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4075 & 4078 User Manual

1. 2 E 0 2 4 5 5 221 MMPODUCHON se 5 2 2 1 5 223 5 2 4 stumet Mounting 2 REIRA AEREN AARIN 5 2 5 5 2 6 nareread anra aE pen e AR 5 2 7 Grounding 6 2 8 Signal COMMECUGNS 6 2 9 RS 232 Comme ction 44 110 ddaeareg inpia aan
2. 41 4512 45 413 41 49 4 14 1 488 21 Interface ENAERE EEEE RREA SEEREN AEAEE ES EAER E 77 415 SCRI COMMANG Tee E E A A E E A E AE 77 4 16 Block Transfer GPIB Only EE t 82 417 GPB Commun aO POTO O 83 EE E E E E E E TE 87 Performance Check 87 A MMOGOUCTON 87 5 2 6 22 EAR ARISKE ARAS 87 5 37 TE 88 Section 1 Introduction 1 1 Introduction This manual contains information required to operate program and test the Model 4075 and 4078 25 MHz DDS Arbitrary Function Generators This section covers the instrument general description instrument sp
3. SINISQUITRI ARB FREQuency lt value gt AMPLitude OFFSet SOURce DCYCle lt value gt lt value gt STATe ONIOFF LOWEfrequency lt value gt SOURce HIFrequency lt value gt RATE lt value gt SOURce INT EXT SWEep STATe ONIOFF SPACing LINILOG TIME lt value gt STARt lt value gt PULSe PERiod STOP lt value gt WIDth EDGe RISe FALI 4 15 3 OUTPut Subsystem OUTPut STATe ON OFF 4 15 4 TRIGger Subsystem TRIGger MODE BURSt SOURce TIMer CONT lt value gt INT lt value gt TRIG EXT GATE MAN BURS BUS 4 15 5 ARBitrary Subsystem ARBitrary PRATe ADDRess lt gt lt gt DATA STARt LENGth 5 lt value gt lt value lt value gt DRAW lt start gt lt end gt CLEar lt start gt lt end gt RANGe 5 lt start gt lt end gt ONIOFF PROTect lt start gt lt length gt lt destination gt MARKer plete PENGIN lt address gt ONIOFF lt VALUE gt PREDefined lt shape gt lt start address gt lt length gt lt scale gt 4 15 6 STATus Subsystem STATus OPERation 22221 CONDtion ENABle PTRansition NTRansition lt value gt lt value gt lt value gt QUEStionable e
4. Examples Query Syntax Examples Response Numeric MHz KHz Hz default Dependent on the carrier frequency Fmax carrier frequency Fmin 10 uHz The value is rounded to 4 digits Setting or Query SOURce FM DEViation lt ws gt lt frequency gt units SOURce FM DEViation lt ws gt MINimumIMAXimum FM DEV 5KHZ FM DEV 5E3 FM DEV MAXIMUM FM DEV MIN SOURce FM DEViation lt ws gt MAXimumIMINimum FM DEV FM DEV MAX NR3 4 13 1 8 3 FM SHAPe This command selects the FM modulating waveform shape Arguments Type Options Command Type Setting Syntax Examples Query Character SINusoid TRIangle SQUare Setting or Query SOURce FM SHAPe lt ws gt lt SINITRIISQU gt SOURce FM SHPE SIN FM SHAPE TRI Syntax SOURce FM SHAPe Response SINITRIISQU 4 13 1 8 4 FM FREQuency This command sets the FM modulating waveform frequency Arguments Type Numeric Units MHz KHz Hz default Range Fmax 20 KHz Fmin 0 01 Hz Rounding The value is rounded to 4 digits Command Type Setting or Query Setting Syntax SOURce FM FREQuency lt ws gt lt frequency gt units SOURce FM FREQuency lt ws gt MINimumIMA Ximum Examples FM FREQ 5KHZ FM FREQ 5E3 FM FREQ MAXIMUM FM FREQ MIN Query Syntax SOURce FM FREQuency lt ws gt MAXimumIMINimum Examples FM FREQ FM FREQ MAX Response NR3 4 13 1 8 5 FM SOURce This command selects the FM modulation source as eithe
5. 4 13 1 12 3 PULse EDGe This command sets both rising and falling edge of the pulse to the specified value Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Response Numeric S mS uS nS 100 nS minimum maximum defined by period and width see note above 4 digits Setting or Query SOURce PULse EDGe lt ws gt lt value gt SOURce PULse EDGe lt ws gt MINimumIMAXimum SOURce PULse EDGe 500NS SOURce PULse EDGe lt ws gt MINimum IMA Ximum NR3 4 13 1 12 4 PULse RISe This command sets rising edge of the pulse to the specified value Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Response Numeric S mS uS nS 100 nS minimum maximum defined by period and width see note above 4 digits Setting or Query SOURce PULse RISe lt ws gt lt phase gt SOURce PULse RISe lt ws gt MINimumIMA SOURce PULse RISe 500NS SOURce PULse RISe lt ws gt MINimumIMAXimum NR3 4 13 1 12 5 PULse FALI This command sets falling edge of the pulse to the specified value Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Response 4 13 1 13 Numeric S mS uS nS 100 nS minimum maximum defined by period and width see note above 4 digits Setting or Query SOURce PULse FALI lt ws gt lt phase g
6. Command Type Setting Syntax Examples Query Syntax Response 4 13 1 10 Character INTernal EXTernal Setting or Query SOURce FSK SOURce lt ws gt lt INTIEXT gt FSK SOUR INT FSK SOUR EXT SOURce FSK SOURce INTIEXT Sweep control The following commands control the sweep functionality 4 13 1 10 1 Sweep STATe This command activates or deactivates sweep Arguments Type Command Type Setting Syntax Examples Query Syntax Response Boolean Setting or Query SOURce S WEEP STATe lt ws gt ONI1 OFFIO SWEEP STAT ON SWEEP OFF SOURce SWEEP STATe 4 13 1 10 2 Sweep SPACing This command sets the sweep spacing as either LINear or LOGarithmic Arguments Type Options Command Type Setting Syntax Examples Query Syntax Response Character Linear Logarithmic Setting or Query SOURce SWEEP SPACing lt ws gt lt LINILOG gt SOURce SWEEP SPACing LIN SWEEP SPAC LOG SOURce SWEEP SPACing LINILOG 4 13 1 10 3 Sweep TIME This command sets the time for one complete sweep Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Response Numeric S mS uS nS 20mS to 5005 to 4 digits Setting or Query SOURce SWEEP TIME lt ws gt lt time gt units SOURce SWEEP TIME lt ws gt MINimumIMAXimum SWEEP TIME 50MS SOURce SWEEP TIME lt ws gt MINimumIMAXimum NR3 4 13 1 10 4 Sw
7. Syntax ARBitrary CLEar lt ws gt lt start address gt lt end address gt Examples ARB CLE 1 1000 Considerations 1 The clear range cannot overlap with protected memory 2 The end address must be greater than start address 4 13 4 6 Copy ARBitrary COPY lt start address gt lt length gt lt destination address gt This command is used to copy a section of the waveform to a different location in waveform memory Arguments Type NRf Range 1 to 400 000 Rounding to integer value Command Type Setting only Setting Syntax ARBitrary COPY lt ws gt lt start gt lt length gt lt destination gt Example ARB COPY 1 1000 1001 Considerations 1 The destination range cannot overlap with protected memory 2 The destination range cannot overlap with the source range 3 The destination end address may not exceed the maximum address Destination address Length 1 lt 131072 4 13 4 7 Memory Protection Range ARBitrary PROTect RANGe lt start address gt lt end address gt This command is used to define a range of arbitrary waveform memory to be write protected The protection is effective only if the PROTect STATe is ON Arguments Type Numeric Numeric Range 1 to 400 000 Rounding to integer value Command Type Setting or Query Setting Syntax ARBitrary PROTect RANGe lt ws gt lt start gt lt end gt Examples ARB PROT 1 1E3 Query Syntax ARBitrary PROTect RANGe Response l
8. The waveform generator uses a non volatile FLASH memory for storing arbitrary waveform data and front panel settings Up to 400 000 points Arbitrary waveform and 50 front panel settings are stored These front panel settings can be used to store starting address and lengths of many different waveforms stored in memory as reference points for quick recall Because it is impossible to guarantee 100 of the time against loss of stored data you should maintain a record of the data stored in memory so that you can manually restore such data if necessary 3 12 Displaying Errors At power on the waveform generator performs a diagnostic routine to check itself for problems If the diagnostic routine finds an error an error message is displayed The waveform generator also displays error messages when front panel settings are either invalid or may produce unexpected results Error messages for Model 4075 4078 Message Text Cause Out of range Attempt to set variable out of instrument limits 3 13 3 14 Setting conflict Can t have this parameter set with some other Trig rate short Internal trigger rate too short for wave burst Empty location Attempt to restore non existent setting SCALE too high Attempt to set scale too high for current dot value Protected RAM Attempt to write to protected RAM range Save RAM New firmware installed Must divide by 4 Predefined wave length must be divisible by 4 Must divide by 2 Predefined
9. 0 OFF Queries return the values 0 or 1 iii NRf iv v vi This is a decimal numeric data type where NRI indicates an integer number NR2 indicates a fixed point real number and NR3 indicates a floating point real number Expression data An expression is contained in parentheses This data type is used only with the STATus QUEue ENABle command Numeric value program data This data type defines numeric values as well as special cases of Character Data Numeric values may be specified in any of Integer Fixed Point or Floating Point format All parameters which have associated units accept a suffix which may be specified using upper or lower case characters When the suffix is not specified the numeric value is accepted in the default units which are Hertz for frequency Seconds for time and Volts for voltage To set the frequency to 1 KHz we can send one of the following commands FREQ 1000 FREQ 1E3 The special forms of character data accepted as numbers are MAXimum sets the parameter to its maximum value MINimum sets the parameter to its minimum value For example to set the frequency to its maximum value we can send the command FREQ MAX Arbitrary Block Data The Arbitrary block data type is used to send arbitrary waveform data to the instrument In this data type the waveform points are specified in binary format and each point consists of two bytes Two types of arbitrary block data are define
10. 180 other values converted to this range to integer Setting or Query SOURce PHASe lt ws gt lt phase gt SOURce PHASe lt ws gt MINimum IMAXimum SOURce PHASe 50035 SOURce PHASe lt ws gt MINimum IMA Ximum Response NR3 4 13 1 12 PULSe setting The following commands control the pulse function Note that width 0 6 rise fall lt period in order to have valid values Width lt Period 10 ns 4 13 1 12 1 PULSe PERiod This command sets the pulse period to the specified value NOTE This also sets the pulse frequency Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Response Numeric S mS uS nS 10015 10005 4 digits Setting or Query SOURce PULse PERiod lt ws gt lt value gt SOURce PULse PERiod lt ws gt MINimumIMAXimum SOURce PULse PERiod 500NS SOURce PULse PERiod lt ws gt MINimum IMA Ximum NR3 4 13 1 12 2 PULse WIDth This command pulse width to the specified value Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Numeric S mS uS nS 20 nS minimum maximum defined by period and transition see note above 4 digits Setting or Query SOURce PULse WIDth lt ws gt lt value gt SOURce PULse WIDth lt ws gt MINimumIMAXimum SOURce PULse WIDth 500NS Syntax Response SOURce PULse WIDth lt ws gt MINimum IMA NR3
11. Setting Syntax ARBitrary LENGth lt ws gt lt length gt ARBitrary LENGth lt ws gt MINimumIMAXimum Example ARB LENG 1E3 Query Syntax ARBitrary LENGth lt ws gt MINimumIMA Ximum Example ARB LENG Response NRI Considerations 1 Changing the wavelength will change either the frequency 2 The minimum wavelength is 2 4 13 4 12 Marker Address ARBitrary MARKer ADDRess lt marker address gt This command is used to set the address of the marker Arguments Type Numeric Range 1 to 400 000 Rounding to integer values Setting Syntax ARBitrary MAR Ker ADDRess lt ws gt lt marker address gt Examples 45 Query Syntax ARBitrary MAR Ker ADDRess Example ARB MARK Response Marker address format Considerations The marker is only output if its address is within the range of addresses currently being run 4 13 4 13 Marker Length ARBitrary MARKer LENGth lt numeric value gt This command is used to set the marker length The maximum allowed length of marker is 4000 The marker length is specified by appending a numeric value to the MARKer keyword Maximum MARKER Length 4000 points Arguments Type Numeric Command Type Setting or Query Setting Syntax ARBitrary MARKer LENGth lt ws gt lt length gt Example 5 Syntax ARBitrary MARKer LENGth Response NRI 4 13 4 14 Marker State ARBitrary MARKer STATe lt Bool
12. a L EVENt CONDtion ENABle PTRansition NTRansition lt value gt lt value gt lt value gt oie PRESet QUEue NEXT lt gt 4 15 7 SYSTem Subsystem SYSTem gt COMMunicate SECurity POBuffer VERSion GPIB STATe lt value gt ADDRess ON OFF lt value gt ASCII and GPIB Code Chart Hex Oct Dec ASCII Msg Hex Oct Dec ASCII 00 000 0 NUL 20 040 32 SP 01 001 1 SOH 21 041 33 02 002 2 5 22 042 34 03 003 3 23 043 35 04 004 4 EOT SDC 24 044 36 05 005 5 PPC 25 045 37 06 006 6 26 046 38 amp 07 007 7 27 047 39 08 010 8 BS GET 28 050 40 09 011 9 HT TCT 29 051 41 012 10 LF 2A 052 42 Msg MLAO MLA1 MLA2 MLA3 MLA4 5 MLA6 MLA7 MLA9 MLA10 OB OC 0 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F Hex 40 41 42 43 44 45 46 47 48 49 4A 4B 4 40 013 1l VT 014 12 FF 015 13 CR 016 14 SO 017 15 SI 020 16 DLE 021 17 LLO 022 18 DC2 023 19 DC3 024 20 DC4 DCL 025 21 026 22 SYN 027 23 ETB 030 24 5 031 25 SPD 032 26 SUB 033 27 5 034 28 FS 035 29 GS 036 30 RS 037 31 05 Message Definitions DCL Device Clear GET Group Execute Trigger GTL Go To Local LLO Local Lockout MLA My Listen Address Oct Dec ASCII Msg 100 64 MTAO 101 65 A 1 102 66 2 103 6
13. device to the LOCS If the device is in the RWLS the return to local command is ignored and the device remains in the RWLS The only way to then re establish communication with the device over the GPIB is to cycle the power and to then change the address to that required from the front panel 4 5 Message Exchange Protocol The device decodes messages using the Message Exchange Protocol MEP defined in IEEE 488 2 The following functions implemented in the MEP must be considered 4 5 1 The Input Buffer The device has a 256 byte long cyclic input buffer Decoding of remote messages begins as soon as the input buffer is not empty that is as soon as the controller has sent at least one byte to the device Should the input buffer be filled up by the controller faster than the device can remove the bytes and decode them the bus handshake is not completed until room has been made for more bytes in the buffer This prevents a fast controller from overrunning the device with data If the user has sent part of a Program Message but not the Program Message Terminator and he wishes to abort the message decoding and execution the Device Clear command may be sent or front panel operation resumed in REMS only 4 5 2 The Output Queue The device has a 100 byte long output queue in which it stores response messages for the controller to read If at the time a response message is formatted the queue contains previously formatted response messages s
14. the LLO message changes the waveform generator to the front panel lockout state REN Remote Enable GPIB pin 17 REN is normally held true by the controller and allows the controller to then put the waveform generator into one of the remote states Pulsing REN false or holding it false forces the device into local state LOCS NOTE If you disconnect and reconnect the GPIB cable when the controller is holding REN true the REN goes false and the device got to local state LOCS GTL Go To Local 1 with ATN Listen addressed instruments respond to GTL by changing to a local state Remote to local transitions caused by GTL do not affect the execution of the message being processed when GTL was received Remote Local Operation Most front panel controls cause a transition from REMS to LOCS by asserting a message called return to local rtl This transition can occur during message execution However in contrast to TGL and REN transitions a transition initiated by rtl affects message execution In this case the waveform generator generates an error if there are any unexecuted setting or operational commands Front panel controls that change only the display do not affect the remote local states Only front panel controls that change settings assert rtl The rtl message remains asserted when you enter multiple keystroke settings from front panel and is unasserted after you execute the settings changes Since rtl prevents transition t
15. 161 Invalid block data An error was found in the block data 168 Block data not allowed 170 Expression error Only 6 error ranges may be specified 171 Invalid expression An error was found in the expression 178 Expression data not allowed Execution Errors An execution error indicates that the device could not execute a syntactically correct command either since the data were out of the instrument s range or due to a device condition The EXE bit bit 4 of the Standard Event Status Register is set on occurrence of an execution error 200 Execution error An attempt was made to RECALL the contents of an uninitialized stored setting buffer 201 Invalid while in local 211 Trigger ignored The GET or TRG common command was ignored due to the device not being in the correct state to execute the trigger 220 Parameter error A parameter is in the correct range but conflicts with other parameters 221 Settings conflict The parameter is out of range due to the current instrument state 222 Data out of range 223 Too much data The arbitrary waveform memory limit has been exceeded 224 Illegal parameter value The parameter value must be selected from a finite list of possibilities 258 Media protected An attempt was made to write to protected arbitrary waveform memory Device Specific Errors An error specific to the device occurred The DDE bit bit 3 of the Standard Event Status Register is set 315 Conf
16. ASCII coded characters to the instrument When the instrument is in the remote mode remote command input has priority over any front panel control Therefore as long as the serial interface is continuously supplied with data the keyboard will appear to be inoperative to the user Note In remote mode any command sent or receive via RS232 will change the display screen with the following Remotely Controlled 5232 User can return to local control with the press of any front panel keys but it is extremely important to note that this should be done ONLY when nothing is being sent or transferred between the instrument and the connected PC Any interruptions during transfer may delay the communication process For large waveforms transmission be it sending or receiving please allow at least 15 seconds before pressing any front panel keys to return to local mode The instrument needs the additional time to completely generate or send the waveform instrument accepts a carriage return CR as end of string EOS terminator and sends both a CR and LF as the EOS terminator 4 2 Device State The device may be in one of the four possible states described below The transition between states is defined by TEEE 488 1 4 2 1 Local State LOCS In the LOCS the device may be operated from the front panel only Its settings may be queried over the GPIB but not changed Commands that do not affect the signal being output by the i
17. Resolution 12 digits or 1 Hz Sine Triangle Square Noise Ramp Up Ramp Down Built in Waveforms Sine X X Exponential Up Exponential Down Gaussian Waveform Length 2 points to 400 000 points Arbitrary Vertical Resolution 14 bits 16 384 levels Characteristics Noise Add 1 to 100 to output waveform 100 MSa s Point execution rate adjustable from 10 ns ampling Rate to 50 s Frequency Accuracy 0 005 50 ppm Frequency Resolution 4 digits Amplitude Range 10 mV to 10 Vp p into 50 ohms Amplitude Resolution 3 digits 1000 counts Amplitude Accuracy at 1 kHz 1 1 mV 0 2 dB to 1 MHz Flatness relative to 1 kHz 1 dB to 25 MHz Output Offset Range 5 V into 50 depending on the Amplitude setting Characteristics Offset Resolution 10 mV with 3 digits resolution Offset Accuracy 1 10 mV into 500 Output Impedance 50 Q typical Output Protection The instruments output is protected against short circuit or nominal accidental voltages applied to the main output connector Output Leakage Approximately 10 mA can be present at the output BNC connector when unit is powered on and the output is off Waveform Characteristics Total Harmonic Distortion sine DC 20 kHz 65 dBc 20 kHz 50 kHz 60 dBc 50 kHz 100 kHz 50 dBc 100 2 10 MHz 45 dBc 10 MHz 25 MHz 35 dBc Spurious sine DC 1 MHz lt 60 dBc Rise Fall Time Square pulse lt 12ns 10 to 90 at full amplitude
18. Units MHz KHz Hz default Range Fmax 20 KHz Fmin 0 01 Hz Rounding The value is rounded to 4 digits Command Type Setting or Query Setting Syntax SOURce AM FREQuency lt ws gt lt frequency gt units SOURce AM FREQuency lt ws gt MINimum IMA Ximum Examples AM FREQ 5KHZ 5E3 AM FREQ MAXIMUM AM FREQ MIN Query Syntax SOURce AM FREQuency lt ws gt MA XimumIMINimum Examples AM FREQ Response NR3 4 13 1 7 5 AM SOURce This command selects the AM modulation source as either internal then the above settings are effective or external and then the external waveform determines depth shape and frequency of modulation Arguments Type Character Options INTernal EXTernal Command Type Setting or Query Setting Syntax SOURce AM SOURce lt ws gt lt INTIEXT gt Examples Query Syntax Response AM SOUR INT AM SOUR EXT SOURce AM SOURce INTIEXT 4 13 1 8 FM modulation The following commands control the FM modulation 4 13 1 8 1 FM STATe This command activates or deactivates FM modulation Arguments Type Command Type Setting Syntax Examples Query Syntax Response Boolean Setting or Query SOURce FM STATe lt ws gt ONILIOFFIO FM STAT ON FM OFF SOURce FM STATe 4 13 1 8 2 DEViation This command sets the FM modulation deviation Arguments Type Units Range Rounding Command Type Setting Syntax
19. for OFF ASCII 1 for ON When set to ON 1 the Service Request Enable Register and the Standard Event Status Enable Register are cleared on power on e SRE Service request enable command This command sets the Service Request Enable Register bits Arguments Type NRf Range 0 to 255 Non integer arguments are rounded before execution The value of bit 6 is ignored and is set always to zero Type Common Command or Query Command Syntax SRE lt ws gt lt NRf gt Examples SRE 48 Enables reporting of ESB and events Query Syntax SRE Response lt NRI gt f STB Status byte query This query is used to read the value of the Status Byte Type Common Query Syntax STB Response lt NRI gt The value of the Status Byte read with the STB query may differ from that read with the Serial Poll Bit 6 of the STB will be set as long as a reason for requesting service exists while bit 6 of the STB as read by the Serial Poll is cleared by the Serial Poll 4 12 5 Device Trigger Commands a TRG Trigger command This command is analogous to the IEEE 488 1 Group Execute Trigger interface message and has the same effect It is used to trigger the device to output a wave and is accepted only when the trigger mode is set to Trigger Gate or Burst and the trigger source is set to BUS Type Common Command Syntax TRG 4 12 6 Stored Settings Commands a RCL Recall instrument state This command is used to
20. into 50 O Variable Duty Cycle 20 to 80 to 5 MHz square 40 to 60 to 10 MHz square 50 gt 10 MHz square Variable Symmetry 10 90 to 5 MHz triangle Symmetry at 50 lt 1 5ns Linearity triangle ramp lt 0 1 of peak output 1 uHz to 250 kHz Pulse Width period 10 us 0 1 us 20 ns to lt Period 20 ns 10 ns resolution Variable Edge Time period 100 us 0 16 us 100 ns to Width 0 625 50 duty cycle 10 ns resolution Operating Modes Continuous Output continuous at programmed parameters Output quiescent until triggered by an internal or external trigger then one waveform cycle is generated tuggered to programmed parameters Up to 10 MHz trigger rate for ARB waveforms and 5 MHz in DDS mode Same as triggered mode except waveform is executed Gate for the duration of the gate signal The last cycle started is completed Burst 2 999 999 cycles Phase 360 0 to 360 degrees with 0 1 degree resolution Trigger Source Trigger source may be internal external or manual Internal trigger rate 0 01 Hz 1 MHz 1 us 100 s Internal 0 1 Hz 20 kHz sine square or triangle waveform Amplitude variable modulation from 0 to 100 Modulation External 5 Vp p for 100 modulation 10 input impedance 0 01 Hz 50 KHz bandwidth Characteristics Internal 0 1 Hz 20 kHz sine wave square or
21. is read by the controller during a serial poll If the RQS bit was set it is then cleared The STB may also be read by the STB common query 4 11 2 Service Request Enabling Service request enabling allows the user to select which Status Byte summary messages may cause the device to actively request service This is achieved using the Service Request Enable Register which is an 8 bit register whose bits correspond to those of the STB The RQS bit in the STB is set when a bit in the STB is set and its corresponding bit in the service request enable register is set The service request enable register is set using SRE common command and read using 5 common query 4 11 3 Standard Event Status Register The Standard Event Status Register SESR is defined by IEEE 488 2 It is implemented in the instrument as a byte whose bits have the following definitions Bit 0 Operation Complete OPC This bit is set in response to common command being executed Bit 1 Request Control Not implemented Bit 2 Query Error QYE This bit is set when either the controller is attempting to read data from the device when none is available or when data prepared for the controller to read has been lost Bit 3 Device Specific Error DDE This bit is set to indicate that a device operation did not execute due to some device condition For example trying to recall an uninitialized device stored setting Bit 4 Ex
22. line screens are not isolated from chassis and signal ground 1 2 3 4 5 6 7 8 9 10 11 12 Section 3 Operating Instructions 3 1 General Description This section describes the displays controls and connectors of the Model 4075 and 4078 Function Generators All controls for the instrument local operation are located on the front panel The connectors are located on both front and rear panels Figure 3 1 Front Panel View 1 Power ON OFF Applies and removes AC power to the unit 2 Display Window Displays all instrument data and settings on a LCD 3 FI F4 Keys Select the menu options that appear on the second line of the LCD display Menus differ depending on the selected parameter function or mode 4 Function Keys Select the output waveform Sine Triangle Square Pulse or Arbitrary 5 Rotary Knob Used to increment decrement numerical values or to scan through the possible selections 6 Cursor Keys Used to move the cursor when visible to either left or right when modifying values of various parameters 7 Output ON Controls the main output signal The output status is ON when lid 8 Channel Selects the channel to configure model 4078 only 9 Numerical Keypad Numeric entry keys for entering values for various functions and modes 10 Unit Setting Keys Quick keys for setting units for frequency time and amplitude 11 Enter Key Used for saving settings and numerical
23. using the IEEE 488 1 Service Request function and the IEEE 488 2 Status Reporting structure 4 11 1 The Status Byte Status summary information is communicated from the device to the controller using the Status Byte STB The STB is composed of single bit summary messages each summary message summarizing an overlying Status Data Structure By examining the content of the STB the controller gains some information concerning the instrument s status The STB bits are defined as follows 0 Unused Bit 1 Unused Bit 2 Error event queue summary message EVQ This bit is set if the queue is not empty Bit 3 Questionable Status summary message Bit4 Message Available MAV summary message This bit is set whenever all or part of a message is available for the controller to read The controller may be ready to read the response message before it is available in which case it can either wait until this bit is set or it can start to read In the second case the controller timeout must be set so that the read action will not be aborted before the message has been read Bit5 Event Status Bit ESB summary message This bit is set to indicate that one or more of the enabled standard events have occurred Bit 6 Request Service RQS This bit is set when the device is actively requesting service Bit 7 Operation Status summary message No Operation Status events are defined in the instrument and so this bit is never set The STB
24. values 12 Mode Key Select from continuous triggered burst gate or phase mode 13 Sweep Key Enters into the sweep menu to configure sweep settings 14 Modul Key Enters into the modulation menu for selecting modulation functions 15 Util Key Used for remote settings system setup save restore and power settings 16 Channel Output Dual BNC channel outputs 50 2 of function signals model 4075 has CH1 only 3 2 Display Window The Model 4075 and 4078 have graphic LCD displays that can display up to 124 x 64 dots When you power on the unit the SINE function is selected and its current settings appear in the display The bottom displays a menu that corresponds to the function parameter or mode display selected 1 000 000 000 KHz lt O AmplS 00 i Ofst 0 00 4 lem Figure 3 2 LCD Display Screen 1 Channel Display Displays the current selected channel For model 4078 only 2 General Waveform Display Displays the general waveform being generated in the channel Note Waveform shown is approximated and scaled down It does not show the exact representation of the waveform at the output 3 Frequency Sweep Mode Display Displays the frequency values currently set to In sweep mode it displays the sweeping type Linear or Logarithmic 4 Menu Functions Display Displays the menu options available Use F1 F4 keys on front panel to select the options 5 Menu Parameters Valu
25. wave length must be divisible by 2 Using Model 4075 and 4078 This section explains how to generate various waveforms and modify the output waveforms 3 13 1 Selecting a Standard Waveform You can select several standard waveforms as sine triangle and square Creating a standard waveform requires selecting the waveform type parameters modes etc and their settings that define the waveform Generating a standard waveform requires the following Selecting the waveform by pushing any of the waveform buttons Sine Ramp Square Pulse or Arb Setting the output frequency by using the rotary input knob or numeric keypad to enter the desired frequency Setting the output amplitude and offset by selecting the option in the function menu and using the rotary input knob or numeric keyboard to enter the desired amplitude and or offset 3 13 2 Setting the Output Mode To set the output mode 1 Press MODE to display the Mode menu on the display window 2 Press the function key Fl to F4 that corresponds to the desired mode Choose from Continuous Trigger Burst and Gate mode You can also adjust the Phase in the same menu 3 13 3 Setting the Output To set the output channel press the Output ON key An internal LED is illuminated to indicate that the Output is ON Examples 3 14 1 Creating an Arbitrary Waveform You can create an arbitrary waveform using the following methods Enter individual data points Draw li
26. your complete return shipping address contact name phone number and description of problem LIMITED THREE YEAR WARRANTY B amp K Precision Corp 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 B amp K Precision Corp 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 a warranty registration form on our website 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 Corp 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 B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 Safety Summar
27. 0 1 The start address and the length must meet the specification that Start address Length 1 lt 131 072 2 The scale refers to the scaling of the waveform as a percentage of full scale A scale of 100 will under the correct conditions generate a waveform whose data values range from 8191 to 8191 These correct conditions are set by the offset value This offset is the value of the data at the start address and determines the maximum scale settable The following table shows the data values required in order to achieve maximum scale SHAPE SIN SQU TRI NOIS DATA 0 0 0 0 4 13 4 10 Start Address ARBitrary STARt lt start address gt This command sets the start address of the waveform to be run Arguments Type Numeric Range 1 to 399 999 Rounding to integer value Command Type Setting or Query Setting Syntax ARBitrary STARt lt ws gt lt start address gt ARBitrary STARt lt ws gt MINimumIMA Ximum Example 100 Query Syntax ARBitrary STARt lt ws gt MINimumIMA Ximum Examples 5 MIN NRI Considerations The start address and length must meet the condition Start Address Length 1 lt 400 000 4 13 4 11 Wavelength ARBitrary LENGth lt length gt This command sets the length of the waveform being run Arguments Type Numeric Range 2 to 400 000 Rounding to integer value Command Type Setting or Query
28. 00 and press ENTER it will display 1999 Selects the length of the arbitrary waveform Use the START and LENGTH menu selection to mark a selection of the waveform memory that will be executed Note The length value must always be an even number If you input an odd number length a message will pop up and say Even wave length and then decrement one value to an even number For example if you entered 1001 as the length the message will pop up for one second and change the value automatically to 1000 F2 SAVE ARB Selecting this will save the current Arbitrary waveform data points so that it be recalled when revisiting ARB menu later on or when power cycling the instrument Note The 4075 and 4078 can both save multiple numbers of waveforms because the instruments have one large memory bank to store up to 400 000 points total Essentially the user can store multiple waves with various lengths in different locations in the memory This can be done simply by generating each of the waveforms with different starting addresses As long as the lengths of each do not overlap user can save as much waveforms with different lengths as desired Total points of all waveforms cannot exceed 400 000 points If user has multiple waveforms to create and do not want to remember all the different starting addresses and lengths there is a STORE and RECALL feature explained in section 3 6 6 that will allow y
29. 07 7 30 3147 Mn ee 30 34 34 4 eee ale 34 42 Device State a aaa a a daaa aa aaa eaa ee 35 4 3 Interface Function SuBSetS iin aa an ead een ian dated 35 4 4 ie a 35 4 5 Message Exchange 36 4 6 Block Data GPIB Only s nee iniii a vaca AE I N i 37 a o AENA 37 4 0 0 E EN AA 37 19 37 4 10 Command Syntax kinei a aaa aaa 37 2 11 Status
30. 5 update the waveform The following shows the structure of the ARBitrary subsystem ARBitrary PRATe lt numeric value gt ADDRess lt numeric gt DATA lt numeric value gt lt arbitrary block gt lt value gt lt numeric value gt CLEar lt numeric value gt lt numeric value gt lt NRf gt lt NRf gt lt NRf gt PROTect RANGe lt numeric value gt lt numeric value gt 5 lt Boolean gt PREDefined lt shape gt lt start address gt lt length gt lt scale gt STARt lt value gt LENGth lt numeric gt MARKer ADDRess lt numeric value gt 5 lt Boolean gt LENGth lt numeric value gt 5 Note For model 4078 nothing changes in the commands above to control channel 1 But for channel 2 change ARB to ARB2 For example to change channel 2 to ARB mode with a predefined square wave from address 1 with length of 2000 and scale factor of 50 first send the command for channel to go into arbitrary waveform mode SOUR2 FUNC ARB then send the command ARB2 PRED SQU 1 2000 50 When sending or receiving large waveforms with any software or custom programmed applications please allow AT LEAST 15 seconds or more after the process is completed on the PC before pressing any front panel keys to return to local mode The instrument requires this extra time to completely receive or send the waveform 4 13 4 1 Point Rate ARBitrary PRA
31. 66 118 v MSA22 PPD 57 127 87 W MTA23 77 167 119 MSA23 PPD 58 130 88 X 24 78 170 120 x MSA24 PPD 59 131 89 Y MTA25 79 171 121 MSA25 PPD 5A 132 90 Z MTA26 7A 172 122 2 MSA26 PPD 5B 133 91 MTA27 7B 173 123 MSA27 PPD 5C 134 92 MTA28 7C 174 124 MSA28 PPD 5D 135 93 MTA29 70 175 125 MSA29 PPD 5 136 94 TE 176 126 MSA30 PPD 5F 137 95 E UNT 7F 177 127 DEL Message Definitions PPE Parallel Poll Enable SPE Serial Poll Enable PPU Parallel Poll Unconfigure TCT Take Control SDC Selected Device Clear UNL Unlisten SPD Serial Poll Disable UNT Untalk 4 16 Block Transfer GPIB only Arbitrary waveform data sent in IEEE488 2 arbitrary block format may take two forms the definite form and the indefinite form The essential difference between these forms is that the definite form contains a byte count while the indefinite form does not In both cases the format of the command is ARB DATA lt ws gt lt preamble gt lt data gt lt terminator gt The lt data gt represents the arbitrary waveform data This field consists of 8 bit bytes sent in hexadecimal form Each arbitrary data point consists of two bytes with the high byte being sent first When sending data in this way the value of a data point may range from 8191 corresponding to the negative peak to 8191 corresponding to the positive peak The value 0 corresponds to zero baseline Compare the ASCII or front panel representation which defines data in the rang
32. 7 C 104 68 D MTA4 105 69 E 5 106 70 6 107 71 G MTA7 110 72 H 8 111 73 I MTA9 112 74 1 10 113 75 K MTA11 114 76 L MTA12 115 77 M MTA13 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 053 054 055 056 057 060 061 062 063 064 065 066 067 070 071 072 073 074 075 076 077 MSA MTA PPC PPD Hex Oct 60 140 61 141 62 142 63 143 64 144 65 145 66 146 67 147 68 150 69 151 6A 152 6B 153 6C 154 6D 155 43 MLA11 44 MLA12 45 MLA13 46 14 47 15 48 0 16 49 1 MLA17 50 2 MLA18 51 3 MLA19 52 4 MLA20 53 5 MLA21 54 6 MLA22 55 7 MLA23 56 8 MLA24 57 9 MLA25 58 26 59 27 60 lt 28 61 MLA29 62 gt MLA30 63 UNL My Secondary Address My Talk Address Parallel Poll Configure Parallel Poll Disable Dec ASCII Msg 96 MSAO PPE 97 a MSA1 PPE 98 b MSA2 PPE 99 c MSA3 PPE 100 d MSA4 PPE 101 e MSA5 PPE 102 f MSA6 PPE 103 g MSA7 PPE 104 h MSA8 PPE 105 i MSA9 PPE 106 j MSA10 PPE 107 k MSA11 PPE 108 MSA12 PPE 109 m MSA13 PPE 4 116 78 14 6E 156 110 n MSA14 PPE 4F 117 719 O 15 6F 157 111 o MSA15 PPE 50 120 80 P MTA16 70 160 112 p MSA16 PPD 51 121 81 Q MTA17 71 161 113 q MSA17 PPD 52 122 82 R MTA18 72 162 114 MSA18 PPD 53 123 83 5 19 73 163 115 5 MSA19 PPD 54 124 84 T MTA20 74 164 116 t MSA20 PPD 55 125 85 U 21 75 165 117 MSA21 PPD 56 126 86 V MTA22 76 1
33. ASE SET ZERO SWEEP not available PULSE ARB mode o o START STOP LINILOG MODUL ON OFF SHAPE EXT INT FM not available in PULSE and ARB mode ON OFF DEYV SHAPE FREQ EXT INT o not available in PULSE and ARB mode ON OFF F HI F LO RATE EXT INT UTIL o 8232 lt o RECALL STORE o POWER 3 6 1 WAVEFORM Keys The keys select the waveform output and displays the waveform parameter menu frequency amplitude and offset When the Arbitrary waveform is selected the display shows also the waveform rate 1 000 000 000 KHZ Ampls 00 1 Ofst 0 00 5 PME Sine Menu F1 FREQ Frequency Selects and displays the frequency Change the frequency setting using the cursor keys and rotary knob or numerical keypad If a certain wavelength can t produce the waveform at the desired frequency the waveform generator displays an Out of Range error message 1 FREQ RATE Selects and displays the Point Rate for Arbitrary Waveform mode only The Rate parameter governs the rate at which waveform points are executed and thus the frequency of the waveform output will also be affected When you set this parameter the waveform generator will keep that execution rate for all waveform lengths until it is changed Selects th
34. BK PRECISION Model 4075 4078 25 MHz Arbitrary Function Generator USER MANUAL SERVICE INFORMATION Warranty Service Please go the support and service section on our website www bkprecision com to obtain RMA Return the product in the original packaging with proof of purchase to the address below Clearly state on the RMA the performance problem and return any leads probes connectors and accessories that you are using with the device Non Warranty Service Please go the support and service section on our website www bkprecision com to obtain a RMA Return the product in the original packaging to the address below Clearly state on the RMA the performance problem and return any leads probes connectors and accessories that you are using with the device Customers not on an open account must include payment in the form of a money order or credit card For the most current repair charges please refer to the service and support section on our website 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 America 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 Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 Include with the returned instrument
35. Buffer lt ws gt lt buffer gt IMINimumIMA Ximum Example SYST POB 99 Query SYSTem POBuffer lt ws gt MINimum IMA Ximum Response Power on buffer in NR1 format 4 14 IEEE 488 1 Interface Messages 4 14 1 GET Group Execute Trigger The GET is used by the AWG as a trigger when it is in either the TRIGGER GATE or BURST modes with the trigger source set to BUS It has the same effect as the TRG common command 4 14 2 DCL Device Clear In response to the DCL the AWG does the following a Clears the input buffer and the output queue b Resets the Message Processing Functions 4 14 3 SDC Selected Device Clear The response is as for the DCL message when device is addressed to listen 4 14 4 LLO Local Lockout Sending LLO when device is addressed to listen and controller is asserting the REN line will put the device into Remote with Lock out state locking out the front panel 4 15 SCPI Command Tree 4 15 1 Root Node Root Sa 1 SOURce OUTPut TRIGger ARBitrary STATus SYSTem 4 15 2 SOURce Subsystem SOURce FREQuency VOLTage REFerence FUNCTION PHAse AM STATe ONIOFF DEPTh lt value gt 5 SINISQUITRI CWIFIXed LEVel SOURce SHAPe ADJust FREQuency lt value gt SOURce lt value gt IMMediate INT SIN lt value gt STATe ONIOFF EXT SQU DEViation lt gt TRI 5
36. F being sent with EOI true The Program Message Unit can be divided into three sections as follows a Program Header The Program Header represents the operation to be performed and consists of ASCII character mnemonics Two types of Program Headers are used in the 4075 amp 4078 Instrument control headers and Common Command and Query headers A Program Header may consist of more than one mnemonic in which case the mnemonics are separated from each other by the colon 7 For instrument control commands the mnemonics are specified by the SCPI standard and indicate the tree structure of the command set The first mnemonic indicates the subsystem being controlled Common Command and Query Program Headers consist of a single mnemonic prefixed by an asterisk mnemonics consist of upper lower case alpha characters Mnemonics may be written in either long form in which the entire mnemonic is written out or the short form in which only a specified portion of the mnemonic is written out Some mnemonics have only one form due to their short length Where a command is described the portion appearing in upper case is the short form Only the short form or the long form may be used Example The command to set the frequency to may be written in the following ways SOURCE FREQUENCY SOUR FREQ 1KHZ SOURCE FREQ 1 KHZ Some mnemonics in a specified Program Header may be optional This is indicated in the command de
37. F2 FROM DATA Selects the starting point of the generated waveform and data value LENG SCALE Selects the length of the predefined waveform number of points for a full wave The length value must be a number that is divisible by 4 or by 2 in some instances If not a pop up message will say Must divide by 4 or Must divide by 2 and entered values will change back to its original Different waveforms have different limitations on the length Refer to Table 3 1 below If scale is too high a message will display Scale too high Table 3 1 Waveform Length Limits for Predefined Waveforms Wave Minimum Length Divisible by Sine 16 4 Triangle 16 4 Square 2 2 Noise 16 1 F3 SCALE Selects the scale factor of the waveform 100 means that the waveform spans the full scale of 8191 to 8191 Scale factors are limited by the point data 4 value of the starting point and automatically calculated by unit F4 EXEC Prompts you to confirm whether to execute the selected predefined waveform Press NO to abort executing the predefined waveform press YES to execute the predefined waveform On the NOISE function a menu of ADD and NEW is prompt to select a new noise waveform or to add noise to the existing waveform Displays the following Menu 1 000 KHz AmplS 00 ae Ofat 0 00 w aee PeP Arbitrary Option Display F1 COPY Displays the Copy menu see the Copy Func
38. I 4 13 5 4 5 Event Enable Register STAT QUES ENABle This command is used to set and query value of enable register Arguments Type NRf Range 0 to 131 072 Non integer arguments are rounded before execution Command Type Setting or Query Setting Syntax STAT QUES ENAB lt ws gt lt NRf gt Examples 5 5 2048 Query Syntax STAT QUES ENAB Response NR1 4 13 6 System Subsystem The SYSTem subsystem collects the functions that are not related to instrument performance The functions implemented in the AWG are security GPIB address changing error queue reading SCPI version reading and power on buffer setting not SCPI defined The command structure is as follows SYSTem COMMnunicate GPIB ADDRess lt numeric value gt ERRor VERSion SECurity STATe lt Boolean gt POBuffer lt numeric value gt 4 13 6 1 GPIB Address Change SYSTem COMMunicate GPIB ADDRess This command is used to set the GPIB address Arguments Type Numeric Range 0 to 31 Rounding to integer value Command Type Setting or Query Setting Syntax SYSTem COMMunicate GPIB ADDRess lt ws gt lt address gt IMINimumIMA Ximum Example SYST COMM GPIB ADDR 20 Query Syntax SYSTem COMMunicate GPIB ADDRess lt ws gt MINimum IMA Ximum Response lt address gt NR1 format Considerations 1 Setting the address to 31 puts the instrument in the off bus state 2 Using the MAX option se
39. IRD 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 8 Signal Connections Use 580 50 or equivalent coaxial cables for all input and output signals to and from the instrument 2 9 RS 232 Connection The rear panel RS 232 connector is a standard DB 9 male connector configured as a DCE The pin assignments are defined in the table below DB 9 pin Name Note 1 2 TXD Transmit Data 3 RXD Receive Data 4 2 5 GND Signal ground 6 7 5 Request to Send 8 CRS Clear to send 9 Note Use Null modem cross over cable 2 3 switched order to communicate with instrument When transmitting large files use only RS232 to RS232 female to female cables with no more than 50FT in length Baudrate of 9600 and 19200 are recommended values when configuring the interface 2 9 1 Communication Speed The 4075 4078 have capabilities of generating large arbitrary waveforms with up to 400 000 points Due to this nature the time it takes to transmit these large waveforms may vary depending on the baudrate and cable used for RS232 interface As a general reference provided below 15 a chart that shows the approximate amount of time it takes to download or send the wavefo
40. Programming 93 Performance Tests Results Setting Minimum reading Maximum reading Reading Frequency DDS 1 MHz 999980 Hz 1000020 Hz Frequency ARB 1 MHz 999950 Hz 1000050 Hz Sine Amplitude 10Vp p 3 499V 3 572V 5Vp p 1 749V 1 786V 3Vp p 1 049V 1 072V 1Vp p 0 349V 0 358V 100mVp p 34 mV 37 mV 50mVp p 17 mV 19 mV Square Amplitude 10Vp p 4 949V 5 051V 5Vp p 2 474V 2 526V 3Vp p 1 484V 1 516V 1Vp p 0 494V 0 51 100mVp p 49 mV 52 mV 50mVp p 24 mV 26 mV ARB Amplitude 10Vp p 3 499V 3 572V 5Vp p 1 749V 1 786V 3Vp p 1 049V 1 072V 1Vp p 0 349V 0 358V 100mVp p 34 mV 37 mV 50mVp p 17 mV 19 mV Offset Accuracy 4V 3 950V 4 050V 2V 1 970V 2 030V OV 10mV 10mV 2V 1 970V 2 030 4 3 950 4 050V Sine Distortion 1 KHz 65 dB Square Transition 1 MHz 12 ns Variable Duty Cycle 20 19 00 21 00 50 49 00 51 00 94 80 79 00 80 00 Yes No Operating Modes Triggered Burst External Trigger Sync Output Marker Output Reference Output External Modulation RS 232 95 V090810 BK PRECISION 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 2010 B amp K Precision Corporation 96
41. RST common command effects an instrument reset to the factory default power up state 4 9 Self Test The 5 common query causes the device to perform a self test This self test consists of checking the functionality of the arbitrary waveform memory 4 10 Command Syntax 4 10 1 General Command Structure The device commands are generally defined by the SCPI standard with the exception of those instrument functions for which SCPI commands do not as yet exist The Common Commands and Queries are defined by IEEE 488 2 The command syntax i e how a command is structured is defined by IEEE 488 2 A Program Message is defined as a string containing one or more Program Message Units each of which is an instrument command or query Program Message Units are separated from each other by the Program Message Unit Separator The Program Message is terminated by the Program Message Terminator The Program Message Unit Separator consists of a semicolon optionally preceded and or followed by whitespace characters A whitespace character is defined as the ASCII characters in the ranges 09 and OBH 20H This range includes the ASCII control characters and the space but excludes the Linefeed character The Program Message Terminator consists of optional whitespace characters followed by one of three options a The Linefeed LF character ASCII 0A b The GPIB EOI bus line being set true on the last byte of the message L
42. S When waveform generator is in a remote state REMS you control its operations from the controller settings update when GPIB are executed Remote With Lockout State RWLS When in a remote with lockout state RWLS the waveform generator operates much the same as it does in LOCS However when in RWLS the waveform generator ignores the rtl message locking out any changes made from the front panel 4 17 3 IEEE 488 2 Interface Function Subsets Standard 488 2 identifies the interface function repertoire of a device on the bus in terms of interface function subsets These subsets are defined in the standard Table C 1 lists the subsets that apply to the waveform generator NOTE For more information refer to IEEE Standard 488 2 The standard is published by the Institute of Electrical and Electronics Engineers Inc 345 East 47 Street New York New York 10017 Table C 1 Interface Function Subsets FUNCTION Source Handshake Acceptor Handshake Basic Talker Basic Listener Service Request Remote Local Parallel Poll Device Clear Device Trigger Controller Electrical Interface SUBSET 6 5 DC1 DT1 E2 CAPABILITY Complete capability Complete capability Responds to Serial Poll Untalk if My Listen Address MLA is received Unlisten if My Talk Address MTA is received Complete capability Complete capability including Local Lockout LLO Does n
43. Setting or Query Setting Syntax SOURce PRATe lt ws gt lt point rate gt units SOURce PRATe lt ws gt MINimum IMA Ximum Examples 500 5 Query Syntax ARBitrary PRATe lt ws gt MINimumIMA Ximum Response NR3 4 13 1 7 AM modulation The following sections control the AM modulation 4 13 1 7 1 AM STATe This command activates or deactivates AM modulation Arguments Type Boolean Command Type Setting or Query Setting Syntax SOURce AM STATe lt ws gt ONI1 OFFIO Examples SOURce AM STAT ON AM OFF Query Syntax SOURce AM STATe Response 4 13 1 7 2 DEPTh This command sets the AM modulation depth in Arguments Type Numeric Units none implied Range 0 to 100 Rounding to integer Command Type Setting or Query Setting Syntax SOURce AM DEPTh lt ws gt lt percent depth gt SOURce AM DEPTh lt ws gt MINimumIMA Ximum Examples AM DEPTh 50 Query Syntax AM DEPTh lt ws gt MINimum IMA Ximum Response NR3 4 13 1 7 3 AM SHAPe This command selects the AM modulating waveform shape Arguments Type Character Options SINusoid TRIangle SQUare Command Type Setting or Query Setting Syntax SOURce AM SHAPe lt ws gt lt SINITRIISQU gt Examples SOURce AM SHPE SIN AM SHAPE TRI Query Syntax SOURce AM SHAPe Response SINITRIISQU 4 13 1 7 4 AM FREQuency This command sets the AM modulating waveform frequency Arguments Type Numeric
44. Syntax STATus PRESet 4 13 5 2 Error Queue Read STATus QUEue This query returns the first entry in the error queue and removes that entry from the queue Its function is identical to that of SYSTem ERRor query Command Type Query only Query Syntax STATus QUEue NEXT Response lt Error number gt lt error description gt 4 13 5 3 Error Queue Enable STATus QUEue ENABle This command is used to enable individual errors to be placed in the queue when they occur Those errors not specified in the command are disabled from being reported in the error queue Errors and events enabled to be reported at power on depends on the Power on Status Clear status set with the PSC common command If PSC is set the status is cleared on power on and the range of errors enabled is as set by the STATus PRESet command ie 440 to 100 If PSC is cleared the status is not cleared on power on and the errors and events enabled are those that were enabled before last power down Type Expression The expression data takes the form NRfl lt event range gt NRfl lt event range gt where NRf represents an error number Entries are rounded to integer values An lt event range gt is defined as NRf NRf The first number in a range MUST be less than the second Up to 6 ranges may be specified using one ENABle command representing the 6 ranges of errors events The ranges are then separated from each other by Program D
45. Te lt point rate gt This command is used to set the point rate It is coupled with the frequency of the waveform by the relation Frequency 1 Point Rate Wavelength Thus changing the point rate will result in a change in frequency Arguments Type Numeric Units S mS uS nS Range 10nS to 100S Rounding to 4 digits Command Type Setting or Query Setting Syntax ARBitrary PRATe lt ws gt lt point rate gt units ARBitrary PRATe lt ws gt MINimum IMA Ximum Examples 100 5 Syntax ARBitrary PRATe lt ws gt MINimumIMA Ximum Response NR3 4 13 4 2 Address ARBitrary ADDRess lt address gt This command sets current address of waveform It is used to determine where arbitrary data to be written Use this command when querying data points using ARB DATA After generating data points Arguments Type Numeric Range 1 to 400 000 Rounding to integer value Command Type Setting or Query Setting Syntax ARBitrary ADDRess lt ws gt lt address gt ARBitrary ADDRess lt ws gt MINimumIMA Ximum Examples ARB ADDR 100 Query Syntax ARBitrary ADDRess lt ws gt MINimumIMA Ximum Response NRI 4 13 4 3 Data ARBitrary DATA lt data gt This command is used to set the values of the waveform Arguments Type Numeric Definite form arbitrary block Indefinite form arbitrary block Numeric Range 8191 to 8191 ASCII Rounding to integer value Binary Rang
46. a iaaa Pia daadaa da au painaa 6 2 10 RS 232 7 2211 gt naa sopa ade aaao duera dapu atd Adori 7 2 12 GPIB Connections 7 9 9 3 1 9 3 2 DIS PLY WVU OW ATE E 10 3 37 araa a 11 3 4 Back Panel Como SA 11 39 OUTPUT COE OOS ra a aa a a 12 3 6 MENU UK CVS 12 AE E E A E 28 3 8 Cursor Movement 28 SO Rotary Amb ssi 28 3 10 Power On 8 ae eaae danaa kaa aade denad iaaiaee paa 28 3 11 Mina es 29 3 12 ANE U ENEA 29 3 13 Using Model 4075 4
47. alse In order for the bit in the event register to be set the corresponding bit in the transition register must be set Bit 3 in the status byte will be set if a bit in the event register is set while the corresponding bit in the enable register is set 4 13 5 4 1 Questionable Condition STATus QUEstionable CONDition This query is used to read the condition register Command Type Query only Query Syntax STATus QUES COND Response NRI 4 13 5 4 2 Positive Transition Filter STAT QUES PTR This command is used to set and query the value of the positive transition filter Arguments Type NRf Range 0 to 131 072 Non integer arguments are rounded before execution Command Type Setting or Query Setting Syntax STAT QUES PTR lt ws gt lt NRf gt Examples STAT QUES PTR 2048 Query Syntax STAT QUES PTR Response NRI 4 13 5 4 3 Negative Transition Filter STAT QUES NTR This command is used to set and query the value of the negative transition filter Arguments Type NRf Range 0 to 131 072 Non integer arguments are rounded before execution Command Type Setting or Query Setting Syntax STAT QUES NTR lt ws gt lt NRf gt Examples STAT QUES NTR 2048 Query Syntax STAT QUES NTR Response NRI 4 13 5 4 4 Event Register STAT QUES EVENt This query is used to read the event register Reading the register clears it Command Type Query only Query Syntax STATus QUES EVEN Response NR
48. amplitude of that point of the waveform scaled to the instrument output amplitude Therefore a value of 8191 corresponds to positive peak amplitude 0 corresponds to the waveform offset and 8191 corresponds to the negative peak amplitude Edit Menu POINT This menu allows point by point waveform editing When selected the following menu is displayed Point Menu F1 ADRS Select the current address in the arbitrary waveform memory F2 DATA Selects the data point value at the current address You can change the point value from 8191 to 8191 F4 PREV Goes back to previous menu Edit menu F2 LINE This menu allows a line drawing between two selected points Displays the following menu FRO FREM TO CY ET Line Menu F1 FROM Selects starting point address F2 TO Selects the ending point address F4 EXEC Displays the Confirmation menu F1 NO and F3 YES Confirmation Menu PREDEF _ Predefined Waveforms Selects of the predefined waveforms Sine Triangle Square and Noise Displays the Predefined waveforms menu Freg 1 000 KHz SIME Predefine Menu Selects the waveform Sine Triangle Square Noise Ramp up Ramp down exponential Sin x x and Gaussian distribution If Noise function is selected a submenu is displayed to allow adding the noise to an available waveform or to generate it as a new noise waveform
49. and be sure to leave enough room for air to exhaust 10 GPIB Port Optional For connecting to PC using GPIB interface 3 5 Output connectors The waveform generator output circuits is protected against short circuit or nominal accidental voltages applied to the main output connector It operate as a 50 ohm voltage source working into a 50 ohms load At higher frequencies non terminated or improperly terminated output causes 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 cables and connectors 2 Make all connections tight and as short as possible 3 Use good quality attenuators if it is necessary to reduce waveform amplitudes applied to sensitive circuits 4 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 t
50. and sets the higher of the two frequencies used in FSK modulation Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Examples Response Numeric MHz KHz Hz default The whole frequency range of the current function The value is rounded to 4 digits Setting or Query SOURce FSK HIFrequency lt ws gt lt frequency gt units SOURce FSK HIFrequency lt ws gt MINimumIMA Ximum FSK HIFrequency 5KHZ FSK HIF 5E3 FSK HIF MAXIMUM FSK HIF MIN SOURce FSK HIFrequency lt ws gt MA Ximum IMINimum FSK HIF FSK HIF MAX NR3 4 13 1 9 4 FSK RATE This command sets the rate of switching between the two frequencies of the modulation Arguments Type Units Range Rounding Command Type Setting Syntax Numeric MHz KHz Hz default Fmax 1MHz Fmin 0 01Hz The value is rounded to 4 digits Setting or Query SOURce FSK RATE lt ws gt lt frequency gt units SOURce FSK RATE lt ws gt MINimumIMA Ximum Examples Query Syntax Examples Response FSK RATE 5KHZ FSK RATE 5E3 FSK RATE MAXIMUM FSK RATE MIN SOURce FSK RATE lt ws gt MAXimum IMINimum FSK RATE FSK RATE MAX NR3 4 13 1 9 5 FSK SOURce This command selects the FSK modulation source as either internal then the above settings are effective or external and then the external waveform determines the frequency of modulation Arguments Type Options
51. ary data read from the instrument in binary form as opposed to are returned in indefinite form Before sending your data enable all errors to be reported using STAT QUEUE ENABLE ALL Then if the arb data command causes an error the error message may be read from the queue using the query SYST ERR 4 17 GPIB Communication Protocol for models 4075GPIB amp 4078GPIB 4 17 1 General This appendix describes the effects of interface messages on waveform generator operation and uses abbreviations from the IEEE Standard 488 1 1987 4 17 2 Responses to IEEE 488 1 Interface Messages Interface messages and the effects of those messages on the instrument interface functions are defined in IEEE Standard 488 1 1987 Where appropriate the GPIB code is listed in decimal UNL Unlisten 63 with ATN UNT Untalk 95 with ATN UNL command places listener function to its idle unaddressed state In this idle state the waveform generator cannot accept commands from the GPIB The UNT command places the talker function to its idle state In this idle state the waveform generator cannot output data through the GPIB When the talker and listener functions are idle the front panel ADRS indicator is off If the waveform generator is talk addressed or listen addressed the ADRS indicator lights IFC Interface Clear Bus pin 9 The IFC message places both the listener and talk functions to idle states When the talker and l
52. ata Separators comma The entire expression must be enclosed in parentheses Command Type Setting or Query Setting Syntax STATus QUEue ENABle lt ws gt lt expression gt Example STAT QUE ENAB 440 410 258 220 402 110 Query Syntax STATus QUEue ENABle Response NRfl lt event range gt NRflevent range gt 4 13 5 4 Questionable Status The Questionable status data structure is used to alert the user to instrument conditions that affect the signal quality Two types of conditions are defined in the AWG and these are 1 Frequency Trigger rate conflict and 2 Output overload condition Each condition is reported separately for each channel Thus a total of four conditions may be reported The data structure is comprised of five 16 Bit registers Each bit represents a different status condition In the AWG bits 9 and 11 are used as follows Bit 9 Frequency trigger rate conflict Bit 11 Output overload The existence of these conditions is indicated in the CONDition register Bit 3 of the status byte is used to indicate the occurrence of a questionable status condition The conditions cause this bit to be set depending on the values of the other four registers The positive transition filter enables a bit in the event register to be set when a condition changes from false to true The negative transition register enables a bit in the event register to be set when a condition changes from true to f
53. aveform generator performs a diagnostic self test procedure to check itself for errors If it finds an error an error code and text will appear in the display window Other error codes appear when you enter an invalid front panel setting For more information on error codes see the Error Indication section 3 12 When the waveform generator finishes the diagnostic self test routine it enters the local state LOGS and assumes power on default settings Table 3 2 lists factory default settings You program waveform generator for any settings you want at power on as described earlier in section 3 6 6 Note OUTPUT status saved into memory cannot be recalled for power on setting This is a safety feature to prevent sensitive devices connected to the generator from being damaged if user accidentally turns on the unit Table 3 2 Power on Default Settings Key Functions Values Comments FREQUENCY 1 00000000 KHz Wave frequency RATE ARB lus Sample time per point AMPLITUDE 5 00 V Peak to peak output amplitude FUNCTION SINE Output waveform OFFSET 0 00 V Zero offset REPETITION 10 ms Internal trigger rate MODE CONT Waveform mode N BURST 2 Waves per burst START ADRS 1 Start memory address WAVELENGTH 1000 Number of points per waveform TRIG SOURCE EXT External trigger source OUTPUT OFF Output disabled SWEEP OFF Sweep execution MODULATION OFF Modulation execution 3 11 Memory
54. cations listed in manual are applicable after a powered 30 minute warm up Specifications are verified according to the performance check procedures Specifications not verified in the manual are either explanatory notes or general performance characteristics only Specifications and information is subject to change without notice For the most current and correct data please visit www bkprecision com Modulation Combinations SINE SQUARE TRIANGLE ARBITRARY AM Yes Yes Yes Yes FM Yes Yes Yes No FSK Yes Yes Yes No 2 Installation 2 1 Introduction This section contains installation information power requirements initial inspection and signal connections for Model 4075 and 4078 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 container 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 op
55. ccessible conductive parts including control knobs can render an electric shock The power jack and mating plug of the power cable meet IEC safety standards WARNING avoid electrical shock hazard disconnect power cord before removing covers Refer servicing to qualified personnel CAUTION 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 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 Table of Contents Safety sss 3 T 1 525655 1 Tal MOGUCOM ae ae ed eee ate aati cee 1 1 2 1 1 3 etna ede ina eee eas 1 1 4
56. commands to set the function frequency the point rate the wavelength and the waveform start address In ARB function setting the frequency or the point rate causes the other to change keeping the wavelength constant if it too is not specified in the same program message If the wavelength is specified as well the frequency or point rate must change in accordance with the new value The validity of the start address is a function of the wavelength Please refer to the individual commands for more detail The maximum frequency is also dependent upon the waveform so that changing the waveform may render the current frequency out of range c The commands to set modulation modulation source and the function are inter related FM and FSK are not available for ARB function External source of modulation can be active for either FM or AM but not both FSK and FM cannot be active at the same time d Sweep start and sweep stop frequencies must be distanced more than the minimum allowed for sweep to function correctly 4 6 Block Data GPIB Only Arbitrary waveform values may be sent to the device in one of three formats a ASCII values b Definite form arbitrary data and c Indefinite form arbitrary data 4 7 Instrument Identification The IDN common query is used to read the instrument s identification string The string returned is something similar to the following B amp K MODEL 4078 0 V 1 03 4 8 Instrument Reset The
57. ct ALL Protects the whole waveform memory Equivalent to selecting from 1 to 400 000 Note You can protect only one segment of waveform memory at a time F4 ON OFF Selects the unprotect mode and resets memory protection so that the whole waveform memory can be written into 3 6 5 PULSE Menu Freq 1 000 KHz Ampls 00 Vo 0 00 4 PULSE F2 PULSE Selects the Pulse parameters entry And then F1 FREQ PERIOD Selects the parameter definition of the Pulse repetition period F2 WIDTH Selects the Width of the generated pulse EQUAL EDGE Selects equal Rise Leading edge and Fall Trailing edge times of the pulse F4 LEAD TRAIL Selects different Rise and Fall times of the Pulse 3 6 6 UTILITY Key RECALL 0 Default Setup ea PEET Utility Menu F1 GPIB optional Selects the GPIB remote mode of operation After selection the GPIB address can be set to any value from 1 to 31 using the rotary knob The value is kept in a nonvolatile memory and used at power on The factory default address is 9 Setting the address to 31 puts the device in the off bus state it will not respond to messages on the GPIB bus F1 RS232 Selects the RS232 remote control mode After selection the baud rate can be selected as 2400 9600 and 19200 The RS 232 uses 8 bit data 1 stop bit and no parity F2 RECALL Recalls a previously stored front pa
58. d by IEEE 488 2 Definite Form The Definite Form has the structure Byte Count Length Byte Count 8 bit byte The Byte Count Length consists of a single ASCII digit from 1 to 9 It tells the parser how many digits in the Byte Count The Byte Count is a decimal integer made up of the number of digits specified in the Byte Count Length It tells the parser how many 8 bit bytes are being sent Indefinite Form The Indefinite Form has the structure 0 8 bit byte LF EOI Some Program Message Units either require or can accept more than one data element Program data elements are separated from each other by the Program Data Separator It is defined as optional whitespace characters followed by a comma which in turn is followed by optional whitespace characters There are two types of Program Message Units Command Message Units and Query Message Units A Query differs from a Command in that the Program Header is terminated with a question mark For example the frequency might be queried with the following query FREQ Some Query Message Units accept data giving the device more specific information about what is being queried In many cases the Query Message Unit may optionally be supplied with the MIN or MAX mnemonics as data This tells the device to return the minimum or maximum value to which the parameter may currently be set For example FREQ MAX will return the maximum value to which the f
59. e 8191to 8191 Example to set a data value to zero send the Hex bytes 0000 The definite form lt preamble gt consists of two fields The first is a single byte representing the number of digits in the byte count The byte count is the second field in the preamble and consists of decimal bytes 0 9 which when taken together give the byte count Example of definite form sending values 0 1 2 decimal 16 xO xO xO x 1 x0 x2 means that the byte count consists of 1 byte only and the number of bytes is 6 Note refers to Hexadecimal The indefinite form preamble consists of a 0 character alone Example of indefinite form same data as above gt 0 xO xO xO x IAxO x2 x0A Since it does not contain a byte count the indefinite form command must be terminated with EOI if using GPIB or CR and or LF when using RS232 interface Note x0A is the hexadecimal value for LF Since each arbitrary data point consists of two bytes an even number of bytes must be sent In the following examples the data is specified in Hex format with each byte being preceded by x in order to show this Example of definite form 16 x8 xO x8 x 1 8 2 byte count consists of one byte only and value is 6 Example to definite form ARB DATA 0 x8 x0 x8 x I x8 x2 x0A The represents Linefeed character EOI must be sent with this character Arbitr
60. e 001H to 3FFFH BINARY Command Type Setting or Query Setting Syntax Numeric ARBitrary DATA lt ws gt lt numeric gt lt numeric gt Example ARB DATA 100 200 1000 2000 2000 Arbitrary Block ARBitrary DATA lt ws gt lt arb block data gt Refer to section 4 16 Examples Definite Form ARB DATA 14 x8 x64 x8 xC8 indicates that the values are Hexadecimal Indefinite ARB DATA 0 x8 x64 x8 xc8 xa EOI Query Syntax ARBitrary DATA lt ws gt lt number of points gt BINarylASCii Note The lt number of points gt that the query returns starts from the current address For example if lt number of points gt is set as 5 and address is 1000 it will return data point values in address 1000 1001 1002 1003 and 1004 The address will then point to 1005 after the query Response Using the BINary option data are returned in the Indefinite arbitrary block form Using the ASCii option data are returned in the decimal numeric form Considerations Data cannot be written to protected memory In binary form each data point consists of two bytes The high byte must precede the low byte When using ARB DATA to generate data points the address will increment based on the number of points set For example suppose the current address is 1 The command ARB DATA 100 200 300 is sent The address becomes 4 after this command To query these data points immediately using ARB DATA command as described above the address must be re
61. e Amplitude or the Offset parameters In Arbitrary mode this setting defines the maximum peak to peak amplitude of a full scale waveform If the waveform does not use the full scale of data 8191 to 8191 then its actual amplitude will be smaller Setting the Amplitude The following equation represents the relative output amplitude voltage relationship between the front panel amplitude peak to peak setting and the data point values in waveform memory output voltage Amplitude setting points value 16382 offset Where 16382 is the total data point value range in waveform memory Examples Front amel Data Point Relative Output Amplitude Amplitude Voltage Setting 5 Vp p 8191 2 5 V 5 Vp p 4095 1 25 5 0 OV offset voltage 9 Vp p 4095 4 5 V 4 Vp p 8191 2 V Selects the Offset parameter Change the offset by using the cursor keys rotary dial or F2 SYM numerical keypad If a certain setting cannot be produced the waveform generator will display a Setting Conflict message When the Square or Triangle waveforms are selected the SYMMETRY option is available Change the symmetry by using the cursor keys rotary dial or numerical keypad If a certain setting cannot be produced the waveform generator will display a warning message 1 000 000 000 KHz Ampls 00 W Ofat 0 00 1 Trian
62. e Source Subsystem controls the frequency voltage amplitude modulation and clock source The command structure is as follows SOURce FREQuency CWl FIXed lt numeric value gt PRATe lt numeric value gt FUNCtion SHAPe SINusoidISQUarelTRIanglellARBitrarylIPULSe DCYCle lt numeric value gt VOLTage AC LEVel AMPLitude lt numeric value gt OFFSet lt numeric value gt REFerence SOURCE INTernal IEXTernal STATe lt Boolean gt DEPTh lt numeric value gt SINusoid SQUarelTRIangle FREQuency lt numeric value gt SOURce INTernal IEXTernal STATe lt Boolean gt DEViation lt numeric value gt SHAPe SINusoid SQUarelTRIangle lt numeric value gt SOURce INTermal IEXTernal STATe lt Boolean gt LOWFrequency lt numeric value gt HIFrequency lt numeric value gt RATE lt numeric value gt SOURce INTernal IEXTernal SWEep STATe lt Boolean gt 5 lt LINILOG gt TIME lt numeric value gt STARt lt numeric value gt STOP lt numeric value gt PHAse ADjust lt numeric value gt PULSe PERiod lt numeric value gt WIDth lt numeric value gt EDGe lt numeric value gt RISe lt numeric value gt FALI lt numeric value gt Note For model 4078 nothing changes in the commands above to control channel 1 But for channel 2 change SOURce to SOUR2 For example to change chan
63. e total data point value range in waveform memory Table 3 4 Relative Amplitude for Waveform Output Examples Front Panel Data Point Value Relative Output Amplitude Setting Amplitude Voltage 5 V peak to peak 8191 2 5 V positive peak 5 V peak to peak 0 0 V offset voltage 10 V peak to peak 8191 5 V positive peak 3 14 5 Executing an Arbitrary Waveform To load a waveform into execution memory specify its starting address and length in the ARB menu 1 Select the channel to ON Press the ARB key and select the F2 ARB function 3 Press 1 5 to set the address Valid entries range from 1 to 399 999 Note The starting address always has to be an odd number If an even number is entered it will automatically decrement one value to an odd number For example if you set start address to 2000 and press ENTER it will display 1999 4 Press F2 LENGTH to set the length of the waveform Use the rotary input knob or the numerical keypad to enter the waveform length Valid entries range from 2 to 400 000 A Note The length value must always be an even number If you input an odd number length a message will pop up and say Even wave length and then decrement one value to an even number For example if you entered 1001 as the length the message will pop up for one second and change the value automatically to 1000 3 14 6 Using Voltage Offset Through the offset parameter you can add a positive
64. e unit to generate an Arbitrary waveform with Marker Press the ARB key 92 Select F2 ARB Select EDIT Select PREDEF Select F2 FROM press key 1 and ENTER Select F2 DATA press key 0 and ENTER Select 4 EXEC Select YES Select ARB Select F2 ARB Select MARK Select 7 CHECK for a pulse with a 1us width and with OV and gt 4V levels on the oscilloscope 5 3 8 External Modulation Specification 5 Vp p for 100 AM modulation Procedure 4 Connect the OUTPUT connector to the oscilloscope input using a 50 ohm coaxial cable 50 ohm feedthrough termination 5 Set the unit to generate a SINE waveform with 1 KHz frequency and 5 Vp p output 6 Connect the external function generator to the MODULATION IN of the unit Use a coax cable with 50 ohm feedthrough termination 4 Set the external function generator for a sine wave output with 400 Hz frequency and 3Vp p output On the unit select MODUL and then F1 AM again F1 ON and then F4 EXT CHECK on the oscilloscope for an amplitude modulated waveform that is changing the modulation depth by changing the external generator output amplitude 5 3 10 RS232 Capability 1 Connect the waveform generator to a computer with RS232 capabilities 4 Select RS232 remote operation mode on the UTIL menu and 19200 baud rate For more information on RS232 programming see the Operation Manual Section 4
65. ean gt This command is used to enable or disable the marker Arguments Type Boolean Command Type Setting or Query Setting Syntax ARBitrary MARKer STATe lt ws gt ON OFF or 1 1 0 0 Query Syntax ARBitrary MARKer STATe Response 01 4 13 4 15 Save ARBitrary SAVe This command is used to save all unsaved arbitrary waveform data into non volatile memory Arguments Type none Command Type Setting only Setting Syntax ARBitrary SAVe 4 13 5 Status Subsystem This subsystem controls SCPI defined status reporting structures which the QUEStionable and OPERation status registers and the error event queue The OPERation status registers are mandated by SCPI and so are implemented but are not used by the hardware No status is ever reported through them and they are not detailed in this manual The following shows STATus structure used STATus PRESet QUEue NEXT QUEStionable CONDition PTRansition lt NRf gt NTRansition lt NRf gt lt NRf gt 4 13 5 1 Status Preset STATus PRESet This command is used to set certain status values to defined values a The OPERation and QUEstionable enable registers are cleared b The Positive transition filters are set to 32767 c The Negative transition filters are set to 0 d Only errors in the range 440 100 are enabled to be reported in the event queue Command Type Setting only Setting
66. ecifications and characteristics 1 2 Description The Model 4075 and 4078 are versatile high performance arbitrary waveform generators Arbitrary waveforms can be programmed and generated with 14 bit resolution and up to 400 000 points length Waveforms can be output in continuous triggered gated or burst mode AM and FM modulation combined with versatile Sweep capabilities make the unit suitable for a wide range of applications Editing is flexible and easy including auto increment line draw and predefined waveform facilities The instrument can be remotely operated via the RS232 or an optional GPIB interface order models 4075GPIB or 4078GPIB and they are SCPI compatible 1 3 Memory Architecture The waveform memory consists of 400 000 points The user can edit arbitrary waveforms in waveform memory and can specify any data value in the range from 8191 to 8191 for any point in waveform memory 14 bit depth Due to their large memory bank the 4075 and 4078 can essentially give the user greater freedom in selecting the size of their waveforms and the number of waves they desire to generate with the limit of 400 000 total points when added together For example these generators can create a waveform with 10 000 points another waveform with 50 000 points a third waveform with 40 000 points and a fourth waveform with 300 000 points These four waveforms total up to 400 000 points but essentially they can be referenced in the memory bank acco
67. ecution Error EXE This bit is set when the device could not execute a command due to the command being outside of its capabilities For example a parameter being out of range Bit 5 Command Error CME This bit is set to indicate an error in the command syntax Bit6 User Request This bit is not used Bit 7 Power On PON This bit is set when the device is powered on The SESR is queried using the ESR common query The SESR is paired with an enable register the Standard Event Status Enable Register SESER This register enables one or more events in the SESR to be reflected in the Status Byte ESB summary message bit The bits of the SESER correspond to those of the SESR Setting a bit in the SESER enables the corresponding event to set the ESB bit when it occurs The SESER is set with common command and queried with the ESE command query 4 11 4 The Error Queue The error queue is used to store codes of errors detected in the device It is implemented as a cyclic buffer of length 10 When the error queue is not empty bit EVQ in the Status Byte is set The error queue is read with either one of the following two queries SYSTEM ERROR STATUS QUEUE NEXT The first error in the queue is returned and the queue is advanced 4 11 5 Error Codes The negative error codes are defined by SCPI Positive codes are specific to the instrument The error message is returned in form lt error number g
68. ed to and from the function generator For CH2 Model G 2 G 4 9 10 4078 only Figure 3 3 Back Panel View 1 Modulation In 5 Vp p signal for 100 modulation 10Kohms input impedance with DC gt 20 KHz bandwidth This connector can be used for modulating external signals in AM and FM modulation Trig In Use this connector to apply an external trigger or gate signal depending on the waveform generator setting to generator This connector is also used when using external signal to generate FSK under modulation menu See section 3 6 8 for details 3 Marker Out Use this connector to output a positive TTL pulse in Arbitrary waveform mode The Marker position and width can be programmed at any desired Arbitrary locations See section 3 6 3 for details 4 Syne Out Use this connector to generate a positive TTL sync pulse output at each waveform cycle 5 RefIn Out Use this connector to input a 10 MHz TTL signal to be used as reference clock for the unit signal generation 1OMHz TTL level signal is available for synchronization of external units when not in External Reference mode 6 5 232 Port Used to connect to PC via serial cable for RS 232 serial interface and programming 7 Power Connector Used to connect power cable to AC line source 8 Fuse Box Fuse compartment to check or replace fuse 9 Rear Rear fan for internal cooling and ventilation Do not block this area
69. ed voltages on the DVM at 10Vp p 5Vp p 3Vp p 1Vp p 100 mVp p and 50mVp p are in the accuracy range Amplitude Minimumreading Maximum reading RMS DVM reading RMS setting RMS 10Vp p 3 499V 3 572V 5Vp p 1 749V 1 786V 3Vp p 1 049V 1 072V 1Vp p 0 349V 0 358V 100mVp p 34 37 mV 50mVp p 17 19 5 3 3 Offset Accuracy Specification 1 of programmed value 10mV into 50 ohm Procedure 1 Connect the OUTPUT connector to the input of the DVM using 50 ohm coaxial cable and the 50 ohm 0 1 termination Set the DVM to measure DC volts Set the unit to generate a SINE wave signal with 1 KHz frequency Set the unit amplitude to 10mVp p 4 Set the unit offset 4V 7 CHECK the measured voltages on the DVM at offsets of 4Vp p 2Vp p OVp p 2Vp p 4Vp p are in the accuracy range Offset Minimum reading Maximum reading DVM reading setting 4V 3 950V 4 050V 2V 1 970V 2 030V OV 10 10mV 2V 1 970V 2 030 4 3 950 4 050V 5 3 4 Sine Distortion Specification 65 dB to 20 KHz Procedure 90 7 13 Connect the OUTPUT connector to the distortion analyzer using 50 ohm coaxial cable and a 50 ohm feedthrough termination 7 14 Set the unit to generate a sine waveform with 1KHz frequency and 10Vp p 7 15 Set the distortion analyzer to measure distortion in dB and select RMS response 7 16 CHECK for a reading
70. eep STARt This command sets the start frequency of the sweep Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Examples Numeric MHz KHz Hz default Dependent on the frequency range of the current function The value is rounded to 4 digits Setting or Query SOURce SWEEP STARt lt ws gt lt frequency gt units SOURce SWEEP STARt lt ws gt MINimumIMAXimum SWEEP STARt 5KHZ SWEEP STARt 5E3 SWEEP STARt MAXIMUM SWEEP STARt MIN SOURce SWEEP STARt lt ws gt MA XimumIMINimum SWEEP STARt SWEEP STARt MAX Response NR3 4 13 1 10 5 Sweep STOP This command sets the stop frequency of the sweep Arguments Type Units Range Rounding Command Type Setting Syntax Examples Numeric MHz KHz Hz default Dependent on the frequency range of the current function The value is rounded to 4 digits Setting or Query SOURce SWEEP STOP lt ws gt lt frequency gt units SOURce SWEEP STOP lt ws gt MINimumIMAXimum SWEEP STOP 5KHZ SWEEP STOP 5E3 SWEEP STOP MAXIMUM SWEEP STOP MIN Query Syntax Examples Response 4 13 1 11 SOURce SWEEP STOP lt ws gt MA XimumIMINimum SWEEP STOP SWEEP STOP MAX NR3 PHASe adjust This command controls the phase adjustment Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Numeric one degrees implied 180 to
71. equency and the amplitude SOURCE FREQUENCY 2KHZ VOLTAGE AMPLITUDE 4V The FREQUENCY and VOLTAGE mnemonics are at the same level c When Program Message Units describe different subsystems a colon prefix must be used to reset the command reference to the root Here the frequency and the output state are set SOURCE FREQUENCY 3KHZ OUTPUT STATE ON 4 11 Common Commands be inserted in Program Message without affecting instrument control command reference For example SOURCE VOLTAGE AMPLITUDE 4V ESE 255 OFFSET 2V FOR MODEL 4078 ONLY Exclusively for the model 4078 with multiple channels the selection of which channel to use is achieved through the use of a numeric suffix indicating the channel attached to the root level mnemonic Four root level mnemonics are channel dependent and these are SOURce TRIGger OUTPut and ARBitrary When the channel is not specified channel 1 is assumed by default Program message units that are referred back to a specific root level mnemonic operate on the channel specified in that mnemonic Examples a SOUR FREQ 5KHZ VOLT AMPL Sets the frequency and amplitude of the first channel default b SOUR2 FREQ 5KHZ VOLT AMPL Sets the frequency and amplitude of channel 2 c ARB2 START 100 LENGTH 50 Sets the start address and length of the waveform being output on channel 2 Status Reporting The instrument is capable of reporting status events and errors to the controller
72. er source Change internal trigger rate displayed with the rotary input knob EXT Selects the external trigger signal as the trigger source The trigger source is supplied through the TRIG IN connector F4 NBRST Selects the number of burst pulses to be output with each trigger The N can be changed from 2 to 999 999 3 6 3 ARBITRARY Key When selected displays the following screen F1 FREQ RATE 5 00 5 Ofst i 00 Arbitrary Menu Frequency Selects and displays the frequency Change the frequency setting using the cursor keys rotary knob or numerical keys If a certain wavelength can t produce the waveform at the desired frequency the waveform generator displays an Out of Range error message Displays the Point Rate for Arbitrary Waveform only The Rate parameter governs the rate at which waveform points are executed and thus the frequency of the waveform output When you set this parameter the waveform generator will keep that execution rate for all waveform lengths until it is changed F2 ARB Selects the Arbitrary editing menu START 1 SE EDIT LEMA Arbitrary Editing Menu F1 START LENGTH Selects the starting address of the arbitrary waveform Note The starting address always has to be an odd number If an even number is entered it will automatically decrement one value to an odd number For example if you set start address to 20
73. es Display Displays the values of parameters selected in the menu Depending on the options chosen various parameters will display with a cursor for adjusting their values 6 Displays current mode selected The be continuous trigger burst or gate displayed as CONT TRI BURST or GATE respectively Refer to section 3 6 2 for details 3 3 Front Panel Controls The front panel controls select display and change parameter function and mode settings They also include the keys you use to program and generate arbitrary waveform output Refer to Figure 3 1 Use the rotary input knob and the cursor movement keys to enter data into the waveform generator To change a setting 1 Press any FUNCTION keys F4 that lead 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 or the numerical KEYPAD to change the value of the displayed item Changes take effect immediately In some parameter settings the ENTER key must be pressed in order to set their numerical setting values Otherwise it may not save 3 4 Back Panel Controls The function generator has nine five for model 4075 BNC Connectors on the rear panel where you can connect coaxial cables These coaxial connectors are labeled accordingly on the back panel for their respective channels and serve as carrier lines for input and output signals deliver
74. gle Menu F4 INTREF EXTREF Selects internal or external reference source for the generated standard waveforms the external reference must be connected to the rear panel Ref In connector 3 6 2 MODE Key Selects the output mode CONT Continuous TRIG Triggered GATE Gated and BRST Burst To select the output mode press MODE then press the function key that corresponds to the desired Mode menu option as shown Freq 1 000 KHz MODE CONT Mode Menu F1 CONT Continuous Selects continuous output F2 TRIG BRST Triggered Triggers one output cycle of the selected waveform for each trigger event Burst Triggers output N cycles for each trigger event where N ranges from 2 to 999 999 Gated Triggers output cycles as long as the trigger source asserts the gate signal F4 PHASE Selects the start phase of the signal in non continuous modes The range is from 360 to 360 with 0 17 resolution In PHASE mode F2 SET ZERO sets the phase reference to zero when few instruments are connected to the same external reference and need to be synchronized with different phase relations After selecting the TRIG GATE or BURST menu the trigger source menu is available Freq 1 000 KHz TRIG EXTERMAL Trigger Menu F1 MAN Selects manual as the trigger source To trigger the waveform generator press this MAN TRIG again F2 INT Selects the internal trigger generator as the trigg
75. he 1 MQ input impedance paralleled by a stated capacitance of an oscilloscope vertical input connect the transmission line to a 50 Q attenuator a 50 termination and to the oscilloscope input The attenuator isolates the input capacitance of the device and terminates the waveform generator properly 3 6 MENU Keys These keys select the main menus for displaying or changing a parameter function or mode Below is the hierarchy and selections of the menu tree MENU TREE SINE o FREQ o AMPLIOFST o RAMP MODE SYM AMPL OFST INTREF EXTREF FREQ SYM AMPL OFST INTREF EXTREF FREQ PULSE FREQ PERIOD WIDTH EQUAL EDGE LEAD TRAIL AMPL OFST INTCLK EXTCLK FREQ RATE ARB START LENGTH SAVE ADDR e LENGTH e ON OFF e PREV EDIT POINT ADRS e LINE FROM NO I YES PREDEF FROM DATA LENGTH SCALE NO I YES o COPY LENGTH NO I YES FROM NO YES ON OFF SHOW WAVE CONT TRIG BURST INT TRIG RATE NBRST INT o PHASE not available in ARB mode PH
76. ical mode the auto increment address advances the A value by 3 14 3 Setting the Arbitrary Frequency The arbitrary waveform frequency is a function of the number of data points used to run the waveform the length parameter in the ARB menu and the waveform execution point rate The waveform execution point rate is the execution time between each point in the waveform The total time taken to run one period of the waveform is given by Total time of points rate Because the output frequency is a function of the rate and the number of points being executed the output frequency is calculated as 1 of points rate For example to set the output frequency to 1000 Hz given the number of data points used for the waveform output is 1000 the rate is calculated as 1 1000 pts 1000 Hz 2 rate EXAMPLE Setting the Output Frequency To set the output frequency of a 1000 point waveform in execution memory to 1000 Hz set the rate to us ACTION KEYSTROKES Step 1 Set the output rate to 1 us equivalent to PARAMETER 1000 Hz output frequency Fl 1 KHz us 3 14 4 Setting the Amplitude The following equation represents the relative output amplitude voltage relationship between the front panel amplitude peak to peak setting and the data point values in waveform memory Amplitude p p setting data point value 16382 of fset output voltage Where 16382 is th
77. iguration memory lost Device memory has been lost 330 Self test failed 350 Queue overflow Error codes have been lost due to more than 10 errors being reported without being read Query Errors A query error indicates that the output queue control has detected a problem This could occur if either an attempt was made to read data from the instrument if none was available or when data were lost Data could be lost when a query causes data to be formatted for the controller to be read and the controller sends more commands without reading the data 410 Query INTERRUPTED Data were sent before the entire response of a previous query was read 420 Query UNTERMINATED An attempt was made to read a response before the complete program message meant to generate that response was sent 430 Query DEADLOCKED The input buffer and output queue are full and the controller is attempting to send more data In this case the output queue and input buffers will be cleared Parsing will resume after the END message is detected 440 Query UNTERMINATED after indefinite response A query was received in the same program message after a query requiring an indefinite response was formatted Essentially this means that the common query and the ARB DATA query should not be followed by more query messages in the same program message System Events System events have positive valued codes They are not defined by SCPI but are specific to
78. istener functions are idle the front panel ADRS indicator is off The IFC pulse is gt 100us DCL Device Clear 20 with ATN The Device Clear message resets GPIB communication That is the DCL message clears all input and output messages as well as all unexecuted settings SDC Selected Device Clear 4 with ATN The SDC message causes the same response as the DCL message However the waveform generator only responds if it is listen addressed GET Group Execute Trigger 8 with ATN The waveform generator responds to the Group Execute Trigger message only if it is listening addressed and the device trigger function is enabled The TRIGger MODE must be in TRIG CONTinuous BURst and the TRIGger SOURce must be set to BUS to enable device triggering GET SPE Serial Poll Enable 24 with ATN The SPE message generates output serial poll status bytes when talk addressed SPD Serial Poll Disable 25 with ATN The SPD message switches back to generating output data from the Output Buffer MLA My Listen Address GPIB Address 32 MTA My Talk Address GPIB Address 64 The instrument GPIB primary address establishes the listen and talk addresses To see the current GPIB primary address press SPECIAL and then F1 SYS on the front panel When the waveform generator is talk addressed listen addressed the front panel ADRS indicator lights LLO Local Lockout 17 with ATN When the waveform generator is listening addressed
79. ix 011 0049 02 Tektronix 012 0482 XX 5 3 Performance Tests The following tests verify that the waveform generator operates and meets specifications Perform the tests after a warm up period of 30 minutes at an ambient temperature of 22 C 3 You can use these tests for periodic inspection and for inspection after repair NOTE In the following procedures all test conditions for the waveform generator are power up conditions with output ON unless otherwise specified 5 3 1 Frequency Accuracy Specification 0 002 20ppm for the DDS waveforms 0 005 for the Arbitrary waveforms Procedure 1 Connect the OUTPUT connector to the counter input using 50 ohm coaxial cable and a 50 ohm feedthrough termination 2 Select SQUARE to generate a square waveform with 1MHz frequency and 5Vp p 3 Set the counter to measure frequency with maximum digits resolution 4 CHECK for a frequency reading between 999980 Hz and 1000020 Hz 5 Select ARB waveform Press F1 RATE and enter 1 us 4 Connect the unit REF OUT connector on the rear panel of the unit to the counter using the coax cable and 50 ohms termination 5 CHECK for a frequency reading between 999950 Hz 1000050 Hz 5 3 2 Amplitude Accuracy Specification 1 0 10mV of programmed value into a 50 ohms termination for a waveform frequency of 1KHz Procedure 1 Connect the OUTPUT connector to the input of the TRUE RMS DVM using a 50 ohm coaxial cable and
80. lect any other value in the range from 1 to 49 to have the waveform generator power on with the settings that you have saved with F2 STORE see above in the range of 1 to 49 Note Channel output status can be stored and recalled in memory but cannot be recalled for power on setting Meaning at any given time at power on the channel output status will always be OFF regardless of what memory block power on setting is set to recall at power up This is a safety feature because if user accidentally turns on with the outputs on sometimes it can easily damage a connected device that is sensitive to signal levels connected to it 3 6 7 SWEEP Key Selects the Sweep Mode and allows the entering of sweep parameters as Sweep Start Sweep Stop and Sweep Rate To select the sweep mode press SWEEP then press the function key that corresponds to the desired Sweep menu option as shown Freg LIN SWEEP SWEEP START 1 000 KHz ATE ele Sweep Menu F1 ON OFF Operates the sweep function selecting between Sweep On or Off F2 START STOP Defines the Sweep Start and Stop frequencies F3 RATE Defines the Sweep Rate F4 LIN LOG Selects the Sweep Shape LIN or LOG SHY Freg LOG SWEEP SWEEF AATE 100 mS fy Low Log Sweep Menu 3 6 7 1 How to Setup Sweep in Different Modes By default turning ON the sweep function will automatically set to a continuous CONT sweep In order t
81. m 10mV to 999mV 10 from 1V to 10V Command Type Setting or Query Setting Syntax SOURce VOLTage AMPLitude lt ws gt lt amplitude gt units SOURce VOLTage AMPLitude lt ws gt MINimumIMAXimum Examples VOLT AMPL 2 5 VOLT AMPL 2 5V VOLT AMPL Query Syntax SOURce VOLTage AMPLitude lt ws gt MINimum IMA Ximum Examples VOLT AMPL VOLT AMPL MAX Response NR2 Considerations 1 The MAXimum amplitude is dependent on the offset 2 The MAX and MIN arguments should not be used in a program message containing an OFFSet command since these values are evaluated during parsing based on the current value of the offset 4 13 1 3 Offset SOURce VOLTage OFFSet lt offset gt The offset command is used to set the DC offset of the output waveform Note that the amplitude and the offset are limited by the relation Peak Amplitude lOffsetl lt 5V Arguments Type Numeric Units V mV Range 10mV to 4 99V Rounding to 10 Command Type Setting or Query Setting Syntax SOURce VOLTage OFFSet lt ws gt lt offset gt units SOURce VOLTage OFFSet lt ws gt MINimumIMA Ximum Examples VOLT OFFS 2 5 VOLT OFFS 2 5V VOLT OFFS Query Syntax SOURce VOLTage OFFSet lt ws gt MINimumIMAXimum Examples VOLT OFFS VOLT OFFS Response NR2 Considerations 1 The MAXimum offset is dependent on the amplitude 2 The MAX and MIN arguments should not be used in a program message containing a
82. moved by operating 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 B amp K Precision 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 not alter the ground connection Without the protective ground connection all a
83. n AMPLitude command since these values are evaluated during parsing based on the current value of the amplitude 4 13 1 4 Clock Reference Source SOURce REFerence SOURce lt clock source gt This command is used to select the source of the arbitrary waveform clock This clock sets the arbitrary waveform point rate Arguments Type Character Options INTernal EXTernal Command Type Setting or Query Setting Syntax SOURce REFerence SOURce lt ws gt lt option gt Examples REF SOUR INT REF SOUR EXT Query Syntax SOURce REFerence SOURce Response INTIEXT 4 13 1 5 Function SOURce FUNCtion SHAPe The function command is used to set the type of waveform to be generated by the instrument Command Type Setting or Query Setting Syntax SOURce FUNCtion SHAPe lt WS gt lt OPTION gt Examples FUNC SIN FUNC ARB Query SOURce FUNCtion SHAPe Examples FUNC Response SINITRISQUIARBIPUL Considerations The following functions are available Sinusoid Square TRIangle ARBitrary 4 13 1 6 Point Rate SOURce PRATe lt point rate gt This command is used to set the point rate It is coupled with the frequency of the waveform by the relation Frequency 1 Point Rate Wavelength Thus changing the point rate will result in a change in frequency Arguments Type Numeric Units S mS uS nS Range 10nS to 100S Rounding To 4 digits Command Type
84. nel 2 to SINE function send the command SOUR2 FUNC SIN 4 13 1 1 Frequency SOURce FREQuency lt frequency gt The frequency command controls the frequency of the output waveform Arguments Type Numeric Units MHz KHz Hz default Range Dependent on the Point Rate and Wavelength Fmax 1 10nS Wavelength Fmin 1 100S Wavelength Rounding value is rounded to 4 digits Command Type Setting or Query Setting Syntax SOURce FREQuency CW lt ws gt lt frequency gt units SOURce FREQuency lt ws gt MINimumIMA Ximum Examples FREQ 5KHZ 5E3 FREQ MAXIMUM MIN Query Syntax SOURce FREQuency CW lt ws gt MA Ximum IMINimum Examples FREQ Response Considerations 1 The MIN MAX arguments should be used only in a Program Message that does NOT contain Program Message Units specifying Arbitrary Point Rate or Wavelength since the MAXimum or MINimum value is calculated at the time the command is parsed 2 The MIN and MAX arguments refer to currently settable minimum or maximum 3 is alias for CW 4 13 1 2 Amplitude SOURce VOLTage AMPLitude lt p p amplitude gt The amplitude command is used to set the peak to peak amplitude of the output waveform Note that the amplitude and the offset are limited by the relation Peak Amplitude lOffsetl lt 5V Arguments Type Numeric Units mV Range 10mV to 10V Rounding ImV fro
85. nel setup from the selected buffer Change the buffer number by using the rotary input knob Valid storage buffer numbers are from 0 to 49 Buffer 0 is the factory default setup F2 STORE Stores the current front panel setup to the specified storage buffer Change the buffer number by using the numeric keypad or the rotary input knob Valid storage buffer numbers range from to 49 Below is a list of parameters that can be stored in each buffer Note Location 50 is for last working setup before power down List of Stored Parameters Stored Parameters FREQUENCY RATE ARB AMPLITUDE FUNCTION OFFSET REPETITION MODE N BURST START ADRS WAVELENGTH TRIG SOURCE OUTPUT SWEEP MODULATION For power on setting channel output status is not saved and cannot be recalled For example if channel output is ON when storing into memory it cannot be recalled when that memory is set for power on setting In which case at power on status of the channel output will always be disabled This is for safety reasons because in some cases if device connected to the generator is sensitive to signal level accidentally powering the instrument ON with the output on may damage the device right away The RECALL and STORE function can be used as a tool to store and locate many arbitrary waveforms Because the 4075 and 4078 are designed with one large memory bank up to 400 000 Waveform 1 points of st
86. nes between data points Create a predefined waveform Export waveform from software Create data points using SCPI commands Combine any of these methods The waveform s frequency and amplitude are influenced number of data points their value in waveform For further information on how the number of data points influence the frequency and amplitude of a waveform in execution memory see Setting the Frequency portion Section 3 14 3 and Setting the Amplitude portion Section 3 14 4 respectively 3 14 2 Entering Individual Data Points The most basic way to program an arbitrary waveform is to enter data points for the waveform one data point at a time While this can become tedious the auto increment function helps this process To enter individual data points into waveform memory follow these steps Press ARB main key to display the selection menu Press F2 ARB to display the arbitrary menu Press F4 EDIT to display the Edit menu Press F1 POINT to select the point by point programming mode Press F1 ADRS Use the rotary knob or the numerical keypad to enter the address Press F2 DATA Use the rotary knob or the numerical keypad to enter the value for the data point Valid entries range from 8191 to 8191 9 Repeat steps 5 through 8 for additional points until you finish creating your arbitrary waveform Note Each time you press ENTER to complete data point entry numer
87. nstrument are accepted 4 2 2 Local With Lockout State LWLS In the LWLS the device may be operated from the front panel only Its settings may be queried over the GPIB but not changed Commands that do not affect the signal being output by the instrument are accepted The difference between the LOCS and the LWLS is that from the LWLS the device may enter the Remote With Lockout State 4 2 3 Remote State REMS In the REMS the device may be operated from the GPIB Actuating any front panel key will cause the device state to revert to the LOCS 4 2 4 Remote With Lockout State RWLS In the RWLS the device is operable only from the GPIB Front panel operation may be returned by either sending an appropriate IEEE 488 1 command or by cycling the device power 4 3 Interface Function Subsets The following interface function subsets are implemented in the MODEL 4075 and 4078 5 T6 8 DT1 E2 4 4 Device Address The GPIB address of the device may be set to any value from 0 to 31 The address may be changed from the front panel using the numeric keypad or the rotary encoder or via the GPIB itself using the command SYSTem COMMunicate GPIB ADDRess Setting the device to address 31 puts it in the off bus state In this state it will not respond to messages on the GPIB If the device is in REMS when set to address 31 an internal return to local command will be given setting the
88. o REMS the waveform generator unasserts rtl if you do not complete a multiple key sequence in a reasonable length of time about 5 to 10 seconds A record of the front panel settings is in the Current Settings Buffer however new settings entered from the front panel or the controller update these recorded settings In addition the front panel updates to reflect setting changes from controller commands Settings are unaffected by transitions among the 4 remote local states The REMOTE indicator lights when the waveform generator is in REMS or RWLS Local State LOCS When in a local state LOCS you control the settings through the front panel controls In addition only GPIB query commands are executed All other GPIB commandssetting and operationalprompt and error since those commands are under front panel local control NOTE The waveform generator can be in either Local State LOCS or Remote State REMS when the it receives the Local Lockout LLO interface message If in LOCS and REN is asserted the waveform generator enters the Local With Lockout State LWLS or if in REMS it enters the Remote With Lockout State RWLS when it receives LLO The controller controls the LWLS and RWLS state transitions Local Without Lockout State LWLS When the waveform generator is in a local without lockout state LWLS it operates the same as it does in LOCS However in LWLS rtl does not inhibit a transition to remote state Remote State REM
89. o change to other modes of sweep do the following 1 Set sweep to ON FIRST by pressing F1 Then press the MODE button on front panel 3 Select between triggered TRIG burst BURST or gated GATE mode Note If this is done before turning on sweep sweep ON selection will automatically reset to default which sweeps in continuous mode 3 6 8 MODULATION Key Selects the Modulation mode AM FM or FSK To select the output mode press MODUL key then press the function key that corresponds to the desired menu option as shown F1 AM 2 1 0100 000 000 KHz Ampls 00 W Ofst 0 00 5 If the AM is selected following menu is available F1 ON OFF F2 SHAPE F3 MOD FREQ F4 EXT INT 1 000 000 000 KHz 50 w on mi ma Selects the Modulation ON or OFF operating mode Defines the modulation depth from 0 to 100 and the modulation shape between SINE TRIANGLE or SQUARE Selects the modulation frequency from 0 1 Hz to 20 00 KHz Selects and enables the external modulation by an external signal applied to the Modulation In connector If the FM is selected the following menu is available F1 ON OFF F2 DEV SHAPE F3 MOD FREQ 4 EXT INT 41 000 000 000 KHz DEVIATION 75 00 Hz or eee Selects the Modulation ON or OFF
90. of more than 65 5 3 5 Square Transition Times Specification lt 6 ns 10 to 90 at 10Vp p into 50 ohms Procedure 1 Connect the OUTPUT connector to the oscilloscope input using 50 ohm coaxial cable and a 50 ohm feedthrough termination 2 Select WAVE and SQUARE to generate square waveform with 1MHz frequency and 10Vp p 3 Use the oscilloscope markers to measure the Rise and Fall times of the square from 10 to 90 levels 4 CHECK for rise and fall times of lt 12 ns 5 3 6 Square Variable Duty Cycle af Specification variable from 20 to 80 with 0 5 accuracy at 1 KHz Procedure Connect the OUTPUT connector to the counter input using a 50 ohm coaxial cable and a 50 ohm feedthrough termination Select SQUARE to generate square waveform with 1KHz frequency and 5Vp p Set the counter to measure duty cycle and select the automatic trigger mode On the unit change the symmetry to 20 50 and 80 CHECK for duty cycle readings between 19 0 21 0 49 0 51 0 and 79 0 81 0 5 3 7 Operating Modes Specification Continuous triggered gated and burst Procedure 1 Connect the OUTPUT connector to the oscilloscope vertical input using a 50 ohm coaxial cable and a 50 ohm feed through termination 2 Push the MODE key on the unit front panel 3 Verify that the oscilloscope displays a 1KHz sine wave Make sure that the Output is ON 91 4 Set the external function generator for a s
91. operating mode Defines the FM deviation frequency or the modulation shape between SINE TRIANGLE or SQUARE Selects the modulation frequency from 0 1 Hz to 20 00 KHz Selects and enables the external modulation by an external signal applied to the Modulation In connector F3 FSK If the FSK is selected the following menu is available FSK Menu F1 ON OFF Selects the FSK ON or OFF operating mode F2 F HI F LO Defines the High and Low frequency of the FSK F3 RATE Selects the rate of alternation between the low and high frequencies F5 Selects and enables the external FSK when the unit frequency is alternating between the low high frequencies by an external signal applied to the Trig In connector 3 7 ON Key Use these key to control the main output signal When the output is active an internal LED will illuminate the button 3 8 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 9 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 3 10 Power On Settings At power on the w
92. or negative DC level to the output waveform To set voltage offset 1 Press Waveform to display the menu 2 Press F3 OFST to display the offset setting 3 Use the rotary input knob or the numerical keys to set the voltage offset To turn the voltage offset OFF repeat the steps above but set the offset voltage level to 0 3 14 7 Storing and Recalling a Waveform Generator Setup You can store up to 49 front panel setups in a part of non volatile Flash known as the settings storage memory When you recall a stored setup the front panel settings change to match the settings in the stored setup These stored and recalled settings include the starting address and length of the arbitrary memory that is loaded in the execution memory Storing Setups To store the front panel setup 1 Press UTILITY to display the menu 2 Press F2 STORE to select the Store mode 3 Use the rotary input knob to select a buffer number Valid buffer numbers range from 1 to 49 Buffer 0 is read only buffer that contains the power on settings listed in Table 3 2 Note The waveform generator does not warn you when you store a setup into a settings buffer that is already occupied Recalling Setups To recall stored front panel setup Press UTILITY to display menu 2 Press F2 RECALL to select the Recall mode 3 Use the rotary input knob to select a buffer number Valid buffers numbers range from 0 to 49 Buffer 0 is a read only buffer
93. orage users have the freedom to store as many waveforms of different lengths as they desired in a dynamic fashion with the limit of total points not to exceed memory capacity Then by using STORE and RECALL functions to save the starting address and lengths of each created arbitrary waveforms users can quickly locate in the memory and output each of the different waves These functions can behave like reference points so users can actually save up to 49 different waveform reference points in the memory See example illustration below to see how it works Waveform 2 Waveform 3 Waveform 4 Point A pts JR B pts C pts D pts Point A pts B pts C pts D pts lt 400 000 pts Stored Buffer number Data points of different waveforms Start address length 1 A pts 2 B pts 3 C pts 4 D pts From the above illustration all the points of Waveform 1 can be stored and recalled using buffer 1 Likewise Waveform 2 can be stored recalled by buffer 2 Waveform 3 by buffer 3 Waveform 4 by buffer 4 F3 POWER Power on default Selects the power on default setting Select a value using the numeric keypad or the rotary input knob The selection is effective after a 10 s time out period Select zero 0 to have the waveform generator power on with the factory default settings Select 50 to have the waveform generator power on with the settings it had at the last power off Se
94. ot respond to Parallel Poll Complete capability Complete capability No controller functions Three state drive capability Section 5 Performance Check Procedures 5 1 Introduction This section provides the procedure for checking the electrical performance requirements of the Model 4075 4078 Arbitrary Waveform Generators as listed in instrument Operating Manual Section 1 Specifications If the waveform generator fails to meet these checks then you should perform the adjustment procedure Adjustment procedures are available on a separate document The Performance Check Procedures are identical for both channels on the Model 4078 and must be performed separately for each channel At the end of this document a table is provided to record the test results 5 2 Test Equipment The following table lists the equipment necessary to perform the performance tests Any equivalent equipment may be substituted for the recommended model Description Minimum Requirements Oscilloscope Bandwidth gt 400MHz Distortion Analyzer Frequency range 10Hz 100KHz Digital Voltmeter 6 1 2 digits true RMS Universal Counter 200 2 Time A Period Function Generator 10MHz output 500 Feed through 1 to 1GHz high frequency Precision 50Q Feed through 0 1 DC to 100KHz 500 Coaxial Cables with BNC connectors 1 Recommended Model Tektronix DPO4054 Tektronix AA5001 Fluke 8845A Pendulum CNT 90 BK Model 4045 Tektron
95. ou to store and recall up to 50 settings Note Only 49 settings can be restores because 50 is reserved for restoring last known working state of the instrument Each setting can save all the waveform parameters configurations modes starting address length and more Refer to Table 3 2 in section 3 10 to see entire list of stored parameters This way user can quickly recall back the different waves stored in the memory Refer to section 3 6 6 for details Marker Output Selects the marker output address of the signal to be available at the Marker Out connector The F1 ADDR F2 LENGTH or F3 ON OFF be selected and the Marker output signal can be available at any desired location address between the start and stop addresses of the executed waveform This marker output feature will allow you to generate a positive TTL level output signal at the points specified by address and length Note The maximum LENGTH allowed to be set for marker is 4000 Below is an example to illustrate how marker function works Start Address Arbitrary waveform Length from front panel channel output 5 TTL signal output from rear Marker Out connector Marker Function Illustration 4 EDIT Refer to section 3 6 4 below for details Changing one of the arbitrary parameters as start and length causes an update of the output waveform to the new parameters When exiting the Arbitrary Menu by selecting a different waveform a message to sa
96. quare wave output from OV to 2V at 200 Hz Connect the function generator output to the unit TRIG IN connector Set the waveform generator Step 1 Set the output MODE mode to triggered F2 TRIG Step 2 Set the F2 INT trigger source to internal 7 CHECK Verify that the oscilloscope displays one cycle of sine wave per trigger event Set the waveform generator Set the output mode MODE to external trigger F2 TRIG F3 EXT 9 CHECK Verify that the oscilloscope displays one sine waves per external trigger 10 Set the waveform generator Set the output MODE mode to burst F2 BRST F2 INT 11 CHECK Verify that the oscilloscope displays two cycles of sine wave per trigger event 12 If you have a Model 4078 unit connect the CH2 OUTPUT connector to the oscilloscope push CHAN key and repeat steps 2 through 13 for channel 2 using CH2 control settings and CH2 TRIG IN connector 5 3 8 Sync Output Marker Output Reference Output Specification TTL level pulses at programmed frequency Procedure 2 Connect the SYNC OUT connector to the oscilloscope vertical input 3 Set the unit to generate sine waves at 1 KHz and CHECK for a square waveform with levels of OV and gt 4V on the oscilloscope 4 Connect the REF OUT connector to the oscilloscope vertical input 5 CHECK for a 10 MHz square wave with OV and gt 4V levels on the oscilloscope 6 Connect the MARKER OUT connector to the oscilloscope vertical input 7 Program th
97. r internal then the above settings are effective or external and then the external waveform determines deviation shape and frequency of modulation Arguments Type Character Options INTernal EXTernal Command Type Setting or Query Setting Syntax SOURce FM SOURce lt ws gt lt option gt Examples FM SOUR INT FM SOUR EXT Query Syntax SOURce FM SOURce Response INTIEXT 4 13 1 9 FSK modulation The following commands control the FSK modulation 4 13 1 9 1 FSK STATe This command activates or deactivates FSK modulation Arguments Type Boolean Command Type Setting or Query Setting Syntax SOURce FSK STATe lt ws gt ONI1lIOFFIO Examples FSK STAT ON FM OFF Query Syntax SOURce FSK STATe Response 01 4 13 1 9 2 LOWFrequency This command sets lower of two frequencies used FSK modulation Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Examples Response Numeric MHz KHz Hz default The whole frequency range of the current function The value is rounded to 4 digits Setting or Query SOURce FSK LOWFrequency lt ws gt lt frequency gt units SOURce FSK LOWFrequency lt ws gt MINimumIMA Ximum FSK LOWFrequency 5KHZ FSK LOWF 5E3 FSK LOWF MAXIMUM FSK LOWF MIN SOURce FSK LOWFrequency lt ws gt MAXimumIMINimum FSK LOWF FSK LOWF MAX NR3 4 13 1 9 3 FSK HlFrequency This comm
98. ration Type Common Query Syntax OPC Response ASCII character 1 Example FREQ 2 WAI Wait to continue command This command is intended for use with overlapped commands No commands in the instrument are overlapped and so this command has no effect Type Common Command Syntax WAT 4 12 4 Status and Event Commands a CLS Clear status The clear status command clears the SESR and Error Queue status data structures Type Common Command Syntax CLS b ESE Standard event status enable This command is used to set the value of the Standard Event Status Enable Register Arguments Type NRf Range 0 to 255 Non integer arguments are rounded before execution Type Common Command or Query Syntax ESE lt ws gt lt NRf gt Examples ESE 48 Enables the CME and EXE bits ESE 255 Enables all standard events Query Syntax ESE Response lt NRI gt c ESR Standard event status register query This query is used to read the value of the Standard Event Status Register Reading the register clears it Type Common Query Syntax ESR Response lt NRI gt d PSC Power on status clear command This command is used to control the automatic power on clearing of certain status functions Arguments Type Boolean Type Common Command or Query Command Syntax PSC lt ws gt lt Boolean gt Examples PSC ON or PSC 1 PSC OFF or PSC 0 Query Syntax PSC Response ASCII 0
99. rding to their starting point and their length There are no restrictions as to how many different waveforms you can store in the memory so as long as the sum of the points of all the waveforms do not exceed 400 000 points To better illustrate this refer to drawing below Waveform 1 Waveform 2 Waveform 3 Waveform Poin A pts pts C pts D pts Point A pts B pts C pts D pts lt 400 000 pts The following operations can be performed in the waveform memory Insert and scale any of the following predefined waveforms o Sine Triangle o Square Ramp up Ramp down Noise Draw a line between any two points Clear set to zero any set of points or all points Set individual point values After specifying a section of waveform memory for execution the following parameters of the waveform can be configured Point rate frequency Peak to peak amplitude Offset voltage 1 4 Package Contents The following list of items and accessories come in the package 1 4075 or 4078 DDS Function Generator 2 power cord 3 CD containing user manual and waveform creation software Wave X 4 RS232 Serial Cable Specifications Models 4075 4078 Channels 1 Channel 2 Channels Sine 1 uHz to 25 MHz Square 1 uHz to 25 MHz Frequency Triangle Ramp 1 uHz to 5 MHz Characteristics Pulse 1 mHz to 10 MHz Accuracy 0 002 20 ppm
100. requency may currently be set Not all Program Message units have query forms for example STATUS PRESET and some Program Message Units might have only the query form for example SYSTEM VERSION The instrument puts the response to the query into the output queue from where it may be read by the controller The Status Byte MAV bit is set to indicate to the controller that a response is ready to be read 4 10 2 SCPI Command Structure SCPI commands are based on a hierarchical structure This allows the same instrument control header to be used several times for different purposes providing that the mnemonic occurs in a unique position in the hierarchy Each level in the hierarchy is defined as a node Mnemonics in the different levels are separated from each other by a colon The first Program Message Unit or command in a Program Message is always referenced to the root node Subsequent commands are referenced to the same level as the previous command A Program Message Unit having a colon as its first character causes the reference to return to the root This process is defined by IEFE 488 1 section A 1 1 Consider the following examples a The following command may be used to set the amplitude and the offset of the signal SOURCE VOLTAGE AMPLITUDE 5V OFFSET 2V Note that the offset command is referenced to the command preceding it the OFFSET mnemonic resides at the same node as the AMPLITUDE command b This command set the fr
101. restore the state of the device to that stored in the specified memory location Arguments Type lt NRf gt Range 0 to 49 Non integer values are rounded before execution Type Common Command Syntax RCL lt ws gt lt NRf gt Example RCLO Recall default state RCL 49 Stored setting location 49 stores the last instrument setting before power down b SAV Save instrument state 4 13 This command is used to store the current instrument state in the specified memory location Arguments Type lt NRf gt Range 1 to 49 Non integer values are rounded before execution Type Common Command Syntax SAV lt ws gt lt NRf gt Example SAV 25 Stored setting location 0 stores the factory defaults and is a read only location Location 50 stores a copy of the current instrument setting and it too is read only Instrument Control Commands Instrument control commands are grouped into logical subsystems according to the SCPI instrument model They can be used when interfacing with GPIB or RS 232 The commands are comprised of mnemonics indicating the subsystem to which the command belongs and the hierarchy within that subsystem When the command is to be referred to the Root node it should be prefixed with a colon Mnemonics appearing in square brackets are optional The l character is used to denote a choice of specifications The lt ws gt is used to denote a white space character 4 13 1 SOURce Subsystem Th
102. rms of the indicated sizes at the rated baudrate speed umber of data pts 10 000 points 64 000 points 100 000 points 400 000 points Baudrates bps 9600 1 min 3 mins 9 16 mins 40 mins 19200 30 secs 1 min 40 secs 6 mins 15 secs 26 mins 2 10 RS 232 Configuration The instrument use 8 data bits 1 stop bit no parity and baud rate selectable from 2400 to 19 2K 2400 4800 9600 19200 By default the instrument is set at 9600 8 N 1 When the instrument is in remote mode it will display the following screen Remotely Controlled 5232 This screen comes up whenever there is transmission process be it sending or receiving To return to local mode and exit this screen simply press any front panel keys Only do this when nothing is being transmitted or received from a connected PC In the case where a large waveform is being transmitted please allow AT LEAST 15 seconds or more after the PC software or program has finished sending BEFORE pressing a key to return to local mode The instrument requires this time to completely finish generating transmitting the waveform 2 11 GPIB Address The instrument is shipped with the address set to decimal 9 The address can be changed from the front panel by using the UTILITY menu 2 12 GPIB Connections Optional The rear panel GPIB connector is AMPHENOL 57 10240 or equivalent and connects to a standard IEEE 488 bus cable connector The GPIB
103. scription by the mnemonic being enclosed in square brackets This means it is not necessary to write the mnemonic into the Program Header it is a default condition The mnemonic for example is optional Not specifying it will cause the device to search for the mnemonics in the Program Header under the Source Subsystem For example the frequency may be set by the commands FREQ CW 1KHz FREQ 1 KHz since the CW mnemonic is also optional b Program Header Separator The Program Header Separator is used to separate the program header from the program data It consists of one or more whitespace characters denoted as lt ws gt Typically it is a space c Program Data The Program Data represent the values of the parameters being set for example KHZ in the above examples Different forms of program data are accepted depending on the command The Program Data types used in the instrument are i Character program data This form of data is comprised of a mnemonic made up of lower or upper case alpha characters As with Program Header mnemonics some Character Data mnemonics have short and long forms Only the short or the long form may be used ii Boolean data Boolean data indicate that the parameter can take one of two states ON or OFF The parameter may be character type ON or OFF or numeric numeric value is rounded to an integer A non zero result is interpreted as 1 and a zero result as
104. set back to 1 using ARB ADDR command prior to the query 4 13 4 4 Line Draw ARBitrary DRAW lt start address gt lt end address gt This command is used to generate a straight line between two points in the arbitrary waveform memory Arguments Type Numeric Range 1 to 400 000 Rounding to integer value Command Type Setting only Setting Syntax ARBitrary DRAW lt ws gt lt start address gt lt end address gt Example ARB DRAW 1 1000 Considerations 1 The value of the data at the start and end points must first be set by the user using the ARB DATA command For example suppose a line needs to be drawn from address 1000 to 2000 with data point values 4000 and 8191 respectively like below lt lt Line to Draw A A To do this 1 Set address to 1000 by sending ARB ADDR 1000 2 Set data to 4000 by sending ARB DATA 4000 3 Set address to 4000 by sending ARB ADDR 4000 4 Set data to 8191 by sending ARB DATA 8191 5 Then use ARB DRAW 1000 4000 to get the above line 2 The range of the straight line cannot overlap with protected memory 3 The end address must be greater than the start address 4 13 4 5 Clear ARBitrary CLEar lt start address gt lt end address gt This command is used to clear all or a portion of waveform memory The memory is the set to the value zero Arguments Type Numeric Numeric Range 1 to 400 000 Rounding to integer value Command Type Setting only Setting
105. stem The Trigger Subsystem is used to control the waveform triggering The command structure is as follows TRIGger CONTinuousITRIGgerlIGATEIBURSt BURSt lt numeric value gt 5 0 lt MANuallINTernallEXTernallB US TIMer lt numeric value gt Note For model 4078 nothing changes in the commands above to control channel 1 But for channel 2 change TRIG TRIG2 For example to change channel 2 mode to gate send the command TRIG2 MODE GATE 4 13 3 1 Trigger Mode TRIGger MODE lt trigger mode gt This command is used to set the trigger mode It is not a standard SCPI command Arguments Type Character Options CONTinuous TRIGger GATE BURSt Command Type Setting or Query Setting Syntax TRIGger MODE lt ws gt lt option gt Examples TRIG MODE CONT TRIG MODE BURS Query Syntax TRIGger MODE Response CONTITRIGIGATEIBURS 4 13 3 2 Trigger Source TRIGger SOURce lt trigger source gt This command is used to select the trigger source for use in the Trigger Gate and Burst trigger modes Arguments Type Character Options MANual Front panel MAN key BUS GPIB trigger GET or TRG INTernal Internal trigger EXTernal External trigger Command Type Setting or Query Setting Syntax TRIGger SOURce lt ws gt lt option gt Examples TRIG SOUR BUS TRIG SOUR INT Query Syntax TRIGger SOURce Response MANIBUSIINTIEXT 4 13 3 3 Burst Count TRIGger BURSt lt burst coun
106. t SOURce PULse FAL lt ws gt MINimumIMA Ximum SOURce 500NS SOURce PULse FALI lt ws gt MINimum IMAXimum NR3 Duty Cycle SOURce DCYCle lt duty cycle value gt This command is used to set duty cycle of square wave or the symmetry of triangular wave The value is given in percent Arguments Type Numeric Units None percent implied Range 20 to 80 Rounding to integer Command Type Setting or Query Setting Syntax SOURce DCYCle lt ws gt lt duty cycle value gt SOURce DCYCle lt ws gt MINimumIMAXimum Query Syntax SOURce DCYC1le lt ws gt MINimumIMAXimum Response NR3 4 13 2 OUTPut Subsystem The Output Subsystem controls characteristics of the source s output Included in this subsystem are the State and Summing commands The command structure is as follows STATe lt Boolean gt SUMming lt Boolean gt Note For model 4078 nothing changes in the commands above to control channel 1 But for channel 2 change OUTP to OUTP2 For example to change channel 2 output to ON send the command OUTP2 ON or OUTP2 1 4 13 2 1 Output State OUTPut STATe lt state 0 1 gt This command controls whether the output is ON or OFF Arguments Type Boolean Command Type Setting or Query Setting Syntax OUTPut STATe lt ws gt ONI1IOFFIO Examples OUTP STAT ON OUTP OFF Query Syntax OUTPut STATe Response 01 4 13 3 Trigger Subsy
107. t lt error description gt A table of error numbers and their descriptions is presented here No error reported 0 No error Command Errors A command error is in the range 199 to 100 and indicates that a syntax error was detected This includes the case of an unrecognized header The occurrence of a command error causes the CME bit bit 5 of the Standard Event Status Register to be set 100 Command Error 101 Invalid character 102 Syntax error 103 Invalid separator 104 Data type error 105 GET not allowed 108 Parameter not allowed More parameters than allowed were received 109 Missing parameter Fewer parameters than necessary were received 110 Command header error 111 Header separator error 112 Program mnemonic too long The mnemonic must contain no more than 12 characters 113 Undefined header 120 Numeric data error 121 Invalid character in number 123 Exponent too large 488 2 specifies maximum of 32000 124 Too many digits 488 2 specifies maximum of 255 digits in mantissa 128 Numeric data not allowed A different data type was expected 131 Invalid suffix 134 Suffix too long A maximum of 12 characters are allowed in a suffix 138 Suffix not allowed 140 Character data error 141 Invalid character data Incorrect character data were received 144 Character data too long Character data may contain no more than 12 characters 148 Character data not allowed 158 String data not allowed
108. t gt Used to set the number of cycles to be output in the BURST mode It is not a standard SCPI command Arguments Type Range Rounding Command Type Setting Syntax Examples Query Syntax Response Examples Numeric 1 to 999999 to integer value Setting or Query TRIGger BURSt lt ws gt lt value gt TRIG BURS 100 TRIG BURS MAXIMUM TRIGger BURSt lt ws gt MA XimumIMINimum NRI TRIG BURST TRIG BURS MAX 4 13 3 4 Internal Trigger Rate TRIGger TIMer lt trigger rate gt Sets the rate of the internal trigger Arguments Type Units Range Rounding Command Type Setting Syntax Examples Query Syntax Response Examples Numeric S mS uS nS 1E 6S to 1005 to 4 digits Setting or Query TRIGger TIMer lt ws gt lt value gt units TRIGger TIMer lt ws gt MINimumIMA Ximum TRIG TIM 10E 6 TRIG TIM MIN TRIGger TIMer lt ws gt MINimumIMAXimum NR3 TRIG TIM TRIG TIM MIN 4 13 4 Arbitrary Subsystem The Arbitrary subsystem is not part of the SCPI standard It was developed to suit the needs of the instrument Within this subsystem are commands to 1 control the point rate start address wavelength marker address and synchronization pulse address 2 set values of the arbitrary waveform either discretely or using predefined copy or draw functions 3 protect an area of waveform memory 4 set the state of the automatic update and increment features
109. t protect start gt lt protect end gt in format 4 13 4 8 Memory Protection State ARBitrary PROTect STATe lt Boolean gt This command is used to enable or disable arbitrary waveform write protection Arguments Type Boolean Command Type Setting or Query Setting Syntax ARBitrary PROTect STATe lt ws gt ONI1IOFFIO Example Query Syntax Response ARB PROT STAT ON ARBitrary PROTect STATe oll 4 13 4 9 Predefined Waveforms ARB PRED lt shape gt lt start address gt lt length gt lt scale gt Arguments Shape Type Options Start Address Type Range Rounding Length Type Range SIN SQU TRI NOIS ANO Rounding Scale Type Range Rounding Command Type Setting Syntax Examples Considerations This command is used to load the waveform memory with a specific type of waveform Character SINusoid SQUare TRIangle NOISe Pseudo Random Noise ANOise Noise added to the current waveform Numeric The MIN and MAX forms both set the address to 1 1 to 400 000 to integer value Numeric 16 to 65 536 divisible by 4 2 to 65 536 divisible by 2 16 to 65 536 divisible by 4 16 to 65 536 16 to 65 536 to integer value Numeric MIN sets the scale to 1 MAX sets the scale to 100 1 to 100 See considerations to integer value Setting only ARBitrary PREDefined lt ws gt lt shape gt lt start gt lt length gt lt scale gt SIN 1 1e3 10
110. that contains the power on settings listed in Table 3 2 4 Programming 4 1 Overview 4 1 1 GPIB This section provides detailed information on programming the 4075 and 4078 via the IEEE 488 bus referred to from now as the GPIB General Purpose Interface Bus The 4075 and 4078 are programmable over the IEEE 488 1 bus and its message protocol is compatible with IEEE 488 2 The device command set is compatible with the SCPI 1992 0 standard The command syntax as defined by the IEEE 488 2 and SCPI standards is briefly explained in the following sections Users who have experience programming GPIB instruments may skip these paragraphs and go directly to where the individual command syntax is given in sections 4 12 and 4 13 Considering the relative newness of these standards it is recommended to all users to read the explanations given here Users wishing to gain further insight should consult the standards 4 1 2 RS 232 C The RS 232 C standard is not very specific about many of the handshaking signals and it is therefore usually necessary to refer to the manuals for both of the devices being connected to determine the exact pin out signal definition and signal direction for the devices Refer to section 2 9 The serial interface implements the same SCPI command set as the GPIB interface This includes commands stated in sections 4 12 and 4 13 Refer to these sections for syntax details The instrument is programmed by sending
111. the 50 ohm 0 1 termination 4 Set the DVM to measure ac volts 5 the unit to generate a SINE wave signal with 1 KHz frequency and an amplitude of 10Vp p 6 CHECK that the measured voltages the DVM at 10Vp p 5Vp p 3Vp p 1Vp p 100 mVp p and 50mVp p are in the accuracy range 88 Amplitude Minimumreading Maximum reading RMS DVM reading RMS setting RMS 10Vp p 3 499V 3 572V 5Vp p 1 749V 1 786V 3Vp p 1 049V 1 072V 1Vp p 0 349V 0 358V 100mVp p 34 37 mV 50mVp p 17 19 5 Set the unit to generate a SQUARE wave with 1KHz frequency 6 CHECK that the measured voltages on the DVM at 10Vp p 5Vp p 3Vp p 1Vp p 100 mVp p and 50mVp p are in the accuracy range Amplitude Minimumreading Maximum reading RMS DVM reading RMS setting RMS 10Vp p 4 949V 5 051V 5Vp p 2 474V 2 526V 3Vp p 1 484V 1 516V 1Vp p 0 494V 0 51 100mVp p 49 52 mV 50mVp p 24 26 4 Set the unit to the ARBITRARY function and generate sine wave signal Press the ARB key Select F2 ARB Select F4 EDIT Select PREDEF Select F2 FROM press key 1 and ENTER Select F2 DATA press key 0 and ENTER Select LENG press 1000 and ENTER Select SCALE press 100 and ENTER Select 4 EXEC Select YES Select ARB Select F1 FREQ press 1000 Hz Select OUT 8 CHECK that the measur
112. the instrument Sending the STATus PRESet command will disable these events from being reported 401 Power on 402 Operation complete The OPC command has been executed Warnings The execution of some commands might cause an undesirable instrument state The commands are executed but a warning is issued Sending the STATus PRESet command disables reporting of warnings The existence of these conditions causes a bit in the Status Questionable Condition register to be set refer to section 4 13 5 4 For Model 4075 500 Trigger rate short 510 Output overload For Model 4078 500 Trigger rate short on channel 1 501 Trigger rate short on channel 2 510 Output overload on channel 1 511 Output overload on channel 2 Trigger rate short means that the period of the waveform is larger than the value of the internal trigger rate Thus not every trigger will generate a cycle or burst of the waveform 4 12 Common Commands The following section describes the common commands according to the IEEE 488 2 specifications These commands are applicable for both GPIB and RS 232 interface 4 12 1 System Data Commands Identification query The identification query enables unique identification of the device over the GPIB This query should always be the last in a program message It returns a string with four fields Manufacturer name Model name Serial number 0 if not relevant Version number Command Type Common Query Synta
113. tion later in this section F2 CLEAR Displays the Clear menu see the Clear Function later in this section PROT Displays the Protect menu see the Protect Function later in this section 4 SHOW WAVE Display the Arbitrary waveform in full screen mode on LCD display This is only an approximated display for quick viewing It does not represent the exact waveform being generated To return back to the MENU selection press any button Full Display Example Copy Function Copies an area of waveform memory to another area of waveform memory 1 FROM Selects the address of the first point to copy F2 LENG Selects the length number of points of the waveform to copy F3 TO Selects the destination address where the first point is copied F4 EXEC Prompts you to confirm whether to copy Press NO to abort copying YES to copy Clear Function Clears sets the data values to zero either a section of or all of waveform memory F1 FROM Selects the address of the first point to clear F2 TO Selects the address of the last point to clear ALL Clears the whole waveform memory Equivalent to selecting from 1 to 400 000 F4 EXEC Prompts you to confirm whether to clear Press NO to abort clearing YES to clear Protect Function Protects makes read only a section of waveform memory F1 FROM Selects the address of the first point to protect F2 TO Selects the address of the last point to prote
114. tions 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 4075 and 4078 Function Generators are 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 Product Dimensions SOTD DUAL ARBITRARY FUNCTION GENERATOR C ECES EX PERSON tee 88 mm 300 hanee 277 2 6 Power Requirements The Model 4075 and 4078 can be operated from any source of 90 V to 264 V AC frequency from 48 Hz to 66 Hz The maximum power consumption is 50 VA Use a slow blow fuse UL CSA approved of 1 A 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 7 Grounding Requirements For the safety of operating personnel the instrument must be grounded The central pin on the AC plug grounds the instrument when properly connected to the ground wire and plugged into proper receptacle WARNING TO AVOID PERSONAL INJURY DUE TO SHOCK THE TH
115. triangle External 5 Vp p for 100 deviation 10 KQ input impedance 0 01 2 50 kHz bandwidth S Sweep Shape Linear and Logarithmic up or down ed Sweep Time 20 ms to 500 5 Characteristics s Sweep Trigger internal external continuous or burst TTL Compatible Maximum rate 10 MHz in ARB mode 3 MHz in DDS Trigger IN mode Minimum width 50ns TTL pulse at programmed frequency 50ohms source impedance Inputs and 5 Vp p for 100 modulation Outputs Modulation IN 10 KQ input impedance DC to gt 50 kHz minimum bandwidth Marker Out Positive TTL pulse user programmable in Arbitrary waveform 50 O source impedance Reference IN OUT 10 MHz TTL compatible input or output for external unit synchronization 50 output impedance and 1 input Repetition 1 us to 100s Internal Trigger Resolution 4 digits Accuracy 0 002 Store Memory 50 full panel settings at power off Arbitrary Memory 400 000 points in flash memory Dimensions 8 4 213 x 3 5 88 x 12 300 inches mm WxHxD Weight Approx 3 kg Power 100 VAC 240 VAC 10 50 VA max Operating 0 C to 50 C General Temperature Non 20 to 70 C operating Humidity 95 RH 0 C to 30 C EMC According to EN55011 for radiated and conducted emissions Electrical Discharge Immunity According to EN55082 Safety Specifications According to EN61010 CE approved NOTE Specifi
116. ts the address to 30 not 31 Default Power on is address 9 4 13 6 2 Error Queue Reading 5 This query returns first entry in error queue and removes that entry from queue Its function is identical to that of the STATus QUEue NEXT query Command Type Query only Query Syntax SYSTem ERRor Response lt Error number gt lt error description gt 4 13 6 3 SCPI Version SYSTem VERSion This query is used to read the SCPI version to which the instrument complies Command Type Query only Query Syntax SYSTem VERSion Response 1992 0 NR2 format 4 13 6 4 Security SYSTem SECurity STATe lt Boolean gt This command enables the instrument memory to be cleared The stored settings and the arbitrary waveform memory are cleared when the Security state is changed from ON to OFF The instrument state is returned to the factory power on default Arguments Type Boolean Command Type Setting or Query Setting Syntax SYSTem SECurity STATe lt ws gt ONI1IOFFIO Examples SYST SEC SYST SEC OFF Query Syntax SYSTem SECurity STATe Response 4 13 6 5 Power on Buffer SYSTem POBuffer lt buffer number gt This command is used to set the Power On Buffer setting The instrument will power on with the setting stored in that buffer Arguments Type Numeric Range 0 to 49 Rounding to integer value Command Type Setting or Query Setting Syntax SYSTem PO
117. uch that there are not enough places in the queue for the new message the device will put off putting the message in the queue until there is place for it The Status Byte MAV bit when set indicates that part or all of a response message is ready to be read 4 5 3 Response Messages The device sends a Response Message in response to a valid query All queries return a single Response Message Unit In only one case is the Response Message generated when the response is read as opposed to when the response is parsed and this is when querying Arbitrary Waveform data All other queries generate the Response Message when they are parsed 4 5 4 Coupled Commands Coupled Commands are either commands whose execution validity depends on the value of other parameters or commands whose execution changes the value of another parameter The execution of commands designated as being coupled is deferred until all other commands in the same Program Message have been executed The coupled commands are then grouped together according to their functionality and executed as a group These groups of coupled commands are defined in the MODEL 4075 and 4078 a The commands to set the amplitude the offset and to switch the output on The output being switched on is included here in order to prevent possible damage to the equipment being driven as a result of the amplitude and offset not being executed as intended by the user due to an execution error b The
118. ve the Arbitrary wave will be displayed Select YES or NO to save the new waveform This save functions the same as the SAVE ARB function AMPL OEFST Selects the Amplitude or Offset parameter In Arbitrary mode this setting defines the maximum peak to peak amplitude of a full scale waveform If the waveform does not use the full scale of data 8191 to 8191 then its actual amplitude will be smaller Selects the Offset parameter Change the offset by using the cursor keys rotary knob or numerical keypad If a certain setting cannot be produced the waveform generator will display a Setting Conflict message 4 INTCLK EXTCLK Selects between using the internal clock or external clock For Model 4078 only For the 4078 with dual channels channel 1 CH1 is the MASTER channel If selected for external clock EXTCLK the same clock will also be applied to channel 2 CH2 if EXTCLK is also selected in CH2 Note There is only one BNC connector for external clock input which is common to both channels 3 6 4 Arbitrary EDIT Menu Enters data for creating arbitrary waveforms You can enter data one point at a time as a value at an address draw a line from one point a value at an address to another point create a predefined waveform or combine these to create complex waveforms The valid data values range is 8191 to 8191 The valid waveform memory addresses range from 1 to 400 000 The data value governs the output
119. x IDN Response B amp K MODEL 4078 0 V 1 03 b OPT Option identification query The Option Identification Query is used to identify device options over the system interface This query should always be the last in a program message Command Type Common Query Syntax OPT Response No option available 4 12 2 Internal Operation Commands a RST Reset command The Reset command performs a device reset It causes the device to return to the factory default power up state Type Common Command Syntax RST b TST Self test query The self test query causes an internal self test to be performed This test consists of checking the integrity of the arbitrary waveform memory Type Common Query Syntax TST Response ASCII 0 if test passes ASCII 1 if test fails 4 12 3 Synchronization Commands a OPC Operation complete command The operation complete command causes the device to generate the operation complete message in the Standard Event Status Register on completion of the selected device operation Type Common Command Syntax OPC Examples FREQ 5KHZ OPC The OPC command and the OPC query described below find use mainly when commands having relatively long execution times are executed for example the programming of long predefined waveforms b OPC Operation complete query The operation complete query places an ASCII character 1 in the output queue on completion of the selected device ope
120. y The following safety 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 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 re

4075 & 4078 User Manual

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4075 &amp; 4078 User Manual

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4075 & 4078 User Manual