# Dithering a servovalve

**URL:** <https://forum.deltamotion.com/t/dithering-a-servovalve/40>\
**Category:** RMCTools\
**Created:** [March 31, 2008, 4:57pm UTC](https://forum.deltamotion.com/t/dithering-a-servovalve/40 "2008-03-31T16:57:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jacob\_Paso](https://forum.deltamotion.com/letter_avatar_proxy/v4/letter/j/439d5e/32.png) [@Jacob\_Paso](https://forum.deltamotion.com/u/Jacob_Paso)\
**Post date:** [March 31, 2008, 4:57pm UTC](https://forum.deltamotion.com/t/dithering-a-servovalve/40/1 "2008-03-31T16:57:11Z")

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**Outdated topic. See [Dithering Valves](https://forum.deltamotion.com/t/dithering-valves/1397)**

Some valves require dithering to prevent stiction. At this time, the RMC75 and RMC150 do not have a built-in dithering feature, but dithering can be done with a user program.

The attached project has two different programs that implement dither by continuously changing the Output Bias. One program only applies dither when the axis is stopped (in position control), and the other applies dither continuously.

A dither user program should always run. You can create a “\_FirstScan” condition in the Program Triggers to start this user program when the RMC eneters Run mode.  
[Dither.rmcproj](https://forum.deltamotion.com/uploads/short-url/i1ZV7IUenc17asniQ8pK4GH1nW1.rmcproj) (28.0 KB)

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**Author:** ![Leland](https://forum.deltamotion.com/letter_avatar_proxy/v4/letter/l/977dab/32.png) [@Leland](https://forum.deltamotion.com/u/Leland)\
**Post date:** [April 9, 2008, 10:02pm UTC](https://forum.deltamotion.com/t/dithering-a-servovalve/40/2 "2008-04-09T22:02:41Z")

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What’s “dithering?” What’s “stiction?” I’m new to both of those terms, but I love the RMC controllers!

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**Author:** ![plmailloux](https://forum.deltamotion.com/letter_avatar_proxy/v4/letter/p/df788c/32.png) [@plmailloux](https://forum.deltamotion.com/u/plmailloux)\
**Post date:** [September 15, 2011, 2:40pm UTC](https://forum.deltamotion.com/t/dithering-a-servovalve/40/3 "2011-09-15T14:40:01Z")

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the link for the download does not work anymore, is there someone who can make it work or deliver the file to the forum

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**Author:** ![Jay\_Pfaffman](https://forum.deltamotion.com/user_avatar/forum.deltamotion.com/jay_pfaffman/32/384_2.png) [@Jay\_Pfaffman](https://forum.deltamotion.com/u/Jay_Pfaffman)\
**Post date:** [September 15, 2011, 6:09pm UTC](https://forum.deltamotion.com/t/dithering-a-servovalve/40/4 "2011-09-15T18:09:07Z")

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The file link should work now. Thanks for pointing that out!