[TechAssist] Re: Trouble with 10x Probe
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 17 Mar 2005 13:58:19 -0500
Free shipping?
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 17, 2005 9:28 AM
Subject: [TechAssist] Re: Trouble with 10x Probe
> 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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