Futek VCal Sensor Verification Manuel d'utilisateur télécharger pdf (Page 46)

Futek Advanced Sensor Technology – Futek VCal™Documentation Rev. 1.8.0 07/26/05

©Futek Advanced Sensor Technology 2005

Instructions For Performing A Calibration Verification

A test cell calibration describes the procedure determining the sensitivity of an unknown sensor, or a repetition of previous tests to acquire

comparable data. The sensor calibration interface allows you to test various sensors under a pre-determined load. The load would usually be

supplied by a pre-calibrated reference sensor or a dead weight load or pressure system. When the interface is loaded you will choose initially

which channel the reference sensor is connected to and which channel the test sensor is connected to. It makes no difference which cell is

connected to which channel, although under normal circumstances channel 1 would be used for the reference sensor.

Now that you have gotten familiar with the layout of the Calibration interface, and we have discussed configuring your test (setting Test Modes,

and Options, Conditions and Parameters), and we have discussed the three different types of tests (Main, Time, and Signature), let’s walk

through a couple of examples and take a look at some pictures that will illustrate the calibration procedures described here.

Example Calibration Verification (Main Test): (Please refer to the screen shot below as a visual aid for performing the following steps:)

1. The first step in performing a Calibration Verification is to fill in all the information we have just talked about; starting with the Info tab, to

the Initial tab, and on through the Setup tab. Once you have filled in all required information on these three tabs you can press the Begin Test

Button, and the Test Grid will be filled in based on the information you have provided on these Information Tabs.

2. Once the Test Grid appears with the Load Points you chose filled in, you will want to connect the reference and test sensors to the

appropriate channels (if they are not connected already), and the temperature probe to the Power Face Plate of your VCal™.

3. The next step would be to take a First Zero (unfixtured) reading by going to the Test tab, making sure the cell is under no load,

pressing the Gross button on the Test Grid window, clicking into the First Zero text box, and either pressing Enter, or clicking the

Un-fixtured button next to the First Zero text box.

4. Next you would fixture your sensors, Tare both channel displays, click into the first output grid box and press Enter to take a

first fixtured zero reading.

5. Next you would click into the second output grid box, load the cells (with either dead weight or pressure system) until the reference

cell display reflects the first load point ( 500 lb in our example), and then press Enter.

6. Repeat Step 5 for each of the remaining load points.

7. Take a final fixtured zero with no load applied, by clicking into the last output grid box and pressing Enter.

8. Take a final unfixtured zero with no load applied, by clicking into the Final Zero Box, and pressing Enter.

Step 4

Step 5

Step7

Step 3

Step 8

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Futek VCal Sensor Verification Manuel d'utilisateur Page 46

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