A Free & Open Forum For Electronics Enthusiasts & Professionals, Login with username, password and session length, I came across this graph where current is on the Y axis, YouTube and Website Electronic Resources ------>. The result is seen below. In that case, I recommend using a Current Transformer (CT). It works the same as an electrician’s clamp-on ammeter, where heavy-duty jaws clamp around the conductor in which the current flow is to be measured. My question is why adding a shunt resistor is a common practice for measuring current with an oscilloscope. In other words, if you know or can find the resistance of a system, an oscilloscope can determine current. They have never seen Seinfeld and are deathly scared of wasps. The shunt resistor is usually so small, that it doesn't have an impact in most applications. The easiest person to fool is yourself. Unfortunately, differential probes are also rather expensive with prices starting at around $1k and extending past $5k. the 1rst question : how much is the input resistance of my scope !!!! Has to be a bench equivalent setup. I fitted mine with a BNC connector for easy connection to test equipment. The current transformer is easy to use. Set channel 1 to DC or AC depending on the system you seek to measure, then ensure that the trigger mode is set to auto with the trigger source as channel 1. Part 3 will deal with current measurement and current probes. This is equally true of voltage measurements -- the 1 MOhm / 10 meg impedance of a scope / 10x probe is not infinite, and due to the shunt capacitance it can load your circuit quite badly at high frequency. I use it with a NI DAQ system, but would work fine with a scope (though you'll need to re-scale it). According to Triad Magnetics, the CST-1030 exhibits a secondary voltage of 0.0977 V/A when loaded with a 100 Ω resistor. To begin the process of determining current, first plug in your oscilloscope. Depending on the waveform ma… you cannot measure current simply using an oscilloscope and the normal (voltage) probes. Adjust the controls until you see a stable sine wave, then measure along the center vertical line with the smallest divisions to find the voltage of the electrical system. A routine for the conversion from rms to peak value  is used for the generation of the saturation curve required by BCTRAN and STC. The circuit uses an LC oscillator to drive a transistor and pulse current through the LEDs at about 700kHz so there is no current limiting resistor already present in the LED string. The first is using a resistor (sometimes called a current shunt) in series with the current being measured. No. In stark contrast, oscilloscopes are only capable of measuring the voltage of a system, which would make an oscilloscope a poor choice for measuring current if not for Ohm's Law. To make the graph of I vs. V, the oscilloscope is put in X-Y mode. A Free & Open Forum For Electronics Enthusiasts & Professionals, Login with username, password and session length. Hooking the probes up is series is a sure fire way to blow up your scope. If you find the contents of this page to be useful, please consider making a donation by clicking the Donate button below. The ability to measure current using an oscilloscope can be useful at times, for example when characterizing an unknown impedance or when designing current limiters. 15 amp units, 2.5V midpoint 0-5V output. Set the oscilloscope's trigger mode to auto. You can probably get something for your scope that’s similar. Procedure A - Observing And Measuring Lamp In-rush Current At Turn-on: Be sure to use resistors with a power rating equal or greater to the system's power output if possible. Your components would have to be pretty low power to do this with a shunt resistor and voltage probe. Doesn’t have to be expensive. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. The ability to measure current using an oscilloscope can be useful at times, for example when characterizing an unknown impedance or when designing current limiters. There are many different ways of measuring current depending on the exact conditions of each situation.
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