I have concerns about how that resistance was determined. I do not think the methodology provides an accurate result. First, look at eh schematic of the 260 - there are components in series /parallel with the meter. Even with just the low current jack, there are still components in series. Second, I have never, NEVER, seen an analog meter provide accurate reading of a peak or transient voltage. The frequency response/ transient response is not there. Some of the components in parallel with the meter movement are there to protect the meter. Additionally, there are balanced weights on the mechanical portion of the movement to "stabilize" the movement and thus decrease transient response. When trying to calibrate a synchro system that was providing a sine wave of about 20 Hz, my Simpson (freshly calibrated) was off by more than 20 %. of the voltage displayed on an Oscilloscope which I was using for making the adjustment. Third, I know of no Simpson 260 that has a lowest range of 60 micro-amps, everyone I know of is either 100 or 50 micro-amps. Don't knew what the new ones are, but am sure that none of the old big ones have that value. Here is a source for some info on the various Simpson meters. http://simpson260.com/downloads/downloads.htm
Rich -- View this message in context: http://n2.nabble.com/Re-Radio-Shack-ESD-mat-doesn-t-meet-spec-tp4799044p4806654.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
