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How Oscilloscope Acquisition Modes Work - Workbench Wednesdays 54

 

The analog-to-digital converters in digital oscilloscopes can do more than just “sample” the data. Modes like Peak Detect can make use of the ADC’s high-speed sampling even when looking at slower signals. This video looks at various modes and addresses when to use Peak Detect, Averaging, and High-Resolution acquisition modes.

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Bill of Material:

Product Name Manufacturer Quantity Buy Kit
RTM3000 - 4 Channel Oscilloscope (RTM3K-COM4) Rohde & Schwarz 1 Buy Now
Bench Oscilloscope - 200 MHz, 1 GSa/s, 14-bit, AFG, DMM Multicomp Pro 1 Buy Now
RF / Coaxial Adapter, BNC, Plug, BNC, Jack, Jack, Tee Adapter, 50 ohm Multicomp 1 Buy Now
 

  • Oscilloscope in peak-detect mode with nearly solid yellow

    I'm currently testing a switch-mode power supply. It has a super strange behavior. On a "cold" start it'll have over 500 mVpp of ripple. After about an hour or so of being on, it drops down to <70 mVpp. I'm still trying to figure out why.

    But, this is a great example of using "Peak Detect" mode. I'm getting an effective sample rate of 1.25 Ga/s. So I'm going to see lower-frequency effects. But, the ADC+Memory controller is still sampling at 5 Ga/s.(I had it down to <500 Msample/s, but I wanted a faster update rate.)