# Symmetrical quadrupole device of dc

**URL:** <https://simpeg.discourse.group/t/symmetrical-quadrupole-device-of-dc/331>\
**Category:** DC and IP\
**Created:** [May 26, 2022, 1:29pm UTC](https://simpeg.discourse.group/t/symmetrical-quadrupole-device-of-dc/331 "2022-05-26T13:29:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![peterfen-eng](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@peterfen-eng](https://simpeg.discourse.group/u/peterfen-eng)\
**Post date:** [May 26, 2022, 1:29pm UTC](https://simpeg.discourse.group/t/symmetrical-quadrupole-device-of-dc/331/1 "2022-05-26T13:29:09Z")

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When I was using dipole in dc, I tried to change it to a symmetric quadrupole, which can be measured, but two sets of data are 0 (there are 0 values), I don’t quite understand why, does anyone understand, thanks, the data file seems to be impossible to upload.

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**Author:** ![sgkang09](https://yyz2.discourse-cdn.com/free1/user_avatar/simpeg.discourse.group/sgkang09/32/8_2.png) [@sgkang09](https://simpeg.discourse.group/u/sgkang09)\
**Post date:** [May 28, 2022, 6:10pm UTC](https://simpeg.discourse.group/t/symmetrical-quadrupole-device-of-dc/331/2 "2022-05-28T18:10:07Z")

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uploading your script would be useful, othetwise it is hard to identify what you are asking for.