Hi Michael

Thanks for your reply.

I did indeed read it which made me realise the issue is what WeeWx is 
receiving (in relation to what its displaying on the webpage) & that it 
needs to be calibrated somewhere.
I will first calibrate the hardware & then check what value from the 
hardware is being displayed on the webpage. I'm pretty certain at the 
moment Relative Pressure from hardware = Barometer on the webpage but will 
double check so I know in future.

Thanks again,

On Monday 21 October 2024 at 04:56:31 UTC+1 [email protected] wrote:

> Hello, as a first step, did you read the following:
> https://weewx.com/docs/5.1/usersguide/troubleshooting/meteo/
>
> After that, do you know the pressure mappings console <=> weewx? Then, 
> which of the values (pressure, altimeter, barometer) is displayed on the 
> webpage? If you know all these things, calibrate your hardware according to 
> the manual and choose your desired obs_type to be displayed on the webpage.
>
>
> Ashley Hinton schrieb am Sonntag, 20. Oktober 2024 um 22:08:57 UTC+2:
>
>> Hello
>>
>> I've noticed my Barometer reading is different from other local sources: 
>> the airfield just up the road from me, the local weather report, my phone 
>> weather app - you name it, my readings did not agree. WeeWx was reporting 
>> too high.
>>
>> I'm using an Aercus IP weather station and WeeWx is using the Interceptor 
>> driver.
>> The weather station itself has its own calibration settings page, it has 
>> two fields for calibrating pressure:
>>
>> Absolute Pressure (was, and is, set to 0)
>> Relative Pressure (was set to 30.00hpa which I'm sure was arbitrary, now 
>> set to 0)
>>
>> If I change the Relative Pressure offset the Barometer value reported on 
>> the resulting WeeWx-generated webpage changes, so I'm confident that 
>> Relative Pressure is what's sent to WeeWx.
>>
>> My question is what to do - calculate and set the calibration in 
>> hardware, or in WeeWx? What is generally preferred or considered the best 
>> option?
>>
>> Thanks!
>>
>>

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