The HJT-K-6 type of electric ring was installed on a device with its vacuum of 0.133Pa. The voltage signal transported by this ring was measured under the circumstance with its temperature varied from 30℃ to 100℃, rotate speed of 0.16m/s, 0.32m/s,0.63m/s and 1.25m/s respectively. The voltage singal and the singal to noise were recorded by the X-Y recorder. The result shows that its noise will increase with the increasing of the temperature and the rotate speed. Its signal to noise is not less than 278∶1 even under the circumstance with its temperature of 100℃ and rotate speed of 1.25 m/s. It shows that the HJT-K-6 type of exact electric ring can transport the voltage signal well in the applications. Thus, it can be widely used under the similar circumstance.