Okay this video we ‘re going to talk about how to measure capacitors and inductors using your oscilloscope and equitable a handful of parts the video was inspired by a web log post by Glenn shin here on the setting Junction comm web site, and basically he merely showed this basic principle a pretty simpleton thing and I thought would be a great video because it does a couple of things it shows us how to use some identical basic circuits like a simple RC circuit or an LC tank lap to measuring stick and calculate out values of unknown capacitors and inductors it besides shows a useful way to use an oscilloscope in the lab, and it besides shows us how we can use another tour that I did a video on here not excessively long ago this you know fast edge pulse generator that ‘s based on a Schmitt trip oscillator and a pair of parallel buffers I did a video on this to show how to use this circuit as a TDR, and then we can now use this as a source for measuring capacitors and inductors and the principle here is that we will basically put our unknown capacitor here through with a known resistor hit it with this rising edge and bill the reaction and by doing that we can calculate out the capacitor rate similarly for the inductors will basically form a tank circuit with a known capacitor and our unknown inductor okay and then hit that with the high frequency content of this edge and this circuit will ring at its resonant frequency knowing the evocative frequency and this capacitor value we can calculate out the inductor so get ‘s take a look at what the circuit actually looks like and then how I built it, so the fastness is basically you know this circuit correct here okay we ‘ve got our stimulation here is a BNC connection the first separate of it to measure the unknown capacitance is a simple resistor I chose 1k ohm you can use something else but 1k ohm works out just fine for this the frequency of the circuit I ‘m dealing with, and then we put our unknown capacitor here, so we basically take our firm edge coming in here, and we measure the response of an across the capacitor, and it would kind of expression like this hera ‘s our debauched input approve and then the output is going to have this exponential you know rise or fall clock now without going through all the mathematics of it the simple fact of the matter is that the exponential rise is going to reach 63 % of its final value over a meter time period that ‘s peer to the intersection of the resistor times the capacitor all right, so it ‘s a pretty simpleton thing and to make your biography even easier if we adjust our setting thus that this signal from top to bottom occupies eight divisions on the oscilloscope screen okay sixty-three percentage of eight is five so all we need to do is measure how hanker it takes to go from baseline up five divisions out of eight, indeed now we ‘ve measured that time period once we know that we can calculate the capacitor or equally simple about taking that respect divided by our o on the unknown inductor side of things we basically form an LC tank circumference now the LC tank circuit is …