On 07/27/2018 12:40 PM, Brian via TriEmbed wrote:
On 07/27/2018 10:37 AM, Pete Soper via TriEmbed wrote:
A trimmer capacitor can be used to get matching just right
Technically speaking, a probe's trim cap is about adjusting the
probe's own impulse response (the probe itself is an RC circuit with a
time constant, and therefore has an impulse response). Generally this
is used during probe calibration with a 1 kHz reference square wave,
and adjusted until the corners of the measured square wave are sharp
with no ringing or excess damping. Naturally this does affect the
probe's impedance, but probably not in a useful range for Mauricio's
particular need.
Yes, I said that. Maurico's scope has so little bandwidth this issue is
irrelevant, but I thought it might be of interest to others.
Also, capacitance in general primarily only affects AC impedance (an
ideal capacitor's DC impedance is infinite; real capacitors have a
leakage current but typically a very small one), so capacitance alone
is not enough to effect proper impedance matching.
Yes, altering "DC impedance" would be a hell of a challenge.
Suffice it to say, impedance matching for signals involving both AC
and DC components is no simple ordeal!
-B
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