Measurement-computing WaveBook rev.3.0 Manual de usuario descargar pdf (Pagina 73)

WaveBook User’s Manual,

ch03C 6-21-99

WBK Expansion Options, WBK16 3-41

Calibrating a Sensor Using the Sensor Calibration Program

Before proceeding with calibration, remember to enter your password. The password

must be entered before channel parameters can be changed.

Unless all of the parameters (for each channel to be calibrated) are accurately entered

into the spreadsheet, the calibration will produce incorrect results.

The WBK16 sensor calibration program uses four basic methods of calibration: Name Plate, Shunt, 2-Point

Manual, and 2-Point Automatic. All four methods require values for the excitation voltage, maximum

applied load, and quiescent/tare for all sensor types.

Calibration Methods

Name Plate

Required

Calibration

Parameters

Strain Gage Load Cell or

Transducer

Shunt 2-Point Manual

2-Point

Automatic

Excitation Voltage

33 3 3 3

Max. Applied Load

33 3 3 3

Quiescent/Tare

33 3 3 3

Gage Factor

Sensitivity

Full Rated Load

Shunt Load Value

Bridge Resistance

Point 1 (mV Input)

Point 1 (Units Input)

333

Point 2 (mV Input)

Point 2 (Units Input)

To use any of these calibration methods, enter the appropriate values into the required spreadsheet columns

of the

WBK16 Sensor Calibration

window, as listed above, and click on the

Calibrate Enabled Channels

button on the toolbar.

In 2-Point Manual calibration, a message box prompts you to apply the first load. When

prompted, apply the load and click the OK button. A second message box will prompt

you to apply the second load. When prompted, apply the second load and click OK.

Saving a Calibration File.

After calibrating the enabled channels, a message box asks if you want to save

the changes. Click on the

Yes

button to save the calibration and a dialog box will appear. If you choose not

to save the changes at this time, another message will appear asking if you want to save the changes when

you click on the

Return to WaveView

button on the tool bar. Click on the

Yes

button to save these changes

and a dialog box will appear. The most recently saved calibration file will be recorded in the

WAVEVIEW.CFG default configuration file and will be loaded into WaveView whenever a new session is

started. The current configuration can also be saved from the toolbar or

File

menu item.

Calibration Example

The following example uses Name Plate calibration with a load cell.

Load cells come with a mV/V specification (frequently referred to as sensitivity) which means for each volt

of excitation at maximum load, the load cell will output a specific millivolt level.

Consider a 3000-pound load cell rated at 3 mV/V using 10 V of excitation. When the load cell is used, a 10-

pound platform will be placed on it. Although the load cell is rated at 3000 pounds, 1500 pounds is the

maximum load that will ever be applied for this example.

According to the previous table, the required parameters for a Name Plate calibration when a load cell is

used are excitation voltage, maximum applied load, quiescent/tare, sensitivity and full rated load. From the

above data we know the following parameters:

• Excitation Voltage = 10 volts

•

Maximum Applied Load = 1500 pounds

• Quiescent Tare = 10 pounds

•

Sensitivity = 3 mV/V

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Measurement-computing WaveBook rev.3.0 Manual de usuario Pagina 73

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