Vlf Add-On Unit For Scilloscopes

EE 38 February 1987 VLF ADD-ON UNIT FOR OSCILLOSCOPES This is a low-cost storage unit enabling oscilloscope users to view signals with very long periods. Where the typical oscilloscope merely shows a slowly travelling spot in response to a VLF input signal, this add-on unit is intended to convert that instrument into a versatile chart recorder. The bandwidth of an oscillo- scope is generally considered one of its main technical characteristics. For obvious reasons, the relevant specifi- cation is generally featured close to the oscilloscope type indication on the front panel. Interesting as its bandwidth specification may be, the com- mon oscilloscope can not offer what appears to the user to be a continuously written trace, at in- put frequencies below some 10 Hz. The vast majority of oscillo- scopes is totally unsuited to study a process with a period time of, say, one minute. Even in the unlikely event of the instru- ment offering a timebase set- ting of 0.01 Hz /div., nothing ...