Encoder Rate Doesn't Work

[Steve Hyde]

Having trouble using the rate output of the encoders.  Using the Encoder Example vi, going a constant speed, the rate in one direction is zero and the rate in the other direction is intermittently zero.  The pulses coming out of the encoder are accurate.  Any hints or is this a bug with the encoder vi?

[Steve Hyde]

The encoder rate works if deployed at 1x or 2x but not at 4x.  The behavior at 4x deployed remains the same as described.  ???  What is wrong with 4x?  (Digging into the Encoder Get VI, the 4x is different from the 1x & 2x.)

[Philbot]

Are you using averaging?

I think I just read that the minimum averaging for 4x encoding is 2 (the default).

Setting averaging to 1 causes problems.

[Steve Hyde]

Thanks Philbot.  We were using 1 for averaging in the code we were testing.  We will try more than 1 and see what happens.

[Steve Hyde]

Still can't get 4x to work with averaging greater than 1. 1x & 2x works fine so we're going to stick to 2x.

[sciencewhiz]

Are you using LabVIEW update 3 with the v11 image?

[DAQjr]

The default in hardware is 2, but the default on the configure timer VI is 1.  That can be a source of confusion.  Just make sure you use at least 2 for averaging in 4x mode with the latest update.  Before update 3, the rate output of the encoders was not accurate in any mode.

[Steve Hyde]

I am using software version 3.0a.

[Steve Hyde]

I was using 4 as the value for averaging during 4x mode.