Re: Siglent SDS800X HD Review & Demonstration Thread
joeqsmith on 11 May, 2024 18:23 in Test Equipment
Quote from: Performa01 on 08 May, 2024 17:58...The commonly agreed industry standard for the maximum acceptable input VSWR is 1.5:1, which is equivalent to 14 dB return loss. ...I've never heard of such a standard. Could you provide a reference? If you are making measurements, 1.5 seems really high. Looking at the manual for my LeCroy 7200, they spec the VSWR at 1.2, BW is 4GHz with a 125pSec transition for 50mV and up. Isolation is 60dB min at 1GHz. I recently looked at SJL's sampling scope and verified the port match. Quote from: SJL-Instruments on 13 Jan, 2024 03:00QuoteWasn't sure how good your port match is. Not the best, to be honest: -17 dB @ 3 GHz (although we don't characterize this on a per-unit basis).We have a design with better matching (-30 dB) at the cost of 2x noise floor. We opted for the lower-noise design, since you can get essentially the same results with a 6 dB attenuator (but not the other way around).Once you get up to 5GHz, the return loss is around -7 and you really need to add an attenuator to improve it.