View Single Post
  #12   Spotlight this post!  
Unread 11-01-2009, 17:24
writchie writchie is offline
Engineering Mentor
AKA: Wally Ritchie
FRC #2152 (Team Daytona)
Team Role: Coach
 
Join Date: Dec 2007
Rookie Year: 2007
Location: Daytona Beach, Florida
Posts: 148
writchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond reputewritchie has a reputation beyond repute
Re: Current Measurement

Quote:
Originally Posted by DeepWater View Post
Ok, after some more searching I think I have found a current sensor exactly like what I had envisioned but I still don’t know if it is legal per the wording highlighted above in <R44>.

Are these Phidgets line of current sensors legal per <R44>?
If they are legal then they seem like they would be easy to connect to the cRIO analog inputs and program to read the current draw thus exactly solving our problem.

These are available from several places including Trossen Robotics.
IMHO these would be legal, assuming the supplier qualifies as FIRST legal. IMHO such hall effect units are the best solution because they are electrically isolated from the power leads.

Note that they are good for 500% overload i.e. 250 amps.

50 amps is probably not enough range for all conditions. You could probably replace the 50 amp parts with the 200 amp allegro parts. That would enable you to measure currents near stall conditions.