Posted by Texasmark1 on July 26, 2015 at 19:33:11 from (198.45.234.19):
In Reply to: Re: Burning points posted by Geo-TH,In on July 26, 2015 at 17:47:20:
I wouldn't call the lead resistance a measurement error as it's common practice to "zero the meter" prior to measuring as zero was highly dependent on the voltage of the internal battery to operate that 50 ma meter. Since current technology is digital, unless the battery has just crapped out, you have no measurement error as such. Since there is no knob to turn, you just record the "offset" in your brain when making resistance measurements and besides, once you get over 100 ohms, what's .4?
They were 20k on the DC scale but 10 on the AC scale. Course AC was usually used for power line measurements with zero source impedance, so to speak, so it didn't matter. Other thing was the measurement accuracy was like +/- 5 to 10%, probably due to the resistor types used in the internal voltage dividers or the D'Arsonval meter movement itself. The HF uses 1% or better Metal Oxide resistors which are resistant to moisture intrusion which the old Carbon Composition weren't and changed value with age due to absorption.
No! On the issue with input impedance of the meter and your tractor.
I do recall mentioning errors in measurement methodology as a problem in the Simpson and other Scalar instruments.
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