In the use of electronic strain electronic balances, temperature drift may be encountered, that is, due to temperature changes, the indication value of the balance at the initial loading is inconsistent with the indication value after a period of time. There are many reasons for temperature drift, such as temperature and humidity changes in the use environment, the length of warm-up time, the sensitivity of the internal sensors and electrical components of the balance to temperature and humidity (ie temperature drift coefficient), and so on. The higher the precision of the balance, the more obvious this phenomenon will be.
In response to this phenomenon, we conducted the following experiments:
Experiment 1: The effect of warm-up time on the balance indication.
Himalaya series precision electronic balance, temperature 16°C, equipped with constant temperature equipment, loaded with 200gF2 standard weight. Power on after 2 hours of storage indoors:
Time indication (g) data processing (g)
9:00199.96/
9:05200.02+0.06
9:15200.06+0.10
9:35200.07+0.11
At this time, it is uninstalled and 0.10g is displayed.
Change 0.06g in the first 5 minutes, change 0.04g in the next 10 minutes, change 0.01g in 20 minutes from 9:15 to 9:35. From this, it can be proved that with the increase of warm-up time, the indication value of the balance gradually tends to be stable; The indication value after unloading can still get the accurate reading of the load.
When the electronic balance was just moved from outdoor to indoor, due to the large temperature difference, the displayed value of the electronic balance changed greatly. It changed by 0.44g in the first 3 minutes, changed to 0.70g after 65 minutes, and changed to 0.26g in the next 62 minutes. From 15:30 to 15:59, the change was 0.06g in nearly half an hour. From this it can be proved that:
The greater the temperature difference, the greater the change in the display value of the electronic balance. As time goes by, the temperature inside the machine gradually approaches room temperature, and the display value of the electronic balance also tends to be stable.