Category Archives: Theory about measurements

Some ways to measure ESR

Posted on 7 januari 2018 by pa4tim

There are many misunderstandings about measuring electrolytic caps and their ESR. 99% of the ESR meters are hobby instruments and more indicators as meters. However they can be usable if you understand how to use them and what they measure. … Continue reading →

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Short circuits finding

Posted on 3 mei 2015 by pa4tim

If you have a short in a circuit there are several ways to find them. A short can be a bridge between 2 traces (solderblob or manufacturing fault) , a component (like a short cap) or a protection device that … Continue reading →

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How to repair testgear (and other electronics)

Posted on 1 november 2013 by pa4tim

A lot of the measurement stuff I have, came to me in non working, or long not used condition. Repairing is something I enjoy very much. You learn a lot from it and if you succeed it feels good. A … Continue reading →

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Measuring inductor-cores and transformers

Posted on 25 september 2013 by pa4tim

OK, you say, I have a LCR meter or a bridge so that’s a piece of cake. But inductors are kind a tricky when it comes to measuring. Especcially when they use core material. When I talk about inductors on … Continue reading →

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About AC and RMS meters

Posted on 18 maart 2013 by pa4tim

There are several ways to note the amplitude of an AC signal. An AC signal has a value that switches over a certain time from V- to V+. It alternates between those values. The way to note this value is as … Continue reading →

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All about ESR measurement

Posted on 12 oktober 2012 by pa4tim

ESR is not new. It is not magical, it is not complicated. So it should be easy to measure. Just buy one of the those 50-100 Dollar wonderboxes and you can measure it. But do you now what you are … Continue reading →

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Redenen om zelf te repareren

Posted on 31 december 2010 by pa4tim
Posted in Theory about measurements | Comments Off on Redenen om zelf te repareren

Time Domain Reflection meting (TDR)

Posted on 15 november 2010 by pa4tim

Time domain reflectie meting is een erg handig en makkelijk principe. Grof gezegd, je zet een puls op een transmissielijn. De scoop hangt via een T stuk samen met de pulsgenerator aan dat stuk coax. Er gaat een puls uit … Continue reading →

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HP cross-reference eigen partnummers-industrie nummers

Posted on 14 november 2010 by pa4tim

Deze lijst bevat veel eigen HP component nummers met daarachter het JEDEC nummer. Best handig om te weten dat dat obsolete HP torretje met de benaming 1854-0210 gewoon een 2n2222 is  Met dank aan de onbekende samensteller. Tweede lijst gaat … Continue reading →

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Tek boeken

Posted on 13 november 2010 by pa4tim

Tek heeft in de jaren 60 een serie paperbacks uitgegeven over het ontwerp van meetaaparatuur. Dit zijn ze niet allemaal. Ik heb er meer uit deze serie, een boek over probe measurements en een over curve trace metingen.

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ESR meten (also in English)

Posted on 13 november 2010 by pa4tim

An updated version: http://www.pa4tim.nl/?p=3775 Een ELCO bestaat in werkelijkheid uit een weerstand (ESR), spoel (ESL) en de eigenlijke ELCO. Hier gaan we proberen deze zaken te meten. Om dat te doen zijn er diverse methodes. De beste manieren zijn speciale vectoriale … Continue reading →

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Advies over scopen ivm aanschaf

Posted on 6 november 2010 by pa4tim

In deze pdf vind je informatie over de verschillende soorten scopen, dingen waar op je moet letten bij tweedehands en nieuw aankoop en uitleg over de specificaties en accesoires. Download PDF

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