Alan Freeman wrote:It is looking like the IEC socket on your tester is faulty. As an idiots guide, if you power your tester up from a 13A socket, do you get the display of the LN, LE, NE voltages?? You should get something like
If you do get any display, this would indicate the IEC lead and socket are actually good . It is then down to the internals of the tester.
Firstly, I assume you are pressing the CLI button for IEC lead testing.
I am not aware that you can (or should ever) attempt to power up the PrimeTest 250 with the normal IEC socket into the mains supply, surely this will not break the unit but it should also not work as a mains test, as that should come via the special mains cable socket?
When I use my PrimeTest 250 to test an IEC lead, the unit must be disconnected from the mains and the IEC cable firmly plugged in to the IEC socket and the main socket on the front of the unit, on my unit the IEC socket was a little stiff to begin with and required a firm push to make a good connection. You should also make sure when testing a 4-way extension that it is switched on if it has a switch (not relevant to IEC leads though).
One thing I have come across is a fuse that was not seated correctly in an IEC lead plug, this resulted in an O/C reading; pinching the fuse holder arms then re-inserting the fuse solved this problem.
I have always used the short black lead that came with my PT250 when testing extensions, not sure if this is just a bonus item that came with my particular kit as I bought from an authorised Seaward dealer and not Seaward directly, but have never actually tested it or the red lead using the PT250.
You can prove that an IEC cable is good by testing a device using it in the normal way, then you will know for sure that it is the IEC socket on your tester.
I have tested over 100 IEC leads with my PT250 so far, only had one O/C fail which was a loose fuse holder, and have only done 1.5 sites out of 3. For computers there are potentially two IEC leads plus one 4-way extension per desk! Also, I have changed probably over 40 10A fuses for 5A for the low current computer equipment they supply. Why on earth they are sold with 10A fuses I don't know, when clearly their primary use will be for computer kit which typically has a rating of 3A or less.