The Rescale field on a Teledyne LeCroy HDO4104 would have 1 or 10 Units/Volt entered, respectively. Keysight 1147B Current Probe, AC/DC, 0 to 50 MHz, 15 A, for InfiniiVision, Infiniium Series 20970.1 MFG #: 1147B 1 Its a split core in a plastic case that latches. I'd like to know if anyone could help or make a . Figure 4: Low-level oscilloscope traces often show quantisation noise on input signals. While low compared to a traditional passive, it is suitable for probing digital signals. Would an AC filter toroid work? Measuring current is not as straightforward as measuring a voltage. These connections have a significant length of unshielded connecting leads, particularly the ground lead. Is this correct? It is built around two popular integrated circuitsIC1 and IC2. If you want to see how the big boys do it, Keysight had a good break down last year. There are several factors which you should take into consideration. Tektronix current probe solutions offer: The broadest range of AC/DC and AC-only current probes. x10, x100) because the resistive divider (probe+scope input) has parasitic capacitances that you need to trim to give a flat frequency response. Is it for limiting the current out of low frequency signals? The usual practice involves the use of an isolation transformer to supply the SMPS and to make the measurements with the oscilloscope with normal probes, keeping its grounding as well. I soldered its probe, which is just 16ga wire, to the item being measured so that my hands wouldn't pick up any stray RF. The coil AROUND the wire under test? A single 0.1" male header pin will work well as a simple probe tip. After calibration, it did just fine. Set the oscilloscope's input termination to 50. This then tries to keep the core at zero flux at low frequencies which helps remove the core and hall sensor nonlinearities. What kind of factor of the probe may curb on the frequency of the current. Teledyne LeCroy current probes are available in a variety of models for a wide range of applications. Passive probes Fig. The RP1001C current probe enables a general purpose oscilloscope to display AC and DC current signals upp too 100A Peak (70A RMS). The probe can be used as a bnc connector to plug into an electrical current, probe and bnc connector. 7 GHz Bandwidth Active Probe for the DS70000 Oscilloscope. I bought some EZ-Hooks from digikey (see second picture) that connect right onto the female header. See Figures 1 and 2 below. If the probe draws too much sense current, then the probe will change (sometimes drastically) the operation of the target circuit. Then put some heat shrink tubing on there to strengthen everything up and insulate the connection. Even the "low-bandwidth" probes were still around 1GHz of bandwidth. The builder warns that you shouldn't exceed 5V on the Arduino pins to avoid damage. Most oscilloscopes have BNC-type connectors; SMA is another possibility. Even if you bought everything and used a non-printed case, we would be hard-pressed to think youd spend more than $25. Figure 4 shows typical display of a 1000:1 50 probe. You can make two probes this way, so it's quite nice. Now to add some tips that can connect to clips, probes, headers, etc. Wire (~24AWG, I used solid core breadboard wire)Female headers (0.1")Male headers (0.1"). Of course it's also nice to use the female headers because you can connect them directly up to male headers on boards that you are debugging. Most oscilloscopes only directly measure voltage, not current, however you can measure current with an oscilloscope, using one of two methods. 2006-07-17 5:42 am. Enjoy your new non-crappy probes! 2011-01-14 8:00 am. Constructing the DIY oscilloscope probe is straightforward with shabaz's instructions. What I want to know is how many frequency of the current can be measured with this clamp probe. Angelina Tsuboi has added a new project titled WiCon Kit. DIY ceiling-mount roller blind for green screen? The supplies needed are a piece of RG-178 coax, a BNC connector, a 950 ohm resistor, some wire, and hot glue. Figure 3: Simplified schematic of the n:1 voltage probe shows a series resistor RS that requires some calculations to find its value. And if I duplicate his work exactly, Im hacking! I've been playing with hall-effect sensors lately, and there are analog output devices that have known Gauss-to-voltage curves, so you can build one of these, with a coil to wrap around a conductor, and get voltage reading to scope probe from which you can calculate current values. The input termination setting of the oscilloscope scope should be 1M. Here, the signal travels through the cable at approximately 0.67 times the speed of light. IVAN liked Not-so-smart capacitive discharge spot welder. A DIY Fluxgate Magnetometer based Current Probe - [ Link ] In addition, the common probe's connection to the signal source can cause distortions. It has not been fully characterized but the initial results are reasonably promising. You should also consider making a few leads for various situations. And really, it looks relatively flat. 150 MHz Passive Probe with 1x:10x selector . Share it with us! Sep 3, 2014. . The average oscilloscope probe has a bandwidth of less than 300MHz. A Free & Open Forum For Electronics Enthusiasts & Professionals, Login with username, password and session length. Power rail probes are designed to measure small AC characteristics of DC power rails. 0 Members and 1 Guest are viewing this topic. Wire strippers/cutters Weve seen other homebrew builds for current probes and some of them are very accurate. Furthermore, high-frequency voltage probes often cost over $12,000 and slightly better current probes start at $4,000. Use the probe identification feature to automatically configure the oscilloscope for probe attenuation. DIY Soundcard Oscilloscope probe? Neither of the inputs are referenced to ground, so the probe will only compare them to each other, then output a signal that your oscilloscope can use. The oscilloscope is based on the STM32F103 microcontroller which has 2 fast, 12-bits ADC and it samples the signal to be examined (after it has passed condition . The clamp surrounds the wire, so you don't need to break the connection to take your. Learn more, https://www.amazon.com/dp/B07YJWGFKZ/?coliid=I1PC8MM7SUFKU2&colid=1Y1FG92OMK4E8&psc=1&ref_=lv_ov_lig_dp_it. Its power dissipation should not exceed 0.25W. I bought a cheap hantek one - it works pretty well. In addition to building a homebrew probe, the video also shows a teardown of a Hantek current probe and explains the theory behind the different kinds of current probes, including some tricks like using a compensation winding to prevent core magnetization. Next step is the tips! The edge rate can easily be around 100 ps, which is . Make it look like the third picture. Without these devices, it would be very diffficult to work in the power applications field, but they are pricey, though. Login to post a comment. So you need a resistor with 100m. This Week In Security: OpenSSL Fizzle, Java XML, And Nothing As It Seems, MoCA Networking Is A Niche Solution For Coax Lovers, Make Your Pi Moonlight As A Security Camera, How Those NES DIP Chips Were Reduced To QFNs, Commodore Datasette Does Its Own Calibration. IVAN liked Bloft Mk2 - 3D printer for plastic waste. 1: Equivalent-circuit diagram input impedance probe. more bits of the oscilloscope's ADC), resulting in a more accurate . If you have a fair junk box (and a 3D printer), this probe could be made very inexpensively. I got rush shipping, and as soon as I got my tracking number and a guaranteed delivery date, I promised my . U=R*I. In the first four screenshots the yellow trace is the output of the DIY differential probe, multiplied by 10 by the scope, as connected in the diagram. Depending on your scope/current, you won't even need an opamp. Materials: If it was something totally new, that would be inventing, but someone then copying it to have their own would be hacking! Or is it just for creating a 20x probe (1k/50R = 20)? As modern power supplies edge upward in operational frequency, engineers have started to migrate to high-frequency power switch and rectifier technologies. One technique is to measure the differential voltage drop . Ive got lots laying around and theyre already wound on both sides. It uses a standard BNC interface and is suitable for most brands of oscilloscopes.It can also be used for multimeters via connector. A 46in (1015cm) ground lead can pick-up radiated noise from the circuit or other sources and inject it into the coax cable as a common-mode signal. Substituting current should pass across a guide for transformer activity to happen. You could always improve it. Figure 5: The basic construction of an n:1 50 Probe includes a 1/4 W resistor near the tip. My physics prof taught us the 'right hand rule' which is useful for figuring out the polarity of a coil given current direction, but when applied to a straight wire, I'm lead to believe the lines of flux just do a loop around the wire. Surely the best brand for maintenance. The signal may only be acquired by the ADC's lowest four bits of the ADC (assuming an 8-bit ADC). Are you thinking about a small probe for sniffing magnetic fields around a PCB trace, or for measuring high current stuff such as the other posts mentioned here? The sensor uses a ferrite core and a hall effect sensor. That is, not to a ground that has a long PCB trace length between the probe and the node of interest. Power dissipated within the series sense resistor (RS). Pliers It also means the winding itself does the transformation at high frequencies so youre not limited by the bandwidth of the opamp. To make this DIY oscilloscope, you'll need an Arduino Leonardo/Arduino Micro, two crocodile clamps, and a PC with processing. The Oscilloscope current probe adapter is an excellent accessory to go with any oscilloscope, the type of connections onboard are perfect and it seems to be extremely responsive. This is not as straightforward as you might think. An optional but helpful material is polydoh. Suppose you want a permanent probe. Electronics Asia Conferencevirtual conference and exhibition 18 Oct. 2022! The Micsig CP2100A Oscilloscope Probe is a current probe that can measure both DC and AC. That power rating sets the maximum current that can enter the oscilloscope's input. Measure the voltage dropped across a shunt resistor: Some power supply designs may have shunt resistors built into the design for feedback. Learn how your comment data is processed. #3. The probe is suitable for oscilloscope, can be used in high voltage applications such as circuit board tuning and probeing, etc. The length of the unshielded centre conductor and the shield pigtail should be kept to less than 1in (25cm) to minimise noise pickup. Because the primary is not an ideal one turn, its final accuracy will be addressed during its final calibration. 2008-06-07 9:54 am . Construct a known, quiet, high frequency signal path from the circuit to the oscilloscope. These used to be expensive, although weve seen some under $100, if you shop. This probe only provides high frequency signal shielding from the target circuit to the oscilloscope. In the picture below you can see that they look really good and I can attest that they work a heck of a lot better than my 'paper clip and alligator patch cable' setup I was using before! When the probe is clamped over the conductor or cable in which current is to be measured, the conductor forms the primary winding. Note that it helps later on when you use yellow/red as the signal wire and black/green as the ground wire. A very useful tool for troubleshooting EMC issues is the near field probe. Current probes in oscilloscopes Current probes in oscilloscopes are partitioned into two classifications: Probes for detecting AC current Current probes (AC/DC) The two variants utilize the transformer activity idea to identify exchanging current (AC) in a guide. The product is a multimeter with true rms, accurate measurement and display functions, and has high reliability. Oscilloscopes, also called Digital Storage Oscilloscopes (DSOs) or Mixed Signal Oscilloscopes (MSOs), are a common type of test instrument used to capture, analyze, and troubleshoot electrical or real world physical signals. fixable? Don't cut into the inner insulation! Ensure the probe's input connector matches the connector on your scope. The only 2 things that would be good to change would be optional simple acrylic case similar to those available for the bus pirate. The current probe in Figure 11 , is essentially a 1:n forward-mode transformer with a high leakage turn primary. That doesnt mean there isnt anything neat to read about under the sun. The only products with 3rd Party Safety Certification (UL, CSA, ETL) Passive probes are the most commonly used probes for oscilloscopes. 1. I wonder why the 953 ohms resistor is needed, won't it reflect any signals entering the 50 ohm, instantaneous impedance, coaxial cable? Next: Noise considerations for DIY oscilloscope probes , New products & solutions, whitepaper downloads, reference designs, videos. Does it work? John Smith liked Raspberry Pi SDR Cyberdeck. This probe is a bit more complicated to construct. It's split design makes the appearance small and exquisite. Like, how do I know what orientation to put the hall-effect sensor at? Should this work? Due to its small size (compared against antennas) the most common use of these tools is to aid in detection of the source of a particular signal (emission), or as a local field-generating source (immunity), helping you to find weak spots in your device under test. 1. Then solder that onto the end of the wires connected to the cable and put some heat shrink on the connection. you can take a ferrite clamp put like 6 turns of wire around it and use that. The probe has a high input resistance of 10-mega-ohm. MRI story: Are our celebrity priorities misplaced? Note that a scope's ground is usually connected to protective earth. Current Probes Current probes sense the current flowing through a conductor and convert it to a voltage that can be viewed and measured on an oscilloscope. Thread starter laserbeak; Start date 2008-06-07 9:54 am; Jump to Latest L. laserbeak Member. They have served their markets well where the overwhelming number of applications operates at much less than 1GHz. The RF current probe is an "inserted-primary" type of radio frequency current transformer. It is typically nice to choose a decade-multiple resistor reduction ratio, since the displayed v/div setting differ only in the placement of a decimal point from the input voltage. You bet. To view such fast transitions, you typically need an oscilloscope with at least 1GHz bandwidth. Most current probes clamp around an exposed wire and measure the magnetic field generated by the current flowing through the wire. Press question mark to learn the rest of the keyboard shortcuts. Step 3: Multi-Purpose Tips. XY mode the voltage and current and you have a BH curve. The hall effect and a BNC connector are likely to be the most expensive parts. Wireless charger teardown. Will this ferrite core work? B. I enjoyed this video. Tools: PVP2150. But I have future projects where I want to measure closer to 100A, so I'll want a very small resistance to minimize losses and heating. Re: DIY Homebrew Oscilloscope Current Probe, https://www.google.co.nz/search?q=diy+oscilloscope+current+probe&rlz=1C1CHBF_enNZ760NZ760&oq=diy+oscilloscope+current+probe&aqs=chrome..69i57j69i60.5869j0j8&sourceid=chrome&ie=UTF-8, Quote from: Doctorandus_P on May 21, 2018, 07:05:43 am, https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/. I have heard mention that's it's possible to make an el'cheapo oscilloscope current probe from ferrite beads. But I have a question, if someone will teach me my question. Unfortunately, most commercially available voltage and current probes are inadequate at such high frequencies. Its simplified schematic is shown in Figure 3. Solder wick Compensation is required for probes which divide the input vltage (e.g. There are other uses for a differential probe too, it can allow you to . The average oscilloscope probe has a bandwidth of less than 300MHz. Yup pure true to life hacking! Teledyne LeCroy current probes are often used in applications such as the design and test of switching power supplies, motor drives, electric . Furthermore, high-frequency voltage probes often cost over $12,000 and slightly better current probes start at $4,000. I want to plot a BH curve for a few transformer cores I have, so I was going to use my oscilloscope in XY mode to plot current vs magnetic field. Will We Miss You? Its not as pretty as a $100 unit, but beauty is in the eye of the beholder, and we are suckers for homebrew gear so we will say it is certainly more interesting. This noise results in a reduction in ADC input resolution. You will need a 5VDC adapter to power Bud's probe or a 7-12VDC adapter to power Paul's probe, and a SMA to BNC pigtail to connect the probe to the scope. 50Ohm, RG58/Ucoax cable with male BNC connectors (length is up to you, Iused a 2' one)Heat shrink tubing This, along with fancy shielding and compensation, is how the expensive 100MHz bandwidth current probes work. Since capacitive reactance is an inverse, C1 must be equal to the scopes input capacitance DIVIDED by 9, so if the scope has 18pf input the probe parallel cap has to be 2pf. Bye Bye Linux On The 486. #1. An easy way to get more bandwidth and accuracy out of something like this is to put the output winding around the toroid with 100 turns (or whatever ratio youre trying for) and use a higher gain integrator for the op-amp circuit. We will go through the details of the oscilloscope probe anatomy and schematic now. A couple of clamp-on ammeters. This is just as easy as it looks! The equivalent probe tip schematic is shown . A general rule of thumb is: There are instances where the initial considerations are met, but the probe overloads the target circuit. Make it look like the first picture. Of course if we take the line capacitance into account, we will have a higher 'input' capacitance so the parallel cap will come out bigger. John Smith liked 1950s Bakelite Podcast Player. Current Probe CT6711 + Memory HiCorder MR6000 If the signal is too low, the oscilloscope input gain must be set in the <100mV range. $8,799. I wrapped a piece of solder wick around the wire/braid to make it a bit stronger. For today's tutorial, we will build the HS101 Oscilloscope.The HS101 Oscilloscope setup comprises of the HS101 portable and compact DIY oscilloscope, connected to an Android-based mobile phone or tablet running the HScope app.. The oscilloscope's internal 50 terminating resistor becomes the bottom resistor of a resistor-divider circuit. This shunt resistor I got has a resistance of about 75. So that's only a 75mV drop at 100 amps, thus only generating 7.5W of heat. Figure 2 shows the design of a 1:1 shielded probe. You'll end up seeing the quantisation steps of the leas-significant bits (LSBs). Solder This requires an exposed wire in your circuit, and clamp-style probes are generally only accurate down to the milliamp level. I needed to measure 3 phase current for a job recently and didn't have the clamps to do it. The figure below show a full view of a scope probe available in the market. The displayed signal becomes noisy because the input signal is very close to the input amplifier's noise floor. Its new to me, and although I already own a few its pretty cool to see a break down like this, so thanks to HAD. My idea was to use a shunt resistor, and wire in an op-amp to amplify the tiny voltage drop across it so that the oscilloscope sees something like 0.1V per 1 amp flowing through the shunt. There are many types of oscilloscope probes each with its own field of application. Don't worry. To produce the desired channel voltage, a current must pass through the 50 terminating resistor. This is perhaps the simplest way to measure current, and will be discussed here in detail. Then solder that onto the end of the wires connected to the cable and put some heat shrink on the connection. Each probe is connected between the system ground and one end of the current-measuring resistor, and the scope is configured to display the voltage difference between the two input channels. The ferrite toroidis split inhalf, one half in each side of the clamp. The operating frequencies and the edges of new-generation switching transistors are exceeding 1GHz, resulting in rise and fall times in the sub 5 ns range. Definition of Oscilloscope: Oscilloscopes observe the change of electrical signals over time, continuously graphed on a . As illustrated in Figure 2, in such a case the easiest solution is to use two voltage probes and a dual-input oscilloscope. Now the 10:1 signal is multiplied by 10 by the oscilloscope. Designing and building high-frequency voltage and current probes requires a good understanding of RF, parasitics, transmission-line theory and field theory. The transformer cores are your probe. It actually does look lIke the incomplete DIY 10:1 probe is successfully reducing the signal by 10 times, and now the signal has a clear shape, but it clearly is a different shape from the original signal. DIY dot grid on black paper? The probe has dual sensitivity ranges, either 1 volt/amp or 100 millivolts/amp. The clamp-on feature of this probe enables easy placement around any conductor or cable. https://www.amazon.com/dp/B07YJWGFKZ/?coliid=I1PC8MM7SUFKU2&colid=1Y1FG92OMK4E8&psc=1&ref_=lv_ov_lig_dp_it That's it, all done. By constructing custom 50 voltage probes, you can better define and understand what is really happening within the circuit. If you want to measure more than 5V, you'll have to add voltage dividers. We dont know if it was cost or principle that motivated [Electronoobs] to build his own current clamp, but he did. Im not sure the characteristic of the probe. The transformer current is measured on the low end (near GND) with a small resistor, such as 1 ohm. The ones I used happened to be alright, but most of them will be really wobbly. This noise adds to the real signal and can only be reduced by reducing the length on the sense leads (and any additional PCB trace lengths). Part costs are kept low and what you get are EMI blocking probes with changeable, multipurpose tips. Once the signal enters the coaxial cable, the situation becomes a transmission-line issue. Published in Silicon Chip September 2003, its hardly an original invention. when I bought fluke clamp meter for measure AC and DC current it really works very nicely. . Daniel Kramnik built an active differential probe and looks like he is seeing about 400MHz usable bandwidth. Hi, I'm looking to make a soundcard oscilloscope probe and i've come across 2 links. Solder a 10cm wire onto the exposed copper wire in the center of the cable. when set to full current strength. I was intending to measure up to 1MHz. For A 10X 100MHz Differential Probe. RIGOL Accessories including current probes for oscilloscopes up to 100 MHz or 100 Amps, high voltage oscilloscope probes, differential probes, attenuators, near field probes, options, and more . current probe: It depends what current level, and what bandwidth you want, but current probes are generally not cheap. The power must be less than the power rating of the terminating resistor: Calculate the value of the sense resistor (R1) by: Now check the power dissipation of the sense resistor. Have any of you guys ever built your own current probe? This brings us to the first and important step of determining the value of the sense resistor (RS). Inductance on the probe tip (LUS) and ground lead (LG) will limit bandwidth but the small size will help minimise noise pickup. Current probes can have bandwidths of 60MHz to 100MHz or less. Will PoE++ be helpful, a headache, or both? Make it look like the second picture there. The wave is reduced by approximately 10:1 but it no longer is square. This is somewhat unavoidable, especially in probes with a high step-down ratio. Figure 2: The 1:1 shielded voltage probe is based on coax cable. Current probes can have bandwidths of 60MHz to 100MHz or less. If you want to measure AC or DC current with an oscilloscope, a current clamp is a great way to do it. Due to their typical attenuation factor of 1:1, power rail probes add very little noise to the measurement. Theres nothing new under the sun. Create an account to follow your favorite communities and start taking part in conversations. Measure transient currents, such as transformer inrush currents and optimize your soft start circuits. Compensation is not necessary in this setup. They are called current probes and allow engineers to see and measure current waveforms in an oscilloscope up to tens or hundreds of amps. The clamp works perfect but is not the most professional tool ever, it is more as an example in order to understand the theory. US 120 VAC power. This probe design is little more than a 3D printed case, an old power supply toroid, and a conventional alligator clamp to make the business end. Connect up to three N2780 series current probes to a single power supply, enabling effective three-phase power measurements. Figure 1 shows a typical commercial voltage probe. Thank you. John Smith liked Palm Pilot Keyboard Bluetooth Conversion. Instead, you can construct your own 50 voltage probe. N2140A Passive Probe, 10:1, 200 MHz, 2-Pack. This site uses Akismet to reduce spam. For viewing a signal at a particular node, solder the centre conductor directly to that node; the ground lead should be soldered to the closest associated ground. The last screenshot is the SMA connector being probed directly by another 1:10 passive probe. If you want to measure AC or DC current with an oscilloscope, a current clamp is a great way to do it. A DIY oscilloscope probe to dig small differential signals embedded in high common mode voltages. I know an OP amp have a Band width voltage to amplify. This current probe is battery powered and connects directly to an oscilloscope with the supplied BNC cable. Follow these steps when designing the n:1 probe. I rushed to eBay and bought the first good deal that popped up. Keysight current probes use a hybrid technology that includes a Hall-effect sensor, which senses the DC current, and a current transformer, which senses the AC current. The leads use a Dupont 0.1" (2.54mm) 2-pin female connector to attach to the probe. -Devin. It was tested at currents of the order of single-digit microamps up to 10mA (it can be assembled for higher current ranges if desired), and it functions from DC to around 20kHz, and is fully isolated. easy to use and very professional. Next you'll have to be careful and strip both the outer insulation and the braided wire shielding off about 1cm from the cut end. You can safely assume that this resistor has better than a 0.1% tolerance. IC1 is a dual operational amplifier (op-amp), which can be TL072, TL082, TL062, or a similar one. To get the best use out of it I need to buy some RG-174 and built it into an enclosure. some models can do till 1MHz with up to about 50A, ASiDesigner, Stands for Application specific intelligent devices. I am always visiting your site and fluke.com.bd site both site are very helpful for me. XY mode the voltage and current and you have a BH curve. Unfortunately, most commercially available voltage and current probes are woefully inadequate at these high frequencies. You can get shunt amplifiers designed for the purpose, check out the INA210 family from TI as an example. Why not use Allegero current sensor chips, like the ACSxx series! You can view this noise by simply clipping the ground lead to the probe tip and hold it near the target circuit board. Interactive Electronic Toy of Jack-O-lantern & Horse. They are amazing, can hook onto any little tiny wire, and they stay put. For power engineers who work for mid-sized companies, there is only one path: build your own probes. Please be kind and respectful to help make the comments section excellent. In other words, we need to have a current probe since the oscilloscope plots voltage in the time domain. What you are left with should look like the first picture. Cheapo means sense resistors.or hall sensors if its higher current, or you can use current sense transformers which are cheap if used certain ways in smps. The user would clip the current probe, permanently attached to the case since the circuit was tuned for each one, over a wire and view the change in volts on an oscilloscope. Register, join the conference, and visit the booths for a chance to win great prizes. A differential probe is an active device which uses a differential amplifier to measure the difference between two signals. Then you're going to lightly solder another 10cm wire to the braid. Re: DIY Homebrew Oscilloscope Current Probe. The magnetic field should be easy to measure, I'm just going to wrap a secondary coil around the transformer core to measure the induced voltage. Bud Bennett 01/09/2020 at 01:08. GOWIN Semiconductor Corp. Appoints Centron Technology Inc. as distributor in Korea and Announces Business Operation Established in Hong Kong, A great DIY project: Build a non-artifact Kilogram Standard, Chip-scale air-quality monitoring for better gas detection, safer air, Use LTspice to simulate mixed continuous and sampled systems. Not bad for a DIY effort. Please could someone tell me why the answer is 0.020? Most annoying thing is that it's powered off a battery and I always forget to turn it off. Could I get a link or a model number to buy it? Here, you must understand and determine the effects upon the targeted circuit. The clamp surrounds the wire, so you dont need to break the connection to take your measurements.
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