NI 5922 Calibration Procedure
6
ni.com
3.
Call
niScope_CalSelfCalibrate
(niScope Cal Self Calibrate VI)
with the following parameters:
•
sessionHandle
: The instrument handle that you obtain from
niScope_init
(niScope Initialize VI)
•
channelList
:
VI_NULL
•
option
:
VI_NULL
Because the session is a standard session rather than an external
calibration session, the new calibration constants are immediately
stored in the EEPROM. Therefore, you can include this procedure in
any application that uses the digitizer.
4.
Call
niScope_close
(niScope Close VI) to close the session handle.
Set the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
External Calibration Options
External calibration involves both adjustment and verification. Adjustment
is the process of measuring and compensating for device performance to
improve the measurement accuracy. Performing an adjustment updates the
calibration date, effectively resetting the calibration interval. The device is
guaranteed to meet or exceed its published specifications for the duration
of the calibration interval. Verification is the process of testing the device
to ensure that the measurement accuracy is within certain specifications.
Verification can be used to ensure that the adjustment process was
successful or to determine if the adjustment process must be performed.
During verification, you must compare the measurement error to limits
given in Tables 3 through 8.
This document provides two sets of test limits for most verification
stages—the
calibration test limits
and the
published specifications
. The
calibration test limits are more restrictive than the published specifications.
If all of the measurement errors determined during verification fall within
the calibration test limits, the device is guaranteed to meet or exceed its
published specifications for a full calibration interval (two years). For this
reason, you must verify against the calibration test limits when performing
verification after adjustment. If all of the measurement errors determined
during verification fall within the published specifications, but not within
the calibration test limits, the device is meeting its published specifications.
However, the device will not necessarily remain within these specifications
for an additional two years. The device will meet published specifications
for the remainder of the current calibration interval. In this case, you can
perform an adjustment if you want to further improve the measurement
accuracy or reset the calibration interval. If some measurement errors
determined during verification do not fall within the published
