. The reference voltage is measured
on the production line and recorded in the on-board EEPROM.
Before initializing auto-calibration, it is recommended to warm up
the PXI-9527 for at least 20 minutes and remove connected
cables.
4.3 Offset Error Compensation During AI Sampling
Rate Change
For optimal measurement results, the PXI-9527 is equipped with
an internal offset error compensation mechanism to respond to
changes in the AI sampling rate. Compensation times required for
various sampling rates are shown. For example, when sampling
rate is changed from 432 kS/s to 2 kS/s, 6.2 sec is required for off-
set compensation. When the sampling rate is next set between 2
kS/s and 53.999 kS/s, it is not necessary to have 6.2 sec for the
offset compensation. Only a sampling rate set to different ranges
will generate a compensation time.
NOTE: NOTE:
It is not necessary to manually factor delay into applica-
tions, as the PXI-9527 driver automatically adds the
compensation time.