i think its the camera because it only hums at night---------------that would sugest D/N camera BUT its not, its mono.......so as light levels drop it starts to hum cant be psu (hum constantly) the ramp-amp on the auto iris lens

like stuart says, change the camera/lens and see if the hum follows camera check/change lens just to Eliminate it

Right

After a long chain of trying to work out what the problem is...

-drum role-

It was the dam camera!

So i replaced the camera (and the others the same on site) and all is fine and dandy!

But as i was up the ladder on one of the cameras some of the screws that hold the tray which the camera is bolted too were all corroded, so i went to get my drill to put it on the high tork setting,

got the screws out... then dropped the drill :/ the whole front of it snapped and shattered off throwing small gears everywhere. so i now need a new drill!

Thanks for all the suggestions

Regards

alex

so i now need a new drill!

:lol:

:lol:

Yh i am using the very bulky Dewalt DC213KB (The big cordless SDS) with a SDS to keyless chuck adaptor.

Bloody heavy but its going to have to do until i can decide what to buy next.

Regards

alex

If the camera is 12vDC and it's powered from a Sanyo unregulated supply (the transformer), I'd be tempted to take the camera down and test it on a bench with a new power supply unit. It could well be a problem with the camera or the PSU, although I'm leaning away from it being an Earth Loop Hum (I'm not saying it definitely isn't, but that's dropping down my list of possibles).

If it is a 12v DC camera, you can easily isolate that from the housing to ensure it's not Earth Loop Hum, but my giblets are pulling me towards an age related (component issue) camera induced problem. It will be interesting to see what your tests throw up.

I too had humbars, and playing back the footage, at one point it reversed from going up to going down. It was a 1.2a PSU which had been working fine. I've got another cam using a 1.66a PSU and swapped it over, and the hum bars vanished, and the other cam was still working fine. However, the original cam now have these diagonal jaggies. They're not scrolling along though.

My question is: does this interference have any sort of technical name, and if so, what causes this?

I too had humbars, and playing back the footage, at one point it reversed from going up to going down. It was a 1.2a PSU which had been working fine. I've got another cam using a 1.66a PSU and swapped it over, and the hum bars vanished, and the other cam was still working fine. However, the original cam now have these diagonal jaggies. They're not scrolling along though.

My question is: does this interference have any sort of technical name, and if so, what causes this?

Possibly herringbone?

Right

After a long chain of trying to work out what the problem is...

-drum role-

It was the dam camera!

So i replaced the camera (and the others the same on site) and all is fine and dandy!

But as i was up the ladder on one of the cameras some of the screws that hold the tray which the camera is bolted too were all corroded, so i went to get my drill to put it on the high tork setting,

got the screws out... then dropped the drill :/ the whole front of it snapped and shattered off throwing small gears everywhere. so i now need a new drill!

Thanks for all the suggestions

Regards

alex

yep, thats what would happen to me too only worce if that was me then include the following the drill would have hit the floor and the drill-bit would have shot out like a bullet---and gone straight through the window and as the glass fell to the floor, it would cut/Injure a person walking past the person that got cut/injured would then sue the F.... out of me

so the morel of the storie is: you might have dropped a drill alex but just say thank you to god that your not (ME)

Edited April 3, 200818 yr by ICEbear