Hello, regarding the audio transformers will this one be adequate (cheap), Issues of grounding (loops and ground potential mismatch) can be avoided if you use a signal source powered by an internal battery and with no other electrical connections. If it is an issue, I usually make do with an instrumentation amplifier suitable for audio work or I transmit the signal as a current instead of a voltage. Just hook them up directly. A standard x1/x10 probe is fully sufficient for this job. If so, be aware that it probably won't stand running to the clipping point for any significant period of time, especially if you're driving both channels. Follow this by setting the input coupling to AC (Alternating Current). Amp earth and 'scope earth should be the same. The first step to connecting and measuring audio with an oscilloscope is turning on the instrument. Looking at the manual, it doesn't look like running a full power test would be a good idea - It makes reference to not using two pairs of 6R speakers (ie. Solutions: Plug scope and signal source into the same outlet. (no other accessories, charger, etc. Hi, if the original point was to test for 'clipping point', you do not actually need a scope. Here are the amp specs: 110 watts per channel, 20 Hz - 20kHz, 0.05% THD, both channels driven into 8 ohms 165 watts per channel, 20 Hz - 20kHz, 0.05% THD, both channels driven into 4 ohms. I don't think I want to test that amp any more. Then remove the back panel of the amplifier and also put the screws in a safe place. https://www.youtube.com/channel/UCECl4aNz5hvuRzW5fgCOHKQ, https://www.ebay.co.uk/itm/2-x-BNC-Male-to-RCA-Phono-Female-Connector-Adapter-Joiner-CCTV-Cable/371976030333?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3D3bed76ce9c014fe38765cc3040d0169a%26pid%3D100033%26rk%3D3%26rkt%3D8%26sd%3D192597486944%26itm%3D371976030333&_trksid=p2045573.c100033.m2042, https://www.conrad.ch/fr/p/neutrik-nte10-3-impedance-50000-tension-primaire-1-2-v-contenu-1-pc-s-515964.html, https://www.conrad.ch/fr/p/neutrik-ntm4-impedance-10000-contenu-1-pc-s-516000.html, Quote from: GumpyGus on 23 Jun, 2022 16:02. For audio up to maybe 50KHz any kind of wiring and connections will do. The amp has a 3-prong plug. I'll stick with low voltage devices for testing. The purpose of the headphones is to listen to the music as you measure it, and earbuds are a good alternative. While this is true for home or portable equipment be very careful with. As written, the spec is not the clipping level, but the power at a reasonable distortion value, and says nothing about shorted load. Here are the amp specs: 110 watts per channel, 20 Hz - 20kHz, 0.05% THD, both channels driven into 8 ohms 165 watts per channel, 20 Hz - 20kHz, 0.05% THD, both channels driven into 4 ohms. When placing your screws, make sure to put them according to the order you removed them. I'm a novice when it comes to oscilloscopes. 'Integrated amplifier' sounds consumer. (2) You can also reduce hum by using an isolation transformer on one or both signal lines. "Outlaw RR2150. Because when I put 160 watts and .01 ohms resistance into an ohms/volts/watts calculator I get 126 volts; that's without any "inline resistor" defined as resistor placed in series in the line leading from the amps speaker output to the scope's probe. where is grant county It is OK. Nice when you are aligning a receiver SSB. I hope we (and I) didn't put you off too much. 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Be sure to check: most amplifiers of that specification have "bridged" output, where neither connects to ground and it will be seriously unhappy if you ground one. There are some points that aren't clear here. used f550 western hauler trucks for sale. My comments about consumer don't detract from the quality of the unit for listening pleasure, even at ear-splitting volumes! At audio frequencies the transmission line impedance becomes irrelevant unless the line is thousands of feet long like a plain old telephone system's cable. Just a note on many of the 3.5mm adaptors. Or if your scope has an A-B mode, plug your signal source across both A and B inputs. I have an integrated audio amp that produces 160 watts into 4 ohms per channel that I would like to test for "clipping point" with an oscilloscope. Using your screwdriver, remove the top panel of the amplifier and safely put the screws aside. 0 Members and 1 Guest are viewing this topic. Re: Which oscilloscope probes for testing audio amp speaker outputs. 3R load with both switched in) because it will fry the mains transformer (or words to that effect). Unfortunately decent quality audio transformers are both rare and expensive. connected). The power at 4 ohms is less than twice that into 8 ohms (at stated distortion) due to the higher current required. Conclude the setting by adjusting the vertical input control to . Step 1. Connect it right up with the RCA adapter and don't even think about impedances. If the amp has a bridged output, you might need two probes. A Free & Open Forum For Electronics Enthusiasts & Professionals, Login with username, password and session length. With say a 1K resistor from A to scope ground to minimize the comm-mode junk. Of course, with the 4 ohm load resistor, the volts come down to ~25.". Those specs make sense, note that the power into 8 ohms is less than 4 ohms. I have used the direct connection method.
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