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# Frequency And Meter

144 Threads found on edaboard.com: Frequency And Meter

## What test voltage should I use to measure an inductor with an LCR meter?

If you are measuring with LCR meter Supplier specified inductance value, test frequency and biasing current. normally the test voltage do not have major roll, Test voltage at 0.1V is the best practice

## Measuring inductance of Ferrite core Power tindictor using Meter

133701 It means the measurement in parallel or series. Normally high inductance at low frequency will consider as parallel measurement. Low inductance at high frequency will consider series measurement. See the chart for more clarity. Hope it is helpful

## How to set Rectangular wave guide port for nano size antenna in CST??

my antenna is in nano meter size... and got a frequency in 800 to 1000 thz. below -10 db of return loss.used Gold and silicon dioxide as matarial. got 4.81 dbi directivity.... but very very low minus scale efficiency... then i understood it was a port mistake... we can not simply generate the rectangular wave guide port for (...)

## Frequency meter from Ebay

I bought this 8 digit wide range frequency meter from Ebay at 10 \$ but instructions came in Chinese and seller failed to give any instr in English Model PLJ-8LED-H please help

## Why we have to match the frequency of LCRmeter to the frequency that DUT is tuned for

The LCR meter detects the voltage, current and phase angle of DUT. Thus, The DUT can be represented as L, C or R. But, why we have to match the frequency of LCR meter to the frequency that DUT is tuned for? When we change the test frequency, the reactance must be changed. Causes the voltage, (...)

## Frequency meter with PIC16F877A in Microc

hi, Typically for counting a frequency input, TMR0 is used for the Timing Gate and Tmr1 16 bit is used to count the input pulses/frequency. Tmr1 interrupt is used to increment a overflow counter. At the end of the TMR0 gate period, the overflow count and the contents of TMR1 are proportional to the (...)

## DIY high frequency Vpp meter

Hello I would like to measure Voltage swing Vpp (or even Vmin and Vmax) in up to 50Mhz range with help od DC multimeter and a reasonably simple and cheap diy circuit. There is a lot of schematics on the net based on diode rectifiers, but these will not work at high frequency. I will be grateful for (...)

## Capacitance measurement help

Dear All, I just bought my first LCR meter Applent AT825 and faced issue when testing it. I measured capacitance of 22 uf Panasonic NHG series aluminium electrolytic capacitor with this meter and same thing with Agilent U1252B multimeter. Well Applent is 4 wire meter and (...)

## Band pass filter for RF signal meter circuit

An LC filter at this frequency and bandwidth it will not work properly mainly due to the low values of components, which will be in the range of fF and pH. Cavity or a SAW can give appropriate performance. For SAW filters check, Murata, TDK, Taiyo Yuden, Tai-saw

## How to generate 100Hz - 1MHz Sinewave with >=14-bit resolution, DDS?

Hello. I am developing a LCR meter that will function on its own but can also be connected to a PC to communicate with Matlab, and on one hand I want it to be able to measure Impedance at 100Hz, 1kHz, 10kHz, 100kHz, 500kHz and 1MHz but I also want to perform a sweep over that range so I can plot(in matlab) impedance vs (...)

## Resistivity meter design.

Rocks are like a mixture of weak resistance and capacitance. They make great insulators unless moist with contamination ( clay) becuase water has a dielectric constant 60x greater than air. Since all insulators are capacitors between any two conducting points, there is a risk of charging current on capacitance giving a lfase reading unless stable,

## Are Extech EX730 clamp-meters repairable???

I've just fried my Extech EX730 clamp meter while developing something that used a 230V-12V transformer in reverse, and 18V on its secondary. Given that the meter is rated to 600V, I figured there would be no problem! Now I have a meter on which only the temperature and frequency functions (...)

## Flow Meter Calculation

I'm going to be using this flow meter with an LCD & Arduino to calculate L/MIN. It says calculation is Pulse frequency (Hz) / 7.5 = flow rate in L/min. I want the meter to read out in L/min. Is the calculation 60/7.5 = Flow rate Need a wise head ha [CO

## frequency counter/meter in VHDL

I want to make a frequency counter in ALTERA DE1 with VHDL. for the beginning I want to count frequencies between 1MHZ to 50Mhz(the main clock is 50mhz) the result will show in 7 segment display. I have tried to count rising edges of the main clock and according to this to calculate the measured frequency but it's not really good.. (...)

## wireless energy meter

Wireless E or H field depends on gap loss and coupling for current, frequency and Loaded Q of detector among other things. it is best to use a good receiver and monitor RSSI signal.

## How do I know that the esr meter measures the internal resistance of the capacitor ?

When the current is in phase with voltage, such as a high frequency square wave from a very low impedance source of current , then it is ESR. RLC meter use a constant current source sine wave (others with pulses) and from the voltage of the sine wave determine that phase shift and amplitude. Then compute R & X

## energy meter problem

hi everyone, i have a energy meter, it have a strange problem. it show the correct frequency, but read the power and current as zero and voltage more higher of the real value the follow picture show the fre

## LCR meters and how to measure parasitics.

How do you measure the capacitance of a inductor and the inductance of a capacitor? You can only do that indirectly by measuring at different frequencies. For example an inductor with parallel capacitance between the turns will show an increase in L over frequency. From the change in

## Need help with mikroc program that reads water flow meter.

It's useless to connect a pulse output to an ADC input. Instead connect it to a counter input or interrupt capacble GPIO and make a frequency counter.