Hewlett Packard 350D Attenuator Set 5W-55V, One That Was Actually Tested GOOD!!!, US $490 – Picture 0

Hewlett Packard 350D Attenuator Set 5W-55V, One That Was Actually Tested GOOD!!!, US $490 – Picture 1

Hewlett Packard 350d Attenuator Set 5w-55v, One That Was Actually Tested Good!!!

US $490

Garden Grove, California, United States
Jun 9th

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This is a good working piece of test equipment. Unlike every other frighten schmuck on EBay that sells test equipment I actually tested the darned thing! Go figure! I used a precision signal generator with 600 ohm output impedance I was doing some other testing with, then used a recently calibrated distortion analyzer, with a 600 ohm input impedance, analog type, to indicate 1 and 10 dB attenuation using a 10vrms reference at 60hz, 5k, 50k and 100 kHz. Basically any attempt to attenuate in 10 dB increments will resolve an honest 10dB cut on the money. Any attempt to cut using the 1dB resolution I believe will nail 1dB plus nothing, minus potentially 5% based on my meter deflection. The load on my signal generator was significant, it's a weeny unit with no big nads but it is very low distortion for audio design so I keep it around. When the attenuators are selected it does change my signal generator output voltage so the error in the 1dB attenuators control is VERY Suspect!!!!!! I don't think there is any error. I think it's holding as tight as it ever has and my signal gen is diving a bit under varying load. I can get deviation in the signal gen by wiggling interconnect cables. But again it's very low distortion, very low! And very happy with stable unchanging vacuum tube input loads. I am unsure if there is any calibration aspect aside from actually replacing the precision dividing network resistors in the control section. So..... I'll call it "uncalibrated" at this time and it's up to you to attempt to verify just how close a 1dB cut or boost actually is beyond my plus nothing/minus 5% value. If I did all the work, I should be selling it for it's real value, over a hundred bucks. So there it is. It's clean, ready to deploy on your next project. No stickers, not repair tags, don't know about bandwidth from DC to 1meg but it works fine in audio realm and tested to 100k just fine. See my feedback and very happy buyer list for confidence. Sold as is with no returns accepted. Price is fair for what it is, buyer pays shipping usps fr medium box from 92845, USA $13.50. It's a simple device, a simple sale and will serve someone very well for the next 10-15 years on their bench. It is Not a POC, that is sold as untested, "I don't know what it is, don't know much about it, don't have a clue what my name is, geez I don't have the time or ability or sense or brains or fingers to actually prove what I'm trying to sell is NOT scrap or e-waste". I'm pretty sick of flippers buying lots of crap and then selling items as " sucker bets" to folks. Don't sell it unless your Cracker Jack enough to know what it does, for goodness sake. This is the way of the new world and it stinks! Thanks for looking, sorry for the sermon. Mike!! So the long story is if you cut using 10dB knob you get spot on 10 dB. If you cut with 1dB knob, I believe you may have a 5% maximum error, and I'm being very conservative on the error. I believe the error is smaller, my signal gen didn't like driving the cascaded loads of the attenuators and the distortion analyzer.