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ATS

Analog Discovery 2 WaveGen noise below 50mV

Question

Performing the initial "Getting Started" "Step 7: Take a Measurement" at 1V@20kHz 'looks' as expected, but at 20mv@20kHz tremendous noise is visible and it gets worse at lower voltages.  The noise is there at higher level signals, e.g. > 50mV but it's just harder to notice on the oscilloscope.  The result is the same with factory and local calibration.  Unchecking the oscilloscope channel's "Noise" checkbox does not help.  

Is this device defective or is this a product limitation?  Could you please advice on how to get a clean low level signal? 

Platform: USB powered Mac installation on a MacBook Pro under OSX 10.11

Attached PDF: window shapshots of WaveGen and Scope at 1V and 20mV; picture of AD2 connections. 

 

AD2 signal noise.pdf

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Hi @ATS

What you see is the normal noise floor of the device.

The scope inputs of AD at 500mV/div or lower are at high gain, ~5V pk2pk range. The 5-10mV noise is 0.1-0.2% of the input range.

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