20-01-2013, 10:43 PM
We used those and higher values in FET op-amp designs a few years ago for circuits designed to measure the resistance of distilled water using a glass electrode. Unfortunately, they tend to reduce in value when handled without gloves due to sweat and other conducting salts in perspiration.
We went over ot better quality units which were each sealed in a glass tube bit like the reed switch from a relay. At least these could be wiped clean with solvent if handled.
We went over ot better quality units which were each sealed in a glass tube bit like the reed switch from a relay. At least these could be wiped clean with solvent if handled.
