Turn your Digital Voltmeter into an Inductance and capacitance meter. Page 1. Page 2. Products 1 – 20 of 22 Source LCR Meter Accessories at ; the leading distributor of IT, Test Peak Electronic Design LLSm LCR Meter Adapter.
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More resources from carbonzit Resource icon. If yours runs at a greatly different frequency, try changing the oscillator components or try using a 74HC14 made by a different manufacturer. The voltage is negative. Inductance and capacitance meter adapter for DVM This device is an addon to a digital or analog voltmeter. Potentiometer Questions Started by norbss Yesterday at There is a remote possibility that you are using a damaged 74HC14, but check this last since it isn’t very likely.
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LC Connector adapter
mfter When you built this, keep the connections, including gorund connections, short because tens of nanoseconds count. In order to get a pulse with a width that is substantiall longer than the rise and fall time of the meteer trigger, whcih is a requiremnt for good linearity, while the inductance was in the nH range, I had to use a very low resistance, hence the three ohm resistors and their drivers in parallel. Just saying hello Started by MichaelaJoy Yesterday at 6: It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc.
The voltage regulator provides 6-Volts stabilized unductance for the circuit. Any inductance in that path will add to the measured inductance, so keep it short and small. Author carbonzit Creation date May 25, This device is an addon to a digital or analog voltmeter.
The pulse width that is proportional to the inductance is made by drving the unknown inductance through a resistor and connecting the resultant sawtooth waveform to the input of another schmitt trigger which, because of the sharp switching action on its output that results from its hysteresis, provides a nice rectangualr pulse.
The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings. I needed a way to measure hand-wound RF inductors in my second lab, and since I would only be doing this occasionally, I didn’t need anything fancy, acapter since once a friend finishes his AT90Sbased design, Metdr plan to make one myself, I figured I’d use this for less than a year, so Inductqnce didn’t want to invest a lot of time in making it.
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This Inductane network operates as an integrator circuit. Started by fastline Yesterday at 8: Inductance Meter In-Use The resolution of the analogue meter obviously limits its performance, but I generally use it to just ensure I am in the right ballpark while winding coils or picking from the junk box. For example, use a 1 microhenry inductor and adjust the potentiometer to get mv on the DVM. More inductabce measurements I do with a resonance bridge. The pulse frequency is set by a schmitt trigger oscillator composed of a feedback resistance 2k pot and 3.
Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket. The output waveforms can be both amplitude and frequency modulated.
Media New media New comments Search media. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors.
I adapted it to the components I had on hand and changed it so that it would work in the nanohenry to 50 microhenry range. If you find the voltage to be very low, say under a volt, then this points to a wriing error, a problem with the 5V regulator or the battery, a damaged 74HC14, or you are using a very low resistance voltmeter. It also analyzes transistor’s characteristics such as voltage and gain. You might have some trouble getting the thing to calibrate if the switching thresholds on your 74HC14 are very different from the one I used, so you might have to change the resistance in the osicllator or the capacitor in order to claibrate the circuit.
The switch S2 is in position “C”. The transistor Q1 is used to amplify meher signal to provide sufficient current through potentiometer R8 and a load circuit.
Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at When it switched into position “L”, the measurement circuit operates as an inductance meter, see the Fig. The switch S2 is in position “L”.
How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig. The schematic diagram for the inductance and capacitance meter is shown in Fig. Use an DVM with high input impedance to measure a voltage across the capacitor “C”. Real-Time ‘Stopwatch’ This is a simple electronic “stopwatch” you can use to time an event.
To my surprise, it actually worked just fine, 1K in series was sufficient to allow a useful calibration and didn’t overload the drive capabilities of the last gate in the package. If not, then match the value of the resistor R7 to make shape of the signal aadpter close to square wave as possible. There is a way to check out the duty cycle at the collector of Q1.