Tester Schematics Needed

Save your money and just buy a used one from an online source. You can pick older ones up for around $25 - $100.

Or maybe you will get lucky and just find one lying around in the garbage!

I did once! Full digital and it works well! One lead has the end ripped off but it was still in the original carrying case with the manual as well.

Digital multimeters start from about £10GBP from places like Screwfix and B&Q <usual disclaimer>, and they usually have them in stock. These and electronics hobby outlets will sell analog meters for about half this figure. It really isn't worth building one.

This one will cost tou $8.00 for the circuit details if you want to build it your self.

http://www.siliconchip.com.au/cms/A_103504/article.html

However I would do an Ebay search first,

http://business.shop.ebay.com.au/Business-Industrial-/12576/i.html?_trkparms=65%253A12%257C66%253A2%257C39%253A1%257C72%253A2388&_nkw=insulation+tester&_dmpt=AU_B_I_Electrical_Test_Equipment&_sticky=1&_trksid=p3286.c0.m14&_sop=2&_sc=1

good luck

You can buy a Sears Craftsman digital multimeter brand new for $30 USD. Im not sure what the real difference between it and a $240 Fluke multimeter is, but if all you're doing is taking simple resistance measurements, I dont see how it would be any significant.

Cool thing about it is it also has a thermocouple port - something alot of the Fluke multimeters dont have.

Thank you for the info.

Tcmtech, you are really lucky one to find such things.

PWSlack, till now I was not aware about those selling places.

Garth, thanks for the link to the diagram (but I feel cautious about the sellers on Ebay).

I strongly suspect that for insulation measurements you want 1Mohm, 10Mohm, 100Mohm. As you have written it, you are talking milli ohms (.001 ohms)... not Meg ohms (1,000,000 ohms). You might want to clarify this.

Bill

I meant megaohms.

What worth spending hundreds on a megaohmeter if a simplest tester would suffice ? As all the induction motors 220 V- 400V AC (on their sure way to become) burnt I'v seen were below 1mOhms, such tester would be most useful.

Btw, a milliohmmeter is a (service) instrument of my dream.