Trig-Tek™ 402PSI Microphone Calibrator User Manual
Contents
1. STRONICS TEST SYSTEMS Trig Tek M 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A Astronics Test Systems Inc 4 Goodyear Irvine CA 92618 Tel 800 722 2528 949 859 8999 Fax 949 859 7139 atsinfo astronics com atssales astronics com atshelpdesk astronics com http www astronicstestsystems com Copyright 2011 by Astronics Test Systems Inc Printed in the United States of America All rights reserved This book or parts thereof may not be reproduced in any form without written permission of the publisher THANK YOU FOR PURCHASING THIS ASTRONICS TEST SYSTEMS PRODUCT For this product or any other Astronics Test Systems product that incorporates software drivers you may access our web site to verify and or download the latest driver versions The web address for driver downloads is http www astronicstestsystems com support downloads If you have any guestions about software driver downloads or our privacy policy please contact us at atsinfo astronics com WARRANTY STATEMENT All Astronics Test Systems products are designed to exacting standards and manufactured in full compliance to our AS9100 Quality Management System processes This warranty does not apply to defects resulting from any modification s of any product or part without Astronics Test Systems express written consent or misuse of any product or part The warranty also does not apply to fuses software non rechargea2. Galibration za aksel t aine sl assessor utdratt 4 2 Initial SWiteh Settings sce ceil aia ale ata nia ean ies 4 2 Galibration Procedure su s mmmmuusa so sute tia Stl el PENE ctl cue ciudad elu TEE leerla 4 2 Asironics Test Systems 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A List of Figures Figure 1 1 402 PSI Microphone Calibrator osououssusssa n aa aan a a naa enaa Kaan aa ana annan 1 1 Figure 2 1 402PSI Microphone Calibrator Front Panel cuoossusssssss e naa nana naa ana a nannaa 2 2 Figure 4 1 402PSI Frequencies csuuossmmsem aa aa n aa a aan aa naa Kaa aan Kanaa naa annan aaaaeaen 4 1 ii Astronics Test Systems Publication No 980962 Rev A 402PSI Microphone Calibrator User Manual DOCUMENT CHANGE HISTORY Revision Date Description of Change A 09 01 2011 Document Control release Astronics Test Systems 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A This page was left intentionally blank iv Astronics Test Systems Publication No 980962 Rev A 402PSI Microphone Calibrator User Manual Chapter 1 Introduction Description The 402PSI Microphone Calibrator Figure 1 is designed to provide calibration of high intensity microphones and pressure transducer The 402PSI is housed in a portable carrying case 12 x12 x7 5 Figure 1 1 402 PSI Microphone Calibrator The 402PSI Microphone Cali
3. True RMS Detector In order to get an accurate comparison it is necessary to measure the UNKNOWN microphone with a Astronics Test Systems Operation 2 3 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A charge amplifier that also has True RMS Detection The 402PSI has a built in provision to compare either charge or MV Integrated Circuit type microphones against the KNOWN microphone KNOWN Microphone Operation 2 4 The Reference KNOWN microphone used in the 402PSI is a MIC62 OEM from Dytran Instruments For sensitivity refer to Chapter 4 Figure 4 1 402 PSI Freguencies The traceable accuracy variance of this microphone is 5 from 20 to 1500 Hz at 0 1 to 1 0 PSI The calibration is RMS millivolts per PSI peak NOTE The sensitivity at the Reference KNOWN microphone must be known in order to accurately run the Performance Test Calibration Procedure or Operational Tests to find UNKNOWN sensitivities of other sensors The recommended calibration period on the MIC62 is one year Astronics Test Systems Publication No 980962 Rev A 402PSI Microphone Calibrator User Manual Chapter 3 Performance Test The Performance Test Procedure should be run to verify that the unit is performing within the manufactured specifications The unit uses integrated circuits and very stable parts and should not require calibration more than once every year unless a part fails In the event that a reading is out of toleranc
4. ards The final calibration results are dependent on the accuracy of this Reference Microphone The variance is measured to be less than 5 of the Sensitivity PSI Test Equipment Note Equivalent test equipment can be substituted TRMS Meter Keithley 179A Digital Counter Leader LDC 822 Maximum PSI 4 Maximum PSI 0 O O W S O N NN S OD Ny ISS TI HP YS OHS Om OP Ow P OSOS PF FHF PGF FP PF POOH T Frequency in Hz Figure 4 1 402PSI Frequencies Asironics Test Systems Calibration Procedure 4 1 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A KNOWN Calibration With the power OFF and the REFERENCE Microphone in place insert the calibration plug or the UNKNOWN Microphone in the manifold The UNKNOWN port must be closed Initial Switch Settings Prior to turning the 402PSI power ON set the switches to the following Oscillator ON OFF switch to OFF INT EXT to INT KNOWN DRIVE LEVEL to 1 0 PSI OP CAL to CAL METER Unknown Known to KNOWN Freguency Hz to 0500 PERCENT PSI to PSI Unknown PC mV mV Curr to MV XI XI0 and Sensitivity should be set for the mV PSI sensitivity of the KNOWN Reference microphone Calibration Procedure Note Be sure the Oscillator ON OFF switch is in the OFF position before the instrument is turned on 1 2 3 4 Set the KNOWN CAL ADJ for one PSI on the AC TRMS Voltmeter for the Connect the AC voltmeter to the KNOWN MIC Output Place th
5. ble batteries damage from battery leakage or problems arising from normal wear such as mechanical relay life or failure to follow instructions This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular use The remedies provided herein are buyer s sole and exclusive remedies For the specific terms of your standard warranty contact Customer Support Please have the following information available to facilitate service 1 Product serial number 2 Product model number 3 Your company and contact information You may contact Customer Support by E Mail atshelpdeskOastronics com Telephone 1 800 722 3262 USA Fax 1 949 859 7139 USA RETURN OF PRODUCT Authorization is required from Astronics Test Systems before you send us your product or sub assembly for service or calibration Call or contact Customer Support at 1 800 722 3262 or 1 949 859 8999 or via fax at 1 949 859 7139 We can also be reached at atshelodesk astronics com If the original packing material is unavailable ship the product or sub assembly in an ESD shielding bag and use appropriate packing materials to surround and protect the product PROPRIETARY NOTICE This document and the technical data herein disclosed are proprietary to Astronics Test Systems and shall not without express written permission of Astronics Test Systems be used in whole or in part to solic
6. brator is capable of delivering sound pressure levels from 0 1 to 1 0 PSI in 0 1 PSI increments and is accurate to 15 The test manifold which interfaces both the UNKNOWN and REFERENCE Known microphones to the sound transducer is designed so that both microphones share a common cavity The output of the reference or KNOWN microphone is used in a closed loop control to maintain an accurate sound pressure level in the test manifold Freguencies are crystal controlled from 20 to 1500 Hz in 1 Hz steps Astronics Test Systems Introduction 1 1 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A The 402PSI is completely self contained and comes with the sound transducer reference pressure transducer test manifold microphone adapter of your choice calibration plug and power cord Dimensions Case 12 x 12 wide x 7 5 high Sound Transducer 4 5 dia x 5 5 high Weight 40 Ibs with sound transducer Theory of Operation The 402PSI has synthesized freguencies from 20 to 1500 Hz in 1 Hz steps This freguency signal is sent to an AGC Automatic Gain Control circuit that controls the signal level of the transducer driver See Chapter 4 Figure 4 1 402PSI Freguencies The Reference microphone senses the sound pressure level in the test manifold at the output of the transducer The output of the reference microphone is amplified and then rectified by the true RMS AC to DC converter and com
7. e POWER Switch to ON Place the Oscillator ON OFF switch to ON KNOWN reference microphone 5 TRMS value sensitivity x 707 Note Adjustments are made through the hole after removing the screw 5 SE ee Set the DC ADJ for an indication of 1 000 005 PSI on the panel meter Connect the AC Voltmeter to the UNKNOWN MIC Output Observe the same level as seen on the KNOWN MIC Output Place the UNKNOWN KNOWN Meter switch to UNKNOWN Set the UNKNOWN CAL ADJ for an indication of 1000 005 PSI on the Panel Meter 10 Place the METER PERCENT PSI switch to PERCENT and observe an Calibration Procedure 4 2 Astronics Test Systems Publication No 980962 Rev A 402PSI Microphone Calibrator User Manual indication of less than 3 0 percent on the panel meter 11 Place the OSCILLATOR ON OFF switch to OFF Astronics Test Systems Calibration Procedure 4 3 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A This page was left intentionally blank Calibration Procedure 4 4 Astronics Test Systems
8. e the unit may reguire calibration see Chapter 4 Initial Switch Settings Prior to turning the 402PSI power ON set the switches to the following Oscillator ON OFF switch to OFF INT EXT to INT KNOWN Freguency Hz to 0500 DRIVE LEVEL to 1 0 PSI OP CAL to CAL METER Unknown Known to KNOWN PERCENT PSI to PSI Unknown PC mV mV CURR to mV XI X10 and Sensitivity should be set for the mV PSI sensitivity of the KNOWN Reference microphone Performance Test Procedure Note Be sure the Oscillator ON OFF switch is in the OFF position before the instrument is turned on HN amp E 0 58 ee Connect the AC Voltmeter to the KNOWN MIC output Place the POWER Switch to ON Place the OSCILLATOR ON OFF switch to ON Observe an indication of 1 000 03 PSI on the panel METER Place the Meter UNKNOWN KNOWN Switch to UNKNOWN Observe an indication of 1 000 03 PSI on the panel METER Place the METER PERCENT PSI Switch to PERCENT and observe an Astronics test Systems Performance Test 3 1 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A indication of less than 3 0 on the panel METER 8 Place the OSCILLATOR ON OFF switch to OFF Performance Test 3 2 Astronics Test Systems Publication No 980962 Rev A 402PSI Microphone Calibrator User Manual Chapter 4 Calibration Procedure The calibration of the 402PSI is based on the traceability of the Reference Microphone The MIC62 is traceable to secondary stand
9. ficers employees subsidiaries affiliates and distributors harmless against all claims arising out of a claim for personal injury or death associated with such unintended use FOR YOUR SAFETY Before undertaking any troubleshooting maintenance or exploratory procedure read carefully the WARNINGS and CAUTION notices RISK OF ELECTRICAL SHOCK human life and safety and is capable of DO NOT OPEN inflicting personal injury A CAUTION This equipment contains voltage hazardous to If this instrument is to be powered from the AC line mains through an autotransformer ensure the common connector is connected to the neutral earth pole of the power supply Before operating the unit ensure the conductor green wire is connected to the ground earth conductor of the power outlet Do not use a two conductor extension cord or a three prong two prong adapter This will defeat the protective feature of the third conductor in the power cord O Maintenance and calibration procedures sometimes call for operation of the unit with power applied and protective covers removed Read the procedures and heed warnings to avoid live circuit points SENSITIVE ELECTRONIC DEVICES Do Before operating this instrument 1 Ensure the proper fuse is in place for the power source to operate 2 Ensure all other devices connected to or in proximity to this instrument are properly grounded or connected to the protective third wire earth ground If
10. it quotations from a competitive source or used for manufacture by anyone other than Astronics Test Systems The information herein has been developed at private expense and may only be used for operation and maintenance reference purposes or for purposes of engineering evaluation and incorporation into technical specifications and other documents which specify procurement of products from Astronics Test Systems TRADEMARKS AND SERVICE MARKS All trademarks and service marks used in this document are the property of their respective owners e Racal Instruments Talon Instruments Trig Tek ActivATE Adapt A Switch N GEN and PAWS are trademarks of Astronics Test Systems in the United States DISCLAIMER Buyer acknowledges and agrees that it is responsible for the operation of the goods purchased and should ensure that they are used properly and in accordance with this document and any other instructions provided by Seller Astronics Test Systems products are not specifically designed manufactured or intended to be used as parts assemblies or components in planning construction maintenance or operation of a nuclear facility or in lite support or safety critical applications in which the failure of the Astronics Test Systems product could create a situation where personal injury or death could occur Should Buyer purchase Astronics Test Systems product for such unintended application Buyer shall indemnify and hold Astronics Test Systems its of
11. one Calibrator User Manual Controls This four position thumb switch allows selection of 20 to 1500 Hz in 1 Hz step Freguency Selector The freguency response of the transducer is given in the usable freguency range chart Ten position rotary switch with selection of Level Selector 0 1 to 1 0 PSI in 0 1 PSI increments Energizes the circuitry when in the ON ON OFF Power Switch position Shuts off the drive oscillator to the Pressure transducer ON OFF Switch Note This switch should be in the OFF position before turning the POWER switch ON Allows accommodating UNKNOWN Sensitivity Selector Switch microphones with sensitivities from 100 to 1100 mV pC PSI Works in conjunction with the SENSITIVITY Selector to extend the range to 1000 11000 XI XIO Switch mV pC PSI NOTE There is no STOP on the MSD and 1 or 0 are the only valid positions When at PC accommodates charge mode Mu microphone mV is a voltage input and the RO ME CURR Suiten MV CURR position accommodates MV Integrated Circuit type microphones i Selects which input microphone is being UNKNOWN KNOWN Switch monitored PERCENT PSI Switch Units for the meter Indicators DIGITAL PANEL Meter 3 1 2 Digit meter to monitor the Sound Pressure Level in PSI units or percent different between the two microphones Test Method The REFERENCE microphone in this instrument called the KNOWN microphone is measured using a
12. pared to a reference voltage Any error from the comparison causes the compressor via the AGC circuit to increase or decrease the input to the drive circuit until the DC from the converter matches the reference thus maintaining a known fixed sound pressure level in the test manifold Because of the nature of the driver transducer the output can have up to 5 distortion By using a true root means sguare conversion at the AC to DC converter the distortion can only alter the level by the square root of the sum of the components squared for instance if the signal component is 1 and the distortion component is 10 or 0 1 the level change will be 05 change so the distortion has a very small effect on the control level Vp 0 1 1 004987 Because the 10 dB step will be controlled by gain changes the sound pressure level for each 0 1 PSI step will be as accurate as the gain set for each step which can be held 1 so the accuracy of the sound pressure level generated at the reference microphone is established by a preset reference voltage and the gain of the microphone amplifier Both the reference voltage and the gain can be controlled very accurately So the calibration accuracy of the system will ultimately be the precision of the KNOWN reference microphone Introduction 1 2 Astronics Test Systems Publication No 980962 Rev A 402PSI Microphone Calibrator User Manual Chapter 2 Operation General Information For proper ope
13. ration it is necessary that the microphone to be tested is installed in the test manifold with the appropriate microphone adapter If there are any questions regarding proper microphone adapters contact the manufacturer The 402PSI is equipped with a manifold which interfaces the KNOWN and UNKNOWN microphones to the sound transducer In this manifold the two microphones share a common cavity The KNOWN microphone fits securely in the manifold with a metal hold down nut The UNKNOWN microphone must be installed using an adapter made especially for the microphone being tested For best results an air tight seal is desired between the microphone to be tested and its adapter These adapters can be purchased from Astronics Test Systems Custom adapters can be supplied on reguest The exact dimensions for the new microphone are reguired if a special adapter is ordered Front Panel Controls and Indicators Figure 2 1 shows the controls and indicators on the front panel of the 402PSI Astronics Test Systems Operation 2 1 402PSI Microphone Calibrator User Manual Publication No 980962 Rev A AC POWER 90 240 VOLTS RMS MODEL 402PSI MICROPHONE CALIBRATOR E TT i am UNKNOWN SENSITIVITY KNOWN MIC INPUT DRIVE LEVEL 0 5 0 6 OSCILLATOR FREQUENCY Hz 100 1100 mv pc PSI DC 20 1500 Figure 2 1 402PSI Microphone Calibrator Front Panel Astronics Test Systems Operation 2 2 Publication No 980962 Rev A 402PSI Microph
14. the instrument fails to operate satisfactorily shows visible damage has been stored under unfavorable conditions has sustained stress Do not operate until performance is checked by qualified personnel Publication No 980962 Rev A 402PSI Microphone Calibrator User Manual Table of Contents Chapter NN giiia aiaia 1 1 Introduction t it DONA mimi 1 1 DESCIIPtON n Ta Ko n da 1 1 DIMENSIONS tr tica Aaa vsta 12 Weight ii s tt isk m t ymyyti 1 2 Theory of Operationi i a s sisinesstiv a stalkam iei taa dene 1 2 Chapt r 2 an a areata a Aaa daaa aE aaa aaar s aaa Sanaan aa naaar aah EATA Aeara eaaa naaa Dia Laali 2 1 Opera 2 1 Generali Information s i ss TA AA A GE 2 1 Front Panel Controls and INdicators ccccccccononnccnnnnnonononananannnano nono nannnnnnnn nono nana nnnnnnnnnnnnnnananannns 2 1 Gontrols A en ii 2 3 IMICIGALONS 20 A bs 2 3 Test Method a A dd 2 3 KNOWN MicrophoN6 ica lia 2 4 GAP Suave 3 1 Performance TeSt nrnnnnnnnnnunnnnunnnnuunnnnnnnnnunnnnnnnnnnunnnnnnnnnnnnnnnnnnnunnnnnnennnnnnnnnnnnnnnnnnnunennnnennnnen 3 1 Initial Switch SEtINOS cir td TP idet 3 1 Performance Test Procedure aranunrrunnnnnnnnnnnvvnnnnenrrnnnnennnnnenevnnnnenrrunanenvnnnanevnnnnenerunanenvvnnnnennnnnener une 3 1 Chapter A A PA cesses cazaes cazeaeszecs cd awceszec cazecs cotuensnncsxaucs sceceereachensscouesseneeed 4 1 Calibration Procedur vicario NG 4 1 Test EJUIPMON tina n a ai ia A et eee 4 1 KNOWN
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