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| Suggestions for a good second-hand LA? |
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| mbalmer:
--- Quote from: nctnico on September 14, 2022, 06:02:52 pm ---IMHO the TLA715 is a much better buy because you can swap (upgrade) the modules. I do have to say though that whatever you run the software on, it is going to be slow so having a 'fast' processor in the logic analyser itself or your remote control PC isn't going to help. For some reason Tektronix wrote the software in a very clumsy way that doesn't fully utilise the processor at all. An SSD is the most worthwhile performance update. --- End quote --- Fair enough -- as I mentioned, I think at this point, the HP is pretty much out of the running simply due to how many failures I've had with it. The 16702B has the scope board, one lonely working LA module (with the runners removed cleanly, so there's no hope of them corroding in the future) and six more that are in various states of failure. If I can get two or even three of the boards working, then I might turn around and re-sell the LA, but for right now, it's an interesting repair project. The TLA will be the actual analyzer I use when it gets here -- once I can get the probe adapter boards made. |
| RomDump:
--- Quote from: mbalmer on September 15, 2022, 03:03:02 pm --- The TLA will be the actual analyzer I use when it gets here -- once I can get the probe adapter boards made. --- End quote --- btw: With the TLA715 you have options instead of making the probe adapter board. You can buy a TLA7P4 module and P6417/P6418 probes. Most people just bought the TLA7AA4 and P6860 probes because it was widely available. |
| nctnico:
I strongly recommend going for the P6417 as these have better contacts compared to the P6418. If you go that route... The advantage of the TLA7AA4 module besides even more memory and higher samplerates are the 4 analog outputs that output any of the input signals. It is super handy to be able to connect an oscilloscope and use the logic analyser as an analog mux / buffer to look at various signals. That way you have a mixed signal analysis tool. IIRC the analog bandwidth is >1 GHz. |
| mbalmer:
--- Quote from: RomDump on September 15, 2022, 05:33:31 pm ---btw: With the TLA715 you have options instead of making the probe adapter board. You can buy a TLA7P4 module and P6417/P6418 probes. Most people just bought the TLA7AA4 and P6860 probes because it was widely available. --- End quote --- Yeah, that's basically what I did. The 715 is going to come with a 7AA4 installed in it, and I could find P6860s for about $15 each -- and also because supposedly, the 7AA4s are up-hackable in a rather dramatic fashion. Now my goal is to just get my hands on either the schematic for the probe adapters, or the footprint for the probe heads, so I can instead design an adapter to an HP flying lead set instead -- since I've got something like 12 of them now. --- Quote from: nctnico on September 15, 2022, 06:40:38 pm ---I strongly recommend going for the P6417 as these have better contacts compared to the P6418. If you go that route... --- End quote --- I went the P6860 route. --- Quote from: nctnico on September 15, 2022, 06:40:38 pm ---The advantage of the TLA7AA4 module besides even more memory and higher samplerates are the 4 analog outputs that output any of the input signals. It is super handy to be able to connect an oscilloscope and use the logic analyser as an analog mux / buffer to look at various signals. That way you have a mixed signal analysis tool. IIRC the analog bandwidth is >1 GHz. --- End quote --- Doesn't that functionality require a compatible scope? I remember reading that there were certain scopes that were "supported" but I don't own one (I have a TDS 460, which isn't on their list). I'm guessing this is a BNC output on the LA that goes to an input on the scope. |
| nctnico:
There is some software / hardware tool to support cross-triggering between Tektronix scopes and their logic analysers. But I don't really see the need for that. You can use the trigger input / output on the logic analyser just fine to make it work together with an oscilloscope from any brand. The analog outputs on the TLA7AA4 module are just analog outputs; it doesn't matter what you connect it to. IIRC even the gain is adjustable. The footprint for the probe heads is in the P6860 user manual |
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