Dsa815 conducted emissions
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One minor thing I couldn’t help noticing was that the carry handle, while mounted with metal pins (comforting), wasn’t mounted at the center of mass, so the unit tilts slightly forward when carried. Obviously, there's some shielding inside. The second thing that struck me was the weight of the unit for its size at 9.4 pounds. It's no larger than some of the smaller-size budget oscilloscopes with dimensions of 14″ wide by 7″ tall by just 5″ deep. Upon opening the box, the first thing that struck me was the small size of the unit and the apparent quality of the enclosure and controls.
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A full review will be upcoming on their web site soon.Figure 1 – The Rigol DSA815TG (with tracking generator).
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Ultra Spectrum (PC) software option (provides additional analysis, including a waterfall display)Īfter getting some hands-on time in a local EMC test house where we performed some real conducted and radiated emissions measurements, I published a more detailed “first look” in Test & Measurement World’s EMC Blog.Connectivity: LAN (LXI standard), USB host, USB device, GPIB (option).EMI filter and quasi-peak detector option (200 Hz, 9 kHz and 120 kHz BWs).
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I loved the large color screen (800×480 WVGA). I added the guide to my iPad for easy reference.
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The user guide is supplied on CD or available as a download from their web site. Obviously, there’s some shielding inside. The second thing that hit me was the weight of the unit for it’s size at 9.4 pounds. It’s no larger than some of the smaller-size budget oscilloscopes with dimensions of 14″ wide by 7″ tall by just 5″ deep. The first thing that struck me was the compact size. However, with all the discussion of this product lately, I thought I’d give a few first impressions. I was able to get my hands on a review unit and am putting it through it’s paces in the next couple weeks. There are a number of other options available. A tracking generator option will run an extra $200 and the EMI option, which provides quasi-peak detection and the three EMI bandwidths (and especially excites us EMC engineers), is an extra $600. If there’s been one spectrum analyzer that’s created buzz lately, it’s the Rigol DSA815 budget ($1,295) spectrum analyzer, which tunes from 9 kHz to 1.5 GHz. To read more about constructing a simple demonstration of resonance, click here… The resonant frequency of the circular cavity is 1.225 GHz, very close to the calculated 1.274 GHz. In this configuration (where a < b < c), the TE 011 mode is dominant, because it occurs at the lowest frequency at which cavity resonance can exist. Below this cutoff frequency, cavity resonance cannot exist. Cavity resonance can only exist if the largest cavity dimension is greater, or equal, to one-half wavelength. Where: epsilon = material permittivity, mu = material permeability and m, n, p are integers. For example, for a rectangular enclosure, we have: More commonly, you’ll discover resonant modes created by the product enclosure. For example, I’ve seen the tines on a microprocessor heat sink resonate in the 2+ GHz region. This internal amplification can cause a myriad of mysterious couplings internally to your product with resulting radiated emissions.Īny metal structure can become resonant if driven by a noise source. If you’ve already done a good EMC design and are still getting radiated emission problems, then perhaps resonances in the product enclosure are, in effect, amplifying the internal harmonics.
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There are times when an increase in harmonic content can’t completely be explained by circuit or PC board design.