Author Topic: Rigol DG1022Z and Vpp  (Read 427 times)

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Offline avhoboken

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Rigol DG1022Z and Vpp
« on: January 06, 2018, 11:18:32 pm »
Hi,

I recently bought the Rigol DS1054Z and the DG1022Z and experimenting a bit to get to know them better. I also bought a second BNC cable to connect both channels to the scope.
The question I have is regarding the separately bought BNC cable, when choosing a sine or ramp wave, all looks good. When choosing a square wave it seems that this cable gives a spike at the beginning of each period, so for example when then generated wave has a Vpp of 5V, the scope sees a Vpp of 7.08 V. And the overshoot is around 50% instead of 1-2% with the included cable.
I don't have this issue with the included BNC cable. I swapped cables to be sure but behavior is only with 1 cable.

Any explanation for this?

Thanks for any help or feedback.
Alex
 

Offline danadak

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Re: Rigol DG1022Z and Vpp
« Reply #1 on: January 06, 2018, 11:54:43 pm »
The 1022 is a 50 ohm Z. The 1054Z is basically a 1M ohm z,
so you need a thru terminator on the 1054Z to make it look like
50 ohms. So transmission line (the cable) is properly terminated.

https://www.pasternack.com/50-ohm-feed-thru-load-terminations-category.aspx



Or build a DIY terminator.


http://www.eevblog.com/forum/projects/home-made-feed-through-terminator-for-bnc/


http://web.cecs.pdx.edu/~greenwd/xmsnLine_notes.pdf



Regards, Dana.
« Last Edit: January 06, 2018, 11:56:25 pm by danadak »
Love Cypress PSOC, ATTiny, Bit Slice, OpAmps, Oscilloscopes, and Analog Gurus like Pease, Miller, Widlar, Dobkin, obsessed with being an engineer
 

Offline Avacee

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Re: Rigol DG1022Z and Vpp
« Reply #2 on: January 07, 2018, 12:57:15 am »
Dave's done a video on traps for young players explaining what Danadak's said about the correct termination.



 

Offline Hero999

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Re: Rigol DG1022Z and Vpp
« Reply #3 on: January 07, 2018, 06:07:03 am »
The output of digital signal generators is often inaccurate/poor at low output levels, so an attenuator is a good idea.
 

Offline avhoboken

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Re: Rigol DG1022Z and Vpp
« Reply #4 on: January 07, 2018, 06:23:20 am »
Thanks for all the help, much more clear now :)

Alex
 


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