Deskew fixture - Page 1
Forum section: electronics / testgear

author: chilternview
author_rank: Frequent Contributor
timestamp: July 05, 2025, 06:22:01 am
content: Are deskew fixtures interoperable between scopes? In other words can I use a Siglent one on a Keysight scope?It's not clear to me if they are controlled by the scope (and hence may be specific to that model) or the USB connection is just for power, and they all produce low skew magnetic and electrical pulses.

author: electr_peter
author_rank: Unknown
timestamp: July 05, 2025, 07:32:45 am
content: In general deskew fixture can be used with any scope, USB is just for power.Deskew fixture generates sharp current and voltage pulses to align voltage and current probes on oscilloscope.It is like "probe calibration" port on typical scope, nothing special about it.

author: tautech
author_rank: Super Contributor
timestamp: July 05, 2025, 07:33:20 am
content: Quote from: chilternview on July 05, 2025, 06:22:01 amDeskew fixtures like Siglent DF2001A just use USB for power supply therefore you can use it with any 5V USB supply.DF2001A provides fast voltageandcurrent edges @~22kHz, a approx traditional frequency used in SMPS.With close alignment of the edges, normally near the trigger level the skew due to different signal propagation times of voltage vs current probes can be almost perfectly aligned to allow for accurate calcs in the modern DSO's Power Analysis feature.A deskew fixture with a known current pulse also provides the advantage of getting a current probe set correctly to provide accurate results.Various links and discussion:https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg3137612/#msg3137612https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg3142106/#msg3142106Led to this:https://www.eevblog.com/forum/testgear/scope-probe-deskew-fixture-pcb-project/

author: chilternview
author_rank: Frequent Contributor
timestamp: July 05, 2025, 04:51:01 pm
content: Brilliant, thanks guys.

author: chilternview
author_rank: Frequent Contributor
timestamp: July 10, 2025, 06:38:39 pm
content: Tautech, do Siglent have a problem supplying their distributors with the DF2001A ?Telonic in the UK don't seem to be able to say when they can get one from Siglent.

author: tautech
author_rank: Super Contributor
timestamp: July 10, 2025, 08:32:52 pm
content: Quote from: chilternview on July 10, 2025, 06:38:39 pmEU branch in Germany whom supply Telonic might not have stock.Best you pop them a message:https://www.siglenteu.com/contact-us/

author: Martin72
author_rank: Super Contributor
timestamp: July 10, 2025, 08:51:55 pm
content: Hi,Batronix has the boardin stock, I would ask for a quote...

author: chilternview
author_rank: Frequent Contributor
timestamp: July 10, 2025, 09:07:50 pm
content: Thanks Martin, it may come to that. But as per Tautech's suggestion I've msgd Siglent EU.

author: Martin72
author_rank: Super Contributor
timestamp: July 10, 2025, 09:20:57 pm
content: You won't get one from them directly.

author: chilternview
author_rank: Frequent Contributor
timestamp: July 10, 2025, 09:39:01 pm
content: Quote from: Martin72 on July 10, 2025, 09:20:57 pmNo I know, but Telonic said at the beginning of this week that they would have to order one from Siglent, who said they had them in stock, so a kick up the ass might just help. Why is it so difficult to buy stuff from some suppliers?

author: tautech
author_rank: Super Contributor
timestamp: July 10, 2025, 09:44:08 pm
content: Quote from: chilternview on July 10, 2025, 09:39:01 pmDF2001A is not a fast moving item so Telonic may choose not to stock them and only get them in to order.I can say it's annoying when you get an order for product just after you've placed your regular stock order....

author: Martin72
author_rank: Super Contributor
timestamp: July 10, 2025, 09:56:57 pm
content: Quote from: chilternview on July 10, 2025, 09:39:01 pmI bought my DF2001 from Siglenteu, which is a dealer, not Siglent itself.They were clever and didn't even indicate whether it was in stock or not.So I waited weeks for delivery.It reminded me of the dark days of the 2000s, when internet retailers were springing up like mushrooms, with no stock, just collecting orders and then ordering themselves.