[SI-LIST] Re: Scope probe attenuation
- From: david_instone@xxxxxxxxxxxxxx (David Instone)
- To: Aklein@xxxxxxxxxxxxxxxxxxxxxxxxxx
- Date: Fri, 03 Aug 2001 13:59:16 +0100
Your 1k probe may be a 1K probe when used on a 50 ohm input. Check its
actual through resistance, if it's actually 950 ohms then when used on a
50 ohm input it will give you a 20:1 probe, ie multiply what you see by
20. If it's actually 1k through then multiply by 21.
Adam Klein wrote:
>
> Hello,
>
> My question is regarding scope probe attenuation.
>
> I have a Tektronix TDS640A oscilloscope which has four channels designed
> for either 50 Ohm or 1M Ohm probes I have a 1K Ohm probe which works as far
> as displaying a wave form but the amplitude is considerably less than it
> should be. Does anybody know an equation that I can apply to find out the
> exact difference in attenuation between this probe and a 50 Ohm probe your
> help is appreciated.
>
> Adam
>
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--
Regards
Dave Instone. Compliance Engineer
Storage Systems Development, MP24/22
Xyratex, Langstone Rd., Havant, Hampshire, P09 1SA, UK.
Tel: +44 (0)23-92-496862 (direct line)
Fax: +44 (0)23-92-496014
http://www.xyratex.com Tel: +44 (0)23-92-496000
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