The Photoelectric Photometer Attached to the I M Telescope

The stucture, performance indices and test observations of the photoelectric photometer attached to the 1-m telescope are introduced in the present article. A 1PZ 1 photomultiplier tube, a D. C. information amplifier of NWF-02 type, two sets of recording units, a digital voltmeter and a moving paper recorder are used. The effective wavelengths for yellow and blue light are respectively 5423 Å and 4275 Å . The linear relation of the amplifier is very well. The stable extent of the voltage between electrodes of the photomultiplier tube is 0.08%. The average accuracy of observations is 0.01 mag. This system accords with Johnson's B. V system approximately.