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.

公开(公告)号：JPH07209351A

公开(公告)日：1995-08-11

申请号：JP1584694

申请日：1994-01-14

Applicant: ADVANTEST CORP

Inventor： TAKAOKU HIROAKI ,  ANNO NAOYA ,  FUKUI TAKAMASA

IPC: G01R23/173 ,  H03B5/18

Abstract: PURPOSE:To effect sweeping while forming a phase locked loop by sequentially setting a clock rate for each sweeping step frequency unit to a frequency divider in a DDS(Direct Digital Synthesizer) by means of a controller, thereby, eliminating the need of analog voltage in the sweeping. CONSTITUTION:The inner clock rate of a DDS 33 is set sequentially for each sweeping step frequency unit by means of a controller 32 and a variable sweeping frequency is outputted thus realizing a sweeping function. The variable frequency is fed to one input of a phase comparator 36 and the output from an YTO(YIG-tuned Oscillator) 38 is fed to a frequency divider 37 where the frequency is divided by N. It is then fed to the other input of the phase comparator 36 and an output signal therefrom is employed in oscillation frequency control of the YTO 38 thus locking the phase. Consequently, the oscillation frequency of the YTO 38 is outputted stepwise while being phase locked at all times.

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：JPH08201449A

公开(公告)日：1996-08-09

申请号：JP2744495

申请日：1995-01-24

Applicant: ADVANTEST CORP

Inventor： TAKAOKU HIROAKI ,  FUKUI TAKAMASA

IPC: G01R23/173 ,  H03L7/18

Abstract: PURPOSE: To suppress the effect of dynamic spurious by providing a random clock delay section and generating the step time before and after a unit step time randomly. CONSTITUTION: A random clock delay section 12 in a local oscillator 10 has a table memory 16 which receives a 8-bit address signal from an address counter 13 counting +1 in synchronism with a reference clock 31. Random value 12rnd of address is then read out and delivered to a frequency divider 18. The frequency divider 18 receives a frequency division value, i.e., the 12rnd , and divides it by a random unit step time Tsteprnd = 12rnd1 (clock 31)} and then delivers a random clock 12rndclk signal to a DDS section 40. It is also delivered to the counter 13 as a count enable signal. The step sweeping of the oscillator 10 is varied randomly by repeating the operation and the components of dynamic spurious frequency ΔF=1/Tstep is spread thus suppressing the effect of dynamic spurious.

公开(公告)号：JPH07229937A

公开(公告)日：1995-08-29

申请号：JP4039494

申请日：1994-02-15

Applicant: ADVANTEST CORP

Inventor： ANNO NAOYA ,  FUKUI TAKAMASA

IPC: G01R23/16 ,  G01R13/22 ,  G01R15/00 ,  G01R23/173

Abstract: PURPOSE:To improve operativity, in frequently operating key switches while looking at a screen, by eliminating the movement of line of sight and hands for key operation to the most. CONSTITUTION:A data knob 21 is provided with a pushbotton switch 12, and a switch status storing part 12b wherein the number of times the switch was pushed (switch signal 12a) is stored and the status whether the switch is pressed or not is determined and then switch status signal 12c is outputted is provided. A pulse conversion part 14 wherein, receiving the rotary pulse signal from a rotary encoder 24, the switch status signal 12c from the pushbotton, and the signal of a function mode register 13, conversion pulse signal 15 obtained by converting the rotary pulse signal by N-times is outputted, and function conversion signal 16 wherein the pushbotton switch 12 is assigned to an elements set switch function means is outputted, is provided, so that the frequency which the line of sight moves from the screen for elements setting operation is decreased.

公开(公告)号：JPH01319335A

公开(公告)日：1989-12-25

申请号：JP15310188

申请日：1988-06-20

Applicant: ADVANTEST CORP

Inventor： FUKUI TAKAMASA

IPC: G01D1/00 ,  G01R31/00 ,  H04B3/04

Abstract: PURPOSE:To shorten the measuring time by applying sweeping with high resolution on the way of sweep at the normal resolution so as to apply normal display and display with magnification at one measurement. CONSTITUTION:A sweep signal generator 11 is controlled by a controller 17, and a sweep signal is outputted normally by the normal resolution but in the case of sweeping a part desired for display with magnification, a sweep signal is generated with high resolution. When the sweep signal generator 11 sweeps with the normal resolution, the output of an A/D converter 14 is written at the speed of the normal resolution in a 1st memory 15. When the weep signal generator 11 is swept with high resolution, the output of the A/D converter 14 is written in a 2nd memory 16 at the speed of the high resolution and written in the 1st memory 15 at the speed of the normal resolution. That is, not all the data written in the 2nd memory 16 but skipped data are written in the 1st memory 15. Thus, the measuring time is shortened.

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：JPH04268820A

公开(公告)日：1992-09-24

申请号：JP2878891

申请日：1991-02-22

Applicant: ADVANTEST CORP

Inventor： FUKUI TAKAMASA ,  TAKAOKU HIROAKI

IPC: H03L7/087 ,  H03L7/22

Abstract: PURPOSE:To offer a phase locked loop in which a loop is never stabilized at frequency other than target frequency at the time of the start of operation. CONSTITUTION:In the phase locked loop in which the oscillation signal of a voltage controlled oscillator 1 is N-multiplied by a frequency multiplier 2, and this N-multiplied signal is phase-compared with a reference signal, and the voltage controlled oscillator 1 is controlled by this phase-comparison output, a second phase comparator 7 is provided, and in this second phase comparator 7, the oscillation signal of the voltage controlled oscillator 1 and the signal of the 1/N-fold frequency of the reference signal are phase-compared, and this phase comparison output is fed back to the voltage controlled oscillator 1 through an adder 8.