公开(公告)号：JPH08292218A

公开(公告)日：1996-11-05

申请号：JP9668295

申请日：1995-04-21

Applicant: ADVANTEST CORP

Inventor： MIYAMAE YOSHIAKI ,  TAKAOKU HIROAKI ,  AOYAMA OSAMU

IPC: G01R23/173

Abstract: PURPOSE: To accurately measure the leakage electric power of adjacent channel while a burst signal is issued. CONSTITUTION: When a transfer frequency is inputted through a keyboard 23, a CPU 24 sets total sweep frequencies F0 to F7 , lower measuring ranges F1 and F2 , central measuring ranges F3 and F4 , upper-side measuring ranges F5 and F6 , non-measuring ranges among them, and respective sweep times t1 and t2 of the non-measuring ranges and measuring ranges in a memory 49, and reads out them one by one successively, then it sets a DDS 42, ramp voltage generator 27 and divider 25. '1' is stored at the change indication point of the respective ranges in a RAM 51 and the non-measuring ranges are swept at the maximum speed, while the measuring ranges are swept on each indication point at a low speed for the same duration as the repetitive cycle of burst. When '1' is read out from the RAM 51, it interrupts the CPU 24, and the CPU 24 reads out the memory 49 so as to set the next set.

公开(公告)号：JPH06160443A

公开(公告)日：1994-06-07

申请号：JP31367092

申请日：1992-11-24

Applicant: ADVANTEST CORP

Inventor： NAGANO MASAO ,  AOYAMA OSAMU

IPC: G01R21/00 ,  G01R29/00 ,  G01R29/08 ,  H04B17/00 ,  H04B17/23 ,  H04B17/354

Abstract: PURPOSE:To accurately measure leakage power of signals transmitted through a filter from an adjacent channel. CONSTITUTION:After setting a symbol rate and roll factor (1), a measurement execution key is pressed (2). Correction data for a route Nyquist filter are prepared from the set constants (3) and the total sum of electric energy is found from displayed waveform data (4). The displayed waveform data of a lower adjacent channel are corrected by weighting the data with the above- mentioned correction (5) and the sum of electric energy is found by integrating the corrected results (6). About an upper adjacent channel, the sum of electric energy is similarly found (7) and (8). The leakage power (ratio) between the lower and upper adjacent channels is calculated by dividing the sum of electric energy of the lower and upper adjacent channels by the total electric energy (9) and displayed on a display (10).

公开(公告)号：JPH07134151A

公开(公告)日：1995-05-23

申请号：JP27978293

申请日：1993-11-09

Applicant: ADVANTEST CORP

Inventor： YAMAGUCHI TAKAHIRO ,  FUKUI TAKAMASA ,  KASAHARA TOSHIHARU ,  YAMASHITA KOICHI ,  AOYAMA OSAMU ,  KOSUGE TAKASHI ,  MIYAMAE YOSHIAKI ,  TAKAOKU HIROAKI

IPC: G01R23/16 ,  G01R23/173

Abstract: PURPOSE:To store analytical conditions for high speed measurement and a plurality of precise measurements in an analytical condition memory means, successively store each analytical condition in each setting memory means, read the results obtained by frequency analysis according to respective analytical conditions into an image memory, and display a plurality of measurement results on one screen. CONSTITUTION:An analytical condition file for high speed measurement is stored in the memory area 200A of an analytical condition memory means 200, and analytical condition files for precise measurement are stored in the memory area 200B-200D. After the analytical conditions are stored in each memory area 200A-200D, the mode is switched to automatic measurement mode. A controller 115 successively reads the analytical condition files for high speed measurement and precise measurement, temporarily stores them in setting memory means 106, 107, 112, 117, 118, and performs frequency analysis according to the analytical conditions. The results are stored in four memory areas of an image memory 300. Thus, one or a plurality of the measurement results can be displayed in one screen of an indicator 301.