[TechAssist] Re: Trouble with 10x Probe
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 17 Mar 2005 09:28:23 -0500
Have you thought of eBay for a scope probe? I just did a search and
found some of them around $10.00-12.00.
Here is an example:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=25415&item=7500766134&rd=1
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Bil Green wrote:
> Thanks everyone! Placing 20pF across the 9M resistor fixed the
> problem. A trimmer cap (when I get one) will improve the accuracy.
>
> Bil
>
> PC 1000
> Mammoth Lakes, CA
> 760-924-1000
> M-Pulse 5000 magnetic pulse generator
>
>
> Wednesday, March 16, 2005, 6:56:54 PM, you wrote:
>
> TT> Sounds like you need to upgrade Bil. :-)
>
> TT> Especially if you are now doing this on a "full" time Basis.
>
> TT> Remember..Higher Voltage doesn't mean a "Higher" bottom line. (kidding)
> :-P
>
> TT> -Ed-
>
> TT> Bil Green wrote:
>
>
>>>I am trying to find just what's needed to build a 10x adapter for a
>>>scope probe.
>>>
>>>I need to measure up to 2kV AC PP and it's hard to find one that high
>>>(and I need it right anyway). I will be checking a 5kHz AC voltage.
>>>
>>>My scope has a 1M input impedance, so adding 9M in series should do
>>>the trick. But that doesn't work! The voltage reading is far less
>>>than 10% measuring 250V PP horizontal signals (TV analyst). I tried
>>>a carbon composition and carbon film resistor.
>>>
>>>Same problem using it with my PP voltmeter (designed for testing TVs,
>>>and also has a 1M input impedance).
>>>
>>>The 10x probe for my scope went bad (reads way too low when set for
>>>10x). I was using it to measure an AC voltage which was over 2,000V
>>>PP and didn't know that the probe was only rated at 600V.
>>>
>>>Bil
>>>
>>>PC 1000
>>>Mammoth Lakes, CA
>>>760-924-1000
>>>M-Pulse 5000 magnetic pulse generator
>>>
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>
>
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