LeCroy Connectors

[MilkmanCDN]

I'm looking for a place to source the two connectors pictured below.    I know you can pull them from adapters like the PP093, and that's where I got mine from to make the models shown.

Has anyone come across these in their travels?    If so, would you please PM me with a part number and/or place to purchase them?   I've got an idea for an active probe that I'm working on in my limited spare time.

[lukier]

I was looking at that too at some point.

While I couldn't find the exact parts I think it is possible to adapt similar connectors.

BNC like that:
https://www.ebay.com/itm/163450006079

and 2x3 2mm pitch (AFAIR) pin header, precision, maybe spring loaded if one has deeper pockets.

Those two connectors and some 3D printing and it might work for a custom made probe, not for repairing an old one though.

[Gribo]

Mill-max has 2mm pitch, 2 rows to solder cup connectors. https://www.mill-max.com/assets/pdfs/metric/019.7M.PDF

[MarkL]

If you're building your own active probe, have you figured out LeCroy's ProBus (I2C) protocol?  Or were you just looking to grab power from the connector?

[Mechatrommer]

that 6 pins will go into holes, so spring loaded pogos are not appropriate imho possibly not even fit in. if anything fail maybe you can get the square pin 2mm pitch like this... Pitch 2mm 2x40 Pin Right Angle Male Double Row Pin Header Strip but i'm not ordering that right angle header... i ordered 2mm Male 2x40 Pin Double Row Pin Header Strip the straight one because i have something else in mind... iirc was testing it they fit in the lecroy's round holes but if you are concern, then i found 2mm pitch round pin Gold Plated 2mm Pitch Male 40 Pin Straight Round Pin Header Strip i can cut them to size if the square pin cant do the job. i think they will fit in but never try, i'll know when they arrive. for the BNC if anything fail, my order just arrived.. BNC male plug solder PCB mount RF coxial converter connector cutting or removing the outer ring should get closer to what you want... but i'll use that for different project, for lecroy project, i ordered its female counterpart to RG174 cable, i'm building BMA to sma adapter with published 6 pins wplink/wavelink/pro-link whatever, even better than lecroy's original LPA-SMA which doesnt publish the pins ymmv...

[BobGeorge]

I have been hunting for these for a while as I want to make an PSU interface for the EEVBlog HV probes.

This is the closest I have found for the BNC, it is 75 Ohms though.
https://www.te.com/usa-en/product-6274360-1.html

<edit>
I spoke too soon, some more 50 ohm options here
https://octopart.com/search?q=push+on+bnc&start=0
<\edit>

The multi pin header os proving very challenging. Some from Harwin have too small pin diameter, I think the pins need to be 0.8mm diameter.
Some mill max bare pins may work.

[MilkmanCDN]

If you're building your own active probe, have you figured out LeCroy's ProBus (I2C) protocol?  Or were you just looking to grab power from the connector?

I plan on reverse engineering the I2C prototcol just enough so that my probe will enumerate as a CA10, or CP030/1    I also plan on using the +/-12V @ 250mA supply.   Ideally, I'd like to have the ability to make an add-on for XStream, such that I can control the probe from the scope interface, but after some preliminary digging around, I won't be able to get that tight integration.    That said, I'm surprised at how much access Lecroy's software does give you to the I2C bus. 

[ollopa]

You can use a 24C01/02/04/08/16/32 family I2C EEPROM and one of my attached EEPROM dumps.

For a custom current probe the CA10 is the way to go.  You can set your own name and offset/gain through the UI, then save it back to the EEPROM:

[ollopa]

Forgot to mention, use a 270 Ohm resistor between ground and the probe ring so that it will be detected as a "Bus" probe.

If you're looking at the ProBus connector on the scope that should be the top-right pin (ring) and the bottom-right pin (gnd).

[MilkmanCDN]

@ollopa,

I see you have tabs labelled C1Dev.

Are these specific to the CA10?    Can you sen a screenshot?

[ollopa]

No, those have nothing to do with CA10 or this topic.

[ollopa]

I started a thread here https://www.eevblog.com/forum/testgear/lecroy-probus-reverse-engineering/  that might be of interest to people watching this one.

I also did some experiments last night with the CA10 EEPROM on my WR6KA scope.  Unfortunately the scope firmware crashes on the WR6K and probably WR7K when a CA10 is installed.  These older scopes are not shown in the list of supported scopes on the CA10 web page.

[dmderev]

I programmed the EEPROM for AP020 and used a preprocessor that acknowledges all transactions. Here's what it turned out:
1. The quality of the contacts in the connector matters, poor contact leads to a transition to strange modes (a red bar “Processing ...” appears. When I realized this, the work became predictable. EEPROM address - 50h (all address inputs must be at zero)
2. The binary images on the Internet contain only the valid data. The default programmer leaves FF in an unused area. It confuses the firmware. All free memory must be filled with zeros.
3. The oscilloscope reads entire EEPROM sequentially, regardless of the size of the data block, in one pass. Then it recognizes the probe, and switches the input mode (in my case, DC coupling is turned on and 50 ohms is not turned on - perhaps the resistor in the probe, although in the picture you can see only the place for its installation.
4. When you rotate the offset knob, the oscilloscope sends the following commands to two PCF8574 port expanders - at addresses 0x23 (data port) and 0x21 (command port). First, the most significant byte of the offset is written to the data port (for positive numbers, the most significant bit = 1, for negative numbers = 0). Then bit 0x01 is set in the command port (latch new data in 74573), after that the bit is cleared (data remains in 74573) and then the low byte is written to the data port. Perhaps this leads to a small glitch at the DAC output, but they are OK with it.
5. If these transactions are not acknowledged, the oscilloscope makes 4-6 recording attempts and stops.
6. For example, 0x8000 = offset = 0, 0x7FFE = offset = -2mV, 0x8002 = offset = + 2mV. In this case, the DAC code is likely to scale, since for the sequence 1,2,3,4,5,6mV codes 0x8002,0x8004,0x8006, 0x8007, 0x8009, 0x800A. But I am not 100% positive in scaling.
7. When switching the vertical scale and if the offset is not zero, the oscilloscope sends the correspondingly changed offset - that is, on the 1mV range, the 10mV offset will be replaced by 50mV when switching to 5mV. If offset was zero, the transaction is not done as it stays zero.
8. Depending on the input mode, the command port bits have the following meaning - 0x10 - when set, the DC coupled input. 0x40 = when set, the input is AC coupled (on probes, is this?) When both bits are cleared, the input must be Grounded. That is, switching the mode and writing a new offset corresponds to 0x23 = MSB, 0x21 = 0x11, 0x21 = 0x10, 0x23 = LSB for DC coupled, 0x23 = MSB, 0x21 = 0x01, 0x21 = 0x00, 0x23 = LSB for GROUND, 0x23 = MSB, 0x21 = 0x41, 0x21 = 0x40, 0x23 = LSB for AC coupled. The relay may be switching Ground.
9. I did not find the purpose of the remaining bits in the control port, other buttons and knobs do not affect the samples.

So for the AP020 we have complete information on how to manage the probe. I will look at others at my leisure. Other bit settings may appear. It looks that WavePro960 recognizes newer probes (ZDxxx, ZSxxx) and lists their names, but does not send offset data to probes on I2C when offset is changed.