I have a 7104, actually I had two, but kept the newer one when I retired. If you look inside them, they are a work of art. It would be terrible to see one consigned to the scrap heap. If I lived

Hi John, I just checked. The math looks right. Dan --------------------------------------------

I think we might all be interested in this on-line book I found. Here is a link to one of the most relevant

Chuck I appreciate all your comments and your original comment and point was well taken. And I agree with you, If I was 99.9% motivated about getting a transformer wound that would just work I

I have 13 used Tek scopes, models 7904, 7104 and 7603. Some come on and some don't. I prefer to give them away rather than junk them but can't manage packing and shipping them. Live in Philadelphia

I've made progress but went backward also. I discovered Q1062 was in backwards. Reversing it, I now have sweep in all modes of the sweep switch, however somehow I managed to short CR652 one of the TD

Yes, for a flyback stage, saturation is everything. You are driving the stage with a unipolar driver, and to get the best most efficient use of materials, you have to stay just to the south of

I think I did okay, considering that I don't have the volt nuts ;-) Thanks for the clarification. ST [TekScopes] <TekScopes@...> wrote:

Hi John, I am (or I would be hypocritical) not arguing that you shouldn't do the tests you have done. I too did them in the process of working through the reasons for the 547 transformer failures.

Thanks, I see. I'll keep it in mind when I rewind my 453. In my HP case (flyback-mode PS), saturation was the limiting factor. It forced me to switch from discontinuous mode to continuous mode and

Yep, it is EXTREMELY contagious and very severe, no cure known :) --- ****************************************************************** * KSI@home KOI8 Net < > The impossible we do

On Fri, 27 Mar 2015, Stefan Trethan stefan_trethan@... [TekScopes] wrote: Chemical Voltage Standards are er.., Standards. They do NOT require calibration against same standards because they are

Hi Dave, It was imprecise of me to say that saturation testing is "pretty meaningless in a gapped core." More precise would be to say that it is meaningless for this exercise. You cannot push the

I have a gold standard voltmeter, HP 3456A that takes care of everything. I actually have three very accurate voltmeters but the HP is the one on my bench that I use for a master reference.  It's

Well the reason I set up and did the tests were for a couple of reasons. 1. It's another way to measure L with not much more then a scope and pulse generator, and it covers a higher current mode

To calibrate my whole equipment, I only drive to work! regards Ben Sent: Friday, March 27, 2015 6:10 PM To: TekScopes@... Subject: Re: [TekScopes] Multimeter Calibration and Voltage

For voltage reference, I use a module I bought on eBay for $20 US.  Just search eBay for "voltage reference ad584" (without the quotes) and you will get many examples.  Some use the AD584L chip

Chuck wrote: Thank you for your knowledge and information, Chuck, but I respectfully disagree on this point. Although most of the energy is concentrated in the gap, if you push the flux high enough,

It would be funny if the fixtures from a Tek 575 also worked in the Mastech DMM. [TekScopes] <TekScopes@...> wrote:

Jerry, Here is a link to the user manual. It explains how hfe measurements are