Does anyone use the UNI-T 528 test tool

[PenllŷnShan]

I would start by checking for the existence of an earth wire in the plug.
then look in the machine to see if it is terminated to anything.

Definitly has an earth wire lol. What do u mean by terminated to anything?

 

[James]

Definitly has an earth wire lol. What do u mean by terminated to anything?

What is the earth wire connected to a screw terminail?

 

[PenllŷnShan]

What is the earth wire connected to a screw terminail?

It was screwed via a tab at the end of the earth wire onto the metal frame of the chiller
Sharon

 

[James]

you should be able to measure earth continuity from this point to the 13A plug, if no continuity then replace cable.
however I am surprised that you would plug it in after discovering a fault in the earth.

 

[PenllŷnShan]

you should be able to measure earth continuity from this point to the 13A plug, if no continuity then replace cable.
however I am surprised that you would plug it in after discovering a fault in the earth.

I was unable to test the earth continuity...........my machine couldn't read it. Hence my query. I didn't plug it in, custmer insisted on doing so. And an electrician has apparently since been able to pass it. My query was why couldn't my UT528 test it? Was I doing something wrong, or was it outside my machine's capabilities?

 

[James]

You are misunderstanding, you should be able to measure the continuity of any piece of wire from one end to the other.
if you can’t read it on your tester, it is not there to read and is a fault either in your test method or the cable.

 

[PenllŷnShan]

You are misunderstanding, you should be able to measure the continuity of any piece of wire from one end to the other.
if you can’t read it on your tester, it is not there to read and is a fault either in your test method or the cable.

Thanks for your patience James. I am new to this so maybe don't use the right words. I do of course understand that I should be able to measure the continuity of any piece of wire, and that is exactly what I was trying to do with my UT528 on this appliance. Usually when I test it gives me a reading, which I can then see is either a pass reading or a fail. However on this occasion the machine was just saying "fail", no reading in numbers at all, wherever I attached the probe on the casing, which was all metal. So I was unsure whether it was reading it at all! Or a genuine fault. As it was later passed by another technician I assume I was doing something wrong and was merely trying to find out from you guys what, if anything, I should have been doing. I tested the machine at home on our own fridge and it worked fine, so not the machine. I wonder if I was either not attaching the probe to the correct place, or whether I needed to reset the UT528 for a longer cable or different voltage?
Thanks again

 

[DPG]

I have seen issues before where people rely on the test instrument saying 'Pass' or 'Fail'. But a tester should know what results to expect, and what they may mean when they are outside limits. There may be a need to perform manual tests in some cases.

 

[davesparks]

. As it was later passed by another technician I assume I was doing something wrong and was merely trying to find out from you guys what, if anything, I should have been doing.

It is at that point you just get your multimeter out and check for continuity between plug and the machines earth terminal and between the earth terminal and the suspect metalwork.