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I maintain a short list of known-quiet devices including lightning and power supplies. Creating an extensive list with exact model numbers is a fool’s errand. Manufacturers change the internals of

I'm not sure if this is the cause (probably) but it depends on how the 100 MHz reference interprets it. Can you connect to an external 10MHz source (possible from one of your other instruments

Gentlemen, Following advice here, I decided to first check the 10Mhz frequency of the reference oscillator to see if it had drifted and was rather surprised to see it come out on my frequency counter

few years ago- most likely still true. the 40W LED 4 foot replacements for fluorescent bulbs - (remove the ballast and wire to 120VAC) generated horrible RF noise ( 50khz -to 50Mhz+). I took one

That's really interesting. I went back to my files and I see that I have 2 different manuals for the 200CD-605. The '65 manual, HP part #200CD-903, has the diodes backwards, as you said, but the '66

They are very small about 1/8” in diameter, back when i repaired this kind of stuff I ordered them from a watchmaker supply store (frei, borrel) they were used as sprocket gaskets on rolex watches

Hello everybody, I would like to point out that in the 200CD manual the diagram shows the diodes CR1 and CR2 connected incorrectly, ie with reversed polarity. I don't know if any corrected versions of

McMaster-Carr is a good source for O-rings, but if these are really small, a better source might be? Apple Rubber, https://www.applerubber.com/products/o-rings/. Note that you have to choose a size

I pulled out my 200CD-605 manual and my box of salvaged parts. In the schematic I find R40 to be 10 kOhm, 10 watt, wirewound, by Lectrohm. I sincerely doubt if there's anything special about this one;

Thanks for the info, In this case, by my mistake, the resistance R40 is 10K, but it doesn't change your information. The goal is to obtain the original HP resistance according to the photo Best

It sounds like almost worth putting together a list of "known low emission" LED fixtures for others to refer to when selecting their bench lights. I am aware this will be very market-dependent, but

FWIW, here's another possibility. I use 12V LED strips, powered directly from the 12V side of my solar power system. I have only fairly light loads on that side of the system, and with 940AH of

A few years ago we decided to go with LED bulbs in the household, I found that there was a significant difference in RFI between models (20dB+, 1-30MHz) and no correlation whatsoever to price/well

Currently I am thinking the same as Jon - research the high quality LED options and go with the DIY linear solution for the close-in task work.? Of course, "research the high quality LED options" is

Hal, I was just about to post on this - really interested in the conversation and solutions proposed/found! I am currently using a couple of those LED fixtures that replicate the format of fluorescent

use high quality LED strip and EU not Chinese ballast compliance to EMI a nd safety Fluorescent are arcs,and wideband RF and microwave noise emitting Jon

All: I'm in the process of moving and am thinking about the design of my new lab/work area and am trying to decide on the lighting.? In particular I would like to minimize the effect of radiated

I've had to replace 'O' rings in quite a few of these attenuators over the years, in most cases because they had gone brittle and disintegrated. However, two days ago I decided to sort out an 83545A

I looked through my stash and I still have one new push rod with o-rings , I can send you this one free of charge if you email me your adress Sent from

Be cautious when removing the push rods not to break off the tips , you need a needle to push the tips over gently when pulling them out , the contacts actually have a slot that ends in a little hole