What is the metal case of a quartz connected to?

Bricolo · 24th April 2004, 04:56 PM

When I connect my scope probe to my Kwak-Clock's cristal, I can see a 0.6V pp sine wave. (to tell the truth, I also see a waveform when the probe is not touching the case, but a few milimeters away. The signal is 20mV pp)

Should I ground the case?

Sch3mat1c · 24th April 2004, 05:59 PM

Is the probe grounded? What frequency is it?

Tim

roadkill · 24th April 2004, 06:37 PM

Probably capacitively coupled to the case. IMO, you should ground the case, it will prevent the radiation of energy from the crystal. Right now, your crystal's body is acting like an antenna.

Bricolo · 24th April 2004, 06:44 PM

Quote:

Originally posted by Sch3mat1c
Is the probe grounded? What frequency is it?

Tim

The probe is earthed since it's connected to the scope, and that the scope is connected to the mains earth
The probe's ground goes to the circuit ground

The circuit is running from batteries

The frequency is 11MHz, same as the quartz

Bricolo · 24th April 2004, 06:45 PM

Quote:

Originally posted by roadkill
Probably capacitively coupled to the case. IMO, you should ground the case, it will prevent the radiation of energy from the crystal. Right now, your crystal's body is acting like an antenna.

that's what I was thinking

24th April 2004, 04:56 PM	#1
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	What is the metal case of a quartz connected to? When I connect my scope probe to my Kwak-Clock's cristal, I can see a 0.6V pp sine wave. (to tell the truth, I also see a waveform when the probe is not touching the case, but a few milimeters away. The signal is 20mV pp) Should I ground the case?

24th April 2004, 05:59 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Is the probe grounded? What frequency is it? Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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24th April 2004, 06:37 PM	#3
roadkill diyAudio Member Join Date: Jan 2003 Location: Fort Collins, CO	Probably capacitively coupled to the case. IMO, you should ground the case, it will prevent the radiation of energy from the crystal. Right now, your crystal's body is acting like an antenna.

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