Very low SUM signal

msouier posted on Sun, Jan 17 2016 10:47 AM

rated by 0 users

Dear All,

what are the reason of low laser sum signal apart from bad tip coating ?

an MFM tip was used and the sum signal was around 3V.

Now the signal on the similar MFM tip can be at maximum 0.04V !! while we can see the laser spot on tip using the video.

Also, if we rotate the back lever to tilt the mirror, can we see the movement of the mirror ? In our case we don't see any visible movement.

We are using MM8.

Regards,