What is the temperature drift phenomenon? How can we avoid the effect of temperature drift on the measurement?
In the use of electronic strain-type electronic balance, may encounter the phenomenon of temperature drift, that is, due to changes in temperature, resulting in the initial load when the balance of the value and after a period of time after the indication is inconsistent. There are many reasons for the phenomenon of temperature drift, such as the use of environmental temperature and humidity changes, the length of the boot warm-up time, balance internal sensors and electrical components of the temperature and humidity sensitivity (ie, temperature drift coefficient) and so on. The higher the accuracy of the balance, the more obvious this phenomenon.
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In response to this phenomenon, our company has done the following experiment:

Experiment 1: The effect of warm-up time on the scale indication.
JY2002 (200g / 0.01g) type electronic balance, temperature 16 ℃, a constant temperature equipment, load 200g F2 standard weight. indoors
Save 2 hours after the boot:
Time indication (g) Data processing (g)
9:00 199.96 /
9:05 200.02 +0.06
9:15 200.06 +0.10
9:35 200.07 +0.11
At this point unloading, display 0.10g.
The first 5 minutes change 0.06g, after the change within 10 minutes 0.04g, from 9:15 to 9:35, 20 minutes change 0.01g. Which can prove that with the warm-up time increases, the balance of the indication gradually stabilized; also proved that although the initial loading of the indication and a period of time after the indication is inconsistent, but as long as the unloading before the indication minus After unloading the indication, the exact reading of the load can still be obtained.
Experiment 2: Effect of temperature difference on the value of the balance.
The test tool is the same as above. The balance from the outdoor to the indoor, outdoor temperature of 2 ℃, the indoor temperature of 18 ℃, humidity 63% RH, the temperature difference of 16 ℃, a constant temperature equipment. Immediately boot, measured data as follows:
Time indication (g) Data processing (g)
14:25 200.00 /
14:28 200.44 +0.44
At this point unloading, show 0.45g +0.45
Not peeled, reloaded
15:30 200.70 +0.70
15:59 200.76 +0.76
At this point unloading, display 0.76g +0.76
Set to zero after loading
16:00 200.00 0.00
16:20 200.00 0.00
When the balance just moved from the outside to the interior, due to the larger temperature difference, the balance shows a larger change, the first 3 minutes changed 0.44g, 65 minutes after the change of 0.70g, 62 minutes after the change of 0.26g, from 15: 30 to 15:59, nearly half an hour changed 0.06g. This proves that:

1. The greater the temperature difference, the greater the change in the value of the balance, with the passage of time, the machine temperature gradually close to room temperature, the balance also tends to smooth.
2. Although the effect of temperature difference, so that changes in the value, but the balance of the sensitivity did not change. That is, when the temperature difference, the initial load when the indication and the temperature difference when the initial load when the indication is almost unchanged.
3 .. before unloading the value - after unloading the value = the initial loading of the show.

The balance should be used as far as possible under conditions where the ambient temperature is more stable (no more than 5 ° C per hour). But the user may be in the air conditioning just started, the sun straight, the balance from the outside to the indoor, indoor and outdoor and other wide temperature difference, you need to use:
1. Balance At this point, the following methods can be used to reduce the measurement error.
2. As far as possible to extend the warm-up time. The greater the temperature difference, the longer the warm-up time, generally should be 30 minutes to 2 hours.
3 .. before using the standard weight correction, I produced the JY series of electronic balance correction weight should reach more than M1 level.
4. The time should be fixed after loading. Such as the five seconds after the load to read or are displayed in units of the value of the show.
5. Multiple measurements, whichever is the average (3 to 5 times).