How to avoid the temperature drift of electronic balance and how to change its influence on measurement

In the use of electronic strain balance, the phenomenon of temperature drift may be encountered, that is, due to the change of temperature, the display value of the balance at the initial loading is inconsistent with that after a period of time There are many reasons for the phenomenon of temperature drift, such as the change of temperature and humidity in the use environment, the length of preheating time, the sensitivity of internal sensors and electrical components of the balance to temperature and humidity (i.e temperature drift coefficient), etc The higher the accuracy of the balance, the more obvious the phenomenon is In view of this phenomenon, we have done the following experiments: Experiment 1: the influence of preheating time on the display value of the balance Himalaya series precision electronic balance, temperature 16 ℃, constant temperature equipment, loading 200gf2 standard weight Start up after 2 hours storage in the room: time indication (g) data processing (g) 9:00199.96 / 9:05200.02 + 0.06 9:15200.06 + 0.10 9:35200.07 + 0.11 Now unload and display 0.10g 0.06g in the first 5 minutes, 0.04g in the next 10 minutes, from 9:15 to 9:35, and 0.01g in 20 minutes It can be proved that with the increase of preheating time, the display value of the balance tends to be stable gradually It is also proved that although the display value at the initial loading is inconsistent with that after a period of time, as long as the display value before unloading is subtracted from the display value after unloading, the accurate load reading can be obtained Experiment 2: the influence of temperature difference on the display value of electronic balance The test tools are the same as above The electronic balance is moved from outdoor to indoor, the outdoor temperature is 2 ℃, the indoor temperature is 18 ℃, the humidity is 63% RH, that is, the temperature difference is 16 ℃, with constant temperature equipment Start the machine immediately, and the measured data are as follows: time indication (g) data processing (g) 14:25200.00 / 14:28200.44 + 0.44, unload now, display 0.45g + 0.45 without peeling, reload at 15:30200.70 + 0.70, display 15:59200.76 + 0.76, unload now, display 0.76g + 0.76 zero, load at 16:00200.000.00, 16:20200.000.00 When the electronic balance just moved from the outdoor to the indoor, due to the large temperature difference, the display value of the electronic balance changed greatly It changed 0.44g in the first three minutes, 0.70g in 65 minutes, that is, 0.26g in the last 62 minutes, from 15:30 to 15:59, and changed 0.06g in nearly half an hour It can be proved that: 1 The greater the temperature difference, the greater the change of the value of the electronic balance With the passage of time, the temperature in the machine gradually approaches the room temperature, and the value of the electronic balance tends to be stable.