Cgs synth

For all high resistance measurement, a higher voltage is required. At
work we work in the hundreds of MegOhm region. The resistance testers we
use, offer several hundred volts across the resistor under test. A DMM
with a 9volt battery cannot compete, nor can it measure with any
accuracy, such large values.

Just my $0.02 worth...

Regards,

Tony Mowbray

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http://www.linkedin.com/in/tonymowbray

Moto Guzzi 1200 Sport '07

VK2AGM



peng3002 wrote:

>
>
>
>
> --- In cgs_synth@yahoogroups.com <mailto:cgs_synth%40yahoogroups.com>,
> "Guy" <guy@...> wrote:
> >
>
> > Amazing to see how far off certain values can be, even with 1%
> resistors.
> >
>
> Well...if the resistor is off more than 1%, it is NOT a 1% resistor.
>
> > And, Ken, how important is it then to get those particular high
> values exactly right (in the VCO) ? For instance, would a 20M (instead
> of 22M) be good too ? (for lesser kludginess)
> >
> >
>
> I would think it would be perfectly fine to use a 20M. For 5% resistors:
> 22M could actually measure between approx. 21M or 23M and still be in
> spec. A 20M could measure between 19M and 21M.
> 22M and 20M are practically the same resistor.
>
> Still unsure? Just try it. CGS boards are very easy to desolder
> components if needed.
>
> I see a 22M at the input pin 3 of the 3900 for the staircase
> generator. The other end of the 22M is attached to a trimmer wired
> between +V and 0V. If I were building this, I would simply use a 10M
> resistor (since that is the highest value I have) and set the trimmer
> lower.
>
> p.
>
>