Products > Test Equipment
SA bandwidth for precompliance testing
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jmw:
If I'm interested in EMC precompliance testing (with both conducted and near-field probing), are the lower-specced analyzers around 1.5 Ghz capable for the job or is more range needed? Let's say I'm mostly interested in looking at power supplies, which usually switch in the 100s of kHz - 1s of Mhz range.
tautech:
The SSA3021X has probably been the most popular for EMI work @ $1395 and mainly due to the improvements to 3.2 GHz that can be made to it. Of the few EMI fiddlings I've done with my SSA3032X I've found most of the emissions in the hundreds of MHz and not well up into GHz.

If your other needs are more varied the new SVA1015X with it's additional capabilities might suit you better but AFAIK you won't be able to improve on its BW. It's too new for other improvements to have been found for it yet but you can be sure some members here will be looking.
Both series of these SA's are advertised as suitable for EMI work.

Hunt out member dazz1 threads as he's venturing down this path and has a SSA3021X.....tweaked I think.
nctnico:

--- Quote from: jmw on July 08, 2018, 06:53:28 am ---If I'm interested in EMC precompliance testing (with both conducted and near-field probing), are the lower-specced analyzers around 1.5 Ghz capable for the job or is more range needed? Let's say I'm mostly interested in looking at power supplies, which usually switch in the 100s of kHz - 1s of Mhz range.

--- End quote ---
For conducted emissions the maximum frequency is somewhere around 30MHz to 100MHz. For probing radiated emissions it really depends on the power supply. I've seen simple buck converters emitting noise to up to 300MHz. All in all 1.5GHz range should be plenty for power supply work unless you are working on really high frequency DC-DC converters.
CopperCone:
since you don't have a preselector you would wanna go 5dB lower then the standard you are trying to meet I think.
nctnico:
I'd be careful recommending a VNA for use as a spectrum analyser. A spectrum analyer and VNA may look the same at first glance but their purpose and therefore construction are different!
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