4040DDS User Manual
Contents
1. Use termination or impedance matching devices to avoid reflections 5 Ensure that attenuators and terminations have adequate power handling capabilities If there is a DC voltage across the output load use a coupling capacitor in series with the load The time constant of the coupling capacitor and load must be long enough to maintain pulse flatness Impedance Matching If the waveform generator is driving a high impedance such as the 1 Mohm input impedance paralleled by a stated capacitance of an oscilloscope vertical input connect the transmission line to a 50 ohms attenuator a 50 ohms termination and to the oscilloscope input The attenuator isolates the input capacitance of the device and terminates the waveform generator properly 3 6 FUNCTION Keys These keys select the main menus for displaying and changing a parameter function or mode 3 6 1 WAVEFORM Keys The keys select the waveform output and displays the waveform parameters frequency amplitude or offset The SINE RAMP and SQUARE pushbuttons select the output waveform A build in LED indicates the waveform selected Freq 1 000 KHz AA Amp 5 00 Y Pu Sine Menu FREQ button Frequency Selects and displays the frequency Change the frequency setting using the cursor keys and the rotary knob This pushbutton returns to Frequency display from any other menu displayed AMPL Knob Changes the waveform Amplitude OFST button Selects the Offset parameter Change2. 4040DDS Operating Manual 1 1 Introduction Introduction This manual contains information required to operate the MODEL 4040DDS 20MHz DDS Function Generator This section covers the instrument general description instrument specifications and characteristics Please note that the RS 232 connector on the back of the unit is not to be used as a programming or user interface It is for factory use only 1 2 Description The MODEL 4040DDS is a versatile high performance function generator that produces Sine Square and Triangle signals Waveforms can be output in continuous triggered or gated mode AM and FM modulation combined with versatile Sweep capabilities make the unit suitable for a wide range of applications 1 3 MODEL 4040DDS SPECIFICATIONS FREQUENCY CHARACTERISTICS STANDARD WAVEFORMS Sine Square Triangle Ramp Accuracy Resolution OUTPUT CHARACTERISTICS Amplitude Range Resolution Amplitude Accuracy Flatness Offset Range Offset Resolution Offset Accuracy Output Impedance Output Protection WAVEFORM CHARACTERISTICS Harmonic Distortion Spurious Square Rise Fall Time Variable Duty Cycle Symmetry at 50 0 1 Hz to 20 MHz 0 1 Hz to 20 MHz 0 1 Hz to 2 MHz 0 01 100 ppm 4 digits or 10 mHz 10mV to 10Vp p into 50 ohms 3 digits 1000 counts 2 20mV of the programmed output from 1 01V 10V 0 5 dB at IMHz 1 dB to 20 MHz 4 5V into 50 ohms depending
3. KHz bandwidth Sine signal of 1000 Hz 5 Vp p for 100 deviation 10 Kohms input impedance DC to 20 KHz bandwidth Linear and Logarithmic up or down 10 ms to 50 s TTL compatible Max rate 2MHz Minimum width 50ns TTL pulse at programmed frequency 50 ohms source impedance 5 Vp p for 100 modulation 10 KQ input impedance Dc to gt 20 KHz minimum bandwidth 8 4 inch 213 mm wide 3 5 inch 88 mm high 8 3 inch 210 mm deep Aprox 2 5 Kg 90V 264V 30 VA max Operating 0 C to 50 C Non operating 10 C to 70 C According to EN55011 for radiated and conducted emissions According to EN55082 According to EN61010 Specifications are verified according to the performance check procedures in the technical manual Specifications not verified in the manual are either explanatory notes or general performance characteristics only Model 4040DDS Operating Manual Section 2 Installation 2 1 Introduction This section contains installation information power requirements initial inspection and signal connections for MODEL 4040DDS Function Generator 2 2 Mechanical Inspection This instrument was carefully inspected before shipment Upon receipt inspect the instrument for damage that might have occurred in transit If there is damage due to shipping file a claim with the carrier who transported the unit The shipping and packing material should be saved if reshipment is required If the original contai
4. precautions apply to both operating and maintenance personnel and must be observed during all phases of operation service and repair of this instrument Before applying power follow the installation instructions and become familiar with the operating instructions for this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument B amp K Precision Corporation assumes no liability for a customer s failure to comply with these requirements This is a Safety Class I instrument GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cabinet must be connected to an electrical ground This instrument is grounded through the ground conductor of the supplied three conductor ac power cable The power cable must be plugged into an approved three conductor electrical outlet Do not alter the ground connection Without the protective ground connection all accessible conductive parts including control knobs can render an electric shock The power jack and mating plug of the power cable meet IEC safety standards DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard KEEP AWAY FROM LIVE CIRCUITS Instrument covers must not be removed by oper
5. BK EMC JO FATE Model 4040DDS 20 MHz DDS Function Generator OPERATING MANUAL v092711 Model 4040DDS Operating Manual Limited Three Year Warranty B amp K Precision warrants to the original purchaser that its products and the component parts thereof will be free from defects in workmanship and materials for a period of three years from date of purchase from an authorized B amp K Precision distributor B amp K Precision will without charge repair or replace at its option defective product or component parts Returned product must be accompanied by proof of the purchase date in the form of a sales receipt To obtain warranty coverage in the U S A this product must be registered by completing the warranty registration form on www bkprecision com within fifteen 15 days of purchase Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs The warranty is void if the serial number is altered defaced or removed B amp K Precision shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitations of incidental or consequential damages So the above limitation or exclusion may not apply to you This warranty gives you specific rights and you may have other rights which vary from state to state Service Information Warranty Service Please go to our website w
6. al Freq 1 000 KHz A Amp 5 00 4 A Mode Trig Ext External Trigger Menu Freq 1 000 KHz A Ampli 5 00 W Vy Mode Gate Ext External Gate Menu 3 6 3 SWEEP Key Selects the Sweep Mode and allows LINEAR or LOGARITHMIC sweep mode To select the sweep mode press SWEEP Each pushbutton operation selects the LIN LOG or OFF mode The Sweep Start Stop and Rate parameters are changed with the Utility key Freq Lin Sweep Ti Amp 5 00 AT LIN SWEEP ON LIN Sweep Menu Freq Log amar 500 EM LOG SWEEF ON LOG Sweep Menu 3 6 4 UTILITY Key amet 5 00 y PAM sweep otart 2 000 KHz Utility Menu Selects the Sweep parameters editing mode The Sweep Start Sweep Stop and Sweep Rate parameters are displayed and can be modified with the rotary knob Last parameter available on this menu is the Intensity mode Intensity Change the intensity and contrast of the LCD display for optimal viewing angle 14 3 6 5 MODULATION Key Selects the Modulation mode AM or FM To select the output mode press MODUL key Each additional operation selects the AM FM or OFF mode Freq 1 000 KHz Amp 500 AM 50 AM Menu The AM depth from 0 to 100 is changed with the rotary knob Freq 1 000 KHz ire Ampli 5 00 W ExT AM Modulation FM Menu The FM deviation frequency is changed with the rotary knob 3 6 6 COUNTER Key By pressing this key the build in Frequency counter is ena
7. ating personnel Component replacement and internal adjustments must be made by qualified maintenance personnel Disconnect the power cord before removing the instrument covers and replacing components Under certain conditions even with the power cable removed dangerous voltages may exist To avoid injuries always disconnect power and discharge circuits before touching them DO NOT SERVICE OR ADJUST ALONE Do not attempt any internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT Do not install substitute parts or perform any unauthorized modifications to this instrument Return the instrument to TEXIO for service and repair to ensure that safety features are maintained WARNINGS AND CAUTIONS WARNING and CAUTION statements such as the following examples denote a hazard and appear throughout this manual Follow all instructions contained in these statements A WARNING statement calls attention to an operating procedure practice or condition which if not followed correctly could result in injury or death to personnel A CAUTION statement calls attention to an operating procedure practice or condition which if not followed correctly could result in damage to or destruction of part or all of the product WARNING Do not alter the ground connection Without the protective ground connection all accessible conductive par
8. bled and the frequency of the signal connected to the TRIG IN connector is displayed The counter is auto ranging with up to 8 digits resolution Counter Freq 6334 Hz Counter Menu 3 7 Cursor Movement Keys Use these keys to move the cursor when visible either left or right They are used in conjunction with the rotary input knob to set the step size of the rotary input knob 3 8 Rotary Input Knob Use this knob to increase and decrease numeric values or to scroll through a list The cursor indicates the low order position of the displayed value which changes when you rotate the knob for straight numeric entries only For other types of data the whole value changes when you rotate the knob 15 Model 4040DDS Operating Manual 16 3 9 Power On Settings At power on the waveform generator performs a diagnostic self test procedure to check itself for errors If it find an error and error code and text appear in the display window Other error codes appear when you enter and invalid front panel setting When the waveform generator finishes the diagnostic self test routine it enters the power on default settings Table 3 2 lists the factory default settings Key Function FREQUENCY AMPLITUDE FUNCTION OFFSET REPETITION MODE TRIG SOURCE SWEEP MODULATION 1000 Hz 5 00V SINE 0 00V 10ms CONT EXT OFF OFF Table 3 2 Power on Default Settings Comments Wave frequency Peak to peak output amplitu
9. de Output waveform Zero offset Internal trigger rate Waveform mode External trigger source Sweep execution Modulation execution 17
10. he instrument when properly connected to the ground wire and plugged into proper receptacle WARNING TO AVOID PERSONAL INJURY DUE TO SHOCK THE THIRD WIRE EARTH GROUND MUST BE CONTINUOUS TO THE POWER OUTLET BEFORE CONNECTION TO THE POWER OUTLET EXAMINE ALL CABLES AND CONNECTIONS BETWEEN THE UNIT AND THE FACILITY POWER FOR A CONTINUOUS EARTH GROUND PATH THE POWER CABLE MUST MEET IEC SAFETY STANDARDS 2 7 Signal Connections Use RG58U 50 Ohm or equivalent coaxial cables for all input and output signals to and from the instrument 1 4 TECHNICAL SUPPORT If this product fails to operate upon arrival contact your B amp K PRECISION dealer or the factory to arrange for service or exchange To arrange technical assistance or for service contact the factory at B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 714 921 9095 www bkprecision com Model 4040DDS Operating Manual Section 3 Operating Instructions 3 1 General Description This section describes the displays controls and connectors of the MODEL 4040DDS Function Generator All controls for the instrument local operation are located on the front panel The connectors are located on both front and rear panels BK PRECISION Model 4040DDS 20MHz DDS SWEEP FUNCTION GENERATOR ca e AMPLITUDE OFFSET te COUNTER TRIG IN MODULATION IN SYNC OUT OUTPUT Figure 3 1 MODEL 4040DDS Front Panel 1 Power ON OFF Applies and remove
11. ner is not to be used then use a heavy carton box Wrap the unit with plastic and place cardboard strips across the face for protection Use packing material around all sides of the container and seal it with tape bands Mark the box FRAGILE 2 3 Initial Inspection After the mechanical inspection verify the contents of the shipment accessories and installed options If the contents are incomplete or if the instrument does not pass the specification acceptance tests notify the local service center 2 4 Instrument Mounting The MODEL 4040DDS Function Generator is intended for bench use The instrument includes a front feet tilt mechanism for optimum panel viewing angle The instrument does not require special cooling when operated within conventional temperature limits The unit can be installed in a closed rack or test station if proper air flow is assured for removing about 15 W of power dissipation 2 5 Power Requirements The MODEL 4040DDS can be operated from any source of 90V to 264V AC frequency from 48Hz to 66Hz The maximum power consumption is 30 VA Use a slow blow fuse UL CSA approved of 1A as indicated on the rear panel of the instrument The instrument power fuse is located in the AC input plug To access the fuse first disconnect the power cord and then remove the fuse cartridge 2 6 Grounding Requirements For the safety of operating personnel the instrument must be grounded The central pin on the AC plug grounds t
12. on the Amplitude setting 10 mV with 3 digits resolution 2 10mV into 50 ohms 50 ohms The instrument output is protected against short circuit or accidental voltage practically available in electronic laboratories applied to the main output connector 0 20 KHz 50 dBc 20 KHz 100 KHz 45 dBc 100 KHz 1 MHz 40 dBc 1 MHz 20 MHz 30 dBc DC 1MHz lt 55 dBc lt 20ns 10 to 90 at full amplitude into 50 ohms 20 to 80 to 2 MHz for Square and 10 90 for Triangle lt 1 OPERATING MODES Continuous Triggered Gate Trigger Source Output continuous at programmed parameters Output quiescent until triggered by an internal or external trigger then one waveform cycle is generated to programmed parameters up to 2 MHz Same as triggered mode except waveform is executed for the duration of the gate signal The last cycle started is completed Trigger source may be internal external or manual Internal trigger rate 10us to 10s MODULATION CHARACTERISTICS Amplitude Modulation Internal External Frequency Modulation Internal External SWEEP CHARACTERISTICS Sweep Shape Sweep Time INPUTS AND OUTPUTS Trigger In Sync Out Modulation IN GENERAL Dimensions Weight Power Temperature EMC Electrical Discharge Immunity Safety Specifications NOTE Sine signal of 1000 Hz Variable modulation from 0 to 100 in 1 steps 5 Vp p for 100 modulation 10 Kohms input impedance DC to 20
13. s AC power to the unit 2 Display Window Displays all instrument data and settings on a LCD 3 Function Keys Select the output waveform Sine Square Triangle or the MODE SWEEP and MODULATION 4 Rotary Knob Used to increment decrement numerical values or to scan through the possible selections 5 Modify Keys Used to move the cursor when visible to either left or right 10 3 2 Display Window The MODEL 4040DDS has a graphic LCD display that can display up to 122 x 32 dots When you power on the unit the SINE is selected and its current settings appear in the display The bottom displays a status line that corresponds to the function parameter or mode displayed selected 3 3 Front Panel Controls The front panel controls select display and change parameter function and mode settings Use the rotary input knob and the cursor movement keys to enter data into the waveform generator To change a setting 1 Press the key that leads to a required item 2 Move cursor using cursor keys to the appropriate position in the numeric field if applicable 3 Use the rotary input to change the value of the displayed item Changes take effect immediately The following subsections describe the function of each front panel key and connector 3 4 Connectors The function generator has all BNC connectors on the front panel where you can connect coaxial cables These coaxial cables serve as carrier lines for input and output signal
14. s delivered to and from the function generator Output Connector Use this connector to transfer the main output signal from the function generator Trig In Connector Use this connector to apply an external trigger or gate signal depending on the waveform generator setting to the generator This connector is also the input to the build in counter activated by pressing the COUNT pushbutton Sync Out Connector Use this connector to output a positive TTL sync pulse generated at each waveform cycle Modulation In Connector SV p p signal for 100 modulation 10Kohms input impedance with DC gt 20 KHz bandwidth 3 5 Output Connections The waveform generator output circuits operate as a 50 ohms voltage source working into a 50 ohms load At higher frequencies non terminated or improperly terminated output cause aberrations on the output waveform In addition loads less than 50 ohms reduce the waveform amplitude while loads more than 50 ohms increase waveform amplitude Excessive distortion or aberrations caused by improper termination are less noticeable at lower frequencies especially with sine and triangle waveforms To ensure waveform integrity follow these precautions 1 Use good quality 50 ohms coaxial cable and connectors 2 Make all connections tight and as short as possible 11 Model 4040DDS Operating Manual 3 Use good quality attenuators if it is necessary to reduce waveform amplitudes applied to sensitive circuits 4
15. the offset by using the cursor keys and Amplitude Offset rotary knob If a certain setting cannot be produced the waveform generator will display a Setting Conflict message Amplitude and Offset Interaction Amplitude and offset settings interact and are bound by hardware restrictions In order to obtain the desired waveform the following amplitude and offset hardware limitations must be considered Freq 1 000 KHz AA Offset 0 00 W Pa Offset Menu 12 The offset voltage has three ranges as follows Output Voltage Range Constraints of Amplitude Offset 1 01 volt to 10 00 volts Vp p 2 loffsetl lt 5 volts 0 101 volt to 1 volt Vp p 2 loffsetl lt 0 5 volts 0 010 volt to 0 100 volt Vp p 2 loffsetl lt 0 05 volts DUTY button When the Square or Triangle waveforms are selected the variable SYMMETRY is available Change the waveform symmetry by using the cursor keys and rotary knob If a certain setting cannot be produced the waveform generator will display a warning message Symmetry Menu 3 6 2 MODE Key Selects the output mode CONT Continuous TRIG Triggered and GATE Gated To select the output mode press MODE Each additional MODE key operation selects TRIG GATE or CONT operating mode Internal or External trigger source Freq 1 000 KHz 3 00 4 Ampl Mode Cont Mode Menu Internal Trigger Menu 13 Model 4040DDS Operating Manu
16. ts including control knobs can render an electric shock The power jack and mating plug of the power cable meet IEC safety standards Model 4040DDS Operating Manual WARNING To avoid electrical shock hazard disconnect power cord before removing covers Refer servicing to qualified personnel CAUTION Before connecting the line cord to the AC mains check the rear panel AC line voltage indicator Applying a line voltage other than the indicated voltage can destroy the AC line fuses For continued fire protection replace fuses only with those of the specified voltage and current ratings CAUTION This product uses components which can be damaged by electro static discharge ESD To avoid damage be sure to follow proper procedures for handling storing and transporting parts and subassemblies which contain ESD sensitive components Contents Section 1 Section 2 Section 3 Introduction 1 2 Descriprionis inni ea oi 7 1 3 Specification Lie bia rela 7 Installation 2 1 Introductioni ssriia lella nabla lla SE eat Lila lionel 9 24 Instrument Mounting 5 33 eli anse dial hints 9 2 5 Power requirements ii 5 Melissa blind RAS Reet 9 2 6 Grounding requirements piaga 9 Operating Instructions 3 1 General Description iter ll sed Liliana 11 3 4 Connectors rca lie lume ne le eae Bele de ile he li el 12 3 6 F ncthon nd Lasi ale La ea dn 13 3 10 Power on Settings lla ole eat 17 Section 1 Model
17. ww bkpreicsion com amp click on the service repair button to obtain an RMA Return the product in the original packaging with proof of purchase to the address below Clearly state in writing the performance problem and return any leads probes connectors and accessories that you are using with the device Non Warranty Service Please go to our website www bkpreicsion com amp click on the service repair button to obtain an RMA Return the product in the original packaging to the address below Clearly state in writing the performance problem and return any leads probes connectors and accessories that you are using with the device Customers not on open account must include payment in the form of a money order or credit card For the most current repair charges please visit www bkprecision com and click on service repair Return all merchandise to B amp K Precision Corp with pre paid shipping The flat rate repair charge for Non Warranty Service does not include return shipping Return shipping to locations in North American is included for Warranty Service For overnight shipments and non North American shipping fees please contact B amp K Precision Corp B amp K Precision 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 Include with the returned instrument your complete return shipping address contact name phone number and description of problem Safety Summary The following safety
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