The Q8381A/Q8383 is an optical spectrum analyzer of the decentralized spectrum method employing diffraction lattice monochrometor. its main features are given below. Features Φ Wide dynamic range Wide dynamic range in the Q8381A is obtained by an optical design to suppress an internal stray light level. The range of 40 dB in a state 1 nm away from peak wavelength. The range of 50 dB in a state 5 nm away from peak wavelength. Wide dynamic range in the Q8383 is obtained by the adoption of doubie-pass monochrometor. The range of 55 dB in a state 0.5 nm away from peak wavelength. The range of 65 dB in a state 1 nm away from peak wavelength. 0 High-speed measurement High-speed measurement can be done by the adoption of the high-speed drive system which controls the rotation of the diffraction lattice. (SWEEP-MODE: NORMAL) 0.8 seconds or less in 200 nm span. 1.5 seconds or less in 500 nm span. Puise fight measurement The Q8381A/G8383 incorporates the AMP system for high-speed measurement of light pulse under te s t By synchronizing measurement by the external TTL signal, more stable spectrum can be obtained. @ Easy operation and abundant functions Various aspects have been taken into consideration to make measurement easier. The panel key arrangement, softkey menus and basic key functions can be specified in the first hierarchy. They include four types of spectral width measurement functions, power monitor function, cursor function, and various display (3-dimensional data, dual screen, and super-impose). (§) Built-in high-speed printer Measurement data can be easily output using a high-speed thermal printer having a printing speed of less than 8 seconds. © Enhanced memory function 3.5 inch floppy disks in accordance with MS-DOS* form at in addition to 32 data memories (battery backup) are equipped normally. The measurement data by an outside computer can be easily analyzed.