Patent ID: 8332171
Filing Date: 2012-12-11
Classification: G01R

Abstract:
1. A waveform observing apparatus, comprising a buffer memory for temporarily storing sampled measured data, a measured data file creating device for creating a measured data file in a body memory in a predetermined filing creation cycle, to house measured data temporarily stored in the buffer memory, and a display section for displaying measured data in waveform, the apparatus including; a device for processing measured data immediately before stoppage, which houses measured data, temporarily stored in the buffer memory immediately before stoppage of the sampling and not housed in the measured data file, into a file for measured data immediately before stoppage that is created in the body memory at the time of stoppage of the sampling; a compression ratio setting device for setting a compression ratio at which a waveform to be displayed in the display section is reduced and displayed; a compressed data calculating device for calculating compressed data based upon the number of pieces of measured data required for drawing one display dot in the display section correspondingly to the compression ratio, from measured data temporarily stored in the buffer memory with respect to each number of pieces of data; a compressed-data file for display creating device for creating a compressed-data file for display in the body memory; a compressed data storing device for putting and storing the compressed data calculated by the compressed data calculating device into the compressed-data file for display; a final compressed data processing device for calculating final compressed data immediately before stoppage of the sampling based upon the measured data of a fraction temporarily stored in the buffer memory immediately before stoppage of the sampling and not housed in the compressed-data file for display, to put and store the calculated data into the compressed-data file for display; a device for calculating the number of pieces of difference data, which calculates the number of pieces of difference data between the number of pieces of data used for calculating the compressed data immediately before stoppage of the sampling and the number of pieces of measured data required for drawing one display dot correspondingly to the compression ratio when the sampling is resumed; and a top compressed data processing device, which calculates top compressed data processing device immediately after resuming of the sampling based upon measured data in the number of pieces of difference data when the number of pieces of measured data temporarily stored in the buffer memory immediately after resuming of the sampling reaches the number of pieces of difference data, to put and store the calculated data into the compressed-data file for display.