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Old 3rd October 2018, 21:59   #11
macafee2
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Damn you all with your helpful answers. I was going to suggest hitting the transformer and seeing whether it changed into a car, boat or plane
lol
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Old 3rd October 2018, 22:04   #12
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I hope the cctv is not damaged, it was not cheap and so I don't want to reattach the power supply and risk it, I have ordered a psu.

I tested 48vdc and a silly amount of ac but neither were under load. I could not test amperage, when I tried I got a spark......quite a big one for such a small unit, made me jump.

psu should arrive Friday and i'll pray that this solves the problem

thank you for the advice

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Old 4th October 2018, 02:36   #13
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Originally Posted by macafee2 View Post
I hope the cctv is not damaged, it was not cheap and so I don't want to reattach the power supply and risk it, I have ordered a psu.

I tested 48vdc and a silly amount of ac but neither were under load. I could not test amperage, when I tried I got a spark......quite a big one for such a small unit, made me jump.

psu should arrive Friday and i'll pray that this solves the problem

thank you for the advice

macafee2
Before you fire it up with the new power supply, check the feeds to the cameras and make sure you have no shorts in the supply leads.
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Old 4th October 2018, 06:36   #14
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Yes and that tends to be the rule rather than the exception.


...............

That is certainly not the case. In fact, certainly not in this case as the OP measured a high spurious output.


Why would you not test with a simple, stable load as opposed to an unknown one in the form of the equipment that may or may not have been damaged?
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Old 4th October 2018, 10:05   #15
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That is certainly not the case. In fact, certainly not in this case as the OP measured a high spurious output.


Why would you not test with a simple, stable load as opposed to an unknown one in the form of the equipment that may or may not have been damaged?

Obviously not in this case, nor in many cases, as per my post. It would be on my bench, main unit being tested on a linear supply. Maybe my post was not as clear as it could have been as I would not expect a zero output off-load but I will not continue as to how I would continue as that is not really pertinant here. I assumed the OP had limited testing resources.
As I have no desire whatever to get into personal engineering practices my contribution to this thread is complete.
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Old 4th October 2018, 14:45   #16
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Obviously not in this case, nor in many cases, as per my post. It would be on my bench, main unit being tested on a linear supply. Maybe my post was not as clear as it could have been as I would not expect a zero output off-load but I will not continue as to how I would continue as that is not really pertinant here. I assumed the OP had limited testing resources.
As I have no desire whatever to get into personal engineering practices my contribution to this thread is complete.

Huh, what a strange response.

We can deduce that the OP has a voltmeter as he has already taken a voltage reading. The "best engineering practice" would be to place a simple resistive load on the PSU - a resistor - and retest. Then work out the next step. To build or procure a linear 48V PSU would not be good engineering practice. But I note that we are not going to debate engineering practices, so fine.

As we are being pedantic and touchy, your contribution is not complete. It may have ended but the two are not the same!

At the end of the day, it is for the OP to decide what he wants to do. All we can do is to give our inputs.
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Old 4th October 2018, 15:42   #17
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You cannot test a switching supply off-load. Doing so will only give you wildly out of range results if any at all. If you do get a reading it will normally far higher than you would expect. Testing on-load is the only way to accurately check for correct output.

I agree, besides which any high impedance digital test meter, as this meter is almost certain to be, will pick a great deal of noise from the PSU and measure that. It does absolutely need to be tested under load, to properly assess the results.



If there is no other easy way to check it when plugged into the loaded and it is a 2-core cable, I find an easy method to connect a meter, is to stick pins into the wire cores.
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Old 4th October 2018, 18:42   #18
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I've ordered a new psu and hope that solves the problem. cheaper then replacing the cctv.

I'm not very good with this sort of electrics, house wiring, easy.

Maplins have closed so no local place I can think off for a resistor, I guess RS spares on the net but I have no idea of what resistor to get

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Old 11th October 2018, 20:20   #19
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transformer arrived, really apprehensive plugging it in and turning it on.

The relief I felt when cctv burst into life. I wish I did not feel the need for cctv but an act of vandalism prompted its installation.
Alas it has been a worthwhile investment.
It has also caught an act of criminal damage but land owners did not want to press charges but it cleared our name, as landowners thought we had done it, that upset my wife.

Having drivers insurance pay for garden wall covered cost of cctv. Driver lied about how it happened, cctv helped win the day. Even with out it driver hitting a stationary garden wall and saying it was not his fault probably would not have been believed.


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Old 12th October 2018, 15:10   #20
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The relief I felt when cctv burst into life. I wish I did not feel the need for cctv but an act of vandalism prompted its installation.

macafee2

Well done!


I used to have CCTV, just to keep an eye on the front of the house and the kids out the front when they were young. It saves going to the window.


I kind of got used to the facility and when it came time to replace it, I installed a webcam, the wireless X,Y,Z motion type. Which means any computer on my LAN, can look at the cams image and steer it, watch for movement and record the movement from before the movement began. I use software called ISPY.



I don't bother recording, but its there if there should be a need to. Its primary use now is to watch for the postie, so I can ensure the dogs are in when he appears, or he passes us by. I watch him enter the street on the far side, watch his progress going past, then know he will be back down our side in around 15 or 20 minutes.
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