8.2 How to calibrate the card?
U5303A User's Manual
81
The
Channel.CalibrationTargetVoltage
property allows to define, in volts, the channel input
level at which the noise level will be minimized by the self-calibration. This value is only used if the
property
Calibration.TargetVoltageEnabled
is true.
Parameter change requiring a new self calibration
The table below lists the parameters that require a new self calibration of the card when changed.
Group
Category
Parameter
Calibration required
A
Acquisition
Sampling rate
Only the 1st time, for an identical set of parameter
values
Channel parameters
Vertical range
Input filter Bypass (Yes/No)
Interleave (Enable or not)
CalibrationTargetVoltage
Only if
Calibration.TargetVoltageEnabled
is true.
And each time this parameter changes
Offset
B
Trigger
Trigger source
Only the 1st time
C
External reference
Reference mode (External or
Internal Reference)
Each time this parameter changes
Clock mode
External clock frequency
Each time this parameter changes
Clock source
Each time this parameter changes
The channel parameters are calibrated independently per channel.
Saving and restoring calibration setup
It is also possible to save calibration parameters and restore them during future sessions.
The function
IAqMD3Calibration SaveToFile
allows to save in a single file the calibration
values from all calibrations done in the current user session IVI.NET method:
IAqMD3Calibration.SaveToFile
, IVI-C function:
AqMD3_CalibrationSaveToFile
).
In the next session, after performing a single calibration, user can restore all the saved calibration
values using
Calibration Load From File
function (IVI.NET method:
IAqMD3Calibration.LoadFromFile
, IVI-C function:
AqMD3_CalibrationLoadFromFile
).
To guarantee acquisition accuracy, at least one calibration with the chosen clock mode and trigger
source (group B and C) has to be performed when starting a new session.Thus the Save and Load
functions, only apply to Acquisition sampling rate and Channel parameters (group A). Only these
parameters can be re-used between sessions.