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Tek p5205 HV differential probe teardown. BTW, what are the red and brown wires?
Shock:
I have a Tek P5205 and I'm thinking about converting it for an analog 100MHz scope with 1MR input.
Is the general consensus?
Blue +15V
Black -15V
Brown won't be used in my situation
Red is the zero compensation for low voltage measurements.
Since I don't have the power supply for it I was thinking of just of mounting a DC socket and the 10K zero compensation pot at the LV end of the probe which will need some new holes made.
Is there any potential pitfalls anyone can see in doing this, will the power need shielding or twisting or interfere with the LV signal? It's got to be better than running it up to the scope, right?
128er:
--- Quote from: Shock on May 02, 2015, 07:36:32 pm ---I have a Tek P5205 and I'm thinking about converting it for an analog 100MHz scope with 1MR input.
Is the general consensus?
Blue +15V
Black -15V
Brown won't be used in my situation
Red is the zero compensation for low voltage measurements.
--- End quote ---
Yes!
--- Quote from: Shock on May 02, 2015, 07:36:32 pm ---Since I don't have the power supply for it I was thinking of just of mounting a DC socket and the 10K zero compensation pot at the LV end of the probe which will need some new holes made.
--- End quote ---
You mean, fitting a DC socket and the 10k pot in the probe case? Why not. But the probe needs symmetrical +/- 15V. Or do you want to mount two DC sockets? I am not able to understand it at the moment :D
Shock:
I was thinking about drilling a hole for the DC supply (3 pin socket for +15V, -15V and GND). The DC supplies GND pin (not mains earthed referenced at the supply itself) then connects to the LV signal cables coax GND on the PCB (which is mains earth referenced at the scope). Then for the zero compensation put a 10K pot across the 15V rails and connect the Red to the wiper. Is that correct?
EvanShultz:
Cheers! First post!
Hi Shock, yes that's the correct connections based on the schematic posted earlier. It should work fine.
I just finished tracing the circuitry in the big probe box. I need to simulate a few things to make sure it all works, and I want to confirm the circuitry in the small box that goes into the scope, but so far it all looks correct and makes sense. Stay tuned...
abulafia:
Hi guys,
Just for the interested parties here is R/E schematics from a P5205 (non A).
Also to answer the buttons question, they are almost identical to Digikey item https://www.digikey.com/product-detail/en/c-k/PVA1EEH11.2NV2/401-1132-ND/417713 (same manufacturer)
Best regards,
Bogdan
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