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Hi Congrats Try a look at eevblog---they have done alot of work with HP 3458. Regards Hardy Fra: [email protected] [mailto:[email protected]] P? vegne af

Hey, bad-mood-Dave! Children takes the bad quality chinese crap because of price. I was (still I am, surely) a very poor guy and had to use bad quality tools in my childhood. And suffered the effects

I think I might still have one or two.? Of course they are perfectly safe unless you mistreat them, and that applies to so many things.? I'm always on the lookout for Hg in old thermostats, etc.?

Time is also a problem to long in the tank is a guaranteed over etch.

Radu, Totally agree. I have spent some time in what we will call heavy industry. It is one thing to know that a Tek 576 can light you up with 1500 Vdc and might kill you. It is QUITE another to stand

Thanks!

Dave, Eric! (as I've known you as Zen over emails), Agewise, I'm probably right between you two, though I'll wager far closer to Eric than Dave. Likely at least the same generation. I've been doing

So the challenge you run into when building replacement modules ( and I am entertaining the idea right now for the power amplifier MIC in the 8753 sources ) is that first of most microwave circuits

Back when I worked at UT as a research engineer we had a laser cutting system for MMIC Dies , it was a interesting device but required a lot of skill and experience to use , when you looked through

With FR-4 you definatly have issues with ER lot variations this is why you use materials like rogers 4350B

Whether or not a board under etches traces, or over etches traces is entirely dependent on the resist used. Insulating resists don't create any fields in the tank, so they tend to over etch the

A few words on FR-4 and RF boards , FR-4 generally “works” ok for RF boards up to 2GHz but if you use coupled microstrip filters or directional couplers you are going to have the time of your life

Back in 1972, when I worked for DEI, I did photo resist application on circuit boards, and it is trivial. We had a stainless steel rectangular tank, big enough so you could vertically dip the biggest

You can get the clip from Artekmedia. The first step is always to check all the low voltage power supply voltages. The calibration on the 3458a just needs a precision 10 volt reference and an accurate

On a quick note - just wanted to congratulate you for the score - assuming you didn't pay an arm and a leg for it (as they tend to go for, last I checked). Good luck with the repair! I'm certain this

Definitely true for garden-variety FR-4 board material.? For serious microwave work, say >6GHz, you'd want a more stable material, like those made by Roger's, Isola, etc.Jim FordSent from my T-Mobile

I am trying to restore an HP3458A DVM and I need a little help. I acquired this unit on ePay some time ago and I finally found some time to check it out. The outside and inside are both neat and

Laser toner wont work for microwave circuits for a variety of reasons….. The way i did my boards was to plot out a layout magnified 10:1 , then dad took the thing to work and used a repro camera to

Sure, Dave, I'll send you an email off list to request the address. Thanks!

I've looked at the laser'd traces from above a lot, tested their isolation with a megger, etc and found them all satisfactory, but I don't know how the roughness is side-on. It would be interesting to