120129-1111 EST
My Fluke Y8100 DC/AC Current Probe has a 200 A and a 20 A range. Output is 2V for 200 or 20. The range is switch selected.
Before making AC measurements I balance it within 10 MV output on DC with no current.
On AC with a Fluke 27 as the readout meter in the AC millivolt range I read 1.6 mV when away from any significant magnetic fields. This means the probe has a 16 mA noise level without low pass filtering. I might point out that the Fluke 27 reads 0.0 mV with a short across the terminals. This is not true of a Fluke 87. My Beckman 4410 has an AC shorted input noise level of about 0.01 mV (10 microvolts). It also reads about 1.6 mV with the Fluke current probe.
If I switch to DC with the Fluke probe, then I can see the effects of the earth's magnetic field. This includes going from positive to negative with orientation.
In AC on the Fluke 27 the magnetic field from the current in my water pipe is insufficient to produce a reading above the noise level with nothing thru the probe hole. My water pipe is too large to clamp around it with the Fluke probe. But within the electrical panel the magnetic fields are great enough to exceed the noise level by a considerable amount, without directly closing around a wire.
Presently I have about 60 mA in the grounding wire to my water pipe, and I have no ground rod at the house.
On splitters --- my new Amprobe ELS2A works with modern 3 prong plugs including the wide blade on the neutral (common, low) side. This is 1x and 10x and I believe a maximum of 20 A continuous. Pulsed higher would be OK. My old Amprobe splitter would accept a 3 prong plug if the wide blade was not wide, but would provide no ground path.
iwire:
What does 5-15 in mean.
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