Trig-Tek™ DC200A Displacement Clipper User Manual
Contents
1. STRONICS TEST SYSTEMS Trig Tek DC200A Displacement Clipper User Manual Publication No 980981 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 questions 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 rechargeable batteri2. Start the power amplifier If the power amplifier will not start check the INTERLOCK indicator on the DC200A If the lamp is illuminated reset the MASTER GAIN control fully counterclockwise Adjust the Master GAIN control for the designed level system Astronics Test Systems Publication No 980981 Rev A DC200A User Manual IAN LO UH CE OI 241 20 fi Output Gain at 8 y 10 100 1000 Frequency Hz Figure 3 1 Filter 1 Equalizer Frequency Response dB 6 dB oct 100 1000 Hz 0 Figure 3 2 Filter 2 Equalizer Frequency Response Astronics Test Systems Operation 3 3 DC200A User Manual Publication No 980981 Rev A ABN E at 370Hz 6 50 gt o w 4 Output dB Frequency Hz Figure 3 3 Filter 3 Equalizer Frequency Response 50 40 Frequency Hz 30 Output dB 20 Figure 3 4 Filter 4 Equalizer Frequency Response Operation 3 4 Astronics Test Systems
3. SIG Signal ground Astronics TestSystems Installation 2 3 DC200A User Manual Publication No 980981 Rev A This page was left intentionally blank Installation 2 4 Astronics Test Systems Publication No 980981 Rev A DC200A User Manual Chapter 3 Operation The DC200A is pre calibrated at the factory Figure 2 2 shows the front panel Table 2 1 details the controls and indicators Figure 2 3 shows the rear panel and Table 2 2 details the operational connections that provide the front and rear panel description The DC200A circuitry is packaged on a single PC board CAUTION An internal 115 230 switch S3 located on the circuit board selects for application with 115 or 230V RMS power DO NOT APPLY 230 V RMS power with the 115 230 Switch in the 115V position as it could damage the unit When operating with 230 V RMS power the fuse should be changed to one with a 1 8 amp rating The DC200A has four equalization profiles as shown in Figures 3 1 through 3 4 In the DC200A the inputs and output of each equalizer can be selected by movable jumpers They are marked DC200 1 thru DC200 4 The equalizers are designed to accommodate the different air modulators NOTE The jumper locations are marked DC200 1 thru DC200 4 Remove the top cover and select the appropriate equalizer Jumpers are at the input and outputs of each equalizer EQUALIZER MODULATOR DC200 1 EPT 948 DC200 2 EPT 200 DC200 3 EPT 110 D
4. A This page was left intentionally blank iv Astronics Test Systems Publication No 980981 Rev A DC200A User Manual DOCUMENT CHANGE HISTORY Revision Date Description of Change A 06 14 2011 Document Control release Astronics Test Systems DC200A User Manual vi Publication No 980981 Rev A This page was left intentionally blank Astronics Test Systems Publication No 980981 Rev A DC200A User Manual Chapter 1 Introduction The DC200A Displacement Clipper Figure 1 1 is designed to prevent over modulation of an air modulator in an acoustic testing system The clipping ratio peak level rms input is established by adjustment of the front panel master gain control Four variations of air modulators are provided for in the DC200A for selection of the equalizer roll off characteristics The four variations of the DC200A Displacement Clipper are compatible with the following Ling Electronics Electropneumatic Transducers DC200A 1 is used with the EPT 94B 110 DC 200A 2 with the EPT200 DC 200A 3 with the EPT 110 and the DC 200 4 is used with the EPT 1094 Electropneumatic transducer The four modes of operation are selectable by moveable jumpers inside the unit The DC200A is installed in the signal processing system ahead of the power amplifier This provides the proper frequency band shaping and the master gain control for the acoustic testing system The unit will operat
5. C200 4 EPT 1094 Astronics Test Systems Operation 3 1 DC200A User Manual Operation Operation 3 2 Publication No 980981 Rev A Prior to use of the acoustic system the gain of the system amplifier must be adjusted to drive overall system gain corresponding to gain adjustments and indications on the DC200A Refer to Fig 2 2 and 2 3 and Tables 2 1 and 2 2 for a description of the functions and all operating control indicators To make these adjustments perform steps 1 thru 4 below 1 Set the Master Gain Control and Gain Level Set at the DC200A and the gain of the power amplifier to minimum Connect a sine wave oscillator to the input of the DC200A and set to a frequency of 200 Hz and a level of 200 millivolts RMS On the DC200A adjust the MASTR GAIN control for a clipping ratio of 1 41 on the front panel meter At this point the waveform will just start to clip If required use the CLIPPER SET LEVEL control to extend the range of the MASTER GAIN control Meter adjustment is factory set Adjust the power amplifier gain and if necessary the GAIN LEVEL SET front panel to derive full modulation fro the electro pneumatic transducer NOTE The positions of the DC200A OUTPUT GAIN and the Power amplifier gains are now set and should not be further adjusted Make certain all requirements of the previous section have been met and proceed as follows 1 2 Set the MASTER GAIN control fully counterclockwise
6. ator lamp that lights when power is applied to DC 200A Gain Level Set Potentiometer that adjusts the signal level from the equalizer circuit Clipper Level Set Potentiometer that determines the level at which the unit will clip Power ON OFF Switch applies Removes AC Power to from the unit Installation 2 2 Astronics Test Systems Publication No 980981 Rev A DC200A User Manual Figure 2 3 Rear Panel Table 2 2 DC 200A Operational Connections Rear Panel Connection Function INPUT BNC J1 1 Shell Signal ground BNC J1 2 Center Input Signal to DC 200 Clip Level Monitor Output Signal Test Points Sege Clipper Signal from clipper circuit Common Signal ground Isolated Output Pin 1 One side of output transformer secondary XLR Connector COM Pi Other side of output transformer secondary in2 SIG Pin 3 Signal ground Monitor Output Center Signal ground BNC Connector Se Shell Signal voltage side of primary winding of output transformer Clipper Output Center Clipper output BNC Connector Shell Signal ground AC PWR Input 117 or 230 V 50 60 Hz primary power TB1 NC Closed with TB 1 COM when master gain control is fully counterclockwise Interlock TB1 COM Interlock switch moving contact TB1 NO Closed with TB 1 COM when master gain control is not fully counterclockwise TB1 LED Interlock lamp DS2 ground circuit Ground TB1 CHAS Chassis ground TB1
7. e with sine or random wave signal inputs The purpose of the DC200A is to provide constant air modulator valve displacement over the rated frequency range and to prevent the mover modulation of the air modulator valve during either sine or random wave acoustic testing by clipping the input signal Figure 1 1 DC200A Displacement Clipper Astronics Test Systems Introduction 1 1 DC200A User Manual Publication No 980981 Rev A Features include e Four selectable Filters e Master gain control e SE or DIFF Input e Clipper monitor e Isolated output e 115 or 230 Volts RMS power Specifications Reference Data Input Impedance 100 000 Ohms Output Impedance monitor Less than 50 Ohms Isolated Output Impedance Less than 600 Ohms across the secondary of the output impedance transformer Pin 2 SIG and Pin 1 COM of the XLR connector Noise Level 65 dB below maximum output Maximum Output 14 Volts P P at 2 kHz Distortion Less than 1 10 Hz to 2 kHz Input Level 2 V RMS max Clipping Ratio Adjustable from 9 to 1 Power Requirements 105 125 Volts or 210 230 Volts RMS at 50 60 Hz 6 W Dimensions 3 5 high x 19 wide x 7 5 deep Introduction 1 2 Asironics Test Systems Publication No 980981 Rev A DC200A User Manual Chapter 2 Installation Installation As soon as the unit is received unpack and inspect it for shipping damage loose knobs and components or
8. es 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 atshelpdesk astronics 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 atshelpdesk 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 solicit quotation
9. other defects All components of the DC 200A are contained in one rack mounting chassis Proper connections for the unit are listed in Table 2 2 Figure 2 1 is a dimensional drawing for use during installation Mount the unit housing case into a 19 inch relay rack using the special binder head screws 10 32 x 1 2 provided Install the chassis into the unit housing Make the operational connections described in Table 2 2 Provide adequate equipment ventilation With the DC 200A connected in the acoustic testing system determine the ground circuit strapping required as follows If the DC 200A is in a system where a common return must be made at the DC 200A Jumper TB1 CHAS and TB1 SIG together to connect the chassis to signal ground 16 50 de RR T Top View 7 00 Front View CG 3 50 Figure 2 1 DC200A Dimensional Drawing Astronics TestSystems Installation 2 1 DC200A User Manual Publication No 980981 Rev A Figure 2 2 Front Panel Table 2 1 DC 200A Controls and Indicators Front Panel Panel Marking Description and Function Master Gain Potentiometer that controls the signal level through the DC 200A Clipping Ratio Meter Meter that indicates the ratio of the clipped Meter Adjustment Factory Set output peak voltage to the unclipped input rms voltage Interlock Indicator lamp that lights when the MASTER GAIN control is not fully counterclockwise Power LED Indic
10. s 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 life 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 officers emplo
11. ument 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 980981 Rev A DC200A User Manual Table of Contents Chapter E 1 1 tee Te ata ida 1 1 Eeer ee EE E 1 2 Reference Data ui tata 1 2 Power equi Me Si tant ec atten nd ate aie 1 2 DIMENSION EE 1 2 Chapter 2 2 ae A ee 2 1 InStallatl n zes ee ee E 2 1 Installation EE 2 1 Ghapler E 3 1 Opera tc 3 1 n EE 3 2 Astronics Test Systems DC200A User Manual Publication No 980981 Rev A List of Figures Figure 1 1 DC200A Displacement Clpper nnt 1 1 Figure 2 1 DC200A Dimensional Drawing manner nn 2 1 Fig re 2 2 Front EE 2 2 Free Rear et E E A A A i 2 3 Figure 3 1 Filter 1 Equalizer Frequency Response ccccococcccconoccccnononcccnanoncncnanoncncnnnonnnc nana nen ann nnn nn 3 3 Figure 3 2 Filter 2 Equalizer Frequency Response ann nnn ann 3 3 Figure 3 3 Filter 3 Equalizer Frequency Response nn 3 4 Figure 3 4 Filter 4 Equalizer Frequency Response nn nnn ann 3 4 ii Astronics Test Systems Publication No 980981 Rev A DC200A User Manual List of Tables Table 2 1 DC 200A Controls and Indicators Front Panel Table 2 2 DC 200A Operational Connections Rear Panel onocccincccnnccononicnnocnnancccnonnnonona canon nnancncnna 2 3 Astronics Test Systems DC200A User Manual Publication No 980981 Rev
12. yees 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 h 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 i 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 the instr
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