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ShibaSoku AM70A Instruction Manual

2 ch audio analyzer
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91200090411-3
AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL

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  • Page 1 91200090411-3 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL...
  • Page 3 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 Contents Contents AM70A 2CH AUDIO ANALYZER INSTRUCTION MANUAL ....... 1 CONTENTS ......................1 FIGURES ......................1 TABLES ......................1 GENERAL ....................1-1 FEATURES ....................2-1 SPECIFICATION ..................3-1 3.1. OSCILLATOR SECTION ................3-1 Output Impedance .................
  • Page 4 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 UNIT ....................4-2 4.1.5. RESPONSE .................. 4-2 4.1.6. FREQUENCY ................4-3 4.1.7. FILTERS ..................4-3 4.1.8. OUTPUT ..................4-3 4.1.9. 4.1.10. OSCILLATOR ................4-4 4.1.11. LIMIT ..................... 4-4 4.1.12. DATA SET ..................4-4 4.1.13.
  • Page 5 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 Internal Connection of EXT I/O ............ 5-22 5.2.2. Setup of memory function and operation of external switches ..5-23 5.2.3. MAINTENANCE AND CALIBRATION ............6-1 6.1. INTRODUCTION ..................6-1 6.2. TROUBLESHOOTING ................6-1 6.3.
  • Page 7 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 Figures Figures FIG. 4-1 ......................4-1 FIG. 4-2 ......................4-6...
  • Page 9 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 Tables Tables TABLE 3-1 S/N MEASUREMENT ························································· 3-3 TABLE 3-2 ALL DISTORTION FACTOR ················································· 3-4 TABLE 3-3 HARMONIC DISTORTION FACTOR (ANALYSIS) ···················· 3-4 TABLE 4-1 ······················································································· 4-2 TABLE 4-2 ······················································································· 4-3...
  • Page 11 The AM70A can measure two channels (Each channel is measured and the result is displayed independently). It assures simultaneous level measurement at high speed, making it ideal for audio-equipment manufacturing lines.
  • Page 13 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 FEATURES · Measurement is processed in a short time thanks to DSP computation. · High-speed measurement is possible. (Level measuring time is less than 100 ms) Conditions: 1. Frequency of measuring signal is over 1 kHz 2.
  • Page 15 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 SPECIFICATION 3.1. Oscillator Section 3.1.1. Output Impedance 600  terminator ON/OFF. Independently set for A · Balance/unbalance: and B channels. 3.1.2. Sine Wave Output · Frequency range: 10.00 Hz to 100.0 kHz. Final digit is 0 or 5.
  • Page 16 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 3.2.2. Measuring Filters · 400 Hz HPF, 18 dB/OCT, with tertiary Butterworth response · 30 kHz LPF, 18 dB/OCT, with tertiary Butterworth response · 80 kHz LPF, 18 dB/OCT, with tertiary Butterworth response ·...
  • Page 17 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 3.2.6. S/N Measurement · Frequency range: 10 Hz to 100 kHz S component level: −100 dB to +40 dB · Measuring range: (10.0 V to 100 V) N component level: −100 dB to +40 dB (10.0 V to 100 V)
  • Page 18 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 · Harmonic analysis (ANALYSIS) THD: Harmonic distortion factor is measured from the 2nd to the 10th. (This measurement is applied to 50 kHz or less. In case of other frequency range, the range is from the 2nd to the 5th.)
  • Page 19 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 3.3. Memory Function The memory, which can store 100 ways of panel setting, is incorporated. The last memory function that can memorized the panel setting immediately before the power switch is turned OFF.
  • Page 21 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 OPERATION 4.1. Controls on The Front Panel 4.1.6. "RESPONSE". 4.1.7 "FREQUENCY". 4.1.20. "FREQUENCY indicator". 4.1.13. "Judge display". 4.1.3. "OSCILLATOR 4.1.19. "B-ch DATA/RATIO indicator". indicator". 4.1.5 "UNIT". 4.1.16. "MEMORY/ 4.1.18. "A-ch DATA/RETIO ADDRESS. indicator".
  • Page 22 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 · Push the EF CHANNEL switch for turning ON/OFF (LED lights up and goes out) to determine to use the reference for level difference and phase difference of which channel. · Push the IMD switch for turning ON (LED lights) to perform intermodulation distortion measurement.
  • Page 23 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 [NOTE] These switches are effective on during level measurement. 4.1.7. FREQUENCY These are switches to select the frequency. · Push the CHANNEL switch for turning ON (LED lights) to measure the frequency of A channel. When it turns OFF (LED goes out), frequency of B channel is measured.
  • Page 24 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 4.1.10. OSCILLATOR Use these switches for setting the oscillation frequency. · Push the FREQUENCY switch for turning ON (LED lights), and frequency can be set using the DATA SET ten keys. · Push the AMPLITUDE switch for turning ON (LED lights, and the A (ON) and B (OFF) switches blink, enabling to set the output level using he DATA SET ten keys.
  • Page 25 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 · When controlling the number for panel setting from the EXT I/O, available numbers are from 00 to 99. These numbers can be separated in several periods, in each of which number can be set. This period setting is registered by depressing the STORE switch for two seconds.
  • Page 26 AC power cable from the AC line inlet on the rear panel to increase safety. 4.2.5. GP-IB When controlling the AM70A audio analyzer from the external controller such as a personal computer, connect this BP-IB connector with the GP-IB board of a personal computer. 4.2.6.
  • Page 27 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 4.2.7. OPTION Slots on which option filters are mounted. Filters can be mounted by customers. The AM70A can accommodate two option filters. Concerning the positions of additional filters, refer to the block diagram.
  • Page 29 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 GB-IB EXTI/O 5.1. GP-IB The AM70A audio analyzer is equipped with the GP-IB interface as a standard equipment, enabling to remotely control various functions. 5.1.1. GP-IB Interface Functions The AM70A has the following interface functions.
  • Page 30 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 (3) Talker Display Contents Necessary sub set Talk Basic Serial Only Unaddress Talker Poll Mode If MLA Not required. SH1 and AH1 SH1 and AH1 SH1 and AH1 SH1 and AH1 SH1 and L1 to L4...
  • Page 31 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 (7) Parallel poll Display Contents Necessary sub set No function Not required. Remote configuration L1 to L4 Local configuration Not required. (8) Device clear Display Contents Necessary sub set No function Not required.
  • Page 32 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 (10) Controller Display Contents Necessary sub set − − − − − − − − − − − − − − − − − − − − − − − − − −...
  • Page 33 "GP-IB” 5.1.3. Input format of control commands When controlling the AM70A using the listener function of GP-IB interface function, transmit control commands from the host computer in accordance with directions shown below. Characters must be input in the ASCII code.
  • Page 34 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 Reference channel for level-difference and phase-difference measurements Select the channel used as the reference when performing level-difference and phase-difference measurements. Header Data Contents Reference channel: A channel Reference channel: B channel Input to the measuring unit Select balance/unbalance, impedance and others for the input.
  • Page 35 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 Filters Set up filters. Header Data Contents 400 Hz HPF OUT 400 Hz HPF IN All LPF IN 30 kHz LPF IN 80 kHz LPF IN 20 kHz LPF IN JIS-A filter OUT...
  • Page 36 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 Frequency counter Perform setup for frequency counter. Header Data Contents Frequency counter input: A channel Frequency counter input: B channel Frequency counter and BEF filter: Automatically selected. Frequency counter and BEF filter: Fixed.
  • Page 37 Contents Floating status is established. Chassis is grounded. (14) Commands for GP-IB controlling For setting the service request when the Am70A is controlled via GP-IB. Header Data Contents SRQ is not generated. SRQ is generated when the measured data is settled.
  • Page 38 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 (16) Judging reference values for relative level measurement Set the reference values to judge the measured results obtained in relative level measurement. Header Data Contents 0.01 to 100000 Upper limit value: dB 0.01...
  • Page 39 SRQ of the control bus line to “TRUE (LOW)”. SRQ of the control bus line is cleared by reading the status byte of the AM70A by serial polling. 5-11...
  • Page 40 Method to use status byte and SR commands are explained below. Status byte Upon the reception of serial poll from the host computer, each bit of the status byte, which is output from the AM70A, is allotted as shown in the table below. Data...
  • Page 41 Sample Programs Sample programs (1) to (3) for the N88 BASIC are introduced on the next and succeeding pages. (1) describes the setup of the AM70A and readout example of measured results. (2) is a readout example of measured results using a service request.
  • Page 42 1090 ’///////////////////////////////////////////////////////////////// /////////////// 1100 ’ Initial setup 1110 ’///////////////////////////////////////////////////////////////// /////////////// 1120 ’ AM70A.ADR=7 For setting the device address of ’AM70A. 1130 ’ CPU.ADR=0 For setting the device address of ’PC9801. 1140 ’ 1150 ’///////////////////////////////////////////////////////////////// /////////////// 1160 ’The PC9801 is set in the GP-IB mode.
  • Page 43 1340 ’ PRINT@ AM70A.ADR;”FRC1” ’ Frequency counter input = A ch 1350 ’ PRINT@ AM70A.ADR;”FR1000HZ” ’ Oscillation frequency = 1000 Hz 1360 ’ PRINT@ AM70A.ADR;”AA1.000V” ’ Output level channel A = 1,000V 1370 ’ PRINT@ AM70A.ADR;”BA-10.00DB” ’ Output level channel –10.00dB...
  • Page 44 1090 ’///////////////////////////////////////////////////////////////// /////////////// 1100 ’ Initial setup 1110 ’///////////////////////////////////////////////////////////////// /////////////// 1120 ’ AM70A.ADR=7 For setting the device address of ’AM70A. 1130 ’ CPU.ADR=0 For setting the device address of ’PC9801. 1140 ’ 1150 ’///////////////////////////////////////////////////////////////// /////////////// 1160 ’ The PC9801 is set in the GP-IB mode.
  • Page 45 ’ Filter = 30 kHz LPF IN 1340 ’ PRINT@ AM70A.ADR;”FRC1” ’ Frequency counter input = Ach 1350 ’ PRINT@ AM70A.ADR;”FR1000HZ” ’ Oscillation frequency = 1000 Hz 1360 ’ PRINT@ AM70A.ADR;”AA1.000V” ’ Output level channel A = 1,000V 1370 ’ PRINT@ AM70A.ADR;”BA-10.00DB” ’ Output level channel –10.00dB...
  • Page 46 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 1710 INPUT@AM70A.ADR;FR$,A1$,A3$,B1$,B2$,B3$ 1720 ’ 1730 ’((((((( Display of measured data )))))))))))))))))))))))))))) 1740 IF A3$=“1”THEN A3$=“V”:GOTO*UNIT 1750 IF A3$=“2”THEN A3$=“%”:GOTO*UNIT 1760 IF A3$=“3”THEN A3$=“dB”:GOTO*UNIT 1770 IF A3$=“4”THEN A3$=“dBm”:GOTO*UNIT 1780 IF A3$=“5”THEN A3$=“°”:GOTO*UNIT 1790 ’...
  • Page 47 1110 ’///////////////////////////////////////////////////////////////// /////////////// 1120 ’ SP=0 ’ Flag for checking SRQ is cleared. 1130 ’ 1140 AM70A.ADR=7 ’ Device address of AM70a is set. 1150 CPU.ADR=0 ’ Device address of PC9801 is set. 1160 ’ 1170 ’///////////////////////////////////////////////////////////////// /////////////// 1180 ’...
  • Page 48 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 1430 ’ 1440 PRINT@ AM70A.ADR;CM$ ’ Command is sent. 1450 ’ 1460 FOR 1=0 TO 100:NEXT1 ’ Wait time to confirm SRQ 1470 ’ 1480 GOTO *INPUT.COMMAND 1490 ’ 1500 ’///////////////////////////////////////////////////////////////// /////////////// 1510...
  • Page 49 91200090411-3 5.2. Operating Method of EXT I/O The AM70A is equipped with the function to memorize the settings of measuring conditions and judgment reference values. Set several measuring processes sequentially in the memory using this function, then perform measurement by selecting the memory numbers. This enables you to efficiently complete a series of measurements.
  • Page 50 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 5.2.1. Connection of EXT I/O EXT I/OF connector terminals are as follows. Signal name Signal name Internal power supply + 5V output +5V input Remote ON input Power input for EXT I/O Ach UNDER output...
  • Page 51 No. 8 and 14 pins: GND Common of switch and transistor’s emitter The internal circuit of the AM70A is as shown in the circuitry above. Normal LED requiring a lighting current of approx. 20 mA for displaying the judged result can be p:l owered by the internal power supply.
  • Page 52 AM70A 2ch AUDIO ANALYZER INSTRUCTION MANUAL 91200090411-3 For instance, assume to perform measurement by setting five kinds of measuring items/judging reference values to memory numbers 1 to 5. To set a measuring period, display the memory No. 1 and depress the STORE switch for two seconds to light up the decimal point, then press the UP arrow switch to set the memory number to 5, and perform the same operation.
  • Page 53 AC line voltage. d) Mount the fuse and fuse cap in the reverse order of item b). e) Connect the AC power cable of the AM70A, turn ON the power switch, and confirm that it operates normally.
  • Page 54 6.4.2. Confirmation of Measuring Section · Connect the oscillator output of the AM70A to the measuring section, measure the level, and confirm that the measured value is correct. · Connect the oscillator output of the AM70A to the measuring section, measure the distortion factor, and confirm that distortion factor is within the rated value.
  • Page 55 The contents of this document may be modified without notice in advance. The copyright of this document belongs to ShibaSoku Co., Ltd., and using any part of it in another document, or copying or translating any part of it without permission from ShibaSoku Co., Ltd.