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Reply to "Pseudo tach for variable input speeds"

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F2 Pseudo Tach

"Enable Pseudo Tach for time synchronous averaging or order tracking intermediate shafts in gearboxes that cannot be accessed directly. Use the Pseudo Tach to produce the turning speed signal. The analyzer uses the following formula: (Incoming tachometer frequency) X ((tach frequency X the number of teeth on the tached shaft)/number of teeth on the pseudo shaft). Disable Pseudo Tach when you can use the tachometer directly on a shaft. The default is Disabled."

I guess CSI makes it more complicated than necessary! If your tachometer frequency is based on a 1/Rev shaft target on the motor shaft, then the Intermediate shaft rpm is the ratio of INput/OUTput gear teeth. If your tachometer frequency is based on a N/Rev (pinion gear teeth), then the INput speed (pinion or motor) is Tachometer frequency divided by the number of teeth (N). It follows that the Intermediate speed is still the ratio of the number of teeth on each shaft.

I can't add any more than this, so you just have to try it!

Walt

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