Do you really need analog scope for SRS SR620 graphics display mode to work? - Page 1
Forum section: electronics / general

author: notfaded1
author_rank: Frequent Contributor
timestamp: June 29, 2020, 06:34:04 pm
content: I tried X-Y mode graphical display mode with my SR620 on my little Siglent SDS1202X-E and it works... sorta. You can see the graphics but they're faint and lines don't look clean. Does this work on better digital scopes or do you really need a true analog scope for the X-Y graphics on the SR620?Bill

author: bdunham7
author_rank: Super Contributor
timestamp: June 29, 2020, 07:05:34 pm
content: XY sucks on these scopes, I haven't seen a good XY display on a DSO, but I haven't seen them all. However, it should work at least workably decently if you set it up correctly. What you need to know is that XY on these scopes still uses a trigger and acquisition period.Try changing these:1) Horizontal sweep rate--turn counterclockwise one step at a time2) Trigger--try CH2 and LINE, see what they do3) Adjusting persistence, if this is a steady-state or slow-moving display.

author: maginnovision
author_rank: Super Contributor
timestamp: June 29, 2020, 07:30:54 pm
content: I've also found that if you can set the timebase to have slightly over 1 full frame works best but if it's bad you will want 3-5 to "thicken" the traces. You shouldn't need any persistence.

author: notfaded1
author_rank: Frequent Contributor
timestamp: June 30, 2020, 12:56:28 pm
content: Thanks guys... it helps to know it's not just me seeing this. I'll try some suggestions. I may just have to fire up a really old HP 1200 series dual trace I have that's doesn't even have regular probe connectors... only banana jacks! Might be worth a try right? See attachment for how old this things is... maybe I've got a new use for it!Bill

author: TimFox
author_rank: Super Contributor
timestamp: June 30, 2020, 02:25:06 pm
content: I have an -hp- 1200B dual-trace differential input rack-mount CRO that is my go-to scope for analog work. It is a perfect XY display within its 500 kHz bandwidth (50 kHz with low-pass filter engaged). Note that the input capacitance is too high for almost all scope probes.

author: notfaded1
author_rank: Frequent Contributor
timestamp: June 30, 2020, 02:47:36 pm
content: Quote from: TimFox on June 30, 2020, 02:25:06 pmThanks TimFox... I think this may have promise then!

author: maginnovision
author_rank: Super Contributor
timestamp: July 01, 2020, 03:57:58 pm
content: I used to have a 475A I kept around just for X-Y stuff but the R&S scopes seem decent enough that I gave it away. An analog scope is definitely a cheap way to make sure you have the capability when you need it.

author: DaJMasta
author_rank: Super Contributor
timestamp: July 03, 2020, 04:59:28 am
content: Haven't done XY on a Siglent scope in a bit, but I've found on my Rigol that playing with the timebase/memory depth/display options and usually get a passable signal.If you're just using it as a monitor, there's also the option to use a vectorscope or other x-y display with no ranging or whatnot like a standard scope has.

author: james_s
author_rank: Super Contributor
timestamp: July 03, 2020, 05:12:00 am
content: XY mode is the main reason other than nostalgia that I still keep my Tek 465B. In every other way a DSO blows away the analog instrument but for XY analog is king.