Log in

View Full Version : roboRIO manual possible confusion

jnicho15
04-01-2015, 11:18
On page 9 of the manual, it reads:
Note The NI roboRIO contains an internal 120 W termination resistor between L (GRN) and H (YEL).
It appears that this "W" means ohm based off of this wikipedia entry: Where the [symbol] font is not supported, a W is displayed instead ("10 W" instead of "10 Ω", for instance). As W represents the watt, the SI unit of power, not resistance, this can lead to confusion.

Just thought this would be useful to know
richwong
04-01-2015, 11:52
Why didn't they just write out "ohm"?
Tungrus
04-01-2015, 12:00
On page 9 of the manual, it reads:

It appears that this "W" means ohm based off of this wikipedia entry:

Just thought this would be useful to know

...and all these years I was thinking W is for Watts - unit for power! One mre change I have to deal with this season!
jnicho15
04-01-2015, 12:24
FYI: W DOES NOT mean ohm, it is a font error
BenDSterling
04-01-2015, 13:03
W still stands for watt. It showed a W in this instance because of a font error. Since the ohm symbol was not supported by the font, a W was put in its place.

just to be clear, W stands for Watt, not ohm.
Al Skierkiewicz
05-01-2015, 08:56
jnicho15 (http://www.chiefdelphi.com/forums/member.php?u=85658),
Can you show which manual you are looking at for this info? If it is a pdf, it is likely you do not have the greek font loaded and have selected an option where Adobe inserts what it thinks is the correct symbol.
jnicho15
05-01-2015, 09:58
Page 9 ofhttps://decibel.ni.com/content/servlet/JiveServlet/download/30419-60-90614/roboRIO%20User%20Manual.pdf
Al Skierkiewicz
05-01-2015, 11:30
Yep, it displays as a W.
Michael Hill
05-01-2015, 11:34
We've got one of these on the RoboRIO!

http://m.ebay.com/itm/DALE-25-5-OHM-120-WATT-RESISTOR-/400251566962
Al Skierkiewicz
05-01-2015, 11:39
We've got one of these on the RoboRIO!

http://m.ebay.com/itm/DALE-25-5-OHM-120-WATT-RESISTOR-/400251566962

Have you included a fan as well?
crake
05-01-2015, 17:51
Have you included a fan as well?

Heh - please don't dissipate 120W in roboRIO in any form.

That is a typo/font issue. I'll get a request in to fix this.
Al Skierkiewicz
06-01-2015, 08:06
Chris,
Mike linked to a 120 watt resistor with fins on it.
crake
06-01-2015, 08:57
Chris,
Mike linked to a 120 watt resistor with fins on it.

Yup - pretty sure that's not included with roboRIO.
FrankJ
06-01-2015, 09:19
Is it against the rules to smear heat transfer paste all over the RoboRIO?
crake
06-01-2015, 09:33
Is it against the rules to smear heat transfer paste all over the RoboRIO?

Might make robot inspection interesting.