公开(公告)号：JPH01167621A

公开(公告)日：1989-07-03

申请号：JP32826387

申请日：1987-12-23

Applicant: NIPPON TELEGRAPH & TELEPHONE ,  ADVANTEST CORP

Inventor： YAMASHITA KATSUYA ,  NIKI NAOHARU ,  YAMAGUCHI TAKAHIRO ,  NAKANISHI TORU ,  ARAKAWA NORIO

IPC: G01J3/45

Abstract: PURPOSE:To obtain an accurate spectrum curve by converting the output of a detector into a digital signal, imposing orthogonal modulation on it and finding the instantaneous phase of a local signal having a specific optical path difference, and rotating measurement data by the instantaneous phase. CONSTITUTION:The interference light of a Michelson interferometer 13 is supplied to a detector 18. The output signal of the detector 18 is converted by an AD converter 21 into the digital signal, which is supplied to digital frequency converters 23A and 23B for orthogonal conversion. The converted signals have their higher harmonic components cut by digital filters 24A and 24B and are stored in a complex memory 26 by specific optical path differences. Data obtained when there is no optical path difference are read out, an instantaneous phase detecting means finds the instantaneous phase, and a phase rotating means 33 rotates the phase of each data. An averaging means 34 averages the data and supplies the result to a Fourier transformer 27.

公开(公告)号：JPS62180228A

公开(公告)日：1987-08-07

申请号：JP2465986

申请日：1986-02-05

Applicant: ADVANTEST CORP

Inventor： ARAKAWA NORIO ,  YAMAGUCHI TAKAHIRO ,  WATANABE SHINICHI ,  NIKI NAOHARU

IPC: G01J3/02 ,  G01J3/28 ,  G01J3/45 ,  G01R23/16

Abstract: PURPOSE:To display a spectrum with resolution at almost equal intervals over the entire wavelength range by making the power of power converting circuit different and displaying the spectrum of nearly equal wavelength resolution. CONSTITUTION:A desired measurement range is set with a lower-limit wavelength and an upper-limit wavelength within a wavelength range prescribed by a setting means 21. Those lower-limit and upper-limit wavelengths are converted by a wavelength-frequency converting means 17A to corresponding frequencies. Then, a deciding means 17B decides whether or not a prescribed switching frequency is present in the set range. When the frequency is present, a band calculating means 17C calculates the 1st band width between the frequency corresponding to the short-wavelength side lower-limit wavelength and the switching frequency and the 2nd band width between the switching frequency and the frequency corresponding to the longer-wavelength side upper-limit wavelength. A resolution correcting means 17D uses the 1st and the 2nd band widths to process respective thinning-out rates found on the short-wavelength and long-wavelength sides and data fetched at a center frequency by Fourier transform 18, and the data are displayed 9.

公开(公告)号：JP2006350955A

公开(公告)日：2006-12-28

申请号：JP2005179755

申请日：2005-06-20

Applicant: ADVANTEST CORP

Inventor： ARAKAWA NORIO

IPC: G06F11/36 ,  G06F21/22

Abstract: PROBLEM TO BE SOLVED: To detect a fault of a computer caused by an unexpected factor such as a new computer virus. SOLUTION: A program data comparison part 134 determines a checksum from a program (an operating system and application programs) recorded in a program recording part 110, to compare with an initial state program (program in a measurement apparatus 1 when shipped) recorded in an initial state program data recording part 132. From this comparison result, a fault determination part 144 determines whether a fault occurs in a program (for example, infection by computer virus, or program erasure caused by an error of a user using the measurement apparatus 1) recorded in the program recording part 110. Specifically, when the checksum does not match, it is determined that the program is faulty. COPYRIGHT: (C)2007,JPO&INPIT

公开(公告)号：JP2004138465A

公开(公告)日：2004-05-13

申请号：JP2002302592

申请日：2002-10-17

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

Inventor： ARAKAWA NORIO

IPC: G01R27/28

Abstract: PROBLEM TO BE SOLVED: To enable the port of an object to be measured to easily correspond to measurement data in a measuring apparatus for measuring the object to be measured having a plurality of ports.
SOLUTION: An S parameter related to the I/O terminals of the measuring apparatus, such as S11 and S22, is converted to notation, such as S
ATN-ATN' and S
Tx-Tx , corresponding to the ports of the object to be measured, such as ATN and Tx, and the measurement data are allowed to easily correspond to the port of the object to be measured.
COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2001211171A

公开(公告)日：2001-08-03

申请号：JP2000019570

申请日：2000-01-28

Applicant: ADVANTEST CORP

Inventor： ARAKAWA NORIO ,  MIYAJIMA ATSUSHI

IPC: G09C1/00 ,  G06F21/00 ,  G06F21/20 ,  G11B20/00 ,  H04L9/32 ,  G06F15/00

Abstract: PROBLEM TO BE SOLVED: To provide an equipment authentication device which authenticates equipment such as a computer and a measuring instrument having equipment numbers such as serial numbers. SOLUTION: This device is equipped with a software ciphering part 36 which receives a serial number and ciphers the received serial number as an open key by an open key system, a ciphered data transmission part 38 which sends the ciphered serial number, and a received serial number deciphering part 16 which receives the ciphered serial number and deciphers the ciphered serial number by using a secret key corresponding to the serial number as the open key, so only when the serial number is given correctly, the deciphering by the received serial number deciphering part 16 is successful. Therefore, the accurate serial number of a device can be obtained to authenticate the device.

公开(公告)号：JP2001033499A

公开(公告)日：2001-02-09

申请号：JP20615999

申请日：1999-07-21

Applicant: ADVANTEST CORP

Inventor： ARAKAWA NORIO ,  UBUKATA KEIICHI ,  ABIKO NORIHIDE

IPC: G01R27/28 ,  G01R23/173 ,  G01R29/22 ,  G01R31/00

Abstract: PROBLEM TO BE SOLVED: To provide a network analyzer which switches an attenuator and preamplifier corresponding to an output power to easily and automatically measure while setting an optimum resolution bandwidth when measuring by changing power of a signal applying to a measured device in a wide range. SOLUTION: A network analyzer measuring by changing power of a signal applying to a measured device, obtains a maximum input power level from error compensation data in a through-characteristic, a switching point between an attenuator and preamplifier in an output level is determined from relation between a maximum input power level of the error compensation data in the through-characteristic and an input power. Resolution bandwidth is determined so that requested S/N ratio and sweeping time corresponding to the switching point between the attenuator and preamplifier.

公开(公告)号：JPH11183656A

公开(公告)日：1999-07-09

申请号：JP35781797

申请日：1997-12-25

Applicant: ADVANTEST CORP

Inventor： ARAKAWA NORIO ,  SAITOU CHIEZOU

IPC: G04F10/00 ,  G04G99/00 ,  G04G1/00

Abstract: PROBLEM TO BE SOLVED: To provide a method by which the actual operating time of a measuring instrument can be measured, by utilizing conventional hardware configuration even when no additional parts are used for integrating the operating time. SOLUTION: An actual operating time of a measuring instrument provided with a CPU 20 which performs operation and control, an RTC 30 which is backed up by means of a backup battery and outputs time data, a RAM 40 which is backed up by means of the backup battery, and a memory 50 which stores programs until the last time is integrated by storing the last turning-on time of a power source, the integrated actual operating time of the instrument until the last time but one, and the last turning-off time of the power source.

公开(公告)号：JPH07167712A

公开(公告)日：1995-07-04

申请号：JP20102594

申请日：1994-08-25

Applicant: ADVANTEST CORP

Inventor： ARAKAWA NORIO ,  YAMAGUCHI TAKAHIRO ,  WATANABE SHINICHI ,  NIKI NAOHARU

IPC: G01J3/28 ,  G01J3/45 ,  G01R23/16

Abstract: PURPOSE:To prevent a resolution at the side of a longer wavelength from being lowered even when a display is made by areas of wavelengths, by providing a setting means for setting an area of a required measuring wavelength by a lower limit wavelength and an upper limit wavelength, etc. CONSTITUTION:A setting means 21 sets an area of a required measuring wavelength in a prescribed wavelength area by a lower limit wavelength and an upper limit wavelength. A wavelength/frequency converting means 17A converts the lower and upper limit wavelengths to corresponding frequencies. A deciding means 17B decides whether or not a prescribed switching frequency is present in the set wavelength area. A plurality of data are taken while a multiplication of a multiplication converter circuit 15 is changed, and synthesized to display a spectrum of an approximately equal wavelength resolution. In other words, a signal from the same to-be-measured object is measured for a plurality of the number of times while the multiplication is changed, and the data are taken into a buffer memory 16 at every measuring time. A fast Fourier transformation circuit 18 transforms the data taken in the memory 16 at high velocity. The data written in a main memory 19 and synthesized, so that one display data are obtained.

公开(公告)号：JPH0585851B2

公开(公告)日：1993-12-09

申请号：JP14582786

申请日：1986-06-20

Applicant: ADVANTEST CORP

Inventor： ARAKAWA NORIO ,  YAMAGUCHI TAKAHIRO ,  NIKI NAOHARU ,  WATANABE SHINICHI

IPC: G01J9/02

公开(公告)号：JPH01106515A

公开(公告)日：1989-04-24

申请号：JP26329287

申请日：1987-10-19

Applicant: ADVANTEST CORP

Inventor： YAMAGUCHI TAKAHIRO ,  NAKANISHI TORU ,  ARAKAWA NORIO ,  TAKANAGA YOSHIO

IPC: H03H17/02 ,  H03D7/00 ,  H03F99/00 ,  H03H17/00

Abstract: PURPOSE:To improve S/N at high speed with low cost by processing digitally a signal at all stages after an AD converter and applying mean (integration) processing to each frame for a time area. CONSTITUTION:The start of readout of a real memory 24 and the production of each local signal from a cosine wave generator 31 and a sinusoidal wave generator 32 are synchronized. That is, the real memory 24 is read by an address generated by the address generator 39 and the address production of the address generator 33 is reset at each start of readout and the address generators 33, 39 are synchronized. Thus, the momentary phase of a cosine local signal and a sine local signal in the trigger signal position of the waveform read from the real memory 24 is always made constant. Thus, the momentary phase of a complex waveform of each frame stored in each memory plane of the complex number memory is made constant and the complex number waveforms are in the coherent relation. The complex waveform of each frame stored in the corresponding address of the complex number memory 38 is averaged by an average means 41 to improve the S/N.