Dip Meter Feeder Length Measurement

A dip meter or grid dip oscillator, GDO can be used for many measurements including measuring the electrical length of a feeder.


Dip Meter Tutorial Includes:
Dip meter / GDO basics     How to use a dip meter / GDO     Using GDO to measure inductance     Using GDO to measure capacitance     Measuring antenna resonant frequency     Measuring feeder electrical length    


A dip meter provides an easy method of measuring the electrical length of a piece of feeder. A knowledge of this length can be of value in a number of applications especially if the aerial installation is used for transmitting.

In order to make the measurement the feeder must be disconnected from the aerial and left open circuit. The other end should then be coupled to the dip meter.

Then with the meter in its oscillator mode it should be tuned from its lowest frequency upwards until a dip is noted. This frequency should be noted as it is the primary resonant frequency. However it is wise to check this by tuning further up in frequency to the next few dips. These are harmonics of the fundamental resonance and they should be at multiples of the frequency of the first dip. If all is correct then the frequency of the first dip corresponds to a quarter wavelength.



More Test Topics:
Analogue Multimeter     Data network analyzer     Digital Multimeter     Frequency counter     Oscilloscope     Signal generators     Spectrum analyzer     LCR meter / bridge     Dip meter, GDO     Logic analyzer     Power meter (RF & microwave)     RF signal generator     Logic probe     Time domain reflectometer, TDR     Vector network analyzer     LabVIEW     PXI     GPIB / IEEE 488     Boundary scan / JTAG    
    Return to Test menu . . .

Check out our selected suppliers:   PicoScope     Red Pitaya