Simple Test Method for Thermistor Air (1)
First, the purpose:
In the absence of dedicated NTC thermistor test instruments, meters and measuring fixtures, but also need to measure the NTC thermistor, the method provides a simple test method, although not up to the professional level of accuracy, but can Roughly measuring the resistance and accuracy of the thermistor.
Second, the measurement tools and materials:
1, four and a half multimeter: two.
2, test fixture: one.
3, ± 0.1 ℃ thermometer: one.
4, stainless steel alligator clip: a pair.
Third, the measurement methods and steps:
1, first with air conditioning will be a room temperature control at 25 ± 0.1 ℃.
2, the thermometer placed in the room, monitor the indoor temperature.
3, will be a pair of alligator clips were replaced in a pair of universal test table test table.
4, a standard thermistor two pin ends caught in the alligator clip, the end of the multimeter with a multimeter into the multimeter, open the multimeter to the resistance to measure the appropriate gear, then the multimeter shows the temperature at room temperature thermistor resistance value. (Note: nominal resistance accuracy of ± 0.1%, B value accuracy of ± 1%)
5, the alligator clip placed near the thermometer, this multimeter for monitoring the indoor temperature changes.
6, when monitoring the temperature of the multimeter shows relatively stable when the room temperature is relatively stable, this time can test the indoor temperature of the resistance, such as alligator clip for monitoring the resistance of the thermistor and the accuracy of the thermistor to be measured When the resistance accuracy is the same, the contrast measurement can be made.
7, to be measured thermistor can be tested at room temperature according to the standard resistance value of ± 5% range to determine whether qualified products.
Fourth, note:
1, the indoor temperature changes should be controlled within 25 ± 1 ℃ range. (The measurement must be closed doors and windows, reduce air flow, to avoid indoor staff access and walk back and forth).
2, when the temperature does not reach the control accuracy, the same resistance can be used for the sensitivity of the room temperature monitoring resistor for comparison measurement.
3, two multimeter in the measurement should be checked before the accurate, at least two tables of consistency checks.
4, the thermistor should be measured at room temperature should not be less than 30 minutes, if the product is tested after the use of power, please put it 12 hours after the test.
5, thermometer, monitoring with thermistor, measured resistance should be placed in the same room indoors to ensure accurate measurement.
6, test thermistor, the operator's hand as possible in the thermistor to maintain a certain distance, so as not to bring the human body temperature measurement error.
A Simple Test Method for NTC Thermistor in Air (2)
First, the purpose:
In the absence of dedicated NTC thermistor test instruments, meters and measuring fixtures, but also need to measure the NTC thermistor, the method provides a simple test method, although not up to the professional level of accuracy, but can Roughly measuring the resistance and accuracy of the thermistor.
Second, the measurement tools and materials:
1, four and a half multimeter: two.
2, a constant temperature oil pan: size (500 × 300 × 100) size can be customized, but not too small.
3, 0.1 ℃ accuracy thermometer.
4, stainless steel alligator clip a pair.
5, salad oil amount (to fill the oil pan is limited).
Third, the measurement methods and steps:
1, the constant temperature oil pan filled with salad oil. (Note: If you use stainless steel plate, please in the bottom of the pad 3 ~ 5mm plastic sheet for insulation layer).
2, the thermometer horizontal into the oil pan, (thermometer to be immersed in oil), scale up.
3, will be a pair of alligator clips were replaced in a pair of universal test table test table.
4, a standard thermistor two pin ends caught in the alligator clip, the end of the multimeter with a multimeter into the multimeter, open the multimeter to the resistance to measure the appropriate gear, then the multimeter shows the temperature at room temperature thermistor resistance value. (Note: nominal resistance accuracy of ± 0.1%, B value accuracy of ± 1%)
5, the alligator clip into the tank filled with salad oil, so that all the crocodile clamp and thermistor all immersed in the oil, the multimeter for monitoring oil tank oil temperature changes.
6, when monitoring the oil temperature of the multimeter shows a relatively stable value that when the oil temperature is more stable, this time can test the resistance of the oil temperature, such as alligator clip for monitoring the thermistor resistance and accuracy and heat When the resistance of the resistance is the same, the contrast measurement can be made.
Fourth, note:
1, oil pan oil temperature changes should be controlled within 25 ± 3 ℃ range. (The measurement must be closed doors and windows, reduce air flow, to avoid indoor staff access and walk back and forth).
2, when the temperature does not reach the control accuracy, the same resistance can be used for the accuracy of thermistor for oil temperature monitoring resistor for comparative measurement.
3, two multimeter in the measurement should be checked before the accurate, at least two tables of consistency checks.
4, thermistor to be measured in the oil temperature should be not less than 2 minutes, and to all immersed in oil.
5, the temperature probe, monitoring with a thermistor, the resistance should be measured in the oil tank placed in the same seat to ensure the accuracy of the measurement.
First, the purpose:
In the absence of dedicated NTC thermistor test instruments, meters and measuring fixtures, but also need to measure the NTC thermistor, the method provides a simple test method, although not up to the professional level of accuracy, but can Roughly measuring the resistance and accuracy of the thermistor.
Second, the measurement tools and materials:
1, four and a half multimeter: two.
2, test fixture: one.
3, ± 0.1 ℃ thermometer: one.
4, stainless steel alligator clip: a pair.
Third, the measurement methods and steps:
1, first with air conditioning will be a room temperature control at 25 ± 0.1 ℃.
2, the thermometer placed in the room, monitor the indoor temperature.
3, will be a pair of alligator clips were replaced in a pair of universal test table test table.
4, a standard thermistor two pin ends caught in the alligator clip, the end of the multimeter with a multimeter into the multimeter, open the multimeter to the resistance to measure the appropriate gear, then the multimeter shows the temperature at room temperature thermistor resistance value. (Note: nominal resistance accuracy of ± 0.1%, B value accuracy of ± 1%)
5, the alligator clip placed near the thermometer, this multimeter for monitoring the indoor temperature changes.
6, when monitoring the temperature of the multimeter shows relatively stable when the room temperature is relatively stable, this time can test the indoor temperature of the resistance, such as alligator clip for monitoring the resistance of the thermistor and the accuracy of the thermistor to be measured When the resistance accuracy is the same, the contrast measurement can be made.
7, to be measured thermistor can be tested at room temperature according to the standard resistance value of ± 5% range to determine whether qualified products.
Fourth, note:
1, the indoor temperature changes should be controlled within 25 ± 1 ℃ range. (The measurement must be closed doors and windows, reduce air flow, to avoid indoor staff access and walk back and forth).
2, when the temperature does not reach the control accuracy, the same resistance can be used for the sensitivity of the room temperature monitoring resistor for comparison measurement.
3, two multimeter in the measurement should be checked before the accurate, at least two tables of consistency checks.
4, the thermistor should be measured at room temperature should not be less than 30 minutes, if the product is tested after the use of power, please put it 12 hours after the test.
5, thermometer, monitoring with thermistor, measured resistance should be placed in the same room indoors to ensure accurate measurement.
6, test thermistor, the operator's hand as possible in the thermistor to maintain a certain distance, so as not to bring the human body temperature measurement error.
A Simple Test Method for NTC Thermistor in Air (2)
First, the purpose:
In the absence of dedicated NTC thermistor test instruments, meters and measuring fixtures, but also need to measure the NTC thermistor, the method provides a simple test method, although not up to the professional level of accuracy, but can Roughly measuring the resistance and accuracy of the thermistor.
Second, the measurement tools and materials:
1, four and a half multimeter: two.
2, a constant temperature oil pan: size (500 × 300 × 100) size can be customized, but not too small.
3, 0.1 ℃ accuracy thermometer.
4, stainless steel alligator clip a pair.
5, salad oil amount (to fill the oil pan is limited).
Third, the measurement methods and steps:
1, the constant temperature oil pan filled with salad oil. (Note: If you use stainless steel plate, please in the bottom of the pad 3 ~ 5mm plastic sheet for insulation layer).
2, the thermometer horizontal into the oil pan, (thermometer to be immersed in oil), scale up.
3, will be a pair of alligator clips were replaced in a pair of universal test table test table.
4, a standard thermistor two pin ends caught in the alligator clip, the end of the multimeter with a multimeter into the multimeter, open the multimeter to the resistance to measure the appropriate gear, then the multimeter shows the temperature at room temperature thermistor resistance value. (Note: nominal resistance accuracy of ± 0.1%, B value accuracy of ± 1%)
5, the alligator clip into the tank filled with salad oil, so that all the crocodile clamp and thermistor all immersed in the oil, the multimeter for monitoring oil tank oil temperature changes.
6, when monitoring the oil temperature of the multimeter shows a relatively stable value that when the oil temperature is more stable, this time can test the resistance of the oil temperature, such as alligator clip for monitoring the thermistor resistance and accuracy and heat When the resistance of the resistance is the same, the contrast measurement can be made.
Fourth, note:
1, oil pan oil temperature changes should be controlled within 25 ± 3 ℃ range. (The measurement must be closed doors and windows, reduce air flow, to avoid indoor staff access and walk back and forth).
2, when the temperature does not reach the control accuracy, the same resistance can be used for the accuracy of thermistor for oil temperature monitoring resistor for comparative measurement.
3, two multimeter in the measurement should be checked before the accurate, at least two tables of consistency checks.
4, thermistor to be measured in the oil temperature should be not less than 2 minutes, and to all immersed in oil.
5, the temperature probe, monitoring with a thermistor, the resistance should be measured in the oil tank placed in the same seat to ensure the accuracy of the measurement.
