SRC20 Manual - The Modal Shop, Inc.
Contents
1. Accessories and Optional Equipment 6 19 98 The SRC20 is delivered with the following standard accessories e SRC20 instrument Alkaline battery 9 volt e SRC20 User manual e PSA005 AC power adapter US only 115 volts AC to 9 volts DC Has 5 pin Switchcraft connector to plug in directly to the SRC20 e CCS009 Cordura nylon pouch The following optional equipment is also available Introduction 1 7 e CBL101 Cable to power the SRC20 Switchcraft 5 pin connector and a 9 pin connector to connect to RS 232 port of most computers e CBL063 RS 232 9 pin connector and power cable e PSAO001 115 Vac to 9 Vdc 50 60 Hz used in con junction with CBLO 63 e CBL038 Connects SRC20 to an external battery and RS232 port of most computers e CBL034 Connects SRC20 to un wired cable end 4 conductor shielded CBL035 Connects SRC20 to customer supplied external battery or power supply with alligator connectors on one end e PSA002 AC DC power adapter 220 Vac to 9Vdc 50 60 Hz Connecting Internal or External Power Alternatively you may use an exter nal power source via pin 1 GND and pin 4 of the 5 pin connector To do this order cable CBL035 from LarsoneDavis The SRC20 accepts 8 16 Vdc 40 and is internally fused at 0 5 A WARNING 1 8 To insert the 9 volt battery in the SRC20 slide down the battery cover on the left hand side of the instru ment Insert the battery with the negative2. 2 6 sine log sweep 2 6 SINE LINEAR SWEEP sine function 2 6 SINE LOG SWEEP Sine function 2 6 SRC20 Accessories and Optional Equipment 1 7 Components 1 4 Features 1 3 General Features 1 3 optional equipment 1 7 System Diagram 1 6 STO key 2 2 Index 2 SRC20 User Manual 6 11 98
3. CURSOR and MODIFY keys Push the NEXT key again and set the END frequency to 20 000 by use of the CURSOR and MODIFY keys Push the NEXT key to access the Les level Since you want the return sweep to be attenu ated as much as possible set this to 40 dB Now the end to start level is 80 dB below the start to end level Push the NEXT Key to set the time it takes to go from the start of the sweep to the end of the sweep Set this to 60 seconds Step 10 Push the NEXT key to set the time it takes to go from the end of the sweep to the start Set this to 180 seconds 3 minutes 6 11 98 Setting Up and Using the SRC20 2 9 Step 11 Push the NEXT key to go to the LINEAR SWEEP window so that you can watch what is going on with the sweep On the screen you will see the gt gt Step 12 Push the MUTE key to turn on the SRC20 and lt lt They show output 7 sweeping start to end Step 13 Push MUTE when the test is completed Since you would like to use your setup at lt lt sweeping end to start another time you store the setup in memory 2 by pushing the STO key and then the 2 key Step 14 Turn the SRC20 off by holding down the OFF key for about two seconds 2 10 SRC20 User Manual 6 11 98 APPENDIX Technical Specifications Specifications are subject to change without notice Numerical values given are typical Refer to specific calibration or test results for accurate data on a specific
4. connector up Internal battery life is approximately 11 hours Refer to the description in Chapter 2 of this manual for additional battery information Inserting the battery incorrectly can cause damage to the unit If the SRC20 is not being used for long periods of time 3 months or more it is recommended that the battery be removed to avoid possible damage to the instru ment SRC20 User Manual 6 19 98 Automatic Battery Save Quick Start 6 19 98 Certain safeguards have been included The SRC20 will turn off when the usable battery voltage drops below 5 7 volts If the SRC20 stays in the mute mode for over 10 minutes while being powered by an internal 9 volt battery the SRC20 will automatically turn off to conserve battery power If the SRC20 is being powered by an external power source that maintains a voltage of greater than 9 5 volts the unit will not turn off after 10 minutes if in the muted mode The SRC20 will automatically switch between the internal battery or an external power source which ever is greater This section will help you turn on the SRC20 check the battery access the NOISE and SINE functions and turn the instrument off Step 1 Turn on the SRC20 by pressing the ON BATT key The Larson Davis name appears while booting up The serial number and revi sion number will also appear for a short time Step 2 Check the battery level After the SRC20 is turned on you can check the ba
5. Hz to 20 kHz It includes a pulse mode that is adjustable from 1 ms to 25 000 seconds lt 416 minutes Sinewave Generator Features The sinewave generator has a frequency response of 0 01 to 25 kHz The Sweep mode can be either linear or logarithmic with adjustable start to stop and stop to start times of between 1 ms and 25 000 seconds The log sweep has an adjustable sweep rates of between 0 001 to 20 decades second Introduction 1 3 The output level may be adjusted in each mode Different levels may be assigned in start to end and end to start while in sweep mode Remote Interface The SRC20 may be connected to and controlled by a computer with Microsoft Hypertext or other com munications program Sine waves of up to 126 kHz in 250 Hz increments may be accessed using the high sine command SRC20 Components Output Connector H8 LCD Display f N a pump 1 2 3 4 PREV Next lt gt MENU CURSOR OFF MUE MODIFY ON BATT ww Ne SYNTHESIZED SIGNAL SOURCE P P Serial Connector 7 6 cm Figure 1 1 SCR20 The SRC20 is a convenient hand held portable signal generator with a simple user intertace 1 4 SRC20 User Manual 6 19 98 The serial connector is used for external powering and computer interfacing 30 Q O5 QU Figure 1 2 Serial Connector The serial connector is a 5 pin Switchcraft connector with the following
6. OG logarithmic sweep and BRST burst and then SINE again as dis played on the screen To access the menu items associated with the SINE function use the PREV or NEXT key It will allow you to move through the various menu items Illustrated below is a chart showing the available menu settings Options using Menu Setting Options Level the Sine Func Accessed by using the Description tion key NEXT and PREV key SINE Frequency Adjust frequency by use of the MOD IFY and CURSOR keys The NEXT key will take you to the level adjustment Adjust the output level by use of the MODIFY and CUR SOR keys 6 11 98 Setting Up and Using the SRC20 2 5 SINE LINEAR SWEEP Start Frequency Lse End Frequency Les Tse Tes Adjust the start frequency by use of the CURSOR and MODIFY keys Adjust the output level for the start to end of the sweep The level immedi ately moves to this new level at the start of the sweep Adjusttheend frequency by useofthe MODIFY and CURSOR keys Adjust the output level for the end to the start of the sweep Adjust the time in sec it takes to move from start of the sweep to the end of the sweep Adjust the time in sec it takes to move from the end to the start of the sweep SINE LOG SWEEP Start frequency Lse End Frequency Les Rse Res Push the NEXT key to access the start frequency Adjust the start frequency of the l
7. SRC20 Signal Generator User Manual Larsone Davis Inc 1681 West 820 North Provo UT 84601 1341 Phone 801 375 0177 FAX 801 375 0182 www lardav com P N ISRC20 01 SRC20 USER MANUAL Copyright Copyright 1998 by Larson Davis Inc This manual is copyrighted with all rights reserved The manual may not be copied in whole or in part for any use without prior written consent of Larson Davis Inc Disclaimer The following paragraph does not apply in any state or country where such statements are not agreeable with local law Even though Larson Davis Inc has reviewed its documentation Larsone Davis Inc makes no warranty or representation either expressed or implied with respect to this documenta tion This documentation is subject to change without notice and should not be construed as a commitment or representation by Larsone Davis Inc This publication may contain inaccuracies or typographical errors LarsoneDavis Inc will periodically update the material for inclusion in new editions Changes and improvements to the program described in this manual may be made at any time Please examine your instrument and record the following information below You may be asked to give this information in any future communications you have with Larson Davis Inc SRC20 Serial Chapter 1 Chapter 2 App A App B Table of Contents Introduction 1 1 About This Manual utate et tate ore eletto uu d
8. age area 1 in which setups can be stored and recalled 2 NEXT NEXT Used to move down through menu items 2 Storage area 2 in which setups can be stored and recalled Left Arrow used to move the cursor through numbers for setting frequen cies levels and timing functions Numbers that can now be modified blink 3 Storage area 3 in which setups can be stored or recalled Right Arrow used to move the cur sor through numbers for setting fre quency levels and timing functions Numbers that can now be modified blink 4 Storage area 4 in which setups can be stored and recalled Up Arrow used to increase the value of numbers currently blinking Down Arrow used to decrease the value of numbers currently blinking Setting Up and Using the SRC20 2 3 Menu Items Noise Function To access various NOISE modes cycle though the vari ous options by pushing the NOISE key Depending on where you start pushing the NOISE key cycles as fol lows PINK PINK PULSE WHITE amp WHITE PULSE and then PINK again as displayed on the screen You may use the PREV key to get To access the menu items associated with the NOISE out of the menu area or you may function use the PREV or NEXT key It will allow you push the MUTE or NOISE function to move through the various menu items Below is a key at any time to quickly exit from chart that shows the available menu settings the menu area Options U
9. eos 1 1 About This Chapter ee eot ihid ee Gra d e ltd 1 2 Formatting CODvelitioDs oe Wat evi st os sites eremo tenho negseoteew tek 1 2 Peste ooo bo tm EH 1 3 SRC2 0 COomponebltes siise sisi breiten e HERR ges mtd RES 1 4 System Diagrami sprin seti etatis Todes ibd bus din a Inte 1 6 Getting Started oops aote ope oet p nbi dil 1 6 Unpacking and INS pec Onn x cates cic deter edo raining 1 7 Accessories and Optional Equipment sss 1 7 Connecting Internal or External P wet ui tete 1 8 Automatic Battery SdVEse io note i ien dor pes n VEN E AMA 1 9 Quick Start ouo ase AA ila eade eee 1 9 Environmental Considerations re deeper baa cibe pre ies 1 10 Setting Up and Using the SRC20 2 1 Menu Items bo e t medio tos utet 2 4 Noise Function tiisin ieiet ton bn dedi bre e eO Eee 2 4 Sine P rcti ri obe digerit ed attirer te 2 5 IMemotyr ouo Sims eve cer evasit centr erat mre ree dp EUR LC SUR RR 2 7 Setup Examples sodes e tas eter eE aaa o te ton e Beating niue satan wien 2 8 EXAMPLE Vous Saisie es titt reo Gi pert ee eee heed teen Dri 2 8 EXAMBLEE2 uaa e GHI ERE ta DOLAR AE Lud 2 8 Technical Specifications A 1 Pseudo Random Noise Characteristics sss A 4 Serial Port Interface Remote Control B 1 Interface C abIeSto date tt tv R pias B 1 Commands ca eocete tiae petet ceci ans tyre ca arena eee ee B 2 SRC20 USER MANUAL About This Manual 6 19 98 Introduction Welcome to the Lar
10. le A 2 SRC20 User Manual 6 11 98 Frequency Type linear or logarithmic Sweep Direction up or down Start Stop Frequency 0 01 Hz to 25 kHz direction changes at zero crossing Times 1 ms to 25 000 seconds Rates 0 001 to 20 decades second Sine Burst Cycles 1 to 999 million Pulsed Noise Times 1 ms to 25 000 seconds Mute At turn on or mode change the signal is muted Signal is manually unmuted Battery Reads internal battery voltage or exter nally applied voltage to tenths of a volt SRC20 turns off below 5 7 volts Battery Save SRC20 automatically turns off if volt age is below 9 5 volts and unit has been muted for 10 minutes Power Supply Internal 9 volt Battery NEDA 1604A IEC 6LR6 External 6 to 16 Vdc SRC20 uses internal or external which ever is higher Power Consumption 37 mA 9V 340 mW General Operating Environment 0 to 50 C 95 RH non condensing Dimensions W x Hx D 3x 1x 6 5 in 7 62 x 2 54 x 16 5 cm Weight 7 9 oz 246 grams Remote 5 Pin Switchcraft TB5M Pin 1 ground Interface male Pin 2 TXD output RS232 Pin 3 RXD input Pin 4 External power input Pin 5 Digital I O 6 11 98 Pseudo Random Noise Characteristics A 4 Modern noise generators are principally designed by digital synthesis This means that signals are not totally random However signals that do not repeat for a substantial time are functionally equivalent if the
11. mn and the rationale why you do it with other cautions and comments are shown in the right column You may get out of the Push the NEXT key to access the Les level Since you menu at any time by hit want the return sweep to be attenuated as much as ting the MUTE key or the possible set this to 40 dB Now the end to start level is SINE key This is useful 80 dB below the start to end level when you have to go into the menu to modify one of the settings Keys to press on the SRC20 are shown in a font repre senting the appropriate key For example Press the W key 1 2 SRC20 User Manual 6 19 98 Features 6 19 98 The Larsone Davis SRC20 has the following features General Two instruments in one pink and white noise gen erator and swept sinewave generator Setting up the generator is accomplished by simple menus accessed by well labeled keys Store and recall up to eight generator setups The signal is muted at turn on or with any mode change The output can be muted at any time by the touch of a key The power source voltage may be checked at any time The SRC20 is powered by an inexpensive easy to obtain 9 Volt battery When powered by the inter nal 9 Volt battery the SRC20 turns off when idle after 10 minutes in the mute mode It may also be powered with an external 8 to 16 Volt power sup ply Noise Generator Features The pink and white noise generator has a frequency response of 20
12. ne of eight nonvolatile memories four for the NOISE function and four for the SINE function Storing is simply done by pushing either the NOISE or SINE key the STO key and then one of the 1 2 3 or 4 memory keys This will store the current settings in the memory location you have cho sen To recall a previously stored setup push the NOISE or SINE key RCL key and then the relevant memory number key 6 11 98 Setting Up and Using the SRC20 2 7 Setup Examples EXAMPLE 1 EXAMPLE 2 2 8 You want to perform equalization of a sound system in a stadium You connect the SRC20 to either a micro phone or line level input of the sound system The sound system level should be turned down until the SRC20 is on and set Step 1 Turn the SRC20 on by pushing the ON key Wait for the unit to boot up Step 2 Check the battery voltage by holding down the ON BATT key to make certain the battery will last through the session it would be good to have an additional battery or AC power available Step 3 Push the NOISE key to access PINK noise If it doesn t immediately appear on the screen continue to push the NOISE key until PINK appears on the screen Step4 Adjustthe output level by using the CURSOR keys and MODIFY keys If you are using a microphone input to access the sound system adjust the level to around 80 dB Step 5 Now push the MUTE key to activate the out put Step 6 Turn the sound system up to the appropriate le
13. off insert the cable connector in the 5 pin port Step 2 Connect the cable to the of the computer Step 3 Open the communications software and con nect B 1 Commands RS 232 Port Pin configuration for the SRC20 is as fol lows Switchcraft 5 Pin Male Computer 9 pin RS 232C Connector on SRC20 Connector End Pin 4 Ext Power Supply No Connection PinS Digital JO Note HIGH SINE MODE is only available by the use of commands It extends the sine wave frequency response to 126 000 Hz in 250 Hz increments The commands are a series of ASCII characters with an alpha command and one or two numeric operands fol lowed by a carriage return line feed The following tables summarize all of the commands and are listed in this order GENERAL SINE MODE NOISE MODE HIGH SINE and SPECIAL COMMAND RESPONSE EXAMPLE GENERAL M Set to sine mode M1 Set to noise mode M59 Set to high sine mode OM or M Responds with number If you were to send the M com above mand you would get 1 cr If if you were in the noise mode SINE MODE B 2 SRC20 User Manual 6 18 98 F start end Set frequencies The end value is optional if no sweep Does not change mute sta tus F1000 09 21235 78 cr 1f will set start to 1000 09 Hz and end to 21235 78 Hz QF or F Will return set frequencies Lse es Set levels f
14. og sweep by use of the CUR SOR and MODIFY keys Adjust the output level of the start to end level of the sweep The level immediately goes to this new level at the start of this sweep Adjust the end frequency by use of the MODIFY and CURSOR keys Adjust the output level of the end to the start of the sweep Adjust the rate in decades second of the log sweep from the start to the end Adjust the rate in decades second of the log sweep from the end to the start 2 6 SRC20 User Manual 6 11 98 BURST Start Frequency Lse End Frequency Les Nse Nes Adjust the start frequency of the burst by use of the CURSOR and MODIFY keys Adjust the output level of the start to the end level of the burst Adjust the end frequency by use of the MODIFY and CURSOR keys Adjust the output level of the end to the start level of the burst Adjust the number of cycles it takes to get from beginning of the burst to the end of the burst 1 to 999 000 000 Adjust the number of cycles it takes to get from the end of burst to the start of burst 1 to 999 000 000 Memory Nonvolatile memory means that you are not dependent on the SRC20 bat tery to maintain the memory Setups that aren t stored are lost when the SRC20 is turned off You must be in either the main NOISE or SINE window and not in one of the menus windows to per form a setup store or recall The setups may be stored in o
15. or start to end and end to start sweeps Lse is used for non sweep modes It will unmute the source L100 40 00 QL or L Will respond with above settings S type se es Set the sweep type for sines and timing parameters If type is 0 No sweep If type is 1 Linear sweep se is time start to end and es is time end to start If type is 2 Log sweep se is rate start to end and es is rate end to start If type is 3 Burst sweep se is cycles start to end es is cycles end to start Mutes the source SO cr If no sweep S1 1 23 001 linear sweep 1 23 sec onds start to end 0 001 seconds end to start QS or S Will respond as above 6 18 98 NOISE MODE N type ton toff Type is 0 for pink Type is 1 for white Type is 2 for pulsed pink Type is 3 for pulsed white If pulsed ton is duration of high level and toff is dura tion off N command will mute the source QN or N Responds as above L level Sets noise level as above and unmutes the source QL or L Responds as above HIGH SINE MODE Warning the only com mands that may be used in this mode are the following two Sending other com mands while in the this mode will generate spuri ous noise superimposed on the sine wave H frequency In this case frequency is an level integer that is in units of 250 Hz i e 100 25 000 Hz Level is also an in
16. pinout 1 Ground 2 Transmit data negative output RS 232 levels 3 Receive data negative input RS 422 4 External power input 8 16 Vdc 40 mA 5 Digital I O 6 19 98 Introduction 1 5 System Diagram High Sine Filter Getting Started 1 6 Attenuator Output Buffer Select Be Ext Pwr Connector 9 15 V Figure 1 3 Block diagram of the SRC20 This section outlines the steps to follow when you first receive and unpack the SRC 20 The following topics are covered Unpacking and Inspection e Accessories and Optional Equipment Connecting Internal or External Power e Quick Start SRC20 User Manual 6 19 98 Unpacking and Inspection e Environmental Considerations Your SRC20 has been shipped in protective packaging Please verify the package contents with the following list Accessories and Optional Equipment and retain the shipping containers for safe shipment at a future date Report any damage or shortage immediately to Larson Davis Inc at 801 375 0177 Complete and return the Warranty Registration card It will allow us to keep you informed of any version updates If you have not already done so please record your instrument s serial number located on the label on the back of the SRC20 and the purchase date at the begin ning of this manual see the copyright page You may be asked to give this information in any future com munications you may have with Larsone Davis Inc
17. r in which they are typically used ON Turns on the SRC20 BATT BATT Push and hold to check the sup ply voltage 6 11 98 Setting Up and Using the SRC20 2 1 OFF MUTE OFF Hold down for about 2 seconds to turn the SRC20 off MUTE Push to activate output or push to deactivate signal generator output signal NOISE or Noise Function Key Push to activate the pink and white noise options Pushing the button cycles through the four available options Pink Pink Pulse White amp White Pulse SINE or Sine Function Key Push to activate the sine wave generator functions Pushing the button toggles through the four available sine wave options Sine wave single fre quency linear sweep logarithmic sweep and burst Note that in the SINE function with no sweeping or burst the upper left hand of the display shows nothing STO STO Store the current setup into one of eight registers for later recall 4 registers for the NOISE function and four for the SINE function This key would be followed by pushing one of the 1 2 3 or 4 keys RCL Recalls one of eight previously stored system setups up to four in the NOISE function and 4 in the SINE function Push either the NOISE or SINE function key the RCL key fol lowed by pushing one of the 1 2 3 or 4 keys 2 2 SRC20 User Manual 6 11 98 6 11 98 1 PREV PREV used to move up through menu items 1 Stor
18. repeat period is much longer than any system response to be tested The advantages of digital generation are repeatability and stability The noise generator in the SRC20 is a 24 bit shift register with feed back This cre ates a maximum length sequence of 2 1 samples long The sample rate is 102 4 KHz The sequence repeats about every 3 minutes The frequency shaping is con trolled by digital filters This makes the output spec trum very stable and accurate SRC20 User Manual 6 11 98 APPENDIX Interface Cables Baud rate Serial Port address and handshaking protocol are selected using the computer communication software The SRC20 uses a 9600 baud rate 1 stop bit and no parity 6 18 98 Serial Port Interface Remote Control The SRC20 is fully controllable remotely via the Serial Port interface Settings and operational mode can be altered This appendix will describe the Serial Port interfacing of the SRC20 and the various interface commands with their syntax Microsoft Hypertext or similar communi cation programs may be used to send commands out to the SRC20 Serial Port communications are made through the 5 pin connector at the base of the SRC20 The instru ment s signals conform to the RS232 standard using either the optional CBL101 or the CBL063 If addi tional length is needed a readily available computer serial cable may be used or you may use a Larson Davis CBL077 Step 1 With the instrument turned
19. sing Menu Setting Options Description PINK PULSE Level Noise Func Accessed by using the tion Key NEXT and PREV key PINK Level Adjust output level between 40 to 120 dB by use of the modify keys The cur sor can be moved by use of the right or left cursor keys Adjust output level Ton The NEXT arrow will take you to the Ton menu item Adjust the time the pink noise is on Toff Push the NEXT key again to set the time the pink noise is off WHITE Level Adjust the output level between 40 and 120 dB by the use of the Modify keys The cursor may be moved by use of the Cursor keys 2 4 SRC20 User Manual 6 11 98 WHITE PULSE Level Ton Toff Adjust the output level Push the NEXT key to go to the Ton menu item Adjust the time the White noise is on Push the NEXT key again to set the time the white noise is off Sine Function Note that in the SINE function with no sweeping or burst the upper left hand of the display shows nothing You may use the PREV key to get out of the menu area or you may push MUTE or NOISE function key at any time to quickly exit from the menu area Note that the generator will immedi ately become unmuted as soon as the MUTE switch is pushed To access various SINE functions toggle through the various options by pushing the SINE key Depending on where you start pushing the SINE key toggles as follows SINE LIN linear sweep L
20. soneDavis SRC20 Function Gener ator Although many users discover the features and operation of the SRC20 by glancing at its keypad we invite you to read this manual to get the most out of your new Larson Davis function generator This manual has 2 chapters and 2 appendices covering the following topics Chapter 1 Introduction overview of this user manual and the SRC20 s features amp functions unpacking the SRC20 quick start procedures Chapter 2 Setting Up and Using the SRC20 overall system setup description of each key along with its function and displays working with menus Appendices Appendix A Technical Specification Technical Discussion and Specifications listing of electronic environmental and physical characteristics of the SRC20 Appendix B Serial Port Interface Remote Control How to control the SRC20 using remote commands Index Introduction 1 1 About This Chapter Specifically this introductory chapter covers the fol lowing topics Formatting Conventions Explanation of the fonts and other formatting conventions used in this man ual Model SRC20 Features A listing of the characteris tics of the SRC20 keypad and function Getting Started Instructions for unpacking inspecting and initially assembling the SRC20 Formatting Conventions This manual uses the following format conventions In step by step directions the process what you do is shown in the left colu
21. teger range 0 to 32767 The value is scaled so that 32767 is 1 volt QH or H Responds as above SPECIAL COMMANDS Will reboot the SRC20 QV or V Will read the battery volt age It will return hex value in 1 volt units B 4 SRC20 User Manual 6 18 98 Numerics 1 key 2 3 2 key 2 3 3 key 2 3 4 key 2 3 B BATT key 2 1 BURST Sine function 2 7 C Connector Serial Connector 1 5 Conventions Formatting 1 2 D Down Arrow key 2 3 F Format Conventions 1 2 Formatting Conventions 1 2 K Keypad 2 1 Keys BATT 2 1 down arrow 2 3 left arrow 2 3 MUTE 2 2 NOISE 2 2 ON 2 1 to 2 2 PREV 2 3 RCL 2 2 right arrow 2 3 6 11 98 Index SINE 2 2 STO 22 storage area 1 2 3 storage area 2 2 3 storage area 3 2 3 storage area 4 2 3 L Left Arrow key 2 3 Memory storing setups 2 7 MUTE key 2 2 N NOISE key 2 2 Noise Function 2 4 Pink 2 4 pink pulse 2 4 white 2 4 white pulse 2 5 O OFF key 2 2 ON key 2 1 P Pin B 2 Pin configurations B 2 PREV key 2 3 Index 1 Q Quick Start 1 9 R RCL key 2 2 Right Arrow key 2 3 RS 232 interface B 1 S Serial number 1 7 Setups examples 2 8 storage area 1 2 3 storage area 2 2 3 storage area 3 2 3 storage area 4 2 3 storing 2 7 SINE key 2 2 sine function 2 5 Sine function burst 2 7 sine 2 5 U Unpacking and Inspection 1 7 Up Arrow key Keys up arrow 2 3 W White Pulse noise function 2 5 sine linear sweep
22. ttery level To do this press the ON BATT key again Hold the key down as long as you would like Step 3 Press the NOISE and then SINE function keys and notice how it switches between the two modes or functions Step4 If the output of the SRC20 is connected to an amplifier and speaker you can hit the OFF MUTE key to generate an output signal Introduction 1 9 Step 5 Turn off the instrument To do this press and hold the OFF MUTE key for about two sec onds The instrument then turns off Environmental Considerations 1 10 The SCR20 can be used and stored in a wide range of temperatures which are free of moisture and condens ing humidity conditions However common sense precautions should be taken For example allow the SRC20 ample time to adjust to abrupt temperature changes Condensation may form inside a cold instru ment if it is brought into a warm room or vehicle and may persist long after the outside case has adjusted to the ambient temperature Temperatures inside closed vehicles can also reach excessive levels Therefore do not leave the instrument in direct sunlight in a vehicle SRC20 User Manual 6 19 98 Setting Up and Using the SRC20 This chapter contains information on the functions which are accessed through the SRC20 keypad rc ros sve 1 2 3 4 PREV NEXT lt MENU CURSOR OFF MODIFY ON BATT v Figure 2 1 SRC20 Keypad These keys are covered in the orde
23. unit Frequency Sine Wave 0 01 Hz to 25 kHz Characteristics Pink Noise 20 Hz to 20 kHz White Noise 1 Hz to 20 kHz High Sine 250 Hz to 126 kHz Sine Wave Harmonic Distortion Spectral Purity 1 Hz to 10 kHz 80 dBc 10 kHz to 20kHz 65 dBc 6 11 98 A 1 Output Characteristics Sine Wave Amplitude into 210 k ohm Sine Wave Accuracy at 1 KHz Sine Wave Flatness relative to 1 KHz High Sine Flatness relative to 1 Khz Only available using computer command High Sine Frequency Resolution High Sine Amplitude Accuracy at 1 kHz High Sine Amplitude Resolution Pink Noise Output Level set at 120 dB White Noise Output Level set at 120 dB Output Impedance Connector 40 to 120 dBuV 100 LV to 1 Vrms 0 02 dB max 10 KHz 0 1 dB max 10 KHz to 16 kHz 40 2 dB max 10 KHz to 20 kHz 40 2 dB max 16 kHz to 20 kHz 40 4 dB max 20 kHz to 25 kHz 40 8 dB max 250 Hz to 10 kHz 0 00 dB 0 1 dB 12 5 kHz 0 02 dB 0 1 dB 15 75 kHz 0 04 dB 0 1 dB 20 0 KHz 0 06 dB 0 1 dB 25 0 kHz 0 10 dB 0 2 dB 31 5 kHz 0 16 dB 0 3 dB 40 0 KHz 0 26 dB 0 4 dB 50 0 kHz 0 41 dB 0 6 dB 63 0 kHz 0 65 dB 0 8 dB 79 4 kHz 1 02 dB 1 0 dB 100 0 KHz 1 55 dB 1 5 dB 126 0 KHz 2 30 dB 2 0 dB 250 Hz 0 1dB 0 01 dB 0 04 to 0 058 Vrms 0 0476 Volts 26 4 dBV Typical 0 25 to 28 Volts 0 27 Volts 11 3 dBV Typical 50 ohms BNC Fema
24. vel to perform the test The SRC20 s output level may also be adjusted if its output level is too low or too high Step 7 Push the MUTE key when the test is complete or to get ready for an additional test Step 8 Push and hold the OFF key to turn the SRC20 off You need to perform a test in a laboratory and need a linear swept sine wave in your test The frequency sweep needs to go from 20 Hz to 20 000 Hz and take one minute to go from the start to the end of the sweep SRC20 User Manual 6 11 98 You may get out of the menu at any time by hitting the MUTE key or the SINE key This is useful when you have to go into the menu to mod ify one of the settings You want the end to start sweep attenuated as much as possible and don t want it to start the next sweep until 3 minutes after the previous Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 You can choose to operate the SRC20 using the internal battery or you may choose to plug the external power supply into it Turn the SRC20 on by pushing the ON key Wait for it to boot up You may want to check the battery voltage to make certain your external power supply is working satisfactorily Push and hold the ON BATT key Continue to push the SINE key until the LIN screen appears Push the NEXT key and set the Start Fre quency to 20 Hz with the Cursor and Modify keys Push the NEXT key and set the level to 120 dB by use of the
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