# Troubleshooting: DanioVision

Issues

▪The quality of detection deteriorates with time

▪I cannot specify the white light fade duration in minutes and hours

▪There are spikes in the tracks

▪The DanioVision White light does not work when I skip some arenas

The quality of detection deteriorates with time

After a few trials, the subjects are no longer correctly detected. For example:

The issue likely occurs because of condensation on the Fresnel lens.

1.Set the anti-condensation mechanism to permanent On (see the DanioVision DVOC-0041 - Reference Manual for details). This bypasses the automatic control.

2.If condensation disappears after a while, the temperature sensor and/or the sensor circuit may be defective. If condensation remain, the glass heater may be defective. Contact Noldus Support for more information.

I cannot specify the white light fade duration in minutes and hours

Probably you have an experiment created with a previous version of EthoVision XT. There you can only select fade duration of the white light in seconds.

There are spikes in the tracks

See the topic Troubleshooting: Data acquisition > I see spikes in the track

The DanioVision White light does not work when I skip some arenas

Normally the White light device is associated with Arena 1 (A1 in most well plates). If you set that arena to To Skip, once you start the trial EthoVision XT does not send any command to the White light device because the corresponding arena is not active.

To solve this issue, do one of the following.

▪In the Trial List, set Arena 1 back to Planned. EthoVision XT collects data for all the planned arenas, including Arena 1. If you are not interested in the data of Arena 1, you can filter it out in the Data profile (Filter option).

▪In the Trial List, keep Arena 1 set to To Skip. Open the Arena Settings and in the Arena-Hardware Mapping window select No device allocated under Arena 1 and select White Light Stimulus under one of the arenas that you do not skip.

The second option is only available when your experiment does not contains tracks yet.