[SI-LIST] Re: Passive Probe
- From: "Orin Laney" <olaney@xxxxxxxxx>
- To: "'See Hour'" <yshour2001@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 25 Feb 2011 15:38:05 -0800
It's actually a 9Mohm resistor that forms a 10:1 divider with the standard
scope 1Mohm input resistance. There is also a small cap in parallel so that
the time constant of the probe matches that of the scope input and frequency
response is flat. These probes usually have a small trimcap that the user
can adjust for flattest response. There's more that makes a good scope
probe, but like Steve said you should troll the Tektronix site for the
applicable app notes.
Orin Laney
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of See Hour
Sent: Friday, February 25, 2011 2:30 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Passive Probe
Hello Gurus
10:1 Capacitive-input probes has a 10Mohm series resistance at probe tip.
What is the purpose of the resistor?
The answers that I have in my mind are:1) to be able to measure high DC
voltage2) so that the input capacitive loading is small3) to minimize the
loading that the cable capacitance would impose on the DUT
Am I right about?
RegardsYing
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