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

Hi, I recently junked my last meter with hfe and temp functions. Looking at Mastech MS8264 on ebay I see a hfe position but no xistor socket. does anyone know how transistors are tested on this

I own a vintage Hewlett-Packard VTVM calibration system (DC and 400 HZ), originally used by HP field techs. The last calibration run showed the output accuracy as 0.1% or better on all ranges. Dale

It all goes back to that old saying regarding a man with more than one watch never really knows what time it is... I do the same as far as using a DMM. No, it isn't calibrated, but my DMMs pretty

It's curiosity like this that leads to 'addiction' to metrology. Be careful. Since you will never actually know the exact value of any 'standard', you have to have something in your lab that you

I made a very simple board using one of the voltage reference chips. It's plenty accurate enough for an analog meter. A few high-precision resistive dividers are handy for other voltage ranges.

I don't think a chemical voltage standard would be all that useful, since the voltage does change as they age. In a cal lab they would be periodically compared wih a superior standard, and they'd keep

Henryk: I have seen certified voltage standards at some of the companies where I worked. They usually had their voltage stamped on the outside to 5-digit accuracy and traceable to the National Bureau

Havingretired in Nov 2014 at 59 after a long career in electronics,  I decided to pursue my passion          for guitaramps and have taken on a couple of commissions to design and build some

It would be interesting to know how members go about and keep in check accuracy of their workshop multimeters. I have 5 multimeters and each is giving slightly different results. It would be nice to