Measurement-computing Personal Daq rev.6.0 Manual de usuario descargar pdf (Pagina 51)

Example 2:

A Personal Daq user knows that a linear relationship exists between the voltage output at "Point A" and the

voltage output at "Point B" in a certain electrical device. The linear relationship is constant. The user

wants to monitor the voltage at "Point B," however; it is inconvenient to connect signal lines in that section

of the apparatus.

The user realizes he can take the reading at "Point A" and use the mx + b equation to solve for

"Point B." In this example, B

Volts

= 1.2x + 0.75 Volts, where B

volts

is the voltage at "Point B" and

x is the voltage at "Point A."

After his acquisition was configured, the user performed the following steps to allow

Personal DaqView to calculate and display B

Volts

1. Left-clicked/right-clicked on the units cell for PD1_A01, typed in

B:Volts, and hit the

keyboard’s Enter key.

2. Left-clicked/right-clicked on the Scale cell for PD1_A01, typed

1.2 for the Scale, and hit

the keyboard's Enter key.

3. Left-clicked/right-clicked on the Offset cell for PD1_A01, typed

0.75 for the Offset, and

hit the keyboard's Enter key.

4. Used channel PD1_A01 to acquire voltage readings which represented the voltage at

"Point B" (B:Volts).

5. Selected the Digital Meters button (14) on the Main Control Window’s toolbar and

configured the meter to display readings for PD1_A01 (B:Volts) and PD1_A02.

6. Clicked the Update All Indicators button (10) on the Main Control Window’s toolbar and

monitored the readings.

PD1_A01 B:Volts Readings resulting from use of the Scale/Offset Feature.

In this example B:Volts is being displayed on the Analog Input Spreadsheet and in a Digital Meter.

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Measurement-computing Personal Daq rev.6.0 Manual de usuario Pagina 51