Make sure your digital temperature sensor functions in "noisy" environments
If you have ever tried using a digital temperature sensor in a noisy environment, you know that it is almost impossible to accomplish. Electrical noise somehow creeps into the temperature sensing circuit system and can give unreliable results. A noisy environment can cause you to end up with results that you just cannot use.
Use a filter to eliminate excess noise
You may have considered using a filter in front of the digital temperature sensor. Believe it or not, using a filter successfully was not even a possibility until recently. This is because the function of the filter would inevitably interfere with the measuring technique of the digital temperature sensor. This resulted in errors reading the temperature. Thankfully, this is no longer a problem.
The best thing to do is to add the filter a close as possible to the digital temperature sensor's D+ and D- inputs and connect it. The filter has a cut off frequency of around 1.6 MHz. Just remember that if you fail to install a filter, you will wind up with error temperature readings.
Other obstacles to getting accurate digital temperature sensor readings
There are many other factors that can adversely affect digital temperature sensor readings as well. Any resistance that stands between the remote sensor and the digital temperature sensor will make getting an accurate temperature reading difficult. There is usually a 0.5 degree Celsius difference in the measured temperature of resistance with the digital temperature sensor.
Some applications are looking to receive and process digital temperature readings close to the sensor in order to get an unobstructed signal at the point of measurement. This procedure is supposed to eliminate problems with "signal integrity." However, taking this approach can also make supplying power to the circuit a problem. A deteriorating signal from the digital temperature sensor threatens to lower the measurement quality.
Digital temperature sensors and error components
No temperature measurement device is completely foolproof. This is certainly the case for digital temperature readings. Error readings can happen for a variety of reasons. One source to consider if the fact that there are so many different voltage variations that occur within the temperature measurement system. Also, if you are attempting to create a temperature controlled environment that allows rapid testing and calibration of the digital temperature sensor, you will find that it is almost impossible for the test environment to remain at a consistent temperature. This is an area where product improvements are necessary.
In the past a process known as the "oil bath test environment" was used to get the most accurate test result from a digital temperature sensor reading. However, this process is very inconvenient, slow and there is an issue surrounding the product cost involved.
Accurate readings are a must
Accuracy in temperature readings is very important - especially for digital temperature sensors and other devices that are being used in applications that are sold and utilized. Take the HVAC industry for example. Accurate temperature readings are important - especially since studies show that people can sense a one degree Celsius temperature change. A highly responsive digital temperature sensor is paramount under these circumstances.
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