BNC 1420 - Video Microscope - Manual (Page 25)

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Video options menu
Click on the video capture card that you want to use. Select the
appropriate capture source.
Make sure that either the BNC composite or S-Video connector output of
the Model 1420 is connected to an input of the Hauppauge card, and select
the relevant input connector through the Input connector box. Click
View>Video options>Input connector and select the input that you want
(e.g. Input: 0: Video SVideo In, Output: 0: Video Decoder Out). Click OK.
At this point you should see live video on your screen.