Hello:
I recently purchased a Siglent SDG1020 works properly.
I have considered installing a high stability oscillator, but I have not found information about it, would appreciate information about this change.
Greetings.
I'm not common Siglent technical support. Also my answer may be obsolete because it have been long time after I ask this question from factory.
You have three choices.
1. Use external house reference (connected to 10MHz ref input).
2. Install High stability oscillator (example TCXO or OCXO) to main board. There is place for it. I do not have detailed information for this. But long time ago I ask it from Siglent and answer was that it also need special FW (what can get from Siglent).
This 3. is my own thinking and not even discussed with Siglent engineers.
3. Modify main board. Take factory installed oscillator out (or cut only trace and leave it on its place) and install example OCXO in. Inject its output to same 10MHz line where was original oscillator output. (voltage etc specs you find using simple measurement on the running unit.
All self made modifications delete warranty.
If I'm not distributor but I have my own Siglent for my own hobby or professional use. I will think this position 3. If I can not use external 10MHz reference due to what ever reasons. (example if it is used on the work travel or places where is not available 10MHz house standard line.)
Because, this mod also do not need special software and later possible FW upgrades are not problem in this case.
My opinion is that this mod (3.) is quite easy to do but I can not give details for this. (I have not anymore one "service and inspect" unit in my lab what I can use for experimentation.
Inside unit need be careful, and also use normal lab practice about ESD protection.
If installl OCXO it need also care how much it draw current when it start from cold until it stabilize and then, many times they need minutes to half hour to stabilize even first level but reach final stability much much later (retract and ageing curve).
Today good quality TCXO's may be very good and may be even better than normal middle and even high grade OCXO until go to "State of art" level then OCXO show who is leader but TCXO's are going better and better so, who knows...
If look example Siglent SDG5000 it have far better internal reference inside. (here in forum you can find also tiny test about it)
It depends what are accuracy needs.