Talon SRX Missing Encoder Counts in Labview

[Ether]

What exact model number S5 are you using?

How fast are you spinning it?

[Ether]

Originally Posted by Ether

What exact model number S5 are you using?

If it's an S5-1000, the "1000" refers to CPR (cycles per rev). So I believe it would have 4000 edges per rev that need to be detected (TalonSRX decodes 4X).

[Chris_Elston]

Originally Posted by Ether

What exact model number S5 are you using?

How fast are you spinning it?

We have:

S5-1000-250-I-S-N
Is the model number.

I know the output shaft ratio, it's 4.71:1 soo...lets see according to VEX the encoder shaft is 3 times the output shaft... Maybe approx 3375 RPM? Does that sound right?

[Ether]

Originally Posted by Chris_Elston

We have:

S5-1000-250-I-S-N
Is the model number.

That's a 1000 CPR encoder. It's 4000 PPR at 4X.

Maybe approx 3375 RPM?

That's 4.4 microseconds per edge, assuming zero tolerance on symmetry and quadrature delay.

I could not find symmetry or quadrature delay specs in the S5 datasheet.

The S4 datasheet has max quadrature delay tolerance of 60 electrical degrees. I doubt the S5 is that bad (because the disk is assembled at the factory, not by the user), but just for comparison: with a quadrature delay tolerance of 60 electrical degrees, the microseconds per edge could be as fast as 1.5.