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.
|Published (Last):||23 August 2015|
|PDF File Size:||10.72 Mb|
|ePub File Size:||11.70 Mb|
|Price:||Free* [*Free Regsitration Required]|
LC Connector adapter
If not, then match the value of the resistor R7 adzpter make shape of the signal as close to square wave as possible. 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. Started by fastline Yesterday at 8: The source of the voltage is negative pulses across the inductance Lx.
When it switched into position “L”, the measurement circuit operates as an inductance meter, see the Fig. When you built this, keep the connections, including gorund connections, short because tens of nanoseconds count.
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.
A power supply of the circuit is a 9-Volt battery or any other voltage source. The schematic diagram for the inductance and capacitance meter is shown in Fig. The Circuit The circuit’s operating principle is that if you make a pulse width proportioal to inductance, and keep the pulse frequency and amplitude constant, and then pass indctance pulse through a low pass filter so that only the average induuctance comes out, the resulting DC voltage is proportional to the inductance.
I used it when developing a d. Any inductance in that path will add to the measured inductance, so keep it short and small. It also analyzes transistor’s characteristics such as voltage and gain. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of.
It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of adapger capacitors.
FOA – LC Connector adapter
The procedure is straightforward: I had run across the forerunner of this circuit, one that is 6889 sophisticated in that it has a zero adjustment and range switch, but it was limited to higher inductances. More precise measurements I do with a resonance bridge.
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 meteg anything fancy, and since once a friend finishes his AT90Sbased design, I plan to make one myself, I figured I’d use this for less than a year, so I didn’t want to invest a lot of time in making it.
Inductance and capacitance meter adapter for DVM This device is an addon to a digital or analog voltmeter.
Here is the unit measuring a 33 uH commercial RF choke. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings.
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 acapter or the capacitor in order to claibrate the circuit. The voltage is negative. More resources from carbonzit Resource icon. The pulse width is proportional to the inductance and inversely proportional to the resistance. To participate you need to register.
Electro Tech is an online community with overmembers who enjoy talking about and mete electronic circuits, projects and gadgets. Resource icon Inductance measuring adapter for multimeter A switch S2 is used to configure adapterr measurement circuit.
This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors.
Jeter inductance tester converts the inductance value of the coil being tested to a voltage which can be measured by a voltmeter. Real-Time ‘Stopwatch’ This is a simple electronic “stopwatch” you can use to time an event. How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig. Connect a battery and a DVM digital volt meterput a known inductor in the LX position then adjust the potentiometer until you get the anticipated reading on adaptter DVM.
If adaptter runs at a greatly different frequency, try changing the oscillator components or try using a 74HC14 made by a different manufacturer.
Pay particular attention to the leads and contacts for LX. In order to get a pulse with a width that is substantiall longer adapterr the rise and fall time of the schmitt trigger, whcih is a requiremnt for good linearity, while the inductance was metet the nH range, I had to use a very low resistance, hence the three ohm resistors and their drivers in parallel.
Never mind, just adjust the oscillator frequency until you get it to calibrate. Here are some things to check when calibrating: Adzpter circuit relies on a voltmeter with a millivolt range and a high input impedance as a readout device, so it doesn’t have a buffer on the output.
The output waveforms can be both amplitude and frequency modulated. C5 in feedback circuits. The last inverter in merely to make the pulse positive in polarity so that the voltage increases as the inductance increases.
If it isn’t, its probably avapter the thresholds on the 74HC14 are not symmetrically positioned around 2. 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. Just saying hello Started by MichaelaJoy Yesterday at 6: I happned to have the 74HC14 in an SO package so I soldered it onto the metalized side of a prototyping board.