Products > Test Equipment

RD JDS6600 25MHz 2-Channel DDS AW Function Signal Generator

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pascal_sweden:

--- Quote from: pantelei4 on July 13, 2017, 12:32:26 pm ---The device has a very poor Electromagnetic compatibility,
Interference is caused by DC / DC motherboard converters.
This is noticeable immediately after switching on, if we put a probe next to it.
Sensitivity 500uV / div
Bandwidth 300MHz
The probes of the oscilloscope are connected to ground, there is no signal at the input,  noise JDS6600  is very high.

--- End quote ---

Maybe it's because of your lousy way of connecting the probes to the signal generator.

Why on Earth don't you have decent BNC cables?

First time that I see a Rigol DS2000A user (supposed to be professional player) without decent cables :)

pantelei4:

--- Quote from: pascal_sweden on July 14, 2017, 07:37:42 pm ---Maybe it's because of your lousy way of connecting the probes to the signal generator.

--- End quote ---
Of course yes.
If you turn on the bandwidth of 20MHz, interference will become significantly less.
But connected in the same way to the MHS5200A, with a full bandwidth there is no interference from the DC / DC converters of the motherboard.
The JDS6600 has a noise of the ground, With a repetition rate of 400kHz and a spectrum wider than 100MHz. I consider this a design error. The video was shot specially to show it.

pantelei4:

--- Quote from: pascal_sweden on July 14, 2017, 07:37:42 pm ---First time that I see a Rigol DS2000A user (supposed to be professional player) without decent cables :)

--- End quote ---
I'm not a professional, just an amateur. :)
Two signals, small approximately equal level.
Yes, the ground clamp loop catches radio interference, which creates a power source.
Now I need to think about how to reduce EMI, when the developer should take care of it.
JDS6600
Analog no name.

pascal_sweden:
If I am correct, the actual designer of this signal generator is in this thread. Maybe you can PM him with your suggestions to further improve the design.

I will wait ordering the device until the Mark II version becomes available :)

pantelei4:

--- Quote from: pascal_sweden on July 14, 2017, 10:40:06 pm ---If I am correct, the actual designer of this signal generator is in this thread. Maybe you can PM him with your suggestions to further improve the design.

--- End quote ---
Probably the designer needs to study AN139 - Power Supply Layout and EMI
http://cds.linear.com/docs/en/application-note/an139f.pdf
Why should I pay for other people's mistakes, and then help solve the problem?

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