Power module voltage fluctuation

I'm setting up my new Skywalker with APM2.5 and power module. All work fine but I notice the voltage reading in the HUD is fluctuating within about 0.5 volt. It will not stay in one reading even though I didn't move anythings. The current also show 1 A with nothing moving. 

Is there any calibration to be done ? I've used attopilot with great success but this module seems not working well for me.

Thanks for any feed back.

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David Hori liked Isabella Domi's profile
Jan 12