| Products > Test Equipment |
| Tek p5205 HV differential probe teardown. BTW, what are the red and brown wires? |
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| onlooker:
I did more tests to determine the power supply requirements. These were done by measuring the signal amplitude reading on the output of 5205, as a function of the power supply voltage. 1). Power supply dependency of bandwidth: A sine signal of 100MHz and Vpp of a couple volts was connected to the input of the 5205. For supply changing from 15.0V to 9.0V, the signal output stayed flat at about 2.6V. When supply further reduced to 8.0V, the signal output was dropped to 2.45V, or a 0.5dB attenuation. 2). Power supply dependency of signal clamping: For this test, the mains voltage with its voltage range of +/-170V was applied to the input and the 5205 was set to the 50X setting which has a speced voltage range of +/-130V. The waveform amplitude and shape stayed the same for the supply varying from 15V to 10V. When the supply further dropped to 9.0V, the output voltage clamped about 7% and other artifacts started to show up at the peaks of the waveform . Considering that 170V was a ~30% over range signal, I would guess an in-range signal should not show clamping for a supply of about 9V. Based on these tests, I think a supply voltage between 10V (or 9V) to 15V should work fine. |
| free_electron:
http://www.chevalgrp.com/sa_series.php thats the cases |
| 128er:
Hi all! Just wanted to show you my finished PSU for the P5205 differential probes that I have. It works fine. :-+ The labeling is made with self adhesive letters. Sticks quite well. The LED's seems a bit dim, but that is due to the camera flash. The brightnes is good. Not too bright, so that it is irritating on the bench. The BNC connectors are okay. I had prefered some sort of front panel BNC's with crimp connection. Or one of those front panel BNC's with a plug on the rear side (couldn't find a picture at the moment). But none of my usual suppliers had them (for a reasonable price). But all in all I'm quite happy with the thing. The last thing left to do, is to properly connect alle enclosure parts with the PE. And maybe change the screws on the front panel, to some nice looking round head with hex socket. Thanks to all who had replied to this thread and gave some good infos. |
| Fluxed Matter:
Just picked up the P5205 for cheap off fleabay and it arrived yesterday and have a couple of questions. The first thing is how do you remove the enclosure and get at the pcb? Been trying to figure it out without destroying the case. Do you just pry it open? Love the power supply 128er! Do you have the image for the probe board available? I would like to etch one up for the PS I will build. I picked the probe up and it has a few calibations stickers on it from '08 but someone wrote bad in permanent marker on both sides. It came complete with cables and connectors on both ends. Hoping to get this working because I been wanting a probe for power supply work. |
| onlooker:
The case was fastened with four screws. You can access the screws by lifting the top plastic sticky sheet cover. You need only to lift it at each corner just enough to see the screw well. A sharp knife can be used to do the initial lifting. |
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