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Old 24th April 2004, 04:56 PM   #1
Bricolo is offline Bricolo  France
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Default 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?
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Old 24th April 2004, 05:59 PM   #2
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Is the probe grounded? What frequency is it?

Tim
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Old 24th April 2004, 06:37 PM   #3
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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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Old 24th April 2004, 06:44 PM   #4
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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
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Old 24th April 2004, 06:45 PM   #5
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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
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