Products > Test Equipment
LeCroy Probus reverse engineering
MilkmanCDN:
FYI, If anyone is looking for replacement accessories case used in almost all of Lecroys active probes, you can get them here:
- https://www.amazon.com/Plano-Small-Sided-Tackle-Box/dp/B0000BY57W
ollopa:
--- Quote from: Mechatrommer on February 06, 2019, 12:15:02 pm ---i think an "adapter" like PP090 wont have cal data, the coax cable will just run straight through from input to output, so transfer function should be... 1?
--- End quote ---
No, definitely not. There will be an impedance matching circuit of some sort. For a wide frequency range and flat response it would likely be a matching pad rather than a tuned circuit or transformer, but I don't know the specs of the PP090 offhand. In any case with a divide-by-two attenuation attribute the transfer function is definitely not 1. :)
--- Quote from: Mechatrommer ---i'm interested to see eeprom comparison of active probes like AP020 and AP034. there should be some interesting data thats unique to each probe? i'm thinking to do this kind of work but i cant get to this yet, since i'm locked with other stuffs my desk piled up with things.
--- End quote ---
Yes please post anything you can. I've compared a couple sets of probes and so far nothing significant has been different.
--- Quote from: Mechatrommer ---i ar wun aint no have an PP090 :-// i think its tv84 who provided it..
--- End quote ---
Oops, sorry to you and MilkmanCDN both. And thanks MilkmanCDN!
Mechatrommer:
--- Quote from: MilkmanCDN on February 06, 2019, 03:34:33 pm ---FYI, If anyone is looking for replacement accessories case used in almost all of Lecroys active probes, you can get them here:
- https://www.amazon.com/Plano-Small-Sided-Tackle-Box/dp/B0000BY57W
--- End quote ---
there are also a few in ebay...
https://www.ebay.com.my/itm/Plano-Small-2-Sided-Tackle-Box/282622389504?hash=item41cd9b6d00:g:5EkAAOSwfRdZK9D6:rk:2:pf:0
https://www.ebay.com.my/itm/Plano-Small-2-Sided-Tackle-Box/141990494258?hash=item210f4b0032:g:BvcAAOSw8vZXNILk:rk:1:pf:0
i have that came with D500PT and soft carrying bag. its good because its compact 2 sided, but i'm not fan we have to flip over to get to the other side, the parts inside the other side will fall to the lid under. so for sensitive parts we need to brace with foam or something top and bottom. for my case, it came only to store some clips, mini pins inside a mini plastic bottle, and the lecroy stripline test circuit i guess for calibration or skew testing i dont know. the case not even fit in the probe 2 legged stand and probe's head clip, useless. i have to get another box for them later.
--- Quote from: ollopa on February 06, 2019, 04:33:09 pm ---
--- Quote from: Mechatrommer ---i'm interested to see eeprom comparison of active probes like AP020 and AP034. there should be some interesting data thats unique to each probe? i'm thinking to do this kind of work but i cant get to this yet, since i'm locked with other stuffs my desk piled up with things.
--- End quote ---
Yes please post anything you can. I've compared a couple sets of probes and so far nothing significant has been different.
--- End quote ---
let see what i can do..
--- Quote from: MilkmanCDN on February 05, 2019, 11:54:56 pm ---
--- Quote ---now where did you get that schematics?
--- End quote ---
Yep, they're readily available from various online sources. Here's a schematic snippet from an older WaveRunner front-end. Same thing.
--- End quote ---
in your linked schematics, the resistor to pin 5,4,3 is 33 and 22 ohm instead of 100 ohm in dda5005 and sda6000 wavelink interface (wavemaster series). just to let you people know, and i guess it wont make much difference. i think the voltage divider logic provided by ollopa still applies, if not then we have to redo the test again. attached are pcb for the probe's interface on 5005 and 6000.
and while at it, the rest of the attachment shows whats inside a D13000PS diff probe body. there is no 24C02 (eeprom) chip that i can spot, only a hobby grade pic16f872 chip. some sellers sell this body at insane price they dont know the most expensive is the probe head, this probe body is just interfacing platform any hobby can build at few cents of price, they are crazy. these probe's body (both D13000PS and WL600) can accept D500PT head and i suspect also applies for other compatible head like D600AT-T, D350PT, D300PT et al. the DSO will show nothing when probe's body alone is connected, only shows probe's head ID when the head is connected to the body, so i guess there is also some eeprom chip inside those small probe head, that need some courage and risk to open up, thats where the real money is, we broke that we lose some $K of money. maybe we can just sniff pin 3,4,5 for safer hack.
imo hacking these differential probe is too much, they are specialized lower input impedance lower dynamic range probe. and the very high frequency BW is not easily replicated by hobby if the purpose is to make a 3rd party cheap compatible probe alternative. so maybe we can stick with more general purpose high impedance higher dynamic 1-2GHz probe like AP020 and AP034. i only provide it for food of thought maybe usefull for someone, fwiw...
JPortici:
yeah, the PIC is probably there to act as eeprom and probably to handle all the trimming inside the probe
wingel:
Has anyone managed to find a supplier that sells the edge mount BNC push-on connector or the 6 pin header? For testing one can make do with a normal BNC connector on a cable and a pin header, but it would be nice to be able to build something like that AP034 board.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version