NI WSN-3214 Waveform Analog Input Properties
- Updated2023-02-21
- 4 minute(s) read
Select the channel or channels to configure. This dialog box includes the following components:
Channel Configuration
Default = Full Bridge – Strain Type I
| Bridge Type | Description |
|---|---|
| Full Bridge – Strain Type I | Four active strain gage elements. Two are mounted in the direction of bending strain on the top side of the strain specimen and the other two mounted in the direction of bending strain on the bottom side. See also Strain Gages and Strain Gage Bridge Configurations. |
| Full Bridge – Strain Type II | Four active strain gage elements. Two are mounted in the direction of bending strain with one on the top side of the strain specimen and the other on the bottom side. The other two act together as a Poisson gage and are mounted transverse, or perpendicular, to the principal axis of strain with one on the top side of the strain specimen and the other on the bottom side. See also Strain Gages and Strain Gage Bridge Configurations. |
| Full Bridge – Strain Type III | Four active strain gage elements. Two are mounted in the direction of axial strain with one on the top side of the strain specimen and the other on the bottom side. The other two act together as a Poisson gage and are mounted transverse, or perpendicular, to the principal axis of strain with one on the top side of the strain specimen and the other on the bottom side. See also Strain Gages and Strain Gage Bridge Configurations. |
| Half Bridge – Strain Type I | Two active strain gage elements, one mounted in the direction of axial strain and the other acting as a Poisson gage and mounted transverse, or perpendicular, to the principal axis of strain. See also Strain Gages and Strain Gage Bridge Configurations. |
| Half Bridge – Strain Type II | Two active strain gage elements, one mounted in the direction of axial strain on the top side of the strain specimen and the other mounted in the direction of axial strain on the bottom side. See also Strain Gages and Strain Gage Bridge Configurations. |
| Quarter Bridge – Strain Type I | A single active strain gage element mounted in the principle direction of axial or bending strain. See also Strain Gages and Strain Gage Bridge Configurations. |
| Full Bridge – Ratiometric | Four active bridge elements with an output in millivolts per volt (mV/V). See also Strain Gages and Strain Gage Bridge Configurations. |
| Half Bridge – Ratiometric | Two active bridge elements with an output in mV/V. See also Strain Gages and Strain Gage Bridge Configurations. |
| Quarter Bridge – Ratiometric | One active bridge element with an output in mV/V. See also Strain Gages and Strain Gage Bridge Configurations. |
| Channel Disabled | Disabled channels are not sampled and are not sent to the gateway. |
Sensor Properties
| Property | Value/Description | ||
|---|---|---|---|
| Range | Microstrain (µε) when Strain, mV/V when Ratiometric. The default value is Microstrain (µε). | ||
| Gage Factor |
Returns or sets the Gage Factor. The Gage factor specifies the sensitivity of the strain gages and relates the change in electrical resistance to the change in strain. Each gage in the bridge must have the same gage factor. Refer to the sensor documentation to determine this value. The default value is 2.
Possible inputs are:
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| Calibration, Offset Null (mV/V) |
The Offset Null value is added to the calibrated ratiometric reading. It can be measured by clicking Run in the node properties window for each channel. This value is applied automatically in all bridge configurations. The default value is 0.
Possible inputs are:
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| Poisson Ratio | Sets the Poisson Ratio. Poisson ratio is the ratio of lateral strain to axial strain in the material you are measuring. The default value is 0.
Possible inputs are:
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| Quarter Bridge Gage Resistance | Sets the Quarter Bridge Gage Resistance. Quarter bridge gage resistance is the resistance in ohms of the gage in an unstrained position. The default value is 350.
Possible inputs are:
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| Shunt Calibration (1/Actual Gain) |
The Shunt Calibration value is a gain applied to the post-ADC calibrated ratiometric value. This value will always be applied regardless of bridge configuration, as it can be calculated and/or measured through external means. This value is applied in all configurations. The default value is 1.
Possible inputs are:
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