Measurement-computing StrainBook/616 Bedienungsanleitung PDF herunterladen (Seite 48)

4-18 Software 967594 StrainBook/616 User’s Manual

The External Shunt Calibration method requires that the user enter the following 5 parameters:

Excitation - The val

ue of the constant voltage source used to excite the gage.

Max Load - The m

aximum load value that the gage is expected to measure. This value could be less than

the max rated load of the gage.

Quiescent Load -

The minimum load value that the gage is expected to measure. This value could be

greater than the minimum rated load of the gage.

Point 1 Units - The user-suppl

ied, at rest value of the load applied to the gage. If no load is applied to the

gage in its quiescent state, enter “0”zero.

Point 2 Units - The user-suppl

ied effective load value that will appear at the gage when the external shunt

resistor is switched into place. This load value must be calculated based on the value of the

external shunt resistor.

As with the Internal Shunt method, calibration accuracy is directly tied to the accuracy and stability of the shunt

resistor used.

Name Plate Calibration

Name Plate Calibration is similar to the 2 Point Auto Calibration method. No actual measurements are taken

during the calibration process. The calibration constants are calculated from information provided by the user. The

method is called “Name Plate” because the calibration information is obtained from the Name Plate or Label that is

attached to the gage or load cell.

The Name Plate Calibration method requires that the user enter the following 5 parameters:

Excitation - The val

ue of the constant voltage source used to excite the gage.

Sensitivity -

The output of the gage measured in millivolts per volt.

Full Rated Load -

The maximum rated load of the gage.

Max Load - Th

e maximum load value that the gage will be expected to measure. This value could be less

than the max rated load of the gage.

Quiescent Load -The m

inimum or at rest value of the load applied to the gage. If no load is applied to the

gage in its quiescent state, enter zero. WaveView assumes the Min Load value is equal to the

quiescent load value.

Calibration Example using the Name Plate Method and a Load Cell

The following example uses Name Plate calib

ration with a load cell.

Load cells come with a mV/V specification (frequently referred to as sensitivity) which m

eans 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.

From the above data we know the following parameters:

• Ex

citation Voltage = 10 volts

• M

aximum Applied Load = 1500 pounds

• Qui

escent Tare = 10 pounds

• Sen

sitivity = 3 mV/V

• Ful

l Rated Load = 3000 pounds

Note: These 5 values are used

in the following figure.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 145 146

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