CadiBrewer
Well-Known Member
At AJ's great suggestion, I attempted to perform a stability test of my new Hach meter today. Cutting to the chase, I learned a lot as a first time meter owner and I plan on doing the test again tomorrow because I'm not confident in my abilities to calibrate the meter today on my first try.
The results of today's test: I calibrated using the stickie and the manual instructions. In hindsight, I feel like I should have let the meter rest longer in the first buffer before starting the calibration and before accepting the first result.
For the first hour, I checked every 10 minutes. It held at 4.01 for the first hour. Then I checked every 15 minutes for the next two hours. It moved to 4.02 at 75 minutes and stayed there until the 150 minute mark. At the 150 minute check, it went to 4.03. It stayed there until almost 240 minutes, when it went to 4.04. At that point, the symbol indicating that the calibration needs to be run again appeared. I aborted the test due to my uncertainty with the initial calibration and resigned to try it again tomorrow.
When I complete that test, I'll put the results in a better spreadsheet format and graph them so they are usable by the forum.
The results of today's test: I calibrated using the stickie and the manual instructions. In hindsight, I feel like I should have let the meter rest longer in the first buffer before starting the calibration and before accepting the first result.
For the first hour, I checked every 10 minutes. It held at 4.01 for the first hour. Then I checked every 15 minutes for the next two hours. It moved to 4.02 at 75 minutes and stayed there until the 150 minute mark. At the 150 minute check, it went to 4.03. It stayed there until almost 240 minutes, when it went to 4.04. At that point, the symbol indicating that the calibration needs to be run again appeared. I aborted the test due to my uncertainty with the initial calibration and resigned to try it again tomorrow.
When I complete that test, I'll put the results in a better spreadsheet format and graph them so they are usable by the forum.