Perhaps someone could 'chime-in' with a screen shot from the Siglent 2104X Plus in X-Y mode with a spinning circle?
Nice video of a pre-release unit doing X-Y for you to download here:
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg2787208/#msg2787208
Interesting...
That was back in 2919
Any chance of getting a 2000x Plus and doing the following;-
Get a 10MHz Sine 500mv signal - out of the AWG on the 2000x and connect to CH1 on the 2000x
Get another 10MHz Sine 500mv signal - from another source and connect to CH2 on the 2000x
Then select X-Y mode on the 2000x
You should see a circle
If the circle is not moving - the two 10MHz frequency sources should be 'in sync'
Take a screen shot and post here
Thank You
Its probably unlikely that the circle is perfectly 'still' and not moving - because the respective independent 10Mhz clocks will be drifting.
If CH1 source is from a GPSDO - stabilized and locked to GPS signal - you should have (if you have a well disciplined clock) at least 10E-12 accuracy.
That's 0.000001Hz accuracy
Now you can use this 10MHz signal to calibrate all the other equipment in the lab
Get your other 10MHz signal - from the device being calibrated is connected and connect to CH2 on the 2000x
Put 2000x in X-Y mode
Circle will most likely be spinning.
Adjust the frequency on the source connected to CH2 (the device you are calibrating) - until the circle is virtually frozen i.e not moving.
Unfortunately the circle will still be moving very slightly.
Write down the frequency shown on the source connected to CH2
Note the last significant digit.
It should be at least 0.01Hz - if you have a good frequency source.
Now look at the circle and get a stop watch.
Start the stopwatch and time 'in seconds' - how long it takes for the circle to rotate 2 times.
The circle actually rotates 360 degrees - because we see it in 2D on the 2000x screen - we need to have 2 x 180 degree spins.
Write down the number of seconds and now divide 1 by the number of seconds.
Hopefully you will get a small fraction - something like 0.004567 - as an example.
Now you can ADD this number to the least significant figures you recorded earlier for frequency of CH2 source.
For example if the least significant figures were 0.01Hz - then adding 0.004567 will yield 0.014567 Hz
Now you will have CH2 calibrated to 'atomic time' accuracy and the frequency will be 10.000 000 014567 Hz
Hope the above procedure is useful for anyone wanting to calibrate CH2 frequency to the CH1 reference (as used in the above example