FLUKE, can you make more ghost voltage video lessons to show other applications that would cause ghost voltages? I'm confused why is the ghost voltage 4vac and not 120vac or some other voltage but why 4vac? The LOz mode is putting an impedance/load so its measuring the "difference" or the "residual" of the voltage divider of the remaining voltage. You should example this in detail in the YT video lesson on the LOz voltage divider method of measuring a ghost voltage and real voltage or compromised voltage
Old comment but longer wires results in higher voltages. Test it in a extension cord and you will get a higher reading then on multi plug that only has .5m of cable.
shouldnt you be getting 120 from between hot and ground ? ( if its a 120 V ) this would make sense to me if you were getting a ghost from common to ground.
Hi there - Great question. If the voltages were correct, You would get 120V from hot to ground and 120V from Hot to common. In this video, we went from Hot to ground showing 4V and Hot to common reading 120V. The power strip had the hot on the common side and the grounding had malfunctioned. You are correct, typically it is reversed and the ghost voltage would be on common and ground in this situation. In other situations, with bundling of several wires in a conduit, you may see ghosting as well.
thanks for the feedback, Fluke is my go to Electrical testers of choice, I also purchased several of you NCV testers last Xmas for the apprentices at work ( plumber gasfitter ) cause They fail to realize how critically important it is to know if there is voltage and how to easily identify a hot. :)
Only if it's on a GFCI or RCD breaker. In the US at least, the majority of outlets are only overcurrent protected. Only ones in wet locations (bathroom, kitchen, outside) are protected by a GFCI.
Thanks @MrLeverink I think you just give me the answer, for my question. My RCPD 40A (IdeltaN0,03A) trip each time when I measure live and N or PE(ground). maybe you would know why SV225 hoked with 87V, when measuring live circuit, trigger my RCPD (residual current protection) whenever I touch ground or neutral. No issue when measure de-energized circuit.
That's a nice feature of the 117 but what if you have a Fluke 87? I seem to be finding ghost voltages quite often. How may the ghost voltage be discharged?
Just use an AC/DC Voltage Tester electricians commonly use. These devices have an input impedance of some kΩ. Actually, a simple resistor (few kΩ) in parallel with your high impedance multimeter will do the same.
+Sergej M van you elaborate on this method a little? I'm trying to decide between the 115 and the 117 Fluke and this is the main difference worth considering
shwndh Considering the small price difference, you should go for the 117. If you are an electrician, this LoZ feature might become handy. On the other hand, an AC/DC Voltage Tester (see T90/T110/T130/T150, for exampe) is much more preferable for the every day tasks, IMHO. These devices don't have any ghost voltage issues as they have a lower input impedance, compared to a regular DMM. They cost less, too.
HEY ground to hot should be 120 vac ground to neutral should be low ac neutral to hot is 120 vac - Open ground should be your ghost voltage ??? please correct me if i am wrong ...
@@infectionsman Most likely current will be even lower. I believe, that input impedance goes way up when PTC thermistors used in that circuit get warm. But that's OK because the Low Impedance is only needed to clamp a ghost voltage. But when a real line voltage is present there is no need to keep that input impedance low.
Hi, maybe you would know why SV225 hoked with 87V, when measuring live circuit, trigger my RCPD (residual current protection) whenever I touch ground or neutral. Now issue when measure de-energized circuit.
I have a red unused wire reading a ghost voltage of 100 volts that slowly goes down as I am testing it. Is it safe to use as a neutral wire? I'm trying to install a smart light switch but the previous owner botched the wiring and used the white wire as a hot wire so the only unused wire is the red which is reading a ghost voltage.
