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board level calibration (None) specifies whether a board-level calibration has to be performed before the system calibration. The default is None.
This option is available only for DSA and E Series boards. Performing a board-level calibration can significantly increase the time needed to perform the entire system calibration.
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coupling & input config specifies the coupling and input configuration of the selected channel.
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coupling (AC) specifies the coupling setting of the selected channel. AC is the default.
| 0 | no change | | 1 | DC | | 2 | AC | | 3 | GND | | 4 | internal ref. |
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input config specifies the input configuration setting of the selected channel.
| No change (default) |
No change (default) is the default device input configuration. Refer to the device documentation for information about the default input configuration. |
| Differential | The differential configuration has neither of its inputs tied to a fixed reference, such as earth or building ground. |
| Ref. single-ended | The referenced single-ended (RSE) configuration measures the signal with respect to a ground directly connected to the measurement system ground. |
| Non-ref. single-ended | The nonreferenced single-ended (NRSE)configuration measures the signal with respect to a single ground, but the potential may differ from the measurement system ground. |
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input limits assigns the limits for the selected channel.
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high limit (1.0) specifies the maximum scaled data the device measures for the selected channel. The default is 1.0 V.
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low limit (-1.0) specifies the minimum scaled data the device measures for the selected channel. The default is –1.0 V.
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device is the device number you assign to the Traditional DAQ device during configuration. The default is 1.
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channel specifies the analog input channel to be calibrated. The default is channel 0.
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calibration value [EU rms] specifies the reference signal level generated by the calibrator.
calibration value [EU rms] is expressed in the engineering units selected in channel info.
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calib. value is in dB specifies whether or not the calibration value is expressed in decibels. The default is TRUE.
If the calibration value is expressed in decibels, dB reference has to be specified in channel info.
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calibration frequency [Hz] specifies the frequency of the reference signal in hertz.
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channel info contains information about the measurement system used before the signal reaches the DAQ device.
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sensor sensitivity [mV/EU] specifies the sensitivity of the sensor in mV/EU.
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engineering units specifies the engineering units.
If you are using a microphone, select Pa. If you are using an accelerometer, select g, m/s^2, or in/s^2. If the units you need are not listed, select custom and enter the unit to use in custom label.
| custom... | V
| A
| Pa
| N
| g
| m/s^2
| m/s
| m
| mm/s
| mm
| micron/s
| micron
| in/s^2
| in/s
| in
| mil/s
| mil
| rad/s^2
| rad/s
| rad
| strain
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dB reference [EU] is the reference value used when results are computed in decibels.
dB reference [EU] is expressed in the selected engineering units. The typical decibels reference for sound pressure level is 20E–6 Pa. When engineering units is set to Pa, the dB reference [EU] is automatically set to 20E–6 Pa.
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custom label is the string used for units when engineering units is set to custom.
If engineering units is not set to custom, this parameter is ignored.
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weighting filter specifies if any weighting filter has been applied to the signal. This control does not apply any weighting to the signal. weighting filter should always return linear for calibration measurements.
Use weighting filter only if the acquired signal has been weighted by an external device before it is acquired by a DAQ device. If a weighting filter was applied to the signal before reaching the DAQ device, using weighting filter prevents subsequent VIs from applying any additional weighting to the weighted signal.
| Linear |
| A-weighting |
| B-weighting |
| C-weighting |
| ITU-R 468.4 |
| Dolby |
| CCITT |
| C-message |
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pregain [dB] is the pregain applied by an external amplifier expressed in decibels. A value of 0 dB specifies no pregain.
Use pregain [dB] only if an external device amplifies the signal before a DAQ device acquires the signal. If you apply any gain with the DAQ device itself, the driver software takes this into account and you do not need to enter the information.
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duration [s] specifies how many seconds of data are acquired to calibrate the selected channel.
The actual duration of the calibration process could be longer than this value, especially if you select self calibrate device.
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sampling frequency [Hz] specifies the sampling frequency for data acquisition in hertz.
If you are using a DAQ device, confirm that the device supports this frequency.
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frequency tolerance [%] specifies the percent difference this VI tolerates between the actual measured frequency and the specified calibration frequency.
If the difference exceeds this value, the VI returns an error.
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calibrated sensor sensitivity [mV/EU] returns the measured sensor sensitivity in mV/EU.
The VI also returns this value as sensor sensitivity [mV/EU] in calibrated channel info.
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calibrated channel info contains the calibrated sensor sensitivity. All other information is identical to channel info.
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sensor sensitivity [mV/EU] contains the sensitivity of the sensor expressed in mV/EU.
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engineering units specifies the engineering units.
If you are using a microphone, select Pa. If you are using an accelerometer, select g, m/s^2, or in/s^2. If the units you need are not listed, select custom and enter the unit to use in custom label.
custom...
| V
| A
| Pa
| N
| g
| m/s^2
| m/s
| m
| mm/s
| mm
| micron/s
| micron
| in/s^2
| in/s
| in
| mil/s
| mil
| rad/s^2
| rad/s
| rad
| strain
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dB reference [EU] is the reference value used when results are computed in decibels. dB reference [EU] is expressed in the selected engineering units.
The typical decibels reference for sound pressure level is 20E–6 Pa. When engineering units is set to Pa, the dB reference [EU] is automatically set to 20E–6 Pa.
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custom label returns the string used for units when engineering units is set to custom.
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weighting filter specifies if any weighting filter has been applied to the signal.
| Linear |
| A-weighting |
| B-weighting |
| C-weighting |
| ITU-R 468.4 |
| Dolby |
| CCITT |
| C-message |
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pregain [dB] is the pregain applied by an external amplifier expressed in decibels.
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amplitude [V rms] returns the measured amplitude of the calibration signal in volts root-mean-square (V rms). This is the measured amplitude of the signal at the calibration frequency only.
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frequency [Hz] returns the measured frequency of the calibration signal in hertz.
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overload indicates whether or not the selected channel was overloaded during the calibration process.
If the channel was overloaded, increase input limits or use a lower calib. value is in dB, if the calibrator permits.
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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
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code is the error or warning code.
If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
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source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
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weighting conflict returns TRUE if channel info shows that a weighting filter has already been applied to the signal.
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