參數(shù)資料
型號(hào)： DS1923-F5
英文描述： Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
中文描述： Hygrochron溫度/濕度記錄儀與8KB數(shù)據(jù)記錄存儲(chǔ)器iButton的
文件頁數(shù)： 50/52頁
文件大小： 495K
代理商： DS1923-F5
DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
Step 1. Preparation
For the humidity data in the calibration memory, the lower four bits of each low byte are set to 0. This simplifies the
conversion from the binary data format to raw %RH values to a one-line equation.
Hr1 = ((Hr1H * 256 + Hr1L) * 5.02/65536 - 0.958)/0.0307
Hr2 = ((Hr2H * 256 + Hr2L) * 5.02/65536 - 0.958)/0.0307
Hr3 = ((Hr3H * 256 + Hr3L) * 5.02/65536 - 0.958)/0.0307
Hc1 = ((Hc1H * 256 + Hc1L) * 5.02/65536 - 0.958)/0.0307
Hc2 = ((Hc2H * 256 + Hc2L) * 5.02/65536 - 0.958)/0.0307
Hc3 = ((Hc3H * 256 + Hc3L) * 5.02/65536 - 0.958)/0.0307
Err1 = Hc1 - Hr1
Err2 = Hc2 - Hr2
Err3 = Hc3 - Hr3
B =
[(Hr2
2
- Hr1
2
) * (Err3 - Err1) + Hr32*(Err1 - Err2) + Hr12 * (Err2 - Err1)]/[(Hr2
2
- Hr1
2
) * (Hr3 - Hr1) + (Hr3
2
-
Hr1
2
) * (Hr1 - Hr2)]
A =
[Err2 - Err1 + B * (Hr1 - Hr2)] / (Hr2
2
- Hr1
2
)
C =
Err1 - A * Hr1
2
- B * Hr1
Step 2. Execution
Hc = ((HcH * 256 + HcL) * 5.02/65536 - 0.958)/0.0307
Hcorr = Hc - (A * Hc
2
+ B * Hc + C)
Numerical Correction Example
50 of 52
(convert from binary to %RH)
(convert from binary to %RH)
(the actual correction)
Converted Data from Calibration Memory
Hr1 = 20%RH
Hr2 = 60%RH
Hr3 = 90%RH
Hc1 = 17.65%RH
Hc2 = 56.41%RH
Hc3 = 89.57%RH
Error Values
Err1 = -2.35%RH
Err2 = -3.59%RH
Err3 = -0.43%RH
Resulting Correction Coefficients
B = -0.186810
A = 0.001948/%RH
C = 0.607143%RH
Application of Correction Coefficients to Sample Reading
Hc = 8.9%RH
Hcorr = 9.8%RH
NOTE:
The software correction requires floating point arithmetic (24-bit or better). Suitable math libraries for
microcontrollers are found on various websites and are included in cross-compilers.
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