# Need help on history aggregation mode

**URL:** <https://forum.inductiveautomation.com/t/need-help-on-history-aggregation-mode/27912>\
**Category:** Ignition\
**Created:** [August 30, 2019, 6:03pm UTC](https://forum.inductiveautomation.com/t/need-help-on-history-aggregation-mode/27912 "2019-08-30T18:03:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![nader.chinichian](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nader.chinichian/32/9261_2.png) [@nader.chinichian](https://forum.inductiveautomation.com/u/nader.chinichian)\
**Post date:** [August 30, 2019, 6:03pm UTC](https://forum.inductiveautomation.com/t/need-help-on-history-aggregation-mode/27912/1 "2019-08-30T18:03:44Z")

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Hi

I face some issue with history aggregation mode. I have a tag with steady value of 100 all the time.

 ![Untitled](https://us1.discourse-cdn.com/inductiveautomation/original/2X/8/8c7efca534f73c40664cc70b4ac8895fa6e539ca.jpeg)  
When I try to get minimum, maximum and range of the signal in time range it return 100 for all of them.  
I wonder why it return 100 instead of 0 for range aggregation mode???  
I define signal with following setting:  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/2/23da30cb3cbc1b8fd486e63f18611e6ad1d080a1.png)  
I also try to enable prevent interpolation and get Null for Range.  
Could some one please help me and tell what is happening here.  
Thanks

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<div class="post-metadata">

**Author:** ![nader.chinichian](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nader.chinichian/32/9261_2.png) [@nader.chinichian](https://forum.inductiveautomation.com/u/nader.chinichian)\
**Post date:** [August 30, 2019, 6:19pm UTC](https://forum.inductiveautomation.com/t/need-help-on-history-aggregation-mode/27912/2 "2019-08-30T18:19:39Z")

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It seems the interpolation doesn’t work correctly. The aggregation analyse only work with real record not interpolation value. I wonder it’s a bug or I miss something here.

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<div class="post-metadata">

**Author:** ![nader.chinichian](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nader.chinichian/32/9261_2.png) [@nader.chinichian](https://forum.inductiveautomation.com/u/nader.chinichian)\
**Post date:** [August 30, 2019, 6:40pm UTC](https://forum.inductiveautomation.com/t/need-help-on-history-aggregation-mode/27912/3 "2019-08-30T18:40:35Z")

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Here is another example with even available record but still wrong result:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/c/c79e8c915da66dce2ceb6b6b29b8445665f23943.png)