Disable Scantronics Alarm while replacing electricity meter?

Hi

I have a Scantronics 1927 Style user panel and a 9448+ Style control unit.

I'm having a new electricity meter fixed and would like to be able to disable the alarm while this is happening.

I think that the alarm and/or tamper alarm will activate when the electricity supply is disconnected. I want to disable this while the engineer is working on it.

Does anyone have any advice how to achieve this please?

Thanks :)