How to Effectively Choose and Use Test Instruments

HVAC School - For Techs, By Techs · Jul 9, 2020 · 1h 6m

Bill Spohn with TruTech Tools joins us to talk about why being "approximately correct" is better than being "exactly wrong" when it comes to test instruments.

When you see a number, that doesn't necessarily mean that you're dealing with a number you're supposed to see. For example, nitric oxide can present as "false CO" to a carbon monoxide sensor. Test instruments that mistake nitric oxide as carbon monoxide will give a different reading than ones that don't pick up nitric oxide as CO, but that doesn't necessarily make either of them wrong. So, some instruments can give you false positives…