Re: [volt-nuts] 731A output impedance

2012-11-27 Thread ed breya
The simplest way to drop the output impedance without adding much circuitry is to just change the series R to 100 ohms or so - that would still give pretty good isolation from capacitive loading. If the R is dropped to zero, the DC performance will be best, but you'll have to worry about the

Re: [volt-nuts] 731A output impedance

2012-11-27 Thread WB6BNQ
Hi Ed, I am a little confused with regard to your paragraphs 3 4. Could you elaborate on those two paragraphs ? thank you, BillWB6BNQ ed breya wrote: The simplest way to drop the output impedance without adding much circuitry is to just change the series R to 100 ohms or so - that

Re: [volt-nuts] 731A output impedance

2012-11-27 Thread ed breya
I'm not sure how much elaboration is needed, but here's some: If you take all of the feedback from the output terminal, that's better for DC accuracy by eliminating the voltage drop of the series resistor, while still providing some overload protection to the opamp. But, it also decreases

Re: [volt-nuts] 731A output impedance

2012-11-27 Thread Bob Smither
On 11/27/2012 07:37 PM, ed breya wrote: I'm not sure how much elaboration is needed, but here's some: If you take all of the feedback from the output terminal, that's better for DC accuracy by eliminating the voltage drop of the series resistor, while still providing some overload protection