## Measurement Uncertainty Forum

### Adding Uncertainties

I was wondering if this method could be credible and if I could use it to correctly calculate an uncertainty:

I'm trying to measure 9 GOhms with a Fluke Megohmeter. I want to use 9 GOhm precision resistors in series with each other, and verify each resistor with a previously calibrated multimeter. I can only verify one GOhm resistor at a time, as my multimeter's range is limited to roughly 1 GOhm. Is it mathematically correct to add each measurement uncertainty of each resistor in a linear combination, and then combine in RSS with the other uncertainty parameters such as the Megohmeter's resolution, environmental conditions, etc.?

I'm trying to measure 9 GOhms with a Fluke Megohmeter. I want to use 9 GOhm precision resistors in series with each other, and verify each resistor with a previously calibrated multimeter. I can only verify one GOhm resistor at a time, as my multimeter's range is limited to roughly 1 GOhm. Is it mathematically correct to add each measurement uncertainty of each resistor in a linear combination, and then combine in RSS with the other uncertainty parameters such as the Megohmeter's resolution, environmental conditions, etc.?

Re: Adding Uncertainties by Robert Florczyk - Friday, March 9, 2012, 8:59 AM

Re: Adding Uncertainties by James Jenkins - Monday, March 12, 2012, 4:30 AM