Fluke 1651 2 lead Ze test

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v101

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Hi,

Forgive me if this post is answered elswhere .. :Blushing ...I cant find it, so here we go -Can I test Ze using just using line and earth leads on a bog standard Fluke 1651. If I want to find PFC can I manually switch (2 lead) testing between earth neutral myself. I don't want the bloody machine to calculate, I want to read myself - however the manual seems to indicate a three lead test is required in all loop tests.

Help on this would really be appreciated.

Thank you.

 
Thank you Andy, so just to clarify if I toggle (using F1) to either PFC or earth loop impedance, I still connect neutral and earth to earth in both instances for each respective test?

 
:BlushingSorry above should read - connect both to neutral....

 
When you press F1, the three small dots at the top of your screen will change to two small dots, on the "N" and "L" markers; they are there to tell you which sockets are used on a particular test.

So, if you`ve just done 3 lead Ze; press "F1", earth lead isn`t used (you can leave it where it is, it doesn`t matter), and machine will test between L and N, and provide PSCC

kME

 
This I promise is my last question - I want to do a 2 lead Ze using the 1651. Lets say on a TT system. I have removed/isolated earth conductor from the MET and am ready to crock an earth lead on and test to incomming phase. The manual still indicates a connection to neutral, and I can't get my head around it. Can I go ahead and use just earth and live for this test. I suppose this question relates more to the 1651 and someone familiar with it. Please remember I am learning - it is a trade where pedantic is not a fault in my opinion. Untill I fully understand I will never improvise - all by the book at the moment and a good dose of confusion often hits me. It's the best type of learning when you come out of the other side with guided help but doing a bit of mental graft yourself. I don't want aids to help me get through training, I really want to fully understand the job.

 
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If you`re doing the2 lead test (which shouldn`t be used for the Ze / Ra test really), the neutral lead would connect to the earth conductor, and the phase to the phase. That will provide the reading, as long as there isn`t an RCD upstream - you`ll trip it!

KME

 
Im pretty sure the manual tells you to put the neutral neutral on so the tester can verify supply polarity before it does the Ze test!

 
I use a 1652 for testing and all the Neutral lead does when testing using the 3 lead method is to monitor the voltage traveling through to earth and allow tests to be conducted with an RCD installed. so if it raises to 50/25 volts it terminates the test (Fluke engineer told me this when I queried some results I was getting) you can use just the line and neutral leads for testing Ze/Zs and select the test method with F1, but this method will trip RCD's and you must bare in mind if you have poor earth return path ie. high Ze/Ra you can raise all exposed and extraneous parts to 230 volts SO BEWARE all the line and neutral leads do is to measure the resistance hope this makes sense CJS

 
I can understand Zs causing a trip, Ze I can't it's external to the system. The Ze (in my thinking) is line from the supply substation/transformer back to their earth spike (fault current) (TT). Any tripping can only be caused in Zs via R1 R2 that the RCD is connected. I can understand neutral connection use when PFC is calculated by the machine and it needs to know (highest) of both neutal and earth faults. Am I so far off the mark......?

 
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