Zone Trigger Issue.
It appears that the Siglent SDS2000X HD has a Zone Trigger issue similar to the one found in the SDS2000X Plus as described in
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg4428769/#msg4428769On the SDS2000X HD, the Zone Trigger function also fails to trigger at certain frequencies.
The same test as used for the SDS2104X Plus was applied to the SDS2104X HD.
That is, a signal which consists of a Low amplitude pulse followed by a High amplitude pulse.
The objective is to have the oscilloscope only trigger on the Low amplitude pulse and not on both pulses.
The SDS2104X HD is configured as follows:-
Time / Div 100us
Rising Edge Trigger
Fast Acquisation Mode
Zone trigger 1 is set as "Not Intersect" and placed above the Edge Trigger level in the area where the Higher amplitude pulse would be.
The frequency of the test signal is taken from the SDS On Screen frequency display
An example of the test results is listed below:-
Triggering works correctly :- 4638Hz to 4982Hz.
Triggering Fails :- 4984Hz to5306Hz
Triggering works correctly :- 5308Hz to 5636Hz
This pattern keeps repeating
Attached are two screen prints.
One shows when the Zone Trigger is working. The other shows when the Zone Trigger has Failed.
The frequency ranges where the Zone Trigger Fails depends on the Time / Div , Memory settings and Fast or Slow Aquisation mode.