Question about Extech EX820 True Rms Clamp On Electric Current Meter With Infrared Thermometer

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How could one create a electric current and change to magnetic field?

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Hi,

It sounds like you are trying to make an electromagnet .. for small scale purposes try the information at this link http://www.wikihow.com/Make-an-Electromagnet

If this helps please leave feedback

Posted on Feb 05, 2010

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No 110 voltage


Check the circuit breakers for a tripped one. If all OK, then the brushes may need to be replaced. Here's a tip on how to flash the field in the generator: This tip comes from the Briggs & Stratton Customer Education Department. As an alternative to flashing a rotor winding with a battery applied to the brushes, an electric drill may be used. Follow these steps to flash the generator:
  • Plug the electric drill into the generator receptacle. (Cordless drills do not work)
  • If the drill is reversible, move the direction switch to the forward position.
  • Start the generator
  • While depressing the trigger on the drill, spin the drill chuck in reverse direction. This will excite the field and the generator will now produce electricity. If spinning the chuck one direction does not work, try spinning the chuck in the other direction as you may have the reverse switch positioned backwards.
Use caution not to get your hand or other materials caught in the chuck. As soon as the field is excited, the generator will produce power and the drill will turn on.
The reason this works is because the electric motor in the drill will act as a small generator when spun backwards. The magnets in the drill's motor induce a voltage into the motor windings, which is fed back through the trigger, cord and into the generators receptacle. From there it goes into the power winding of the stator. The voltage going through the power winding creates a magnetic field, which is intensified due to the iron core of the stator laminations. The rotor intersects this magnetic field as it is spun past the power winding, thus inducing a voltage in the rotor winding. Once current flow is present in the rotor winding the rotor has been flashed.
If flashing the field does not make the generator work, you may have additional problems, besides a lack of magnetism in the rotor. Further testing will be needed. Hopefully, this will give a simple way to field flash your generator if needed

Aug 11, 2016 | Electrical Supplies

1 Answer

How Does an MRI Work


Magnetic resonance imaging (MRI), also known as nuclear magnetic resonance imaging, is a technique for creating detailed images of the human body.
The human body is mostly water. Water molecules (H20) contain hydrogen nuclei (protons), which become aligned in a magnetic field. An MRI scanner applies a very strong magnetic field (about 0.2 to 3 Teslas, or roughly a thousand times the strength of a typical fridge magnet), which aligns the proton "spins."
The scanner also produces a radio frequency current that creates a varying magnetic field. The protons absorb the energy from the variable field and flip their spins. When the field is turned off, the protons gradually return to their normal spin, a process called precession. The return process produces a radio signal that can be measured by receivers in the scanner and made into an image.
What is an MRI Magnetic Resonance Imaging

Jul 23, 2016 | Televison & Video

1 Answer

When were electromagnets invented?


In 1820 Hans Christian Orsted discovered that an electric current could create a magnetic field and in 1824 William Strugeon invented electromagnet.

Jan 15, 2014 | Tools & Hardware - Others

1 Answer

How does a basic metal detector work?


The simplest type of metal detector contains an oscillator which produces a current through a coil which in turn creates a magnetic field. If a piece of electrically conductive metal is close to the coil, it will produce an electric field of its own which is then measured and detected by the metal detector.

Jan 10, 2013 | Retail Supplies

2 Answers

I have a 1960 chevrolet with a generator. I would like to convert to a one wire altenator. What is the wiring needed to connect this up.


You need to replace original bulbs, sockets, fuse box, starter etc with 12v equivalents or better yet check w/ JC Whitney company (Chicago) they specialized in conversion kits.

Mar 15, 2011 | Chevrolet Corvette Cars & Trucks

1 Answer

Since the older cars had generators removing the belt had no affect with the motor running until the Battery went dead,also the car would run without a battery because of the permenant magnets in the...


Hi, I am old enough to have worked on both systems. Now, when you remove a belt from the newer or older systems, the engine will run as long as there is enough voltage in the battery. No difference here. The generator dies not have a permanent magnet but residual magnetism in the rotating armature. It would build up voltage and would have to have the regulator control the output. The residual magnetism is a small amount and is similar to the residual magnetism that is currently used in all portable generators or to be correct portable alternators used for your 120 / 240 volt electricity. The car alternator does use a rotating field that relies on an electrical current supplied by the battery through a regulator. The vehicle will still run if the alternator is disconnected, until the battery runs low or an electrical load of sufficient current draw will cause the ignition system to drop out, thus the engine stalls. Remember the same was true of the generator systems as well. I have driven automobiles where the alternator failed and the engine shut down a few hours later. There is no difference with removing the belt or having the alternator or generator fail with the belt on, there is no output to charge the battery and keep the voltage up to run the vehicle. A generator is a device which makes electricity in a DC format. An alternator is a device which makes electricity in an AC format which can be used as AC or converted to DC. Either can have permanent magnets in the rotor. But we use regulators in most cases because with plain magnets, we cannot accurately control the output.

Mar 06, 2011 | General Tools ETK100 Utility Kit...

1 Answer

Cant find wer the spark plugs for a 2001 hyundia sonota


Could be a cover over the spark plugs or plugs have coil on plug system: Ignition System WARNING
To avoid personal injury and/or vehicle damage, refer to the service precautions at the beginning of this section.
General Information NOTE: For information on understanding electricity and troubleshooting electrical circuits, please refer to chassis electrical.
Coil on Plug (COP) System
The coil over plug system was developed so that spark and spark timing could be better controlled on an individual cylinder basis. Each cylinder has an ignition coil mounted directly above the spark plug on the cylinder head cover. A short suppresser/connector replaces the spark plug wire and links the coil to the plug. There are different methods used for primary triggering. Some manufacturers use a combination coil/module, which means each coil has its own control circuit that is activated by the PCM. Others use remote mounted modules to trigger the coils.
Each individual coil is allowed to saturate while all other cylinders fire. For a V-8 engine, this allows a period of seven firing events for coil saturation, compared to three events for the same V-8 engine with a waste spark system. The coil over plug system also benefits from a minimum amount of energy lost, due to the resistance of spark plug wires.
Distributor System
If a distributor is not keyed for installation with only one orientation, it could have been removed and installed improperly and then rewired. The new wiring arrangement would maintain the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes of the current plug wire locations and orientation of the distributor cap.
Magnetic Sensor / Pick-Up Coil
The magnetic sensor in electronic ignition system is made up of a small coil of wire wrapped around an iron core, a permanent magnet and a toothed wheel called a reluctor. These sensors can be found mounted in a distributor, or at the front, middle, or rear of the crankshaft or camshaft, and are two-wire sensors.
The permanent magnet produces a magnetic field that passes thru the center of the pick-up coil. As the reluctor turns, the small teeth enter the magnetic field. Because the metal is a better conductor for the field than the air between the magnet and reluctor, the field strength begins to increase and reaches its maximum when the reluctor teeth are closest to the sensor. An increase in magnetic field induces a positive voltage to the module. As the teeth leave the magnetic field, the decrease in pole strength induces a negative voltage into the module. This alternating positive and negative voltage causes a small AC current. This alternating current after passing through an analog/digital converter is used by the module or engine controller to trigger the primary circuit.
Hall-Effect Device
Another device that can be used to create a triggering signal is a hall-effect device. A hall-effect device can be thought of as a solid-state On/Off switch. The hall-effect switch is a three-wire device that must receive a power and ground. The hall-effect switch is used in conjunction with an interrupter ring with a series of slots or openings cut into it. Depending on the application, these slots are spaced around the ring in a specific configuration. As the ring rotates, the slots pass between the hall-effect switch, and alternately turns the voltage off and on. When a slot aligns with the hall-effect switch, the controller sees voltage on the signal line. When the area between slots passes the hall-effect switch, the signal is pulled low. This results in a voltage of 0V–0.1V at the controller.
The rotation of the interrupter ring causes the signal to toggle, which causes a continual series of digital pulses on the signal line. This digital pulse is the timing signal that is used by the ignition module or engine computer to open and close the primary circuit. The controller processes these pulses as the RPM signal.
Photo-Optical
Another device used to create a triggering signal is the photo optical sensor. Inside the distributor, there are pick-ups called the Reference pick-up and the Sync pick-up. Each pick-up has a Light Emitting Diode (LED) and a phototransistor. A slotted disc rotates between the pick-ups. The pair of LED’s and phototransistors generates crankshaft position and RPM signals (high and low-resolution signals). The LED’s are powered by a 9- or 12-volt source (depending on manufacturer). Each phototransistor is used to turn a 5-volt signal from the engine controller on and off.
If we look at the optical distributor used in the Chrysler 3.0L engine as an example, there are two areas of slots cut into the disc. The outer diameter of the disc, which generates the high-resolution signal, contains 350 slots. Each of these slots represents 1 degree of crankshaft rotation. An area of approximately 3/8" with no slots represents the remaining 10 degrees. The inner portion of the disc is the low-resolution signal and contains six 60-degree slots. Each of these slots represents the piston’s top dead center position for each cylinder. The controller uses the high-resolution signal to regulate spark timing up to 1200 RPM. This ensures timing accuracy, since crankshaft speed fluctuations are most likely to occur because of the firing pulses during cranking and idle. The low-resolution signal is used for injector firing, as well as ignition timing above 1200 RPM.
As the slots pass between the LED’s and the phototransistors, the transistors are toggled on and off. This occurs as the light beams from the LED’s are alternately interrupted. When the light beam from the LED strikes the phototransistor, the transistor turns on. This causes the 5-volt signal to be pulled low (0V–0.1V). When the rotating disc blocks the light beam, the transistor turns off. This causes the 5-volt signal to remain high.
Ignition Coil
The heart of the automotive ignition system is the ignition coil. The ignition coil is a step-up transformer, since it boosts battery voltage to the high voltage that is necessary for proper combustion.
The ignition coil consists of a primary winding and secondary winding wrapped around a soft iron core. The primary winding is made up of several hundred turns of heavy wire, while the secondary winding consists of thousands of turns of fine wire. The iron core is used to conduct magnetic lines of force efficiently.
When current flows through the primary winding, a magnetic field is created. The more time current is permitted to flow, the stronger the magnetic field becomes. When the current is turned off, the magnetic field collapses causing a high voltage to be induced in the secondary winding through the process of induction.
A few hundred volts will be generated in the primary winding because of the collapsing magnetic field across the heavy primary wire. However, as the magnetic lines of force cut across the thousands of turns of fine wire in the secondary, a far greater voltage is produced. The production of primary voltage is called self-induction, since the primary winding essentially magnifies its own initial voltage when the magnetic field collapses.
Related Symptoms
Faulty ignition system components along with loose connections, bad grounds, high resistance or opens in the circuit, may cause the following symptoms:
  • No start condition
  • Stalling after cold start
  • Stalling after hot start
  • Surging off idle
  • Extended crank time when engine is cold
  • Unstable idle
  • Running rough during off idle acceleration
  • Bucking
  • Hesitation
  • Stumble
  • Poor fuel economy
  • Spark knock

Jul 08, 2010 | 2001 Hyundai Sonata

1 Answer

How to flash or remagnitize Coleman Powermate 6875 or Husky 40500


Field Flashing of Portable Generators This tip comes from the Briggs & Stratton Customer Education Department. As an alternative to flashing a rotor winding with a battery applied to the brushes, an electric drill may be used. Follow these steps to flash the generator:
  • Plug the electric drill into the generator receptacle. (Cordless drills do not work)
  • If the drill is reversible, move the direction switch to the forward position.
  • Start the generator
  • While depressing the trigger on the drill, spin the drill chuck in reverse direction. This will excite the field and the generator will now produce electricity. If spinning the chuck one direction does not work, try spinning the chuck in the other direction as you may have the reverse switch positioned backwards.
Use caution not to get your hand or other materials caught in the chuck. As soon as the field is excited, the generator will produce power and the drill will turn on.
The reason this works is because the electric motor in the drill will act as a small generator when spun backwards. The magnets in the drill's motor induce a voltage into the motor windings, which is fed back through the trigger, cord and into the generators receptacle. From there it goes into the power winding of the stator. The voltage going through the power winding creates a magnetic field, which is intensified due to the iron core of the stator laminations. The rotor intersects this magnetic field as it is spun past the power winding, thus inducing a voltage in the rotor winding. Once current flow is present in the rotor winding the rotor has been flashed.
If flashing the field does not make the generator work, you may have additional problems, besides a lack of magnetism in the rotor. Further testing will be needed. Hopefully, this will give a simple way to field flash your generator if needed - Bruce Perrault

Apr 27, 2010 | Coleman Powermate Powermate 5000W...

1 Answer

Generator starts with and runs great, but theres no current on my toy hauler


Johnny,

If generators are not used regularly, they need the their magnetic field to be charged (or flashed). This can be done by plugging an electric motor into the socket while the generator is running and spin the motor by hand. The hand-spun motor will push some electric current back into the generator and magnetize it enough to start it.

Look in the manual. There is likely something about field flashing the magnetic field2.gif. The easiest way to do this is to.
1) start the generator
2) plug an electric drill into the generator (without drill bit)
3) make sure drill is set to forward direction (if a reversable drill.
4) pull the trigger on the drill.
5) If the drill does not start, spin the drill's chuck clockwise (When looking down at the chuck from the drill bit end). Spin counter-clockwise if holding it like a pistol and pointing away from yourself.
6) Do this several times (hard) until the the generator will kick in and suddenly make the drill spin at full speed.
Be careful not to drop the drill or poke someone with it as you celebrate success.

Nov 16, 2009 | Guardian Rv Generator 4800 Watt, Gasoline,...

1 Answer

My generator runs but does not prouduce electricity


The basic cause is the rotating magnetic field has collapsed.

Causes of that can include blown rotating diodes, blown regulating capacitor, loss of magnetic remanence.

Search google for things to try. IF it is only loss of the small bit required magnetism, SOME have found plugging in an electric drill that DOES NOT have a throtle speed control and spining the drill with it switched on will create enough field to start the unit generating. Blown diodes or capacitor requires replacement of parts.

If the unit is a permanent magnet type (usually only small units) then there would be open circuit in the wiring or the rotor has somehow lost the magnetism.

SOME units have brushes to excite the field with a direct current. Loss of brush contact to the slip rings or the rectifier supplying the current will cause no output of the generator.

In your case, the Dewalt DG6000 is a brushless type. The most probable cause for the problem is the regulating capacitor. IF the unit has been overloaded or a short placed on it, then the rotating diode(s) have probably been shorted. Searching google you will find that there is a method using light bulbs in series from utility pwer to attempt recharging the rotor. This will ONLY work if the parts have not been damaged.

Oct 26, 2009 | Dewalt DG6000 Heavy Duty 6000 Watt Gas...

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