# How do you make a Meta Event Alarm? I have an issue with Activity Sensor false alarms

**URL:** <https://community.mobotix.com/t/how-do-you-make-a-meta-event-alarm-i-have-an-issue-with-activity-sensor-false-alarms/3169>\
**Category:** Event Settings\
**Created:** [October 1, 2020, 5:24pm UTC](https://community.mobotix.com/t/how-do-you-make-a-meta-event-alarm-i-have-an-issue-with-activity-sensor-false-alarms/3169 "2020-10-01T17:24:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Edward1](https://avatars.discourse-cdn.com/v4/letter/e/2acd7d/32.png) [@Edward1](https://community.mobotix.com/u/Edward1)\
**Post date:** [October 1, 2020, 5:24pm UTC](https://community.mobotix.com/t/how-do-you-make-a-meta-event-alarm-i-have-an-issue-with-activity-sensor-false-alarms/3169/1 "2020-10-01T17:24:47Z")

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Hello,

I was getting a lot of false alarms when sunlight passed through the clouds. I then read on this forum that you can make reference windows and setup a logic / Meta Event to help.

You can read about this in the link below.

> [@How to avoid MxActivitySensor false alarms](https://community.mobotix.com/t/how-to-avoid-mxactivitysensor-false-alarms/248):
>
> MxActivitySensor is a really powerful tool to reliably detect motion but it’s not false-alarm free. Under specific circumstances, changes in the illumination can trigger events. For example the headlight of a car passing by or the shadow projected by the sun on moving clouds. Fortunately we can mitigate this issue by using other tools such as VM and, most importantly, VM reference windows. Below we explain the configuration principle with an example. To reduce false alarms on Activity Sensor…

I decided to make a Meta Event but the issue is when I make a meta event, I need to have the Activity or Video motion windows activated in Image Analysis.

For example to make this as simple to understand. Say I want to make a Meta Event that only triggers If Video motion box 1 and Video Motion box 2 are both activated at the same time.

I would have to create video motion box 1 and 2 and enable them in Image Analysis Events. This would cause the alarm to go off if either box 1 or box 2 is triggered.

In this example how would I make a Meta Alarm to have box 1 and box 2 to only trigger if both boxes are triggered at the same time?

Is it possible to make a Meta Event with VM and AS boxes, and have those boxes inactive in Image Analysis events?

Thanks