Of course, a clampon may not provide the accuracy you need, so make sure you know your process requirements before buying. Fundamental principles of clampon ultrasonic flow meters overview of selection, installation, operation and maintenance of clampon meters. Hence, a conventional clamp meter will register no reading. The q meter uses in a laboratory for testing the radio frequency of the coils. Tek clamp 1200a is an ultrasonic clamp on flowmeter are used only for measuring the flow of liquids in closed pipes, e. These clamps are independently wrapped up with copper coils. In electrical and electronic engineering, a current clamp, also known as current probe, is an electrical device with jaws which open to allow clamping around an electrical conductor. The clamp ground tester is clamped around one of the electrodes and then measures the resistance of the entire loop. General clampon meters are specified to achieve two to three per cent uncertainty. Measuring principle of clamp earth tester about details. A clamp meter is a tool for measuring current on a wire.
It is the hall effect that is the theory behind the dc clamp meter. In essence a dc current means a static magnetic field, and by faradays law, no voltagecurrent is induced. So we have three parts in next three parts under three sub headers how to use, which to buy, how a clamp multimeter works. Afterward, adjust the meter dial to the suitable function to dc current or. A digital multimeter dmm is an instrument that can measure several basic electrical quantities and shows the measurement with a number in a display. Lab testing has demonstrated most installations perform at an accuracy level range of 1%. Manufacturers cannot control the quality of a given field installation and must provide latitude. Since some states or countries do not allow the exclusion or limitation. An ac clamp meter basically consists of a current transformer in its jaws, bar ct usually.
We have explained the working principle and buying guide too. The manufacturer is not liable for damage caused by improper or nondesignated use. Steps for measuring ac or dc current using a clamp meters jaws. System10 btu meter manual 0918 065124 18323 page 2 safety information this meter was calibrated at the factory before shipment. Anammeterisalwaysconnectedin serieswiththeelementinquestion. An electrical meter with integral ac current clamp is known as a clamp meter, clamp on ammeter, tong tester, or colloquially as an amp clamp. The transducers are a noncontacting, clampon type, which will provide benefits of non fouling operation and easy installation.
The easiest way to measure ground resistance using clamp. So, although the ground system had low earth ground resistance values when initially installed. An ammeter the name is a contraction of amperemeter is a device for measuring the electric current through a wire or a circuit element. Features the sensor of ultrasonic flowmeter ul330 is clamped on just outside of an existing pipe without any piping modification and time consuming installation work. The remaining ground electrodes are all in parallel, and, as a group, are in series with the ground electrode being measured. How can a clampmeter measure ac and dccurrent without interrupting the circuit. The hall effect, named after edwin hall who discovered it 1879, states that when a conductor carrying current is placed in a magnetic field, a potential is induced across the conductor, transverse to an electric current in the.
An overview of clamp meter electrical engineering portal. In this case, the reading is the current through the resistor and led. Like the multimeter, the clamp meter has passed through the analog period and into the digital world of today. Even though there are several designs of ultrasonic meters on the market today, the principle of operation remains the same. Clamp meters using current transformer for ac measurement current transformer clamp meters are equipped with rigid jaws of made of ferrite iron. The hall effect, named after edwin hall who discovered it 1879, states that when a conductor carrying current is placed in a magnetic field, a potential is induced across the conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current. Because in most cases the transducers are placed on the outside, they do not come in contact with the. The main principle of ammeter is that it must have a very low resistance and also inductive reactance. Of course, a clamp on may not provide the accuracy you need, so make sure you know your process requirements before buying.
Jun 08, 2019 ammeter means ampere meter which measures ampere value. Together, they form a magnetic core during measurements. Basic theory of clamp meter to measure rms of current wave. Ammeter working principle and types of ammeter electrical4u. In particular, conventional current flows into the positive terminal for an upscale meter deflection as shown in above figure. By adopting a dsp and an ad converters, the flow measurement has been speeded up, and. Turbine measuring principle a turbine flow meter is constructed with rotor and blades that use the mechanical energy of the fluid to rotate the rotor in the flow stream.
Ammeter definition and working principle electrical academia. Clampon ammeter or simply clamp meter is an instrument that is used to measure the current flowing through a conductor. The ultrasonic flow meter provides numerous advantages over other types of flow measuring meters. Browse online, or one of our applications engineers can help. Digital multimeter working principle electrical academia. A clamp meter is an electrical test tool that combines a basic digital multimeter with a current sensor.
Digital clamp meter digital clamp meter if the casing is not covered properly, screws are not tightened, do not put it to use. Hall effect clamp meters can measure both ac and dc current up to the kilohertz. Clamp on type ultrasonic flow meter smartmeasurement. Job functions applications recommended clamp commind electrical electrical contractor working on panels and branch circuits measure loads on a branch circuit at a panel including feeder cables, branch circuits and neutrals and the continuity of switches, fuses and contacts. Having a hinged jaw integrated into an electrical meter allows technicians to clamp the jaws around a wire, cable or other conductor at any point in. The main advantage provided is ultrasonic measurements are noninvasive. Also how does the working of clamp meter compare to that a current transformer any knowledge would be helpful. Dosto maine aapse share kiya hai ki clamp meter kya haiy kayse kam karta haiy ummind haiy ki ye video aapko pasand aayega subscribe technical gyan.
This allows properties of the electric current in the conductor to be. Together both of them forms a magnetic core which actually does the measurements. The jaws are individually wrapped by coils of copper wire. An electrical meter with integral ac current clamp is known as a clamp meter, clamp on ammeter or tong tester. Astroai digital clamp meter, trms 6000 counts multimeter volt amp ohm meter with manual and auto ranging, continuity. A useful meter for measuring alternating and direct current is the clamp meter, which does not require the circuit to be broken to insert the meter. Keep in mind, an ultrasonic flow meter can do complex as well as simple measurements. To ensure correct use of the meter, please read this manual thoroughly. Voltmeter working principle if an ammeter is of dc type, then it has polarity signs on it for ensuring appropriate connection for an upscale indication. Current transformer clamp meter tong tester operating principle and how it works a current transformer based tong tester clamp meter consists of two clamps made of ferrite iron. Ultrasonic flow meter ultrasonic meters are velocity meters by nature. Before you use met2, read this instruction manual completely and understand yourself thoroughly with all functions. Principles and testing methods of earth ground resistance. A multimeter is a musthave tool for someone working with electricity and electronics.
How does a clamp meter work, how does a dc clampmeter work. Figure 1 ultrasonic meters are velocity meters by nature. Originally created as a singlepurpose test tool, modern clamp meters offer more measurement functions. Jun 05, 2016 ammeter means amperemeter which measures current. Description details type clamp on ultrasonic flow meter flow measurement method transit time method accuracy 2% of reading channel options single channel.
To test for current, determine the type of current if it is ac or dc. Like current transformer types, hall effect clamp meters use rigid iron jaws to. An electrical meter with integral ac current clamp is known as a clamp meter, clampon ammeter or tong tester. Ammeter definition and working principle electrical. Using ultrasonic transducers, the flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and against the direction of the flow. Principle ultrasonic water meter is designed to measure the fluid velocity of liquid within a closed conduit. Poor grounding contributes to downtime but a lack of good grounding is also dangerous and increases the risk of equipment failure. Mar 05, 2017 this guide, clamp multimeter how to use for dummies is an illustrated guide on measuring current on a wire of a gadget. It is always necessary to verify values, to measure voltage, current, and resistance values in a circuit for diagnostic purposes, or to identify a damaged component.
Blades on the rotor are angled to transform energy from the flow stream into rotational energy. Previously we discussed about how to use a normal multimeter. Over time, corrosive soils with high moisture and salt content and high temperatures can degrade ground rods and their connections. In general hall elements are used as a sensor to detect dc current because it is not possible to employ an. What is clamp meter tong tester types, operating principle. It gets rid of the unnecessary procedure of breaking the circuit to measure current. Fundamental principles of clampon ultrasonic flow meters. Jan 16, 2018 ultrasonic water flow meters measure the speed of fluid passing through the pipe using ultrasound to measure the volumetric flow. Ammeter means amperemeter which measures ampere value. The resonance is the condition exists in the circuit when their inductance and capacitance reactance are of equal magnitude. Prolevel item has big jaws, provides fast readings, and can be used for a wide array of electrical applications. In order to use a clamp meter, only one conductor is normally passed through the probe.
In contrast to a multimeter, the clamp meter does not need to be connected to the circuit in order to read current. From clampon devices to multipath inline flowmeters. Press this key again, the meter will return to normal mode. For process and utility applications, energy and custody transfer ct measurements. An ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. What i have in mind is that wire creates the changing flux that induces voltage in the meter. Clamp meters working principle clamp meters using current transformer for ac measurement current transformer clamp meters are equipped with rigid jaws of made of ferrite iron.
Megger working principle is based on the working principle of movingcoil instruments, which states that when a currentcarrying conductor is placed in a magnetic field, a mechanical force is experienced by it. Portable ultrasonic flowmeter, ultrasonic flow meter, clampon typeultrasonic flow transducer manufacturer supplier in china, offering tds100 handheld ultrasonic flowmeter portable ultrasonic flowmeter, stainless steel float ball for floating water level. Electromagnetic flowmeter,vortex flowmeter,turbine flowmeter. Some can also measure other electrical quantities such as frequency or even temperature. In a transittime ultrasonic liquid flow meter, an ultrasonic signal is transmitted in the direction of the flowing fluid downstream, and then another signal is transmitted against the flowing fluid upstream. Tds100 handheld ultrasonic flowmeter portable ultrasonic. High temperature and cryogenic versions, variants for high pressure and higher viscosities. Clamp meter tong tester is one of the most useful test equipment. The advantage of using clamp meter is that measurements can be obtained even without opening the test circuit.
It also explains the properties of the coil and capacitor. Great choice if you need a professionalquality clamp meter. Proper protective equipment must be worn before testing can be done. This post will discuss tong tester types, operating principle and how to operate it. Current transformer clamp meters are equipped with rigid jaws of made of ferrite iron. By adopting a dsp and an ad converters, the flow measurement has been speeded up, and the resistance to bubbles has been improved. If you want nonintrusive technology, a clamp on ultrasonic flow meter can be an ideal choice. Etekcity digital multimeter amp volt clamp meter voltage tester with ohm, continuity, diode and resistance test, autoranging, red, msrc600 4. Ultrasonic meter basics ultrasonic gas flow meters operate on the transittime measurement principle. Keep fingers behind tactile barrier on face of meter.
A clamp meter measures the vector sum of the currents flowing in all the conductors passing through the probe, which depends on the phase relationship of the currents. A dc clampmeter works on the principle of the hall effect. It has very low impedance because it must have very low amount of voltage drop across it an. I understand that for ac clamp meters, a changing magnetic field induces a voltagecurrent in a wire loop and therefore it is possible to measure ac currents by induction. The q meter measures the quality factor of the circuit which shows the total energy dissipated by it. What is the working principle of taung tester clamp meter. This allows measurement of the current in a conductor without the need to. In general hall elements are used as a sensor to detect dc current because it is not possible to employ an electromagnetic induction method as used for dedicated ac clamp meters. They induce energy which is oscillating between the electric and. As shown in a figure at left, a hall element is placed across a gap created by cutting off part of the transformer jaws. Introducing tecpel 3 34 digit clamp meter, 040a, 0400a, for current measurement from multimeter clamp on meter taiwan quality manufacturer.
Working principle of speedometer is the torque of the motion of the wheels is read through a meter and is visible to the user. Premeasurement steps to avoid electrical shock or personal injury. If you have limited use for a clamp meter, though, you might look for a less expensive unit. This guide, clamp multimeter how to use for dummies is an illustrated guide on measuring current on a wire of a gadget. Having a hinged jaw integrated into an electrical meter allows technicians to clamp the jaws around a wire, cable or other conductor at any point in an electrical system, then measure current in that circuit without. When the magnetic field flux comes to that small air gap in the tips of the jaw, the field must jump that gap. Digital multimeter working principle electrical a2z. The meter is connected in series with the components by breaking the circuit.
All multimeters measure ac and dc voltage voltmeter, ac and dc current ammeter, and resistance ohmmeter. This field is concentrated by the clamps iron core, inducing a. Utilizing the principle of current transformer, the reading will be displayed. An electrical meter with integral ac current clamp is known as a clamp meter, clampon ammeter, tong tester, or colloquially as an amp clamp. When it is not in use for a long time, please remove the battery and avoid storing it in the place with high temperature and humidity. Fundamental principles of clamp on ultrasonic flow meters overview of selection, installation, operation and maintenance of clamp on meters. Current flowing through the conductor generates an alternating magnetic field that rotates around it. Turn the dial to the proper function, either a ac or a dc. A basic multimeter can measure the three basic electric values i.
The specification of clampon flow meter used for this study is given below. Although volumetric flow under nominal conditions may be accurately calculated, the process conditions and fluid properties can vary sufficiently such that it is questionable if the measured volumetric flow rate or derived using velocity represents the required mass flow rates. Clamp meter in electrical and electronic engineering, a current clamp or current probe is an electrical device having two jaws which open to allow clamping around an electrical conductor. Comprehensive portfolio for gases, liquids and steam. Even though there are numerous designs on the market today, the principle of operation remains the same figure 1. A clamp meter is an electrical tester that combines a voltmeter with a clamp type current meter. The performance of the meter for different straight lengths is tabulated in table 7 to 9. As current flows through a conductor being measured, the iron core formed by the jaws of a hall effect clamp meter allows the magnetic field to easily pass throughmore easily, in fact, than air. If you want nonintrusive technology, a clampon ultrasonic flow meter can be an ideal choice. Only one conductor is normally passed through the probe. Ceesi measurement services garner, iowa this paper is aimed at ultrasonic natural gas meters that use transit time across the gas pipe as the measurement variable. It is often very difficult to measure the current directly, since the value of the current is too large to apply it directly to the meter circuit, or simply because it. The flow of fluid is measured by clamping a set of transducers on a pipe.
It is an easy to use test equipment and is useful in the measurement of a liveconductor without damaging powering down the circuit. Clamp meters working principle instrumentation tools. General technologies corp gtc cm100 1 ma to 100 amps acdc low current clamp meter. The fluke 373 clamp meter the meter measures truerms ac and dc voltage. Clampon ammeter or simply clamp meter is an instrument that is used to measure the current.
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