The Fluke Low Z impedance is 10K or 1K? The Low Z Meter loading is good for testing sense circuits, control circuits, AC or DC motors, open neutral unbalance loads circuits, power supply diodes and filter capacitors and coupling capacitor because the low Z meter loading is putting load. Coupling capacitors will block DC but the Low Z meter will put a load to test the "leakage" of the coupling capacitor which the High Z meter won't test the leakage of the capacitor give a false positive measurement. Same when testing an AC motor or DC motor the High Z meter will test the output Voltage of the motor but the Low Z meter is applying a meter loading so the motors output voltage will pull down sag so its testing the motor under load. Power supply rectifier diodes will test good with High Z meters but will fail with Low Z meters because the diodes is tested with the Meter loading which is testing the diodes Leakage. You should make YT video lesson about testing components with the Low Z meter testing under load.

@takingmeasure

Жыл бұрын

I am not certain about the exact value of input impedance for the Fluke 117, but it is a feature I really like. I use Low Z mode for basic voltage measurements: testing receptacle circuit voltage, etc. I like your suggestion for going deeper into the various issues and results when using either high impedance measurement mode or the Low Z setting on specific components or circuits. There is no end to this stuff. Thanks for the comment!.

@waynegram8907

Жыл бұрын

@@takingmeasure If you look at different products the label on the back will say how much current consumption it takes to energize or power on the circuit. Different types of loads can measure the same DC resistance value but will draw different amounts of current which is the main differences between different types of loads. Different types of loads will measure DC resistance lets say 100K resistance but each different type of load will draw and consume a different amount of current. Examples a Vacuum, toaster, Scanner Fax machine, Vegetable Steamer, lets say all measure DC resistance as 100K load but each load is going to consume and draw a different amount of current. An Analog meter simpson 260 has meter loading effects and so does the fluke 117, but how much current is it consuming and drawing. Something to think about to make a YT lesson about because its not about the Loads DC resistance but also the Loads current draw consumption.

@waynegram8907

Жыл бұрын

@@takingmeasure When using the Fluke meter in Low Z mode connect a Current clamp around the RED probe to measure the current consumption of the current under test. If the current under test is 1K and the Fluke meter low Z mode is 1K which is 1K/IK= Half the supply voltage or source voltage. If the current under test is 10K and the Fluke meter low Z mode is 1K that is 10K/10+IK = V out . The Voltage divider RATIO keeps changing depending on the circuit under test TOTAL resistance which changes the RATIO of the voltage divider. You can use the current clamp to connect around the Fluke DVM meter RED or Black Probe to measure the current draw and the measured voltage which V/I = Meters Low Z Resistance. Something to think about to make a YT lesson about.

@takingmeasure

Жыл бұрын

@@waynegram8907 There are so many things to test and explore. Vastly interesting, too!