最近翻一下自己的库存，翻出一台多年前购买一直闲置的网络/频谱分析仪，是安立ms-420b，工作频率10hz---30mhz，双路输入。通电后发现机器工作不太正常，主要问题就是按键版除了一两个键以外其他键没作用，所有功能不能输入执行。
由于时间和技术问题，我不打算自己花时间维修它了，我拆开看过，控制电路是一般的74系列ic和类似z80,6502类的cpu。
现在寻求高手接招，提供技术支持。
或者，3k卖了。
网上的介绍：
network / spectrum analyzer
anritsu ms420b specifications: ms420b. 10hz to 30mhz frequency range, 0.01hz frequency resolution, 2 channels (r and t) input channels, 75ohm / 1mohm selectable input impedance, wide measurable level range of over 150db, allowing the measured device to be checked at actual operational levels; high-performance synthesizer to enable high resolution measurements; high- speed measurement of 2ms/point useful for mass production of parts; high- precision group delay measurements; logarithmic frequency sweep; level sweep for non-linearity tests; variable input levels make the instrument suitable for characteristics tests; built-in gpib interface for remote control of front-panel functions; level calibration by using the output of the test-signal source; external mg440a synthesizer or mg443b slg can be connected to check frequency response of conversion loss at different input / output frequencies. call for further specifications on the ms420b.
the anritsu ms420b network/spectrum analyzer is used to analyze a network and spectrum and to measure magnitude, phase and group delay characteristics, level and frequency spectrum in a wide frequency range from 10hz to 30mhz and an impedance of 75 ohms. this instrument can be used to test communication lines and devices, test of audio, video devices, analysis of communication cable and optical fiber characteristics, and the analysis of element characteristics (l, c, r, resonator filter, semiconductor, etc.). amplitude: 100 db (0.01 db resolution); phase: ??80º (0.1º resolution); delay time: 0~400 ms (0.1 ns min. resolution); frequency logarithmic sweep; level sweep. additional features include the ability that all functions can be saved/recalled and that graphics (frequency characteristic) and characters can be displayed simultaneously on a large crt (6.5").
