公开(公告)号：DE19615651C2

公开(公告)日：1999-08-05

申请号：DE19615651

申请日：1996-04-19

Applicant: ADVANTEST CORP

Inventor： MIYAMAE YOSHIAKI ,  TAKAOKU HIROAKI ,  AOYAMA OSAMU

IPC: G01R23/173

公开(公告)号：DE19615651A1

公开(公告)日：1996-10-24

申请号：DE19615651

申请日：1996-04-19

Applicant: ADVANTEST CORP

Inventor： MIYAMAE YOSHIAKI ,  TAKAOKU HIROAKI ,  AOYAMA OSAMU

IPC: G01R23/173

Abstract: The method involves converting the frequencies of an input signal using a super-imposed signal, detecting the converted output signal and sweeping through it to obtain an output signal based on frequency. Each of a number of measurement frequency ranges to be measured are swept at a low speed in sequence. Every non-measurement frequency range outside the measurement frequency range are swept at a speed higher than the low speed. The higher speed can be equal to the maximum sweep speed of the spectral analyser.

公开(公告)号：DE19635890C2

公开(公告)日：2001-10-18

申请号：DE19635890

申请日：1996-09-04

Applicant: ADVANTEST CORP

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

IPC: G01R23/16 ,  G01R29/26 ,  G01R23/20

公开(公告)号：DE19635890A1

公开(公告)日：1997-03-13

申请号：DE19635890

申请日：1996-09-04

Applicant: ADVANTEST CORP

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

IPC: G01R23/16 ,  G01R29/26 ,  G01R23/20

Abstract: The passband of two filters (19,24) is adjusted automatically so that a relationship between a waveform to be displayed (35) and a noise level or dynamic range is fulfilled. The bandwidth of a low-pass filter (27) for the output from a demodulator is set to one-tenth of the passband. A frequency span is fixed at three times the frequency interval. The frequency at which the highest peak level of the input signal occurs is found and selected as the central frequency of the display.

公开(公告)号：JPH0980094A

公开(公告)日：1997-03-28

申请号：JP23166295

申请日：1995-09-08

Applicant: ADVANTEST CORP

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

IPC: G01R23/173 ,  G01R23/20

Abstract: PROBLEM TO BE SOLVED: To properly measure three-dimensional distortion of a low level. SOLUTION: The input attenuation is made 0dB (S2 ), thereby it is made large by step 10dB and the three-dimensional distortion level L3 at this time is measured (S3 ). Next, the quantity of the input attenuation is changed to δATT=1dB, a three-dimensional distortion level L3 ' and a fundamental wave level L1 are measured and at the time a change quantity of the three- dimensional distortion level δDis =L3 -L3 ' is found. If the δDis is not within δATT±ε, it will be returned to (S3 ), furthermore the attenuation of 10dB is increased, and the similar method is performed. If the δDis is within δATT±ε, the three-dimensional distortion L3 ' at this time is made input and L1 -L3 '=ΔL represents the level difference between the fundamental wave and the three- dimensional distortion.

公开(公告)号：JPH0980092A

公开(公告)日：1997-03-28

申请号：JP23167895

申请日：1995-09-08

Applicant: ADVANTEST CORP

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

IPC: G01R23/173 ,  G01R29/26

Abstract: PROBLEM TO BE SOLVED: To automatically determine the pass band width(RBW) or the like of a spectrum analyzer by determining RBW of BPF on the basis of the frequency interval of a waveform to be displayed, the noise level or the like. SOLUTION: RBW of BPFs 19, 24 of a spectrum analyzer 15 is made a parameter, and RBW is determined from the frequency interval of the waveform to be displayed so as to satisfy the relation with the frequency interval of the waveform to be displayed and the noise level or the dynamic range of an input signal. In other words, a control part 31 reads the spectrum of the input signal from a buffer memory 29, detects a frequency with its maximum value and makes it a central frequency. The central frequency is stored in a parameter value storing part 36. When the central frequency is determined, the input signal is measured again so that the central frequency may be in the center of a display scope and stored in a buffer memory 29. A noise part to be measured is made an offset value, three times thereof a frequency span, and RBW of BPFs 19, 24 is determined.

公开(公告)号：JPH08201451A

公开(公告)日：1996-08-09

申请号：JP2744695

申请日：1995-01-24

Applicant: ADVANTEST CORP

Inventor： AOYAMA OSAMU ,  SATOU MITSUNORI

IPC: G01R23/173

Abstract: PURPOSE: To enhance the operability of user while facilitating the analysis and display by measuring the spectrum of a signal to be measured depending on the number of zoom screens and processing a display screen from a measurement data being stored. CONSTITUTION: A control section 95 controls the measurement sequentially depending on the number of zoom screens being provided from a set panel 66. The spectrum data of a signal 100 to be measured, being measured according to the specification of measurement corresponding to main and zoom display screens, is stored in a trace memory 72 and a data is obtained for each screen. A display data processing section 11 receives the number of screens N, the position of display screen and the size corresponding to given zoom parameters 12 from a panel 66. A data is also received from a corresponding memory 72 and the lateral axis/longitudinal axis is contracted or elongated depending on the size of display screen using butter memories 14a-14d corresponding to respective screens thus displaying 90 the data with each zoom screen size. With such constitution, a plurality of zoom screens can be displayed and compared thus enhancing the operation of user and facilitating the analysis and display.

公开(公告)号：JPH11281684A

公开(公告)日：1999-10-15

申请号：JP8419898

申请日：1998-03-30

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： AOYAMA OSAMU ,  SATO MITSUNORI ,  TORITSUKA HIROFUMI

IPC: G01R23/173

Abstract: PROBLEM TO BE SOLVED: To make it hard to have influence of 0 Hz signal in a frequency unknown signal mode as compared with the conventional, and to detect a low- frequency input signal.
SOLUTION: A measurable total frequency band is divided into a plurality of bands, a frequency resolution determination IF filter pass bandwidth(RBW) for obtaining an appropriate sweeping speed without being affected by 0 Hz signal for each band is determined and is stored in a region 42 of a storage part 41, a set of each divided band and RBW is read one by one, is set to a span-setting part 21 and an RBW-setting part 24 for sweeping and receiving an input frequency, the maximum level and frequency of the detection output are stored in a region 44, the maximum level LM out of the maximum levels being obtained for the entire divided bands and its frequency FM are searched, and the FM is set to a center frequency, and the LM is set to a reference level for observation with an observation frequency span.
COPYRIGHT: (C)1999,JPO

Abstract translation: 要解决的问题：与现有技术相比，难以在频率未知信号模式中产生0Hz信号的影响，并且检测低频输入信号。 解决方案：可测量的总频带被划分为多个频带，确定用于获得适当的扫频速度而不受每个频带的0Hz信号影响的频率分辨率确定IF滤波器通过带宽（RBW），并将其存储在区域 42，存储部分41的一组，每个分割频带的集合和RBW被逐个读取，被设置为跨度设置部分21和用于扫描和接收输入频率的RBW设置部分24，最大电平和频率 检测输出被存储在区域44中，搜索针对整个分割频带和其频率FM获得的最大电平中的最大电平LM，并且将FM设置为中心频率，并且将LM设置为 观测频率跨度的观测参考水平。

公开(公告)号：JPH0980100A

公开(公告)日：1997-03-28

申请号：JP23169195

申请日：1995-09-08

Applicant: ADVANTEST CORP

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

IPC: G01R23/173 ,  G01R29/26

Abstract: PROBLEM TO BE SOLVED: To simply show time progress of noise level change by displaying the spectrum waveform of an input signal on one half part of a display screen and displaying noise on the other half part in a time domain. SOLUTION: A carrier frequency is positioned in the center of the left half of a display screen, and frequencies upward and downward separated by an offset value fof from the carrier frequency on both ends, and each spectrum therebetween is displayed. In other words, a spectrum waveform (frequency region) is displayed. In addition, the level of noise of a frequency fN upward separated by the offset value fof from the carrier frequency is displayed in time domain on the right half part of the display screen. In spectrum display for the frequency region of the left half part, frequency sweep is performed at least between fc ±Fof in regard to an input signal, necessary parts are taken out from data taken in a backup memory and are displayed. Taken-in display of the data for the left part display and the other taken-in display of the data for the right part display are performed alternately.

公开(公告)号：JPH11304854A

公开(公告)日：1999-11-05

申请号：JP11043798

申请日：1998-04-21

Applicant: ADVANTEST CORP

Inventor： AOYAMA OSAMU ,  SATO MITSUNORI

IPC: G01R23/173

Abstract: PROBLEM TO BE SOLVED: To provide a spectrum analyzer, capable of performing data search for a limited range by simultaneously designating plural frequency zones in a measuring frequency range. SOLUTION: This spectrum analyzer for frequency sweeping through digital control is provided with a range designating means 73 to mask and designate frequency zones not subject to data search, a waveform data operation part 52 for waveform data processing based on the designated range by the range designating means 73, a processing means 72 for data search based on data generated by the waveform data operation part 52, and designated zone data by the range designating means 73, and a memory part 71 for memorizing the designated range data and search data processed by the processing means 72.