That power rail probe (RT-ZPR) looks very similar to the one Keysight is selling, even the SMA-to-1:1 probe browser looks exactly like the ones PMK make for Keysight.
I wonder if PMK makes those power rail probes?
Very nice to see there's a 4 GHz version in addition to the 2 GHz version offered by R&S.
Hi Neganur - the probe itself is designed by us, in-house. Some of the accessories might be sourced from a 3rd party (PMK would be likely). The ZPR has four big benefits:
1. Very low noise. Combine this with a RTM/RTA/RTE or RTO (which are all very low in noise too) and it's great, low noise solution for measuring power rails so the scope/probe doesn't eat in to your tolerance. Add to this full bandwidth at 1mV/div and up (most other scopes either BW limit or software zoom) and you can get a super accurate measurement of your DC power rail.
2. +/-60V of offset. It also has a built-in AC coupling mode (not available with Keysight). In general, I recommend you still use the integrated offset so you can see drift over time or droop.
3. High bandwidth with slow roll-off. The ZPR20 (2GHz) can see coupling of a 2.4GHz signal - the amplitude won't be accurate, but just knowing you have coupling is helpful. Same for the ZPR40 (4GHz) - it can see a 5GHz signal coupling in due to the Gaussian roll-off.
4. Integrated Probemeter - it's a high(er) precision voltmeter built-in to the probe (uses its own ADC). Very nice to quickly see the exact rail level so you can easily remove that offset.
It's not a probe for every measurement, but if you have to accurately measure your DC power rail, it is tough to beat.
-Rich