# OPC HDA in Perspective Power Chart

**URL:** <https://forum.inductiveautomation.com/t/opc-hda-in-perspective-power-chart/92415>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [June 26, 2024, 7:39pm UTC](https://forum.inductiveautomation.com/t/opc-hda-in-perspective-power-chart/92415 "2024-06-26T19:39:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mmunin](https://avatars.discourse-cdn.com/v4/letter/m/c0e974/32.png) [@mmunin](https://forum.inductiveautomation.com/u/mmunin)\
**Post date:** [June 26, 2024, 7:39pm UTC](https://forum.inductiveautomation.com/t/opc-hda-in-perspective-power-chart/92415/1 "2024-06-26T19:39:04Z")

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I have an OPC-HDA historical provider set up in Ignition. I can use `system.opchda.readRaw()` to get raw historical data out of my historian, but I would like to leverage the Perspective Power Chart component. Is there a way I can address a specific OPC-HDA item directly from Power Chart?

The historian is read-only so I can't just do what I would do normally and set the history provider of my OPC tags. `histprov:CygNet:/tag:{{OPC HDA SPECIFIC PATH}}` does not seeem to work.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/e/ce94ac5abda6f273ebc66f8a0c39e0c5b86265e6.png)

When I run system.opchda.getAggregates("CygNet") it returns `[]` so, PowerChart might just not be able to read the data "raw?"