Rockwell-automation 1756-CFM ControlLogix Configurable Flowmeter Modul Manual de usuario descargar pdf (Pagina 142)

142Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

142 Frequency Accuracy

Use one of two equations to calculate the firmware error, in high resolution

frequency mode.

Choose the equation according to the frequency of your application.

 If your application has a frequency in the following range:

– 1Hz to 1/T

s

use the equation below:

 If your application has a frequency in the following range:

– greater than 1/T

s

to 120kHz

use the equation below:

EXAMPLE

Based on the equations listed above, if your application

uses a T

s

= 0.1 seconds, the “cut off ” frequency for

choosing an equation is 10Hz because 1/T

s

(or 1/0.1) =

10.

In other words, if your application uses a

T

s

= 0.1 seconds, for frequencies 1Hz to 10Hz, use the

following equation:

For frequencies greater than 10Hz to 1kHz, use the

following equation.

Accuracy =

F

in

40,000

Accuracy =

1

40,000

1

T

s

x

Accuracy =

F

in

40,000

Accuracy =

1

40,000

1

T

s

x

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