Campbell AVW200 series Manuale delle Istruzioni Scaricare il pdf (Pagina 67)

Appendix A. Conversion from Hertz

The calibration report provided with each vibrating wire sensor contains the

information required to convert Hertz, the frequency value output by the

AVW200, to the appropriate units (e.g., displacement pressure).

These steps convert Hertz to the appropriate unit (e.g., displacement, pressure):

1. If the values in the Calibration Report are in digits, use the following

equation to convert the AVW200’s frequency values from Hertz to digits.

Digits = (Hz/1000)

x 1000

2. Use the gage factors and polynomial provided in the Calibration Report to

calculate displacement.

A.1 Displacement Example

FIGURE A-1 provides a calibration report for a displacement transducer. The

following steps convert Hertz (the value output by the AVW200) to

displacement.

1. Convert Hertz to digits:

Digits = (Freq/1000)

*1000

2. displacement = (3.598e-9)*Digits

+ (1.202e-3)*Digits + (-3.1682)

Therefore,

if Freq = 2400 then:

Digits = (2400/1000)

x 1000 = 5760

displacement = (3.598e-9) * (5760)

+ (1.202e-3) * 5760 + (-3.1682)

= 3.875 inches

A-1

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Campbell AVW200 series Manuale delle Istruzioni Pagina 67