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From: John Fields on 20 Mar 2010 20:49 I made an error on the LC setup; it should look like this: +--------------+ | | | [L] | | +-------+ [FUNCTION GEN] +<----[X10 PROBE]---|VERT | | | | | | [C] | | | | | | +--------------+-------------------|GND | +-------+ And, instead of looking for a null, you tune the generator for a peak on the scope. The reason is that the junction of the LC is magic, and were it not for parasitic losses in the circuit you'd generate a singularity as you tuned through resonance. The posted RC needs a little more fleshing out in terms of theory, and the RL is on the bench. Maybe tomorrow... :-) JF
From: Kari Laine on 4 Apr 2010 10:53
John Fields wrote: > I made an error on the LC setup; it should look like this: > > +--------------+ > | | > | [L] > | | +-------+ > [FUNCTION GEN] +<----[X10 PROBE]---|VERT | > | | | | > | [C] | | > | | | | > +--------------+-------------------|GND | > +-------+ > > > And, instead of looking for a null, you tune the generator for a peak on > the scope. > > The reason is that the junction of the LC is magic, and were it not for > parasitic losses in the circuit you'd generate a singularity as you > tuned through resonance. > > > The posted RC needs a little more fleshing out in terms of theory, and > the RL is on the bench. > > Maybe tomorrow... :-) > > JF Thanks! I am now back it to this scope project. Right now I try make calibration. It is not an easy task. It sad that so much rubbish is posted to this news group.... Best Regards Kari -- PIC - ARM - DISPLAYS - RELAYS - MODULES - CONVERTERS - I2C - SPI - KEYPADS - ACCESSORIES http://www.byvac.com (I am just a satisfied customer) |