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WJT-304 thermal resistance calibration device is the latest product which uses computer new technology. It is easy to operate and clear for man-machine dialogue.

The testing and detecting of this device is used potentiometer testing and comparison method that is direct compare standard resistance, second-class standard platinum resistance with tested thermal resistance. As the key component of this device use high stability, digital voltmeter, standard resistor, current source, etc. and use special technical measures, it is ensure the accuracy of the system is not less than 0.005.

 

Working condition

The temperature to ensure accuracy：20±2℃

Ambient temperature：　12～28℃

RH：　　　30～80﹪

Atmosphere pressure：　　　94～109Kpa

Power supply：　　　　　220V　AC±1﹪　50HZ±1﹪

Dimension and weight：

Computer Measurement System：L×D×H　140×70×120cm,weight：70Kg

0℃ and 100℃ temperature source：L×D×H　70×50×80 cm，weight：30 Kg

Device composition：

Computer:：It is domestic brands of Pentium machine or other brand of the same class.

High precision digital multimeter：Six semi-digital multimeter

a. resolution：0.1mV

b. accuracy：±0.005﹪reading±0.0035﹪range

control platform：

it is compose of working platform and control box。

Control box includes constant current source components, switch parts, DC power supply, and standard resistance, such as second-class standard platinum resistance

printer：24 needle printer

0℃ temperature resource：It is composed of mixer and freezing.

100℃temperature resource：It is composed of boiling point of water tanks, heating elements and Thermometer etc.

100℃ temperature error：Deviate 100℃<=±2℃

100℃ temperature stability：temperature change ≤0.04℃ every 10 minutes

100℃ Temperature field uniformity：Max. level differential temperature ≤0.01℃

Accuracy grade：0.005 grades

Pieces of tested thermal resistor：1～4 pieces