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Press System > Work Setting > User Key Set ON. By adjusting the display line to the peak of the highest harmonic, you’ll more easily see the result of amplitude changes during the troubleshooting process.įigure 2 – An example showing a peak marker with display line, which may be used as a amplitude reference.īecause the Display Line feature is rather buried in menus, you can customize the User Key to bring it up immediately (thanks to Rigol's applications engineer, Jason Chonko, for this tip). This is handy when observing a single, or a small handful of harmonics. When activated, it places a user adjustable horizontal line across the screen that may be used as a reference line. The Display Line is one of my most used features. To recall a setup, press Storage > more > select the saved setup with the large knob or up/down arrows > Recall. You can save this setup by pressing Storage > File Type > Setup and then entering a file name (see Saving Screen Traces, below, for instructions). Press Ampt > Ref Level and then adjust the large knob. I then adjust the Reference Level to 70 dB, so that the vertical scale is in even “tens”. Press Ampt > Input Atten and adjust the large knob for zero attenuation. It also helps to adjust the internal attenuation from the default 30 to zero dB for maximum sensitivity. Also, this is the same amplitude units used by most commercial and military standards. I also set the default dBm to dBµV, because I don’t like dealing with negative numbers. This will lower the noise floor by about 20 dB (the approximate gain of the preamp). To do this press Ampt > more > RF Preamp, then turn on the preamp. When probing with the near field probes or current probe, I like to turn the preamplifier on. For frequencies less than 30 MHz (for example, when measuring conducted emissions), then you should use a RBW of either 10 kHz or 9 kHz (if using the EMI option).įigure 1 – The Rigol DSA815TG with built in tracking generator. If you’ve purchased the EMI measurement option, then go to BW/Det > Filter Type and select EMI, then BW/Det > RBW > 120 kHz. To set up the DSA815 initially for 30 to 1000 MHz band, I use a resolution bandwidth (RBW) of 100 kHz (or nearest the EMI RBW of 120 kHz). You’ll find these useful for either near field probing or testing emissions using a nearby EMI antenna. I’d like to demonstrate the instrument settings and measurement features I most commonly use when troubleshooting radiated emissions in the 30 to 1000 MHz region. Many product designers and EMI engineers are using the popular Rigol DSA815 spectrum analyzer for EMI troubleshooting and pre-compliance testing.