How to use an insulation Tester - HIOKI 3110MΩ Hi Tester ???

[kagliostro]

At a Flea Market I got (really ceap) an HIOKI 3110MΩ Hi Tester (1000V - 2000MΩ)

There was a problen at one of the battery holders but it was easy to repair it

now the real problem, I've never used such an instrument and no instruction on the box

afrer a long searc on the net the only things I've find are a small movie on YouTube and a pdf with the instruction for use

https://www.youtube.com/watch?v=DCojm-eE1e0

Unfortunately I understand near nothing looking to the movie and the user instruction sheet is ..... in japanese 


On the back of the instrument there are instructions, but I'm not able to use it 




I was thinking to use, if possible, the instrument as to verify transformers windings

But .... how to do ?

Many Thanks

Franco

[PRR]

Here is a manual for a later product. Put in the batteries, put the two probes across the insulation you want to test, and press the button. 2Meg is probably bad, 1,000Meg is unlikely in a humid climate. Check known good transformers to get an idea what "normal good" is.

[kagliostro]

Many Many Thanks PRR

Franco

[kagliostro]

I've read the instructions and they are perfectly usable also with my model (3110) having the 3118 only few more functions and being near the same instrument

Only one thing (my ignorance), I don't understand, what is volumetric resistance ???

is it possible to have an explanation about ?

Many Thanks

Franco

[sluckey]

I'm not familiar with that term. Perhaps it's the same as Volume Resistivity. Search google for "volume resistivity" and see if that may be the same as "volumetric resistance".

[kagliostro]

Ciao Steve, Thanks

I've find a page that explains what is volumetric resistance but don't understand the explanation


My brain is too small for all the info I try to put on it


 


Franco

[shooter]

I recall the term from the way back days when we used meggers to verify ground planes(?)


here's a paragraph from the attached pdf, not sure if it helps 


"Resistance/resistivity measurements are used for predicting the ability of insulating type materials to dissipate a buildup of electrostatic charge. Materials that are coated, chemically treated or contain an internal antistatic agent have static dissipative characteristics that are a function of surface resistance/resistivity. On the other hand, materials that are loaded with a conductive material, such as carbon, are both surface and volume conductive. In most cases a material that is volume conductive is also surface conductive but there are certain composites or laminates where this rule does not hold true."

[kagliostro]

Ciao Shooter

Many Thanks

Franco

[GAStan]

A couple of things about meggers...

Be careful of the voltage you are testing at, you can actually damage the insulation by testing too far above its rating.  Some meggers go well above the 1,000 Volts mentioned here so I'm posting this for future readers of this post.  When the insulation breaks down there is an electrical arc which burns the insulation leaving carbon-effectively making a resistor.  This has ruined many motors and transformers.

Meggers can be fun.  Wet a piece of wood, crank up the megger to its highest voltage and put the probes in close proximity on the wet wood until there is arcing between them creating a Lichtenberg design.

Remember SAFETY FIRST. Never, ever, connect the probes to bare wires and place them on your buddies favorite seat.   

In case anyone is wondering I have personally experienced all of the above, being on the receiving end of #3.

Glenn