公开(公告)号：EP0547228A4

公开(公告)日：1994-07-13

申请号：EP92910579

申请日：1992-05-26

Applicant: ADVANTEST CORP

Inventor： HIROSE MASAAKI ,  KATOH KAZUO ,  UEKI YUTAKA ,  HIRAKOSO YOHEI ,  SATOH MITSUNORI ,  KOSUGE TAKASHI

IPC: G01R19/00 ,  G01R29/08 ,  G01R29/26

CPC classification number: G01R19/003 ,  G01R29/0892 ,  G01R29/26

公开(公告)号：DE69228232T2

公开(公告)日：1999-07-08

申请号：DE69228232

申请日：1992-05-26

Applicant: ADVANTEST CORP

Inventor： HIROSE MASAAKI ,  KATOH KAZUO ,  UEKI YUTAKA ,  HIRAKOSO YOHEI ,  SATOH MITSUNORI ,  KOSUGE TAKASHI

IPC: G01R19/00 ,  G01R29/08 ,  G01R29/26

Abstract: An apparatus for measuring the intensity of an interfering electromagnetic wave, specifically for measuring the average value of impulsive noises in a short time accurately. In the apparatus, impulsive noises, inputted through a variable attenuator (12), a frequency converter (13), an intermediate-frequency amplifier (15), a band-pass filter (16) of 9 KHz or 120 KHz are inputted into a linear detector (17). The detected outputs are passed through a low-pass CR filter (31) whose cut-off frequency is tens of thousands of hertz to lower their peak values and to widen their width. The output of the filter is converted into digital signal by an A/D converter (33), and digital values at respective sampling points in one frame of the digital signals are summed by a computing circuit (34). Then, the summation value thereof is divided by the number of samples to obtain the average value and the result is displayed.

公开(公告)号：DE69228232D1

公开(公告)日：1999-03-04

申请号：DE69228232

申请日：1992-05-26

Applicant: ADVANTEST CORP

Inventor： HIROSE MASAAKI ,  KATOH KAZUO ,  UEKI YUTAKA ,  HIRAKOSO YOHEI ,  SATOH MITSUNORI ,  KOSUGE TAKASHI

IPC: G01R19/00 ,  G01R29/08 ,  G01R29/26

Abstract: An apparatus for measuring the intensity of an interfering electromagnetic wave, specifically for measuring the average value of impulsive noises in a short time accurately. In the apparatus, impulsive noises, inputted through a variable attenuator (12), a frequency converter (13), an intermediate-frequency amplifier (15), a band-pass filter (16) of 9 KHz or 120 KHz are inputted into a linear detector (17). The detected outputs are passed through a low-pass CR filter (31) whose cut-off frequency is tens of thousands of hertz to lower their peak values and to widen their width. The output of the filter is converted into digital signal by an A/D converter (33), and digital values at respective sampling points in one frame of the digital signals are summed by a computing circuit (34). Then, the summation value thereof is divided by the number of samples to obtain the average value and the result is displayed.