TWP-W103 Metal Specific Heat Capacity Measuring Instrument Introduction: This experimental device improves and enhances the heating device, metal sample chamber and the temperature measurement and placement of metal samples. The thermocouple made of common copper constantan is used to measure the temperature of the sample. When the cold end is the freezing point, the secondary instrument for measuring the thermal potential difference of the thermocouple consists of a highly sensitive, high-precision, low drift amplifier plus a three and a half digit digital voltmeter. The millivolt displayed by the digital voltmeter corresponds to the temperature value to be measured. The full range of the digital voltmeter of the instrument including the amplification circuit is 20mV. The heating device can lift and move freely. The tested sample is placed in a windproof cylinder with large capacity, namely the sample chamber, which is used to keep the sample higher than the room temperature cool naturally. In this way, the repeatability of the results is good, the measurement error can be reduced, and the experimental accuracy can be improved. This experiment can measure the specific heat capacity of metals at various temperatures from room temperature to 200 ℃. The instrument mainly consists of the following parts: 1. The heat source is made of 75W electric soldering iron, which is supported and fixed by the chassis and can move up and down; 2. The experimental sample is a small cylinder with a diameter of 5 mm and a length of 30 cm. A deep hole is drilled at the bottom to facilitate the placement of thermocouples, and the cold end of the thermocouple is placed in the ice water mixture; 3. Copper constantan thermocouple; 4. Thermocouple bracket; 5. Windproof container; 6. Three and a half digit voltmeter. Experiment items: 1. Learn how to measure temperature with copper constantan thermocouple. 2. Learn to measure the specific heat capacity of different metal samples by cooling method. Technical parameters: 1. Three and a half digit digital voltmeter, measuring range: 0-20mV, resolution: 0.01mV, accuracy: ± 0.3% reading+1 word. 2. The heater power is 75W. 3. The sensor adopts copper constantan thermocouple. 4. The percentage difference between the measured specific heat capacity and the recognized value is less than 5%. 5. Input AC voltage 220V ± 10%. 6. The power supply is about 90W.
This experiment can measure the specific heat capacity of metals at various temperatures from room temperature to 200 ℃.
