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Tek p5205 HV differential probe teardown. BTW, what are the red and brown wires?

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free_electron:

--- Quote from: 128er on November 17, 2014, 08:02:30 pm ---
--- Quote from: onlooker on November 17, 2014, 03:40:15 am --- 2). The P5205 was speced to use +/-15.0V power. Will a +/-10.5V supply be adequate?

--- End quote ---

Can't remember which parts of the circuit use the +/- 15V. But IIRC the +/- 15V input is directly followed by two adjustable linear regulator, one for +5V and the other for -5V. And they power most of the probe circuit. Have to look in one of my probes.


--- Quote from: David Hess on November 17, 2014, 03:53:19 am ---Was the differential probe terminated into 50 ohms on the oscilloscope?

--- End quote ---

Don't know if the OWON is capable of 50 Ohm termination. But the probes are specified for 1 MOhm input impedance.



But it is nice to see that the thread is not dead. I have worked a little bit on my Tekprobe PSU at the last weekend.

I like Onlookers idea. It is more like a stand alone solution, instead of my brick like Tektronix 1103 clone  ;D

A few pictures of my PSU . . .

--- End quote ---
that's a nice metal box. who makes that ? i like the punched noches to slide the board in.

schematic of the supply ?

i am sitting on a bunch of 6247 diff probes and their active counterparts but no 1103. and 300$ is too expensive for that stupid thing.

By the way, these probes are not made by Tektronix. Tek installs their own pigtail on it. The probe itself is made by Pintek. it is sold under many brand names. Agilent , fluke Tek , BK precision : they all have this probe in one form or another , all made by Pintek.
Same goes for all those current probes out there. only tek has their own. almost any other brands are rebadged hioki's.
Agilent scope probes are made by PMK in germany ( only the old infinium probes were an in-house job )

David Hess:
I forgot about the description of the original coaxial cable and compensation box.

What kind of cable was used on the input side?

128er:

--- Quote from: free_electron on November 18, 2014, 03:36:57 pm ---that's a nice metal box. who makes that ? i like the punched noches to slide the board in.

--- End quote ---

Bought that case here: http://www.eibtron.com/epages/eibtron.sf/en_GB/?ObjectPath=/Shops/eibtron/Products/754-5979

Also available on RS: http://de.rs-online.com/web/p/gefahrstoffschranke/7545979/

I don't know who the original manufacturer is. Top, bottom and side covers are steel. Front an rear panels are aluminium.


--- Quote from: free_electron on November 18, 2014, 03:36:57 pm ---schematic of the supply ?

--- End quote ---

Is attached.

JP1-6 are header connectors for LED's. Two indicates that the +/- 15V are present. And two for each channel to show the attenuation factor for the channel.

Didn't heard of PMK electronics before. For those who are interested: www.pmk.de/en/

MarkL:
That's a really nice job on the power supply.

All you need to do now is add the offset controls and, with a reasonable price, you could clean up selling them as Tek 1103 replacements.

onlooker:
For those interested, currently on Ebay there is this 4 P5210 for $100+shipping BIN.

http://www.ebay.com/itm/Lot-of-3-Tektronix-P5210-High-Voltage-Differential-Probes-1-EA-Tektronix-P5200-/151481910071?pt=LH_DefaultDomain_0&hash=item2345068337

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