[TechAssist] Re: Trouble with 10x Probe
- From: "George" <grndmstrg@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 16 Mar 2005 21:31:23 -0800
Bil,
Try placing a 3kv cap across the 9 meg next time you try with 1/9th the
value of the scope input capacitance this should equalize the ac/dc ratio.
George
Afana Electronics
Moreno Valley, CA
----- Original Message -----
From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
To: ".TECHASSIST @ freelists . org" <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, March 16, 2005 6:39 PM
Subject: [TechAssist] Trouble with 10x Probe
> 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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