• RE: Brief differences between P77STFLXA and P77STFLXB and also details of P75LRST probe tip

    <p>Hello!</p> <p></p> <p>I believe I can be of assistance here since you've been left without a reply for a few months now.</p> <p></p> <p>I'm going to assume you wanted to know about the P75<strong>T</strong>LRST as there's no P75LRST variant. The P75TLRST is capable of 20GHz bandwidth (which depends on the probe you're using) and there is a P75PST performance tip that is advertised up to 30GHz of bandwidth at the cost of being shorter than the P75LRST probe tips. I'm guessing these are able to operate from 0C to 40C, similar to the probe's operating range. if you want higher temperature, you'll need to switch to the high-temperature tip which can go from -55C to 150C (assuming you keep the probe properly heated/cooled (depending on environment)).</p> <p></p> <p>The P77STFLXA is a flex probe tip with 175 Ohm resistors placed at the tip. Excellent for mid-bus probing and anywhere else you feel like you want to probe some signals.</p> <p></p> <p>The P77STFLXB is a flex probe tip with 75 Ohm resistors placed at the tip and is designed for use with the Nexus Technology interposers that have an embedded 100 Ohm resistance on each line (hence the 100 Ohm difference between probe tips.</p> <p></p> <p>NOW I must stress this: the P75LRST is NOT compatible with the P7700 series probes that the P77STFLX A and B variants use.</p> <p></p> <p>I've used both probes and feel like the P7500 is MUCH better for the end user as it offers a LOT more forgiveness when it comes to placing and attaching probes, especially around a DRAM interposer (I lost two interposers because the pads were ripped off when I was installing the P77STFLXB probe tip into the P7716 probe). I've done a LOT to secure these probe tips, but only so much can be done before you ask &quot;what flexibility does this actually offer? Is it flexible in the sense you can 'shape' the probe tip without breaking it because it certainly isn't forgiving to motion.&quot;</p> <p></p> <p>Another wonderful thing that the P7500/P75LRST offers is a SMALLER footprint that the P7700 series probe tips take up. The P77STFLXA/B is 6.35mm wide while the P75TLRST is only 5.08mm. This is a BIG problem when you're using the Nexus Technology interposer OR probing tighter spaces or when probe tips must overlap if multiple signals are probed in the same area.</p> <p></p> <p>I don't know what to tell you about the datasheet availability, but you can check out https://download.tek.com/datasheet/P7500-Series-Datasheet-14.pdf for additional details!</p>
  • RE: DDRA burst detection using Logic Channels

    Does anyone at Tek have anything I could try?
  • DDRA burst detection using Logic Channels

    Hello!<br> <br> I'm currently using a MSO72304DX oscilloscope with four P7516 probes plugged into the analog inputs with a P6717A plugged into the logic channels and hope to use all of this within the DDR Analysis software. When I have the P7516 probes and the P6717A probes hooked up to my Nexus Technology interposer (XH-Series), something will cause my DDR4 to fail memory training, but if I remove the P6717A probes from my UUT, I'm able to get the DDR4 to pass memory training. I'm assuming the 1meter length of the P6717A is the issue, but I was curious how anyone else was able to get around this issue. I've tried this combination on custom UUTs and CRB/Dev setups we are sent by larger manufacturers with similar results (memory training will fail when P6717As are utilized).<br> <br> Has anyone else been able to get around this issue? I was told by a Tektronix Sales Rep and this was also confirmed by a Tektronix Field Engineer that using the digital logic bus is the best way for read/write burst detection.<br> <br> Thank you!
  • RE: Known Bug

    Afonso,<br> <br> Thank you for that clarification :)
  • RE: Known Bug

    Afonso,<br> <br> Is there documentation that I can reference for this issue?
  • Known Bug

    Hello,<br> <br> I seem to remember coming across an announcement or a readme containing information about a known bug with the P7700 series probes where it was either an issue with gathering S-Parameters from either the probe or the probe tip in the event of momentary power loss OR inserting a probe into the oscilloscope while a probe tip was installed caused some issue. Is this still an issue or am I completely misremembering something? If it was or still is an issue, please share any details that you know of!<br> <br> Thanks!