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  • Question about the difference between an ohm-meter and a megger
    A ohmeter, is designed to measure ohms actually it dosent measure ohms it calulates ohms based on an applied voltage and a measured current, (snip) Right, I understand that, if the megger reads 500 Meg, the ohmmeter should read an overload, but it didn't It read 50K or so that's the wierd part of it
  • Figuring wire length with a ohmmeter? | Information by Electrical . . .
    An ordinary ohmmeter won't do it From the ITT "Radio Engineers Handbook" the resistance of #3 Annealed copper wire at 20 C (68 F) is about 0 197 ohms per 1000n ft Thus, your resistance for 600 ft would be about 0 118 ohms To measure this you need a 4 terminal ohmmeter This you can make by connecting a known DC current of about 10 A thru the
  • Digital Multimeter for resistance | Information by Electrical . . .
    The ohmmeter reading are actual readings Take my 20K reading of 04 Larry says "For example, if you get a reading of 3 87 with the scale set to 20K, then the resistance is 3 87K ohms So that means my resistance would be 04 ohms, but my reading at the 200 ohm scale was 44 9 ohms No, it means 04 K ohms
  • Testing three phase motors - Mike Holts Forum
    A two-wire ohmmeter won't be accurate enough to detect shorted turns, but a four-wire ohmmeter might If you are going behind a two wire ohmmeter, an impedance meter that applies an AC test voltage will be even better at finding a shorter turn Sent from my XT1585 using Tapatalk
  • coil ohms | Information by Electrical Professionals for Electrical . . .
    Re: coil ohms If you are getting a 2 ohm reading with a basic ohmmeter, it is just the DC resistance When energised from a 120 volt AC supply, there is also considerable inductive reactance Both combined, the impedance, determines the current drawn by the coil Ed
  • Control Transformer Winding Resistance Test | Information by Electrical . . .
    Remember that when you use a DC powered ohmmeter what you are reading is the DC resistance of the windings When the transformer is actually in use the current through it will be in two parts: 1 The magnetizing current for the core, which will be almost purely inductive and will depend on the impedance of the primary at 60Hz, not at DC
  • Ohms law 120V halogen 50 watt bulb | Information by Electrical . . .
    Testing 120V halogen 50 watt bulb with ohmmeter = 35 5 ohms Using Ohms law: E squared wattage= 14400 50=288 ohms Why do I have this difference between metered ohms and calculated ohms?
  • Testing a Solid State Relay???? | Information by Electrical . . .
    I have no doubt, but as a general rule testing a solid state relay with a just an ohmmeter is just not the most reliable way to do it You would first have to know with certainty the the device under test can be tested with a meter
  • Infinity readings | Information by Electrical Professionals for . . .
    Along with some less common methods, an ohmmeter can apply a fixed voltage, and measure the current The display must read the inverse of the current, making for an odd looking scale on an analog meter
  • Ringing Out A New Electrical Installation
    Inside a panel it can be easily done with an ohmmeter to verify that the wire is continuous For long field runs that are often damaged in pulls the only practical solution is to megger them A pulled wire can ring out but still have insulation damage In fact, insulation damage is far more common than broken wires





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