Hameg Analog Oscilloscope

[Carl-NC]

As Skippy said above, an ideal inductor has a current that is the integral of the applied voltage. In an RX coil, the applied voltage is the result of Faraday's Law, and is the (negative) derivative of the applied magnetic field. Ergo, the RX coil current waveform represents the magnetic field waveform. The RX voltage is the derivative.

You can certainly filter this back to a fundamental sinusoid and look at it as if it were a normal VLF. Several multifrequency designs do this -- CZ's, DFX, V3. But you can also leave it in the time domain and look at the raw target tau. BBS/FBS does it this way.

[pustareka]

Katuska Rogovskogo - Rogovsky coil - best I datchik

[EL NINO]

Yesterday, 05:30 PM

#44

Carl-NC
Administrator

Join DateFeb 2005LocationOregonPosts3,625

Originally Posted by EL NINO
In the following measurements I used a parallel 10 ohms ( Mr Green s" suggestion) resistor:



Much better!

Thank you for your help ... Mr Carl .. , I believe my next measurement will be better .., because only the right results can create the right consideration for the work characteristics - in this case Multifrequency Detector.

[Mark-VA]

All this got me to thinking about something I did while looking at the output of the Equinox. I'd been trying different types of receiving coils and by chance I tried the Fisher F75, 5" coil. Don't remember which set of pins I used but remember plainly getting a beautiful saw tooth sine wave. On this coil pin 1-2 reads 35.8 ohms and pins 3-4 read 2.3 ohms. Just thought I'd share with all the experts here.