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HOW TO USE MULTIMETER PDF

Friday, June 21, 2019


This tutorial will show you how to use a digital multimeter (DMM), We will be using the SparkFun VCL throughout the tutorial, but these methods should. Make Magazine's Bre & Joey Grand on how to use a multimeter You can always use a resistance-tester (ohmmeter) to figure out if something. Otherwise reverse movement of the pointer can damage an analog multimeter. It is therefore necessary to use each type to its best advantage. Digital Multimeter.


How To Use Multimeter Pdf

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Perhaps the most important tool you'll use in troubleshooting auto electrical systems Basic multimeters measures voltage, current and resistance, while. In this post we're going to show you how to use a multimeter. This post is mostly addressed for beginners who are starting out in electronics and. [1] SAFETY PRECAUTIONS. This instruction manual explains how to use your new digital multimeter PS8a safely, Before use, please read this manual.

How to Use a Multimeter.pdf

It would be impractical to feed very high currents through a meter because normal 4 mm sockets and test leads wouldn't be capable of carrying high currents without overheating. Instead, clamp meters are used for these measurements. Clamp meters as the name suggests , also known as tong testers, have a spring loaded clamp like a giant clothes peg which clamps around a current carrying cable. The advantage of this is that a circuit doesn't have to broken to insert a meter in series, and power needn't be turned off as is the case when measuring current on a standard DMM.

Clamp meters use either an integrated current transformer or hall effect sensor to measure the magnetic field produced by a flowing current.

The meter can be a self contained instrument with an LCD which displays current, or alternatively the device can output a voltage signal via probe leads and 4mm "banana" plugs to a standard DMM. The voltage is proportional to the measured signal, typically 1mv represents 1 amp.

Clamp meters can measure hundreds or thousands of amps. To use a current clamp, you simply clamp over a single cable. In the case of a power cord or multicore cable, you need to isolate one of the cores.

If two cores carrying the same current but in opposite directions are enclosed within the jaws which would be the situation if you clamp over a power cord , the magnetic fields due to the current flow would cancel out and the reading would be zero. This may involve pulling off spade leads or desoldering.

This is important as there may be other resistors or other components having resistance, in parallel with the component being measured. Connect the probes as shown in the photo below.

This is likely to be the ohm range or similar.

Place a probe tip at each end of the component being measured. If the display indicates "I", this means that resistance is greater than can be displayed on the range setting you have selected, so you must turn the dial to the next highest range. Repeat this until a value is displayed on the LCD. This is often indicated by a symbol which looks like a series of arcs of a circle See the photo showing symbols used on meters above.

Connect the probe leads to the meter as shown in the photo below. Place the tip of a probe at each end of the conductor or fuse which needs to be checked. If resistance is less than about 30 ohms, the meter will indicate this by by a beep tone or buzzing sound. The resistance is usually indicated on the display also. If there is break in continuity in the device being tested, an overload indication, usually the digit "1", will be displayed on the meter. Connecting Probe Leads to Check Diodes or Continuity Leads setup to check diodes or continuity Source How to Check Diodes A multimeter can be used to check whether a diode is short circuited or open circuited.

A diode is an electronic one way valve or check valve, which only conducts in one direction. A multimeter when connected to a working diode indicates the voltage across the component. Turn the dial of the meter to the diode test setting, which is indicated by a triangle with a bar at the end see the photo showing symbols used on meters above. Connect the probes as shown above. Touch the tip of the negative probe to one end of the diode, and the tip of the positive probe to the other end.

When the black probe is in contact with the cathode of the diode usually indicated by a bar marked on the component and the red probe makes contact with the anode, the diode conducts, and the meter indicates the voltage. This should be about 0. When the probes are reversed, the meter should indicate a "1" because the diode is open circuit and non-conducting. If the meter reads "1" when the probes are placed either way, the diode is likely to be faulty and open circuit.

If the meter indicates a value close to zero, the diode is shorted circuited.

If a component is in circuit, resistances in parallel will affect the reading and the meter may not indicate "1" but a value somewhat less.

If you have two DMMs, you can measure the voltage and current simultaneously. Alternatively measure the voltage first, and then disconnect the load so that the DMM can be inserted in series to measure current. When any quantity is measured, the measuring device has an influence on the measurement. So the resistance of the meter will reduce current slightly, and give a lower reading than the actual value with the meter not connected.

The safest way to measure the power consumption of an appliance powered from the mains is to use a power adapter. These devices plug into a socket and the appliance is then plugged into the adapter which displays information on an LCD.

Typical parameters displayed are voltage, current, power, kwh, cost and how long the appliance was turned on useful for fridges, freezers and air conditioners which cut in and out.

You can read more about these gadget in my article here: Checking Power Consumption of Appliances With an Energy Monitoring Adapter An alternative way of safely measuring current drawn by an electrical appliance is to make up a test lead using a short piece of power cord with a trailing socket on one end and a mains plug on the other.

The inner neutral core of the power cord could be freed and separated from the outer sheath, and current measured with a clamp meter or probe Don't remove the insulation! Another way is to cut the neutral core, add 4mm banana plugs to each of the cut ends and plug these into the meter. Only make connections and adjust range on the meter with the power off!

Some components such as CDI Capacitor Discharge Ignition modules on vehicles, boats and small engines produce pulses which vary in frequency and can be short duration.

The voltage is proportional to the measured signal, typically 1mv represents 1 amp. Clamp meters can measure hundreds or thousands of amps. To use a current clamp, you simply clamp over a single cable.

Volts, Amps, Ohms - What Does it All Mean?

In the case of a power cord or multicore cable, you need to isolate one of the cores. If two cores carrying the same current but in opposite directions are enclosed within the jaws which would be the situation if you clamp over a power cord , the magnetic fields due to the current flow would cancel out and the reading would be zero.

This may involve pulling off spade leads or desoldering. This is important as there may be other resistors or other components having resistance, in parallel with the component being measured.

Connect the probes as shown in the photo below. This is likely to be the ohm range or similar. Place a probe tip at each end of the component being measured. If the display indicates "I", this means that resistance is greater than can be displayed on the range setting you have selected, so you must turn the dial to the next highest range. Repeat this until a value is displayed on the LCD. This is often indicated by a symbol which looks like a series of arcs of a circle See the photo showing symbols used on meters above.

Connect the probe leads to the meter as shown in the photo below. Place the tip of a probe at each end of the conductor or fuse which needs to be checked. If resistance is less than about 30 ohms, the meter will indicate this by by a beep tone or buzzing sound. The resistance is usually indicated on the display also.

If there is break in continuity in the device being tested, an overload indication, usually the digit "1", will be displayed on the meter. Connecting Probe Leads to Check Diodes or Continuity Leads setup to check diodes or continuity Source How to Check Diodes A multimeter can be used to check whether a diode is short circuited or open circuited.

A diode is an electronic one way valve or check valve, which only conducts in one direction. A multimeter when connected to a working diode indicates the voltage across the component.

Turn the dial of the meter to the diode test setting, which is indicated by a triangle with a bar at the end see the photo showing symbols used on meters above. Connect the probes as shown above.

Touch the tip of the negative probe to one end of the diode, and the tip of the positive probe to the other end.

How to Use a Multimeter to Measure Voltage, Current and Resistance

When the black probe is in contact with the cathode of the diode usually indicated by a bar marked on the component and the red probe makes contact with the anode, the diode conducts, and the meter indicates the voltage. This should be about 0. When the probes are reversed, the meter should indicate a "1" because the diode is open circuit and non-conducting.

If the meter reads "1" when the probes are placed either way, the diode is likely to be faulty and open circuit. If the meter indicates a value close to zero, the diode is shorted circuited. If a component is in circuit, resistances in parallel will affect the reading and the meter may not indicate "1" but a value somewhat less.

If you have two DMMs, you can measure the voltage and current simultaneously.

Alternatively measure the voltage first, and then disconnect the load so that the DMM can be inserted in series to measure current. When any quantity is measured, the measuring device has an influence on the measurement.

So the resistance of the meter will reduce current slightly, and give a lower reading than the actual value with the meter not connected.

The safest way to measure the power consumption of an appliance powered from the mains is to use a power adapter. These devices plug into a socket and the appliance is then plugged into the adapter which displays information on an LCD. Typical parameters displayed are voltage, current, power, kwh, cost and how long the appliance was turned on useful for fridges, freezers and air conditioners which cut in and out. You can read more about these gadget in my article here: Checking Power Consumption of Appliances With an Energy Monitoring Adapter An alternative way of safely measuring current drawn by an electrical appliance is to make up a test lead using a short piece of power cord with a trailing socket on one end and a mains plug on the other.

The inner neutral core of the power cord could be freed and separated from the outer sheath, and current measured with a clamp meter or probe Don't remove the insulation!

Another way is to cut the neutral core, add 4mm banana plugs to each of the cut ends and plug these into the meter. Only make connections and adjust range on the meter with the power off! Some components such as CDI Capacitor Discharge Ignition modules on vehicles, boats and small engines produce pulses which vary in frequency and can be short duration.

A DVA adapter will sample and hold the peak value of the waveform and output it as a DC voltage so the component can be checked to see whether it's producing the correct voltage level.

A DVA adapter typically has two probe leads as input for measuring voltage and either two output leads with banana plugs or a connector with fixed plugs attached for plugging into a meter with standard spaced sockets. The meter is set to a high DC voltage range e.

Important information for anyone using a DVA to check ignition circuits! Fluke also manufacture meters that can capture the peak level of short transients e. The waveform is sinusoidal as in the diagram below and the change of direction of current is known as the frequency and measured in Hertz Hz.Download this PDF book for free to learn mobile phone repairing.

Connect the probe leads as shown in the photo below. You must however set the mode to resistance, volts or current and also connect the probe lead to the proper socket when measuring current.

How to Use a Multimeter to. Fuses used in meters must carry the maximum measuring current of the instrument, but are intended to disconnect if operator error exposes the meter to a low-impedance fault. Plug the black ground probe lead into the COM socket. Typically, an analog meter will have a panel adjustment to set the zero-ohms calibration of the meter, to compensate for the varying voltage of the meter battery, and the resistance of the meter's test leads.

With some force imagine poking a fork into a piece of cooked meat , push the probes onto two exposed pieces of metal. The meter is set to a high DC voltage range e. The components and PCB traces inside the multimeter are designed to take different amounts of current.

ALEXANDRA from California
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