Like the multimeter, the clamp meter has passed through the analog period and into the digital world of. Otherwise noise from everything including a variable frequency drive to compact fluorescent. The jaws are individually wrapped by coils of copper wire. So we have three parts in next three parts under three sub headers how to use, which to buy, how a clamp multimeter works. A clamp on ammeter measures the current on a circuit by measuring the strength of the magnetic field around a single conductor. Because in most cases the transducers are placed on the outside, they do not come in contact with the. To measure current using a clampon ammeter, the following procedure is applied. Clamp meter tong tester is one of the most useful test equipment.
Commercial electric 600a ac digital clamp metercm2033r. The resistance reading of your ammeter will be indicated on a display on the front of the meter. Together, they form a magnetic core during measurements. Page 2 english general specifications electrical specifications klein tools cl600 is an automatically ranging true root mean square function range resolution accuracy 5060 hz trms digital clampmeter that measures ac current via the clamp, 6. Also how does the working of clamp meter compare to that a current transformer any knowledge would be helpful. Use with caution when working above 30v ac rms, 42v peak, or 60v dc. To measure current using a clamp on ammeter, the following procedure is applied. An electrical meter with integral ac current clamp is known as a clamp meter, clamp on ammeter or tong tester. An overview of clamp meter electrical engineering portal. In years past, electricians used test probes rather than a clamp to measure current. This post will discuss tong tester types, operating principle and how to operate it.
A clamp meter is an electrical tester that combines a basic digital multimeter with a current sensor. Clamp meter safety information 3 remove the test leads from the meter before the battery door is opened. A clampon ammeter measures the current on a circuit by measuring the strength of the magnetic field around a single conductor. General technologies corp gtc cm100 1 ma to 100 amps acdc low current clamp meter. Like the multimeter, the clamp meter has passed through the analog period and into the digital world of today. A clamp meter is an electrical test tool that combines a basic digital multimeter with a current sensor.
This field is concentrated by the clamps iron core, inducing a. The craftsman reads in 2 decmal places where the fluke does not. The battery operated portable meter utilizes clampon transducers to measure flow through the pipe wall. Clampon ammeter or simply clamp meter is an instrument that is used to measure the current flowing through a conductor. In essence a dc current means a static magnetic field. Job functions applications key features recommended clamp electrical contractor working on panels and branch circuits measure loads on a branch circuit at a panel including feeder cables. As shown in a figure at left, a hall element is placed across a gap created by cutting off part of the transformer jaws.
How does a clamp meter work, how does a dc clampmeter work. A clamp meter usually measures to the nearest tenth or hundredth of a unit, rather than in the milliunits available with a dmm. Klein tools 600 amp ac true rms autoranging digital clamp meter with temp. Nutral wire can be measured by using clamp meter, if there is a current passing through the wire, we got a reading in the clamp meter i. Meter basics both wetted sensor and clamp on meter types send ultrasonic pulses across the. 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. Hall effect sensors sense the magnetic field caused by current flow which causes a small voltage across. If an ammeter is of an ac type, then the direction of current has no importance and no polarity marks are needed on the meter. Great choice if you need a professionalquality clamp meter. But, the meter is still connected in series fashion with the circuit for which the current is being computed. Clamp on type ultrasonic flow meter smartmeasurement.
It is an easy to use test equipment and is useful in the measurement of a liveconductor without damaging powering down the circuit. An ac clamp meter basically consists of a current transformer in its jaws, bar ct usually. Hence, a conventional clamp meter will register no reading. Ammeter definition and working principle electrical. Previously we discussed about how to use a normal multimeter. Onicon f4400 portable clampon ultrasonic flow meter is the ideal tool for testing and validating flow. The replacement must be test leads in good working condition with the same or equivalent rating. Well made, tested dc amp readings against a fluke dc amp meter and the craftsman was right on. 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. 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. 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. They are rugged enough for the most demanding work environments and will withstand both dust and water. In order to use a clamp meter, only one conductor is normally passed through the probe.
We offer a range of clampon meters to meet your need with economical and competitive pricing. A clamp meter is an electrical tester that combines a voltmeter with a clamptype current meter. Together both of them forms a magnetic core which actually does the measurements. 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. When the magnetic field flux comes to that small air gap in the tips of the jaw, the field must jump that gap. You stake your reputation on your ability to get the job done, be sure your clamp meter is working for you not against you.
The clampon can later be installed in the field setting and compared to the custody meter to identify shifts between the two meter relationship at the flow lab. With advanced performance, the amp clamp meter line is designed to be simple to use and gimmickfree. Our clampon meters are designed, manufactured and tested to iiecen 61010 and 2032, 600v v, catii, iii and iv standards model dependent. Built on success, digital clamp meters designed by fluke are known as workhorse current clamp meters. Their basic operation is like that of a transformer. Though the clamp is designed solely for current measurement, most clamp meters accept input from test leads or other probes which greatly increases the types of measurements of which they are capable and making the clamp meter a much more versatile instrument. Safety rated at v cat iv, they are safe to operate in all electrical environments. Etekcity autoranging clamp meter, digital multimeter with amp,volt,ohm,diode and resistance test, model. Digital electrical tester, acdc clamp meter, autoranging. A clamp meter is a tool for measuring current on a wire. The ultrasonic flow meter provides numerous advantages over other types of flow measuring meters. Current flowing through the conductor generates an alternating magnetic field that rotates around it.
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. Marketplace at is a community of sellers working with sears to provide you with millions of additional items. Open the jaws and clamp them around the conductor under test. Clamp meter working how to use a clamp meter to measure. Basic theory of clamp meter to measure rms of current wave. Astroai digital clamp meter, trms 6000 counts multimeter volt amp ohm meter with manual and auto ranging, continuity. Only one conductor is normally passed through the probe. A dc clampmeter works on the principle of the hall effect. Having a hinged clamp jaw integrated into an electrical meter allows users to simply clamp around wire, cables and other conductors at any point. The easiest way to measure ground resistance using clamp. Clamp meters using current transformer for ac measurement current transformer clamp meters are equipped with rigid jaws of made of ferrite iron. We have explained the working principle and buying guide too. Dc clamp meters work on the principle of the hall effect. 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.
It gets rid of the unnecessary procedure of breaking the circuit to measure current. Craftsman 400a acdc true rms clamp meter well made, tested dc amp readings against a fluke dc amp meter and the craftsman was right on. 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. Use extreme care when working around bus bars and bare conductors. Please reduce your quantity or change your pickup store to check stock nearby. You may have to adjust the power range before it can read the low level of a working fuse.
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. Fundamental principles of clamp on ultrasonic flow meters overview of selection, installation, operation and maintenance of clamp on meters. A clamp allows you to measure current without breaking the circuit and. What is the working principle of taung tester clamp meter. In particular, conventional current flows into the positive terminal for an upscale meter deflection as shown in above figure. View and download klein tools cl800 instruction manual online. Etekcity autoranging clamp meter, digital multimeter with amp,volt,ohm,diode and resistance test. Users can be sure of working in total safety with v cat iv ratings. 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. If an ammeter is of dc type, then it has polarity signs on it for ensuring appropriate connection for an upscale indication.
In essence a dc current means a static magnetic field, and by faradays law, no voltagecurrent is induced. It includes a noncontact voltage tester integrated into the clamp, and. The commercial electric digital clamp meter cm2033r features solid structure and rubber shell. The flow of fluid is measured by clamping a set of transducers on a pipe. Before we go into indepth explanations on how you can measure dc amps with a clamp meter, we would begin by giving a summary of the dc amp and the clamp meter, so you have an understanding of how they relate talking about electricity without mentioning current would be difficult, current is the flow of electricity through a circuit or a conductor, and it is measured in ampere.
Always press the zero button before placing the clamp around a conductor to take a new measurement. Clamp meters working principle instrumentation tools. Ammeter definition and working principle electrical academia. 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. Work horse clamp with increased performance and flexibility 373 truerms ac clamp meter the new fluke 373 clamp meter offers improved performance perfect for many ac only current measurement situations. These clamps are independently wrapped up with copper coils. Examine the test leads for damaged insulation or exposed metal. The clamp ground tester is clamped around one of the electrodes and then measures the resistance of the entire loop. Prolevel item has big jaws, provides fast readings, and can be used for a wide array of electrical applications. Klein tools cl380 electrical tester is an automatically ranging true root mean squared trms digital clamp meter that measures acdc current via the clamp, acdc voltage, dc microamps, resistance, continuity, frequency, capacitance, and diodes via test leads, and temperature via a thermocouple probe. How can a clampmeter measure ac and dccurrent without interrupting the circuit. Digital clamp meter, true rms measurement technology, v, 2000a, 60m 48 pages measuring instruments klein tools cl312 instruction manual 400a ac autoranging digital clamp meter true rms measurement technology 600v,400a,40m 29 pages.
Before use, verify the meters operation by measuring a known voltage. Designed by electricians for electricians, this klein tools clamp meter measures both ac and dc currents up to 400 amps with accurate true rms readings. First, make sure your clamp meter reports the truerms reading. This guide, clamp multimeter how to use for dummies is an illustrated guide on measuring current on a wire of a gadget. It is designed for use with pipes ranging from 2 through 48 in diameter, and it works with most commonly used pipe materials. The remaining ground electrodes are all in parallel, and, as a group, are in series with the ground electrode being measured. Meter basics both wetted sensor and clampon meter types send ultrasonic pulses across the. If you have limited use for a clamp meter, though, you might look for a less expensive unit. With truerms ac voltage and current measurements, the fluke 373 reads up to 600 a ac and 600 v ac or dc. In contrast to a multimeter, the clamp meter does not need to be connected to the circuit in order to read current. Klein tools 400 amp autoranging acdc digital clamp meter.
Introducing tecpel 3 34 digit clamp meter, 040a, 0400a, for current measurement from multimeter clamp on meter taiwan quality manufacturer. What i have in mind is that wire creates the changing flux that induces voltage in the meter. When servicing the meter, use only specified replacement parts. The meter meets gbt 97892 digital multimeter general. Fundamental principles of clampon ultrasonic flow meters. Lessexpensive clamp meters use a rectifier circuit which actually reads mean current, but is calibrated to display the rms current corresponding to the measured mean, giving a correct rms reading only if the current is a sine wave. The fluke 373 clamp meter the meter measures truerms ac and dc voltage, ac current, resistance. A clamp meter is an electrical tester that combines a voltmeter with a clamp type current meter. In general hall elements are used as a sensor to detect dc current because it is not possible to employ an. 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. Most ammeter fuses can be easily replaced or reset, though this process will. An electrical meter with integral ac current clamp is known as a clamp meter, clampon ammeter or tong tester. Utilizing the principle of current transformer, the reading will be displayed. What is clamp meter tong tester types, operating principle.
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