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AFG2021 Arbitrary Function Generator Programmer Manual

1. AFG2021 Arbitrary Function Generator Programmer Manual SYSTem BEEPer STATe 2 82 SYSTem BEEPer MMediate 2 82 SYSTem ERRor NEXT 2 83 SYSTem KCLick STATe 2 83 SYSTem KLOCKk STATe 2 84 SYSTem PASSword CDISable 2 84 SYSTem PASSword NEW 2 86 SYSTem PASSword CENable 2 85 SYSTem PASSword CENable STATe 2 85 SYSTem SECurity MMediate 2 87 SYSTem ULANguage 2 87 SYSTem VERSion 2 88 T TRACe DATA CATalog 2 88 TRACe DATA COPY 2 89 TRACe DATA DEFine 2 91 TRACe DATA DELete NAME 2 92 Index TRACe DATA LOCK STATe 2 92 TRACe DATA POINts 2 93 TRACe DATA DATA 2 89 TRACe DATA DATA LINE 2 90 TRACe DATA DATA VALue 2 91 TRG 2 93 TRIGger SEQuence SLOPe 2 94 TRIGger SEQuence SOURCce 2 94 TRIGger SEQuence TIMer 2 95 TRIGger SEQuence IMMediate 2 95 TST 2 96 U user request events 3 16 W WAI 2 97 AFG2021 Arbitrary Function Generator Programmer Manual Index 3
2. SOURce 1 FREQuency STOP Group Syntax Related Commands Arguments Returns Examples This command sets or queries the stop frequency of sweep for the specified channel This command is always used with the SOURce 1 FREQuency STARt command The setting range of stop frequency depends on the waveform selected for sweep For more information refer to the AFG2021 instrument Specifications and Performance Verification Manual Source SOURCe 1 FREQuency STOP lt frequency gt MINimum MAXi mum SOURCe 1 FREQuency STOP MINimum MAXimum SOURce 1 FREQuency MODE SOURce 1 FREQuency STARt lt frequency gt lt NRf gt lt units gt where lt NRf gt is the stop frequency lt units gt Hz kHz MHz lt frequency gt SOURCe1 FREQuency STOP 100KHzZ sets the stop frequency of CH 1 to 100 kHz AFG2021 Arbitrary Function Generator Programmer Manual 2 51 Command Descriptions SOURce 1 FSKey FREQuency Group Syntax Arguments Returns Examples This command sets or queries the hop frequency of FSK modulation for the specified channel Source SOURCe 1 FSKey FREQuency lt frequency gt MINimum MAXimum SOURce 1 FSKey FREQuency MINimum MAXimum lt frequency gt lt NRf gt lt units gt where lt NRf gt is the hop frequency lt units gt Hz kHz MHz lt frequency gt SOURCe1 FSKey FREQuency 1 0MHz sets the hop frequency of CH 1 FSK m
3. 2 24 This command copies a screen image and saves the image file to a USB memory The default file name is TEKO00nnn BMP where nnn is a consecutive number from 000 through 999 The image files are saved in a folder named TEK in the USB memory Screen copy HCOPy SDUMp IMMediate None HCOPY SDUMP IMMEDIATE copies the screen image and may create a file TEK00001 BMP in a USB memory This query only command returns identification information on the instrument System AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Syntax IDN Arguments None Returns lt Manufacturer gt lt Model gt lt Serial Number gt lt Firmware Level gt where lt Manufacturer gt TEKTRONIX lt Model gt AFG2021 lt Serial Number gt lt Firmware Level gt SCPI 99 0 FV 2 0 Examples IDN might return the following response TEKTRONIX AFG2021 C100101 SCPI 99 0 Fv 1 0 MEMory STATe DELete No Query Form This command deletes the contents of specified setup memory If a specified setup memory is not allowed to overwrite or delete this command causes an error Group Memory Syntax MEMory STATe DELete 1 2 3 4 Arguments 1 2 3 or 4 specifies the location of setup memory Examples MEMORY STATE DELETE 1 deletes the contents of specified setup memory MEMory STATe LOCK This command sets or queries whether to lock the specified setup memory If you lock a setup memory you
4. MINimum sets the load impedance to 1 Q MAXimum sets the load impedance to 10 kQ lt ohms gt lt NR3 gt OUTPutl IMPedance MAXimum sets the CH 1 load impedance to 10 KQ AFG2021 Arbitrary Function Generator Programmer Manual 2 33 Command Descriptions OUTPut 1 POLarity Group Syntax Arguments Returns Examples OUTPut 1 STATe Group Syntax Arguments Returns Examples 2 34 This command inverts a specified output waveform relative to the offset level The query command returns the polarity for the specified channel Output OUTPut 1 POLarity NORMal INVerted OUTPut 1 POLarity NORM al sets the specified output waveform polarity to Normal INVerted sets the specified output waveform polarity to Inverted NORM INV OUTPut1 POLarity NORMal sets the CH 1 waveform polarity to Normal This command sets or query whether to enable the instrument output for the specified channel Output OUTPut 1 STATe 0N OFF lt NR1 gt OUTPut 1 STATe ON or lt NR1 gt 0 enables the instrument output OFF or lt NR1 gt 0 disables the instrument output lt NRI gt OUTPUT1 STATE ON sets the instrument CH 1 output to ON AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions OUTPut TRIGger MODE PSC Group Syntax Arguments Returns Examples Group Syntax This command sets or queries the mode trigger or sync for Trigger Outp
5. SOURCe1 PM INTernal FUNCtion SQUare selects Square as the shape of modulating waveform for the CH 1 output SOURce 1 PM INTernal FUNCtion EFlLe Group Syntax Arguments Returns Examples This command sets or queries an EFILe name used as a modulating waveform for PM modulation A file name must be specified in the mass storage system This command returns if there is no file in the mass storage Source SOURCe 1 PM INTernal FUNCtion EFILe lt file_name gt SOURCe 1 PM INTernal FUNCtion EFILe lt file_name gt lt string gt specifies a file name in the mass storage system The lt file_name gt includes path Path separators are forward slashes lt file_name gt SOURCe1 PM INTernal FUNCtion EFILe SAMPLEL sets a file named SAMPLE in the mass storage SOURce 1 PM SOURce This command sets or queries the source of modulation signal of PM modulation for the specified channel AFG2021 Arbitrary Function Generator Programmer Manual 2 59 Command Descriptions Group Syntax Arguments Returns Examples SOURce 1 PM STATe Group Syntax Arguments Returns Examples Source SOURCe 1 PM SOURCe INTernal ExTernal SOURCe 1 PM SOURCe INTernal means that the carrier waveform is modulated with an internal source EXTernal means that the carrier waveform is modulated with an external source INT EXT SOURCe1 PM SOURCe INTernal set
6. Table 3 7 Execution error messages cont Error code Error message 291 Out of memory 292 Referenced name does not exist 293 Referenced name already exists 294 Incompatible type The following table shows lists the device specific errors that can occur during instrument operation These errors may indicate that the instrument needs repair Table 3 8 Device specific error messages Error code Message 300 Device specific error 310 System error 311 Memory error 312 PUD memory lost 313 Calibration memory lost 314 Save recall memory lost 315 Configuration memory lost 320 Storage fault 321 Out of memory 330 Self test failed 340 Calibration failed 350 Queue overflow 360 Communication error 361 Parity error in program message 362 Framing error in program message 363 Input buffer overrun 365 Time out error The following table shows lists the error codes that are returned in response to an unanswered query Table 3 9 Query errors Error codes Message 400 query error 410 query INTERRUPTED 420 query UNTERMINATED AFG2021 Arbitrary Function Generator Programmer Manual Status and Events Power on Events User Request Events Request Control Events Operation Complete Events Device Errors Table 3 9 Query errors cont Error codes Message 430 query DEADLOCKED 440 query UNTERMINATED after indefinit
7. 27970560 SAMPLE1 TFS 5412 This command changes the current working directory in the mass storage system Mass Memory MMEMory CDIRectory lt directory_name gt MMEMory CDIRectory lt directory_name gt lt string gt indicates the current working directory for the mass storage system If you do not specify a parameter the directory is set to the RST value At RST this parameter is set to the root lt directory_name gt lt string gt MMEMORY CDIRECTORY AFG WORKO changes the current directory to AFG WORKO MMEMory DELete No Query Form 2 28 Group This command deletes a file or directory from the mass storage system If a specified file in the mass storage is not allowed to overwrite or delete this command causes an error You can delete a directory if it is empty Mass Memory AFG2021 Arbitrary Function Generator Programmer Manual Syntax Arguments Examples Command Descriptions MMEMory DELete lt file_name gt lt file_name gt lt string gt specifies a file to be deleted MMEMORY DELETE TEKOO1 TFW deletes the specified file from the mass storage MMEMory LOAD STATe No Query Form Group Syntax Related Commands Arguments Examples This command copies a setup file in the mass storage system to an internal setup memory If a specified internal setup memory is locked this command causes an error When you power off the instrument the setu
8. The following table lists and describes the Memory commands Table 2 8 Memory commands Header Description MEMory STATe DELete Delete the setup memory MEMory STATe LOCK Set query the lock of setup memory overwrite and deletion MEMory STATe RECall AUTo Set query the recall of last set memory MEMory STATe VALid Query the availability of setup memory RCL Recall instrument setting from setup memory SAV Save instrument setting to setup memory AFG2021 Arbitrary Function Generator Programmer Manual 2 11 Command Groups 2 12 Mass Memory Commands Mass Memory commands let you change mass memory attributes The following table lists and describes the Mass Memory commands Table 2 9 Mass Memory commands Header Description MMEMory CATalog Query the status of mass memory MMEMory CDIRectory Set query current directory MMEMory DELete Delete file or directory in mass memory MMEMory LOAD STATe Copy instrument setting in mass memory to setup memory MMEMory LOAD TRACe Copy waveform data file in mass memory to edit memory MMEMory LOCK STATe Set query the lock of mass memory overwrite and deletion MMEMory MDIRectory Create directory in mass memory MMEMory STORe STATe Save the setup memory status to mass memory MMEMory STORe TRACe Save waveform data file in edit memory to mass memory Output Commands Output commands let you set output attributes The following table lists and
9. lt NR1 gt 0 indicates that the internal calibration completed without errors lt NR1 gt 0 indicates that the instrument detected an error Examples CALIBRATION ALL performs an internal calibration CALIBRATION ALL performs an internal calibration and returns results For example it might return 0 which indicates that the calibration completed without any errors CLS No Query Form This command clears all the event registers and queues which are used in the instrument status and event reporting system Group Status Syntax CLS Arguments None Examples CLS clears all the event registers and queues DIAGnostic ALL The DIAGnostic ALL command performs a self test The DIAGnostic ALL command returns the results after executing the test NOTE The self test can take several minutes to complete During this time the instrument does not execute any commands Do not power off the instrument during the self test Group Calibration and Diagnostic AFG2021 Arbitrary Function Generator Programmer Manual 2 19 Command Descriptions Syntax Related Commands Arguments Returns Examples DISPlay BRIGhtness 2 20 Group Syntax Arguments Returns DIAGnostic ALL DIAGnostic ALL TST None lt NR1 gt where lt NR1 gt 0 indicates that the self test completed without errors lt NR1 gt 0 indicates that the instrument detected an error DIAGNOSTIC ALL performs a
10. or arbitrary waveform for the carrier waveform Source SOURCe 1 FSKey STATe ON OFF lt NR1 gt SOURce 1 FSKey STATe ON or lt NR1 gt 0 enables FSK modulation OFF or lt NR1 gt 0 disables FSK modulation AFG2021 Arbitrary Function Generator Programmer Manual 2 53 Command Descriptions Returns Examples lt NR1 gt SOURCe1 FSKey STATe ON enables the CH 1 FSK modulation SOURce 1 FUNCtion EFILe Group Syntax Arguments Returns Examples This command sets or queries an EFILe name used as an output waveform A file name must be specified in the mass storage system This command returns if there is no file in the mass storage Source SOURCe 1 FUNCtion EFILe lt file_name gt SOURCe 1 FUNCtion EFILe lt file_name gt lt string gt specifies a file name in the mass storage system The lt file_name gt includes path Path separators are forward slashes lt file_name gt SOURCe1 FUNCtion EFILe SAMPLE1 sets a file named SAMPLE1 in the mass storage SOURce 1 FUNCtion RAMP SYMMetry Group Syntax Arguments 2 54 This command sets or queries the symmetry of ramp waveform for the specified channel The setting range is 0 0 to 100 0 Source SOURCe 1 FUNCtion RAMP SYMMetry lt symmetry gt MINimum MAXimum SOURCe 1 FUNCtion RAMP SYMMetry MINimum MAXimum lt symmetry gt lt NR2 gt lt units gt where lt NR2 gt is th
11. 0587 007 Figure 1 3 Event driven program Connecting the Interface The AFG2021 with Option GL has a 24 pin GPIB connector on its rear panel as shown in the following figure The AFG2021 base model provides a USB port only This connector has a D type shell and conforms to IEEE Std 488 1 1987 Attach an IEEE Std 488 1 1987 GPIB cable Tektronix part number 012 0991 00 to this connector 1 2 AFG2021 Arbitrary Function Generator Programmer Manual Getting Started AC line connector AD l yl _ 0587 008 GPIB LAN connector connector Figure 1 4 GPIB connector rear panel with Option GL only Using the GPIB Port The instrument has Talker Listener functions through which it can communicate with other devices as well as the external controller located on the bus Q GPIB cable OooOO000 T a000 Q000 0 G00 0A 09 0o000 90000 Controller Using the generator as a talker or listener osar Figure 1 5 GPIB connection AFG2021 Arbitrary Function Generator Programmer Manual 1 3 Getting Started GPIB Requirements Setting the GPIB Address Using TekVISA Observe the following rules when you use your instrument with a GPIB network Assign a unique device address to each device on the bus No tw
12. 1 PM INTernal FUNCtion Set query internal modulation waveform SOURce 1 PM INTernal FUNCtion EFILe Set query EFlLe name SOURce 1 PM SOURce Set query phase modulation source SOURce 1 PM STATe Set query phase modulation status SOURce 1 PULSe DCYCle Set query pulse waveform duty cycle SOURce 1 PULSe DELay Set query pulse waveform lead delay SOURce 1 PULSe HOLD Set query pulse waveform parameter SOURce 1 PULSe PERiod Set query pulse waveform period SOURce 1 PULSe TRANsition LEADing AFG2021 Arbitrary Function Generator Programmer Manual Set query pulse waveform leading edge time 2 13 Command Groups 2 14 Table 2 11 Source commands cont Header Description SOURce 1 PULSe TRANsition TRAiling Set query pulse waveform trailing edge time SOURce 1 PULSe WIDTh Set query pulse waveform width SOURce 1 PWM DE Viation DCY Cle Set query pulse width modulation deviation SOURce 1 PWM INTernal FREQuency Set query pulse width modulation frequency SOURce 1 PWM INTernal FUNCtion Set query pulse width modulation waveform SOURce 1 PWM INTernal FUNCtion EFILe Set query EFlLe name SOURce 1 PWM SOURce Set query pulse width modulation source SOURce 1 PWM STATe Set query pulse width modulation status SOURce 1 SWEep HTIMe Set query sweep hold time SOURce
13. 2 saves the current instrument state in the memory location 2 SOURce 1 AM DEPTh Group Syntax This command sets or queries the modulation depth of AM modulation for the specified channel You can set the modulation depth from 0 0 to 120 0 with resolution of 0 1 Source SOURCe 1 AM DEPTh lt depth gt MINimum MAXimum SOURCe 1 AM DEPTh MINimum MAXimum AFG2021 Arbitrary Function Generator Programmer Manual 2 37 Command Descriptions Arguments Returns Examples lt depth gt lt NR2 gt lt units gt where lt NR2 gt is the depth of modulating frequency lt units gt PCT MINimum sets the modulation depth to minimum value MAXimum sets the modulation depth to maximum value lt depth gt SOURCe1 AM DEPth MAXimum sets the depth of modulating signal on CH 1 to the maximum value SOURce 1 AM INTernal FREQuency 2 38 Group Syntax Related Commands Arguments Returns This command sets or queries the internal modulation frequency of AM modulation for the specified channel You can use this command only when the internal modulation source is selected You can set the internal modulation frequency from 2 mHz to 50 00 kHz with resolution of 1 mHz You can select the source of modulating signal by using the SOURce 1 AM SOURce INTernal EXTernal command Source SOURCe 1 AM INTernal FREQuency lt frequency gt MINimum MAXimum SOURCe 1 AM INTernal FREQue
14. 36 registers 3 3 request control events 3 16 RST 2 36 S SAV 2 37 SCPI commands and queries 2 4 SCPI conformance information A 1 service request enable register 3 9 SESR 3 5 SOURce ROSCillator SOURCce 2 69 SOURce 1 AM INTernal FREQuency 2 38 SOURce 1 AM INTernal FUNCtion 2 39 SOURce 1 AM INTernal FUNCtion EFILe 2 39 SOURce 1 AM SOURCce 2 40 SOURce 1 AM STATe 2 40 SOURce 1 AM DEPTh 2 37 SOURce 1 BURSt MODE 2 41 SOURce 1 BURSt NCYCles 2 41 SOURce 1 BURSt TDELay 2 43 SOURce 1 BURSt STATe 2 42 SOURce 1 COMBine FEED 2 43 SOURce 1 FM INTernal FREQuency 2 44 SOURce 1 FM INTernal FUNCtion 2 45 SOURce 1 FM INTernal FUNCtion EFILe 2 46 SOURce 1 FM SOURCce 2 46 SOURce 1 FM STATe 2 47 SOURce 1 FM DEViation 2 44 SOURce 1 FREQuency CENTer 2 47 SOURce 1 FREQuency MODE 2 49 SOURce 1 FREQuency SPAN 2 50 SOURce 1 FREQuency STARt 2 50 SOURce 1 FREQuency STOP 2 51 SOURce 1 FREQuency CW FIXed 2 48 SOURce 1 FSKey INTernal RATE 2 52 SOURce 1 FSKey SOURce 2 53 SOURce 1 FSKey STATe 2 53 SOURce 1 FSKey FREQuency 2 52 SOURce 1 FUNCtion EFILe 2 54 SOURce 1 FUNCtion RAMP SYMMetry 2 54 SOURce 1 FUNCtion SHAPe 2 55 SOURce 1 PHASe ADJust 2 56 SOURce 1 PM INTernal FREQuency 2 57 SOURce 1 PM INTernal FUNCtion 2 58 SOURce 1 PM INTernal FUNCtion EFILe 2 59 Index 2 SOURce 1 PM
15. CH1 sweep mode to auto The instrument outputs a continuous sweep SOURce 1 SWEep RTIMe This command sets or queries the sweep return time Return time represents the amount of time from stop frequency through start frequency Return time does not include hold time Group Source Syntax SOURCe 1 SWEep RTIMe lt seconds gt MINimum MAXimum SOURCe 1 SWEep RTIMe MINimum MAXimum Arguments lt seconds gt lt NRf gt lt units gt where AFG2021 Arbitrary Function Generator Programmer Manual 2 71 Command Descriptions Returns Examples lt NRf gt is the return time in seconds lt units gt ns us ms s lt seconds gt SOURCe1 SWEep RTIMe 1ms sets the CH 1 return time to 1 ms SOURce 1 SWEep SPACing Group Syntax Arguments Returns Examples The SOURce 1 SWEep SPACing command selects linear or logarithmic spacing for the sweep for the specified channel The query command returns the type for the sweep spacing for the specified channel Source SOURCe 1 SwEep SPACing LINear LOGarithmic SOURcCe 1 SwEep SPACing LINear sets the sweep spacing to linear LOGarithmic sets the sweep spacing to logarithmic LIN LOG SOURCeL SWEep SPACing LINear sets the CH1 sweep spacing to linear SOURce 1 SWEep TIME Group 2 72 This command sets or queries the sweep time for the sweep for the specified channel The sweep time does not include hold time an
16. INTernal FREQuency N FUNCtion y EFILe y SOURce N DEPTh Ni BURSt MODE NCYCles TDELay STATe COMBine FEED NI FM INTernal FREQuency y FUNCtion y EFILe J L je je je SOURce STATe DEViation FREQuency CENTer MODE SPAN STARt STOP CW FlXed FSKey INTernal RATE SOURCce STATe FREQuency FUNCtion EFILe RAMP SYMMetry SHAPe J ADJust y L e e je je e jeje j2 L je e je e A 2 AFG2021 Arbitrary Function Generator Programmer Manual Appendix A SCPI Conformance Information Table A 1 SCPI conformance information cont Not Defined defined in SCPI in SCPI Command 1999 0 1999 0 PM INTernal FREQuency y FUNCtion J EFILe y SOURce N STATe NI DEViation Ni PULSe DCYCle DELay N HOLD y PERiod NI TRANsition TRAiling Ni LEADing N WIDTh N PWM INTernal FREQuency N FUNCtion y EFILe y SOURce Ni STATe NI DEViation DCYCle Ni SWEep HTIMe V MODE N RTIMe J SPACing TIME y VOLTage LIMit HIGH N LOW Ni UNIT Ni LEVel IMMediate HIGH y LOW N OFFSet 4 AMPLitude AFG2021 Arbitrary Function Generator Programmer Manual A 3 Appendix A SCPI Conform
17. PULSe WIDTh lt seconds gt MINimum MAXimum SOURce 1 PULSe WIDTh MINimum MAXimum Related Commands SOURce 1 PULSe DCYCle Arguments lt seconds gt lt NRf gt lt units gt where lt NRf gt is the pulse width lt units gt ns us ms s Returns lt seconds gt Examples SOURce1 PULSe WIDTh 200ns sets the CH 1 pulse width to 200 ns AFG2021 Arbitrary Function Generator Programmer Manual 2 65 Command Descriptions SOURce 1 PWM INTernal FREQuency Group Syntax Related Commands Arguments Returns Examples This command sets or queries the internal modulation frequency of PWM modulation for the specified channel You can use this command only when the internal modulation source is selected You can set the internal modulation frequency from 2 mHz to 50 00 kHz with resolution of 1 mHz You can select the source of modulating signal by using the SOURce 1 PWM SOURce INTernal EXTernal command Source SOURCe 1 PWM INTernal FREQuency lt frequency gt MINimum MAXimum SOURCe 1 PWM INTernal FREQuency MINimum MAXimum SOURce 1 PWM SOURce lt frequency gt lt NRf gt lt units gt where lt NRf gt is the modulation frequency lt units gt Hz kHz MHz lt frequency gt SOURCeL PWM INTernal FREQuency 10kHz sets the CH 1 internal frequency to 10 kHz SOURce 1 PWM INTernal FUNCtion 2 66 Group This command sets or queries the modulating
18. Register SBR should be set Operation Status Block This block is used to report on the status of several operations being executed by the instrument The block has three registers the Operation Condition Register OCR the Operation Event Register OEVR and the Operation Enable Register OENR Refer to the Operation Status Block shown in the previous figure See Figure 3 1 Operation Condition Register When the instrument achieves a certain status the corresponding bit is set to the OCR It is not allowed for the user to write to this register Operation Event Register The OCR bits that have changed from false reset to true set status are set in the OEVR Operation Enable Register The function of the OENR is to mask the OEVR You can set this mask and take AND with the OEVR to determine whether or not the OSS bit in the Status Byte Register SBR should be set Questionable Status Block This block reports on the status of signals and data such as the accuracy of entered data and signals generated by the instrument The register configuration and process flow are the same as the Questionable Status Block Registers The registers in the event reporting system fall into two functional groups m The Status Registers contain information about the status of the instrument m Enable Registers determine whether selected types of events are reported to the Status Registers and the Event Queue AFG2021 Arbitrary Function Gener
19. SOURCce 2 59 SOURce 1 PM STATe 2 60 SOURce 1 PM DEViation DCYCle 2 57 SOURce 1 PULSe DCY Cle 2 61 SOURce 1 PULSe DELay 2 62 SOURce 1 PULSe HOLD 2 63 SOURce 1 PULSe PERiod 2 63 SOURce 1 PULSe TRANsition TRAiling 2 64 SOURce 1 PULSe TRANsition LEA Ding 2 64 SOURce 1 PULSe WIDTh 2 65 SOURce 1 PWM INTernal FREQuency 2 66 SOURce 1 PWM INTernal FUNCtion 2 66 SOURce 1 PWM INTernal FUNCtion EFILe 2 67 SOURce 1 PWM SOURCce 2 68 SOURce 1 PWM STATe 2 68 SOURce 1 PWM DEViation DCY Cle 2 69 SOURce 1 SWEep HTIMe 2 70 SOURce 1 SWEep MODE 2 70 SOURce 1 SWEep RTIMe 2 71 SOURce 1 SWEep SPACing 2 72 SOURce 1 SWEep TIME 2 72 SOURce 1 WOLTage LIMit HIGH 2 76 SOURce 1 VOLTage LIMit LOW 2 76 SOURce 1 VOLTage UNIT 2 77 SOURce 1 WOLTage LE Vel IMMediate HIGH 2 73 SOURce 1 WOLTage LE Vel IMMediate LOW 2 74 SOURce 1 WOLTage LE Vel IMMediate OFF Set 2 74 SOURce 1 WOLTage LEVel IMMediate AMPLitude 2 75 SOURce lt 3 gt PO Wer LEVel MMediate AMPLitude 2 60 SRE 2 77 SRER 3 9 standard event status register 3 3 status byte register 3 4 status reporting structure 3 1 STATus OPERation CONDition 2 78 STATus OPERation ENABle 2 79 STATus OPERation EVENt 2 79 STATus PRESet 2 80 STATus QUEStionable CONDition 2 80 STATus QUEStionable ENABle 2 80 STATus QUEStionable EVENt 2 81 STB 2 81
20. Table 2 3 Query response examples Symbol Meaning SOURce PULSe DCY cle 50 0 OUTPut POLarity NORM Follow these general rules when entering commands Enter commands in upper or lower case m You can precede any command with white space characters White space characters include any combination of the ASCII control characters 00 through 09 and OB through 20 hexadecimal 0 through 9 and 11 through 32 decimal The instrument ignores commands that consists of just a combination of white space characters and line feeds SCPI Commands and Queries 2 4 The instrument uses a command language based on the SCPI standard The SCPI Standard Commands for Programmable Instruments standard was created by a consortium to provide guidelines for remote programming of instruments These guidelines provide a consistent programming environment for instrument control and data transfer This environment uses defined programming messages instrument responses and data formats that operate across all SCPI instruments regardless of manufacturer The SCPI language is based on a hierarchical or tree structure as shown in the following figure that represents a subsystem The top level of the tree is the root node it is followed by one or more lower level nodes TRIGger _ Root nodes SEQuence _ Lower level nodes SLOPe SOURce TiMer 0587 008 Figure 2 1 Example of SCPI subsystem hierarchy tree AFG2021 Arbitrar
21. bit is cleared when serial poll ends 3 4 AFG2021 Arbitrary Function Generator Programmer Manual Table 3 1 SBR bit functions cont Bit Function Status and Events 6 MSS Master Status Summary When the instrument is accessed using the STB query this bit is called the Master Status Summary MSS bit and indicates that the instrument has issued a service request for one or more reasons The MSS bit is never cleared to 0 by the STB query 5 ESB Event Status Bit This bit indicates whether or not a new event has occurred after the previous Standard Event Status Register SESR has been cleared or after an event readout has been performed 4 MAV Message Available Bit This bit indicates that a message has been placed in the output queue and can be retrieved 3 QSB 2 EQS Questionable Status Bit Error Event Queue Summary 1 0 lt Not used Standard Event Status Register SESR The SESR records eight types of events that can occur within the instrument as shown in the following figure 7 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE RQC OPC Figure 3 3 The Standard Event Status Register SESR AFG2021 Arbitrary Function Generator Programmer Manual 3 5 Status and Events Table 3 2 SESR bit functions Power On Indicates that the power to the instrument is on User Request Indicates that an application event
22. cannot overwrite or delete the setup file You cannot execute this command for the setup memory of location number 0 last setup memory AFG2021 Arbitrary Function Generator Programmer Manual 2 25 Command Descriptions Group Syntax Arguments Returns Examples Memory MEMory STATe LOCK 1 2 3 4 ON OFF lt NR1 gt MEMory STATe LOCK 1 2 3 4 1 2 3 or 4 specifies the setup memory to locked or queried ON or lt NR1 gt 0 locks the specified location of setup memory OFF or lt NR1 gt 0 allows you to overwrite or delete the specified location of setup memory lt NRI gt MEMORY STATE LOCK 1 ON locks the setup memory of location number 1 MEMory STATe RECall AUTo 2 26 Group Syntax Arguments Returns This command sets or queries whether to enable the automatic recall of last setup memory when powered on The next time you apply the power the instrument will automatically recall the settings you used when you powered off the instrument If you select OFF the default setups are recalled when you power on the instrument Memory MEMory STATe RECall AUTO ON OFF lt NR1 gt MEMory STATe RECal 1 AUTO OFF or lt NR1 gt 0 disables the last setup recall function ON or lt NR1 gt 0 enables the recall of the setup memory last used before the instrument was powered off lt NR1 gt AFG2021 Arbitrary Function Generator Programmer Manual Examples Command Descriptions ME
23. gt where lt NRf gt is the frequency deviation lt units gt Hz kHz MHz lt deviation gt SOURCe1 FM DEViation 1 0MHz sets the CH 1 frequency deviation to 1 0 MHz SOURce 1 FM INTernal FREQuency 2 44 This command sets or queries the internal modulation frequency of FM modulation for the specified channel You can use this command only when the internal modulation source is selected AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions You can set the internal modulation frequency from 2 mHz to 50 00 kHz with resolution of 1 mHz You can select the source of modulating signal by using the SOURce 1 FM SOURce INTernal EXTernal command Group Source Syntax SOURCe 1 FM INTernal FREQuency lt frequency gt MINimum MAXimum SOURcCe 1 FM INTernal FREQuency MINimum MAXimum Related Commands SOURce 1 FM SOURce Arguments lt frequency gt lt NRf gt lt units gt where lt NRf gt is the modulation frequency lt units gt Hz kHz MHz Returns lt frequency gt Examples SOURCe1 FM INTernal FREQuency 10kHz sets the CH 1 internal modulation frequency to 10 kHz SOURce 1 FM INTernal FUNCtion This command sets or queries the modulating waveform of FM modulation for the specified channel You can use this command only when the internal modulation source is selected If you specify EFILe when there is no EFILe or the EFILe is not yet defined t
24. has occurred The instrument does not use this bit Command Error Indicates that an error occurred while the instrument was parsing a command or query Bit Function 7 MSB PON 6 URQ 5 CME 4 EXE Execution Error Indicates that an error occurred while the instrument was executing a command or query Execution errors occur for one of the following reasons A value designated in the argument is outside the allowable range of the instrument or is in conflict with the capabilities of the instrument The command was not executed properly because the conditions for execution is differed from those required 3 6 AFG2021 Arbitrary Function Generator Programmer Manual Table 3 2 SESR bit functions cont Bit Function Status and Events 3 DDE Device Error An instrument error has been detected 2 QYE 1 RQC Query Error Indicates that a query error has been detected by the output queue controller Query errors occur for one of the following reasons An attempt was made to retrieve messages from the output queue when the output queue is empty or in pending status The output queue message was cleared while it was being retrieved from the output queue Request Control The instrument does not use this bit 0 OPC Operation Complete Indicates that the operation is complete This bit is set when all pending operations complete followi
25. instrument then returns the result of the calibration A command message is a command or query name followed by any information the instrument needs to execute the command or query Command messages consist of five element types AFG2021 Arbitrary Function Generator Programmer Manual Command Syntax Table 2 2 Command message elements Symbol Meaning lt Header gt The basic command name If the header ends with a question mark the command is a query The header may begin with a colon character if the command is concatenated with other commands the beginning colon is required The beginning colon can never be used with command headers beginning with a star lt Mnemonic gt A header subfunction Some command headers have only one mnemonic If a command header has multiple mnemonics they are always separated from each other by a colon character lt Argument gt A quantity quality restriction or limit associated with the header Not all commands have an argument while other commands have multiple arguments Arguments are separated from the header by a lt Space gt Arguments are separated from each other by a lt Comma gt lt Comma gt A single comma between arguments of multiple argument commands It may optionally have white space characters before and after the comma lt Space gt A white space character between command header and argument It may optionally consist of multiple white space chara
26. locks a file or directory in the mass storage system OFF or lt NR1 gt 0 allows you to overwrite or delete a file or directory in the mass storage system lt NR1 gt MMEMORY LOCK STATE SETUP1 TFS ON locks the file SETUP1 TFS MMEMory MDiRectory No Query Form Group Syntax 2 30 This command creates a directory in the mass storage system If the specified directory is locked in the mass storage system this command causes an error Mass Memory MMEMory MDIRectory lt directory_name gt AFG2021 Arbitrary Function Generator Programmer Manual Arguments Examples Command Descriptions lt directory_name gt lt string gt specifies a directory name to be created MMEMORY MDIRECTORY SAMPLE1 creates a directory named SAMPLE1 in the mass storage system MMEMory STORe STATe No Query Form Group Syntax Related Commands Arguments Examples This command copies a setup file in the setup memory to a specified file in the mass storage system If the specified file in the mass storage system is locked this command causes an error You cannot create a new file if the directory is locked If the setup memory is deleted this command causes an error The lt file_name gt argument is a quoted string that defines the file name and path Mass Memory MMEMory STORe STATe 1 2 3 4 lt file_name gt MMEMory LOAD STATe MMEMory LOCK STATe 1 2 3 or 4 specifies the location o
27. lt NR 1 gt is a value in the range from 0 through 255 The binary bits of the SRER are set according to this value Using an out of range value causes an execution error The power on default for SRER is 0 if PSC is set to 1 If PSC is set to 0 the SRER maintains the previous power cycle value through the current power cycle lt bit_value gt SRE48 sets the bits in the SRER to binary 00110000 SRE might return 32 showing that the bits in the SRER have the binary value of 00100000 STATus OPERation CONDition Query Only Group Syntax Arguments Returns 2 78 This query only command returns the contents of the Operation Condition Register Status STATUS OPERation CONDition None lt bit_value gt lt NR1 gt AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Examples STATUS OPERATION CONDITION might return 32 which indicates that the OCR contains the binary number 00000000 00100000 and the CH 1 of the instrument is waiting for trigger STATus OPERation ENABle This command sets or queries the mask for the Operation Enable Register Group Status Syntax STATus OPERation ENABle lt bit_value gt STATUS OPERation ENAB le Arguments lt bit_value gt lt NRI gt Returns lt bit_value gt Examples STATUS OPERATION ENABLE 1 sets the CALibrating bit in the OENR to on STATus OPERation EVENt Query Only This query only command returns the value in
28. set the ESB in the SBR when the SESR bit has been set set the ESER bit corresponding to that event To prevent the ESB from being set reset the ESER bit corresponding to that event Use the ESC command to set the bits in the ESER Use the ESR query to read the contents of the ESER The following figure shows the ESER functions 7 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE RQC OPC Figure 3 6 Event Status Enable Register ESER Service Request Enable Register SRER The SRER consists of bits defined exactly the same as bits 0 through 7 in the SBR You can use this register to define which events will generate service requests AFG2021 Arbitrary Function Generator Programmer Manual 3 9 Status and Events Queues The SRER bit 6 cannot be set Also the RQS is not maskable The generation of a service request with the GPIB interface involves changing the SRQ line to LOW and making a service request to the controller The result is that a status byte for which an RQS has been set is returned in response to serial polling by the controller Use the SRE command to set the bits of the SRER Use the SRE query to read the contents of the SRER Bit 6 must be set to 0 The following figure shows the SRER functions 6 7 RQS 5 4 3 2 1 0 OSB g ESB MAV QSB EQ QS MSS Figure 3 7 Service Request Enable Register SRER Operati
29. ships with this instrument AFG2021 Arbitrary Function Generator Specifications and Performance Verification Technical Reference The technical reference provides information on instrument specifications and procedures for performance verification AFG2021 Arbitrary Function Generator Service Manual The service manual includes procedures to service the instrument to the module level The manual also includes adjustment procedures theory of operation information and a list of replaceable parts AFG2021 Arbitrary Function Generator Programmer Manual iii Preface iv AFG2021 Arbitrary Function Generator Programmer Manual Getting Started Getting Started To help you get started with programming the instrument this section includes the following subsections B Overview of the Manual Summarizes each major section of this manual Connecting the Interface Describes how to physically connect the instrument to a controller Using GPIB Port Describes how to use the GPIB port Setting the GPIB Address Describes how to set the GPIB parameters from the front panel m Using TekVISA Describes how to use the Tek VISA communication protocol Overview of the Manual Syntax and Commands The information contained in each major section of this manual is described below Syntax and Commands describes the structure and content of the messages your program sends to the instrument The following figure shows command parts as descri
30. the Operation Event Register and clears the Operation Event Register Group Status Syntax STATus OPERation EVENt Arguments None Returns lt NR1 gt Examples STATUS OPERATION EVENT might return 1 which indicates that the OEVR contains the binary number 00000000 00000001 and the CA Librating bit is set to on AFG2021 Arbitrary Function Generator Programmer Manual 2 79 Command Descriptions STATus PRESet No Query Form Group Syntax Arguments Examples This command presets the SCPI status registers OENR and QENR Status STATUS PRESet None STATUS PRESET presets the SCPI status registers STATus QUEStionable CONDition Query Only Group Syntax Arguments Returns Examples This query only command returns the contents of the Questionable Condition Register Status STATUS QUEStionable CONDition None lt bit_value gt lt NR1 gt STATUS QUESTIONABLE CONDITION might return 32 which indicates that the QCR contains the binary number 00000000 00100000 and the accuracy of frequency is questionable STATus QUEStionable ENABle Group 2 80 This command sets or queries the mask for the Questionable Enable Register Status AFG2021 Arbitrary Function Generator Programmer Manual Syntax Arguments Returns Examples Command Descriptions STATUS QUEStionable ENABle lt bit_value gt STATUS QUEStionable ENABle lt bit_value gt lt NR1 gt lt b
31. the shape of modulating waveform for the CH 1 output SOURce 1 AM INTernal FUNCtion EFILe This command sets or queries an EFILe name used as a modulating waveform for AM modulation A file name must be specified in the mass storage system This command returns if there is no file in the mass storage AFG2021 Arbitrary Function Generator Programmer Manual 2 39 Command Descriptions Group Syntax Arguments Returns Examples Source SOURCe 1 AM INTernal FUNCtion EFILe lt file_name gt SOURCe 1 AM INTernal FUNCtion EFILe lt file_name gt lt string gt specifies a file name in the mass storage system The lt file_name gt includes path Path separators are forward slashes lt file_name gt SOURCe1 AM INTernal FUNCtion EFILe SAMPLEL sets a file named SAMPLE1 in the mass storage SOURce 1 AM SOURce Group Syntax Arguments Returns Examples This command sets or queries the source of modulating signal of AM modulation for the specified channel Source SOURCe 1 AM SOURCe INTernal ExXTernal SOURCe 1 AM SOURCe INTernal means that the carrier waveform is modulated with an internal source EXTernal means that the carrier waveform is modulated with an external source INT EXT SOURCe1 AM SOURCe INTernal sets the CH 1 source of modulating signal to internal SOURce 1 AM STATe 2 40 This command enables or disables AM modulation for
32. the waveform data in the user waveform memory USER to the edit memory This command transfers the waveform data from the external controller to the edit memory in the instrument The query command returns the binary block data Trace TRACe DATAL DATA EMEMory lt binary_block_data gt TRACe DATA DATA lt binary_block_data gt where lt binary_block_data gt is the waveform data in binary format lt binary_block_data gt AFG2021 Arbitrary Function Generator Programmer Manual 2 89 Command Descriptions Examples DATA DATA EMEMory 42000 lt DAB gt lt DAB gt lt DAB gt transmits a waveform to the edit memory in the instrument The block data element 42000 indicates that 4 is the number of digits in 2000 byte count and the 2000 bytes of binary data are to be transmitted TRACe DATA DATA LINE No Query Form Group Syntax Arguments Examples 2 90 This command writes line data to the edit memory The data between the specified points is interpolated linearly Trace TRACe DATAL DATA LINE EMEMory lt start_point gt lt point_datal gt lt end_point gt lt point_data2 gt lt start_point gt lt NR1 gt where lt NR1 gt is the first point from which the data is interpolated linearly lt point_datal gt lt NR1 gt where lt NR1 gt is the data value at the start point lt end_point gt lt NR1 gt where lt NRI gt is the last point from which the data is interpo
33. voltage gt AFG2021 Arbitrary Function Generator Programmer Manual Examples Command Descriptions SOURCe1 VOLTage LIMit LOW 10mv sets the lower limit of CH 1 output amplitude to 10 mV SOURce 1 VOLTage UNIT Group Syntax Related Commands Arguments Returns Examples SRE This command sets or queries the units of output amplitude for the specified channel This command does not affect the offset High level or Low level of output The setting of this command is not affected by the units setting of SOURce 1 VOLTage LE Vel IMMediate AMPLitude command V rms pug sin P dBm 10 x log au p Vow Rr Ry loadimpedance Vims Yep triangle 2 3 Source SOURCe 1 VOLTage UNIT vPP VRMS DBM SOURce 1 VOLTage UNIT SOURce 1 WOLTage LEVel MMediate AMPLitude VPP sets the units of the output voltage to Vp p VRMS sets the units of the output voltage to Vrms DBM sets the units of the output voltage to dBm You cannot specify DBM if the load impedance is set to infinite VPP VRMS DBM SOURCe1 VOLTage UNIT VPP sets the voltage units to Vp p This command sets and queries the bits in the Service Request Enable Register SRER AFG2021 Arbitrary Function Generator Programmer Manual 2 77 Command Descriptions Group Syntax Related Commands Arguments Returns Examples Status SRE lt bit_value gt SRE PSC lt bit_value gt lt NR1 gt where
34. waveform of PWM modulation for the specified channel You can use this command only when the internal modulation source is selected If you specify EFILe when there is no EFILe or the EFILe is not yet defined this command causes an error Source AFG2021 Arbitrary Function Generator Programmer Manual Syntax Related Commands Arguments Returns Examples Command Descriptions SOURCe 1 PWM INTernal FUNCtion SINusoid SQuare TRIangle RAMP NRAMp PRNOise USER 1 USER2 USER3 USER4 EMOMory EFILe SOURCe 1 PWM INTernal FUNCtion SOURce 1 PWM SOURce SINuSoid SQUare TRIangle RAMP NRAMp PRNoise One of six types of function waveform can be selected as a modulating signal USER 1 USER2 USER3 USER4 EMEMory A user defined waveform saved in the user waveform memory or the EMEMory can be selected as a modulating signal EFILe EFILe is used as a modulating signal SIN SQU TRI RAMP NRAM PRN USER1 USER2 USER3 USER4 EMOMory EFILe SOURCe1 PWM INTernal FUNCtion SQUare selects Square as the shape of modulating waveform for the CH 1 output SOURce 1 PWM INTernal FUNCtion EFlLe Group Syntax Arguments Returns This command sets or queries an EFILe name used as a modulating waveform for PWM modulation A file name must be specified in the mass storage system This command returns if there is no file in the mass storage Source SOURCe 1 PWM INTernal FUNCti
35. 1 SWEep MODE Set query sweep mode SOURce 1 SWEep RTIMe Set query sweep return time SOURce 1 SWEep SPACing Set query sweep spacing SOURce 1 SWEep TIME Set query sweep time SOURce 1 VOLTage LIMit HIGH Set query output amplitude upper limit SOURce 1 VOLTage LIMit LOW Set query output amplitude lower limit SOURce 1 VOLTage UNIT Set query output amplitude units SOURce 1 VOLTage LEVel IMMediate HIGH Set query output amplitude high level SOURce 1 VOLTage LEVel IMMediate LOW Set query output amplitude low level SOURce 1 VOLTage LEVel IMMediate OFFSet Set query output offset voltage SOURce 1 VOLTage LEVel IMMediate AMPLitude Set query output amplitude SOURce lt 3 gt POWer LE Vell MMediate AMPLitude Set query internal noise level Status Commands Status commands let you determine the status of the instrument The following table lists and describes the Status commands Table 2 12 Status commands Header Description CLS Clear all event registers and queues ESE Set query standard event status enable register ESR Return standard event status register PSC Set query power on status clear SRE Set query service request enable register AFG2021 Arbitrary Function Generator Programmer Manual Table 2 12 Status commands cont Header Command Groups Descriptio
36. 1 PHASe ADJust MAXimum sets the maximum value for the phase of CH 1 output frequency SOURce 1 PM DEViation DCYCle Group Syntax Arguments Returns Examples This command sets or queries the peak frequency deviation of PM modulation for the specified channel Source SOURCe 1 PM DEViation DCYCle lt deviation gt MINimum MAXimum SOURce 1 PM DEViation DCYCle MINimum MAXimum lt deviation gt lt NR3 gt lt units gt where lt NR3 gt is the phase deviation lt units gt RAD DEG If lt units gt are omitted RAD is specified automatically The setting ranges are RAD 0 PI to 1 PI relative to phase value DEG 0 to 180 in 0 1 degree steps relative to phase value lt deviation gt SOURCe1 PM DEViation DCYCle MAXimum sets the maximum value for the CH 1 phase deviation SOURce 1 PM INTernal FREQuency This command sets or queries the internal modulation frequency of PM modulation for the specified channel You can use this command only when the internal modulation source is selected You can set the internal modulation frequency from 2 mHz to 50 00 kHz with resolution of 1 mHz AFG2021 Arbitrary Function Generator Programmer Manual 2 57 Command Descriptions Group Syntax Related Commands Arguments Returns Examples You can select the source of modulating signal by using the SOURce 1 PM SOURce INTernal EXTernal command Source SOURCe 1 PM INTe
37. 1 000 000 INFinity sets the burst count to infinite count MINimum sets the burst count to minimum count MAXimum sets the burst count to maximum count lt cycles gt SOURCe1 BURSt NCYCles 2 sets the CH 1 burst count to 2 SOURce 1 BURSt STATe Group Syntax Arguments Returns Examples 2 42 This command enables or disables the burst mode for the specified channel The query command returns the state of burst mode Source SOURCe 1 BURSt STATe 0N OFF lt NR1 gt SOURCe 1 BURSt STATe ON or lt NR1 gt 0 enables the burst mode OFF or lt NR1 gt 0 disables the burst mode lt NR1 gt SOURCe1 BURSt STATe ON enables the burst mode for the CH 1 AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions SOURce 1 BURSt TDELay Group Syntax Arguments Returns Examples This command sets or queries delay time in the burst mode for the specified channel It specifies a time delay between the trigger and the signal output This command is available only in the Triggered burst mode The setting range is 0 0 ns to 85 000 s with resolution of 100 ps or 5 digits Source SOURCe 1 BURSt TDELay lt delay gt MINimum MAXimum SOURce 1 BURSt TDELay MINimum MAXimum lt delay gt lt NRf gt lt units gt where lt units gt s ms us ns MINimum sets the delay time to minimum value MAXimum sets the delay time to maximum value lt
38. 1 gt is the number of points for the waveform data in the edit memory that ranges from 2 to 131072 If the second parameter in the argument is a numerical value the length of the edit memory will be the number of points specified by this number and each point will be initialized to the default value 8191 lt trace_name gt SINusoid SQUare PULSe RAMP NOISe If the second parameter in the argument is specified by lt trace_name gt the specified waveform data will be copied to the edit memory The number of points for the specified waveform data is equal to the number of points for one period of current waveform data in the edit memory If the lt points gt and lt trace_name gt parameters in the argument are omitted the edit memory will be initialized to the default number of points 1000 and value 8191 DATA DEFine EMEMory 1000 sets the length of the edit memory to 1000 points and resets the data points to the default value TRACe DATA DELete NAME No Query Form Group Syntax Arguments Examples This command deletes the contents of specified user waveform memory Trace TRACe DATA DELete NAME lt trace_name gt lt trace_name gt USER 1 USER2 USER3 USER4 This command is invalid when lt trace_name gt is being output or lt trace_name gt is locked DATA DELete NAME USERI deletes the contents of USER1 waveform memory TRACe DATA LOCK STATe 2 92 This command sets or quer
39. 3 Init ignored 214 Trigger deadlock 215 Arm deadlock 220 Parameter error 221 Settings conflict 222 Data out of range 223 Too much data AFG2021 Arbitrary Function Generator Programmer Manual 3 13 Status and Events Table 3 7 Execution error messages cont Error code Error message 224 Illegal parameter value 225 Out of memory 226 Lists not same length 230 Data corrupt or stale 231 Data questionable 232 Invalid format 233 Invalid version 240 Hardware error 241 Hardware missing 250 Mass storage error 251 Missing mass storage 252 Missing media 253 Corrupt media 254 Media full 255 Directory full 256 File name not found 257 File name error 258 Media protected 260 Expression error 261 Math error in expression 270 Macro error 271 Macro syntax error 272 Macro execution error 273 Illegal macro label 274 Macro parameter error 275 Macro definition too long 276 Macro recursion error 277 Macro redefinition not allowed 278 Macro header not found 280 Program error 281 Cannot create program 282 Illegal program name 283 Illegal variable name 284 Program currently running 285 Program syntax error 286 Program runtime error 290 Memory use error AFG2021 Arbitrary Function Generator Programmer Manual Device Specific Errors Query Errors Status and Events
40. A is industry compliant software available with selected Tektronix instruments You can use this software to write or draw interoperable instrument drivers in a variety of Application Development Environments ADEs It implements a subset of Version 2 2 of the VISA specification for controlling GPIB and serial RS 232 instrument interfaces locally or remotely via an Ethernet LAN connection Installation Use an internet browser to access the Tektronix Web site www tektronix com and download the current Tek VISA to your PC Unzip the downloaded file in a temporary directory of your choice and run Setup exe NOTE The details on TekVISA concepts and operations are explained in the TekVISA Programmer Manual that can be also found on the Tektronix Web site AFG2021 Arbitrary Function Generator Programmer Manual 1 5 Getting Started 1 6 AFG2021 Arbitrary Function Generator Programmer Manual Syntax and Commands Syntax and Commands This section provides the following information Command Syntax defines the command syntax and processing conventions Command Groups describes command groups which lists the commands by function Command Descriptions describes the notation of each of the commands in alphabetical order AFG2021 Arbitrary Function Generator Programmer Manual 2 1 Command Syntax Command Syntax You can control the operations and functions of the instrument through the GPIB interface using commands and qu
41. AFG2021 Arbitrary Function Generator Programmer Manual IANA A Tektronix 077 0587 01 AFG2021 Arbitrary Function Generator Programmer Manual www tektronix com Tektronix 077 0587 01 S Copyright Tektronix All rights reserved Licensed software products are owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc Contacting Tektronix Tektronix Inc 14150 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Table of Contents PHEPACE eiacds na bs cadcacdebbpunkiadihiecaatddadabliasddevien tallshigcadial naseddunid caiaddehonidulodetassadeadaghiien iii Doc ment ti oaeee e o e E r EE T T E T O A iii Getting Started Getting Started seese eE EE E EEE E E snneciosionses 1 1 Overview of the Manual 22 2 0 00 ccc cece enn enn nnn EE EEE EE enn EE enn EE EES 1 1 Connecting the Interface 2ssascceiedesen ence tia saseceuedes sauna ceblalsaesnsenes TE ig OE TNO 1 2 Using the GPIB Pott o
42. Command Descriptions lt units gt Hz kHz MHz Returns lt frequency gt Examples SOURCe1l FREQuency FIxXed 500kHz sets the CH 1 output frequency to 500 kHz when the Run Mode is set to other than Sweep SOURce 1 FREQuency MODE This command sets or queries the frequency sweep state You can select sine square ramp or arbitrary waveform for sweep The instrument automatically changes to the Continuous mode if any waveform is selected other than sine square ramp or an arbitrary waveform Group Source Syntax SOURCe 1 FREQuency MODE cw FIXed Sweep SOURCe 1 FREQUency MODE Related Commands SOURce 1 FREQuency CW FIXed SOURce 1 FREQuency CENTer SOURce 1 FREQuency SPAN SOURce 1 FREQuency STARt SOURce 1 FREQuency STOP Arguments CW FIXed means that the frequency is controlled by the SOURce 1 FREQuency CW FIXed command The sweep is invalid SWEep means that the output frequency is controlled by the sweep command set The sweep is valid Returns CW FIXed SwEep Examples SOURCe1 FREQuency MODE SWEep specifies the sweep command set for controlling the CH 1 output frequency AFG2021 Arbitrary Function Generator Programmer Manual 2 49 Command Descriptions SOURce 1 FREQuency SPAN Group Syntax Related Commands Arguments Returns Examples This command sets or queries the span of frequency sweep for the specified channel This command is always used with the
43. MORY STATE RECALL AUTO ON sets the instrument to recall the last setup memory when powered on MEMory STATe VALid Query Only Group Syntax Arguments Returns Examples MMEMory CATalog Group Syntax Related Commands Arguments Returns AFG2021 Arbitrary Function Generator Programmer Manual This command returns the availability of a setup memory Memory MEMory STATe VALid 1 2 3 4 1 2 3 or 4 specifies the location of setup memory lt NR1 gt 1 means that the specified setup memory has been saved 0 means that the specified setup memory has been deleted MEMORY STATE VALID 1 might return 1 if the specified setup memory has been saved Query Only This query only command returns the current state of the mass storage system USB memory Mass Memory MMEMory CATalog MMEMory CDIRectory None lt NR1 gt lt NR1 gt lt file_name gt lt file_type gt lt file_size gt where 2 27 Command Descriptions MMEMory CDiRectory Examples Group Syntax Arguments Returns Examples The first lt NR1 gt indicates that the total amount of storage currently used in bytes The second lt NR1 gt indicates that the free space of mass storage in bytes lt file_name gt is the exact name of a file lt file_type gt is DIR for directory otherwise it is blank lt file_size gt is the size of the file in bytes MMEMORY CATALOG might return the following response 32751616
44. N OFF lt NR1 gt DISPlay SAVer STATe Related Commands _DISPlay SAVer MMediate Arguments ON or lt NR1 gt 0 enables the screen saver function OFF or lt NR1 gt 0 disables the screen saver function AFG2021 Arbitrary Function Generator Programmer Manual 2 21 Command Descriptions Returns Examples lt NR1 gt indicating the screen saver state DISPLAY SAVER STATE OFF disables the screen saver function DISPlay WINDow TEXT DATA Group Syntax Arguments Returns Examples The DISPlay WINDow TEXT DATA command displays a text message on the instrument screen The DISPlay WINDow TEXT DATA query returns the text string currently displayed on the instrument screen The displayable characters are ASCII codes 32 through 126 and the instrument can display approximately 64 characters Display DISPlay WINDow TEXT DATA lt string gt DISPlay WINDow TEXT DATA lt string gt lt string gt which is the currently displayed text message DISPLAY WINDOW TEXT DATA returns the currently displayed text message DISPlay WINDow TEXT CLEar No Query Form Group Syntax 2 22 This command clears the text message from the display screen Display DISPlay WINDow TEXT CLEar AFG2021 Arbitrary Function Generator Programmer Manual Arguments Examples ESE Group Syntax Related Commands Arguments Returns Examples ESR Query
45. NR2 or NR3 examples string 4 Alphanumeric characters must Testing 1 2 3 be within quotation marks 1 Defined in ANSI IEEE 488 2 as Definite Length Arbitrary Block Response Data 2 An ANSI IEEE 488 2 1992 defined parameter type 3 Some commands and queries will accept an octal or hexadecimal value even though the parameter type is defined as NR1 4 Defined in ANSI IEEE 488 2 as String Response Data Special Characters The Line Feed LF character or the New Line NL character ASCII 10 and all characters in the range of ASCII 127 255 are defined as special characters These characters are used in arbitrary block arguments only using these characters in other parts of any command yields unpredictable results Abbreviating Commands You can abbreviate most SCPI commands queries and parameters to an accepted Queries and Parameters short form This manual shows these short forms as a combination of upper and lower case letters The upper case letters indicate the accepted short form of a command As shown in the following figure you can create a short form by using only the upper case letters The accepted short form and the long form are equivalent and request the same action of the instrument Long form of a command SOURce1 FREQuency 100 Minimum information needed for accepted short form Accepted short form SOUR1 4 100 of a command 0587 005 Figure 2 2 Example of abbreviating a command 2 6 AFG2021 Arb
46. Nimum MAXimum SOURCe 1 VOLTage LEVel IMMediate AMPLitude MINimum MAXi mum Arguments lt amplitude gt lt NRf gt lt units gt where lt NRf gt is the output amplitude lt units gt VPP VRMS DBM Returns lt amplitude gt Examples SOURCe1 VOLTage LEVel IMMediate AMPLitude 1v sets the CH loutput amplitude to 1 V AFG2021 Arbitrary Function Generator Programmer Manual 2 75 Command Descriptions SOURCce 1 VOLTage LIMit HIGH Group Syntax Arguments Returns Examples This command sets or queries the higher limit of the output amplitude high level for the specified channel Source SOURCe 1 VOLTage LIMit HIGH lt voltage gt MINimum MAXimum SOURCe 1 VOLTage LIMit HIGH MINimum MAXimum lt voltage gt lt NRf gt lt units gt where lt NRf gt is the higher limit of output amplitude lt units gt mV V lt voltage gt SOURCe1 VOLTage LIMit HIGH 1V sets the higher limit of CH 1 output amplitude to 1 V SOURce 1 VOLTage LIMit LOW Group Syntax Arguments Returns 2 76 This command sets or queries the lower limit of the output amplitude low level for the specified channel Source SOURCe 1 VOLTage LIMit LOW lt voltage gt MINimum MAXimum SOURCe 1 VOLTage LIMit LOW MINimum MAXimum lt voltage gt lt NRf gt lt units gt where lt NRf gt is the lower limit of output amplitude lt units gt mV V lt
47. OUR EXT Identical root and lower level nodes TRIG SEQ TIM 2 5 SLOP POS SOUR EXT Leol Firstcommand Additional commands omitted the root nodes era Figure 2 4 Example of omitting root and lower level nodes in a chained message Unit and SI Prefix Ifthe decimal numeric argument refers to amplitude frequency or time you can express it using SI units instead of using the scaled explicit point input value format lt NR3 gt SI units are units that conform to the Systeme International d Unites standard For example you can use the input format 200 mV or 1 0 MHz instead of 200 0E 3 or 1 0E 6 respectively to specify voltage or frequency AFG2021 Arbitrary Function Generator Programmer Manual 2 7 Command Syntax The following table lists the available units Table 2 5 Available units Symbol Meaning dB decibel relative amplitude dBm decibel absolute amplitude DEG degree phase Hz hertz frequency PCT percent S second time V volt You can omit a unit in a command but you must include the unit when using a SI prefix For example frequency of 15 MHz can be described as follows 15 0E6 1 5E7Hz 15000000 15000000Hz 15MHz etc 15M is not allowed General rules for using Here are three general rules for using SCPI commands queries and parameters SCPI commands 66 99 You can use single or double quotation marks for quoted strings but you cannot use
48. Only Command Descriptions None DISPLAY WINDOW TEXT CLEAR clears the text message from the screen This command sets or queries the bits in the Event Status Enable Register ESER used in the status and events reporting system of the instrument The query command returns the contents of the ESER Status ESE lt bit_value gt ESE CLS ESR PSC SRE STB lt bit_value gt lt NR1 gt where lt NRI1 gt is a value in the range of 0 through 255 The binary bits of the ESER are set according to this value lt bit_value gt ESE 177 sets the ESER to 177 binary 10110001 which sets the PON CME EXE and OPC bits ESE might return 186 indicating that the ESER contains the binary value 10111010 This query only command returns the contents of the Standard Event Status Register SESR used in the status events reporting system in the instrument ESR also clears the SESR since reading the SESR clears it AFG2021 Arbitrary Function Generator Programmer Manual 2 23 Command Descriptions Group Syntax Related Commands Arguments Returns Examples Status ESR CLS ESE SRE STB None lt NR1 gt indicates that the contents of the SESR as a decimal integer ESR might return 181 which indicates that the SESR contains the binary number 10110101 HCOPy SDUMp IMMediate No Query Form Group Syntax Arguments Examples IDN Query Only Group
49. Operation Status Block Waiting for TRIGger CH1 ally hed Waiting for TRIGger CH2 Output Queue STATus OPERation ENABle lt bit_value gt STATus OPERation EVENt STATus OPERation CONDition Operation Complete gt Request Control Query Error Device Dependent Error Execution Error Command Error e HHT S m H HMHM User Request Power on E I Error andEvent SESR ESER Status Block ESR ESEcbit value gt TA ae Register SBR SRER STB SRE lt bit_value gt SRE Figure 3 1 Error and event handling process Standard Event Status This block is used to report power on off command error and command Block execution status The block has two registers the Standard Event Status Register SESR and the Event Status Enable Register ESER Refer to the Standard Event Status Block shown at the bottom of the previous figure See Figure 3 1 3 2 AFG2021 Arbitrary Function Generator Programmer Manual Status and Events Standard Event Status Register The SESR is an eight bit status register When an error or other type of event occurs on the instrument the corresponding bit is set You cannot write to this register Event Status Enable Register The ESER is an eight bit enable register that masks the SESR You can set this mask and take AND with the SESR to determine whether or not the ESB bit in the Status Byte
50. SOURce 1 FREQuency CENTer command The setting range of frequency span depends on the waveform selected for sweep Source SOURCe 1 FREQuency SPAN lt frequency gt MINimum MAXi mum SOURCe 1 FREQuency SPAN MINimum MAXimum SOURce 1 FREQuency CENTer SOURce 1 FREQuency MODE lt frequency gt lt NRf gt lt units gt where lt NRf gt is the frequency span lt units gt Hz kHz MHz lt frequency gt SOURCe1L FREQuency SPAN 900 kHz sets the CH 1 frequency span to 900 kHz SOURce 1 FREQuency STARt 2 50 Group Syntax Related Commands This command sets or queries the start frequency of sweep for the specified channel This command is always used with the SOURce 1 FREQuency STOP command The setting range of start frequency depends on the waveform selected for sweep For more information on the setting range refer to the specifications page of Quick Start User Manual Source SOURCe 1 FREQuency STARt lt frequency gt MINimum MAXimum SOURCe 1 FREQuency STARt MINimum MAXimum SOURce 1 FREQuency MODE SOURce 1 FREQuency STOP AFG2021 Arbitrary Function Generator Programmer Manual Arguments Returns Examples Command Descriptions lt frequency gt lt NRf gt lt units gt where lt NRf gt is the start frequency lt units gt Hz kHz MHz lt frequency gt SOURCeL FREQuency STARt 10kHz sets the sweep start frequency of CH 1 to 10 kHz
51. Synchronization Commands Synchronization commands let you synchronize the operation of the instrument The following table lists and describes the Synchronization commands Table 2 14 Synchronization commands Header Description OPC Set query operation complete WAI Wait to continue AFG2021 Arbitrary Function Generator Programmer Manual 2 15 Command Groups 2 16 Trace Commands Trace commands let you set the edit memory and user waveform memory The following table lists and describes the Trace commands Table 2 15 Trace commands Header Description TRACe DATA CATalog Return user waveform memory status TRACe DATA COPY Copy edit memory or user waveform memory content to user waveform memory or edit memory TRACe DATA DATA Set query waveform data to edit memory TRACe DATAY DATA LINE Write waveform data with interpolation TRACe DATA DATA VALue Set query waveform data in edit memory TRACe DATA DEFine Set edit memory content TRACe DATA DELete NAME Delete user waveform memory contents TRACe DATA LOCK STATe Set query lock unlock of user waveform memory TRACe DATA POINts Set query number of points for waveform data in edit memory Trigger Commands Trigger commands let you control all aspects of instrument triggering The following table lists and describes the Trigger commands Table 2 16 Trigger commands Header Description ABORt Initialize trigger
52. al calibration and returns 0 Pass or a calibration error code NOTE The self calibration can take several minutes to complete During this time the instrument does not execute any commands Do not power off the instrument during the self calibration AFG2021 Arbitrary Function Generator Programmer Manual 2 17 Command Descriptions Group Syntax Related Commands Arguments Returns Examples CALibration ALL Group Syntax Related Commands Arguments 2 18 Calibration and Diagnostic CAL CALibration ALL None lt NR1 gt where lt NR1 gt 0 indicates that the internal calibration completed without errors lt NR1 gt 0 indicates that the instrument detected an error CAL performs an internal calibration and returns results For example it might return 0 which indicates that the calibration completed without any errors The CALibration ALL command performs an internal calibration The CALibration ALL command performs an internal calibration and returns 0 Pass or a calibration error code NOTE The self calibration can take several minutes to complete During this time the instrument does not execute any commands Do not power off the instrument during the self calibration Calibration and Diagnostic CALibration ALL CALibration ALL CAL None AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Returns lt NR1 gt where
53. ance Information Table A 1 SCPI conformance information cont Not Defined defined in SCPI in SCPI Command 1999 0 1999 0 SOURce lt 3 gt POWer LEVel IMMediate AMPLitude STATus OPERation EVENt N CONDition N ENABle Ni PRESet N QUEStionable EVENt N CONDition N ENABle N SYSTem BEEPer STATe N IMMediate Ni ERRor NEXT NI KCLick STATe y KLOCk STATe y PASSword CDISable N CENable Ni STATe N NEW Ni SECurity IMMediate Ni ULANguage N VERSion y TRACe DATA CATalog y COPY N DATA V LINE Ni VALue Ni DEFine Ni DELete NAME Ni LOCK STATe y POINts y TRIGger SEQuence SLOPe SOURCce A 4 AFG2021 Arbitrary Function Generator Programmer Manual Appendix A SCPI Conformance Information Table A 1 SCPI conformance information cont Not Defined defined in SCPI in SCPI Command 1999 0 1999 0 TIMer N IMMediate Ni CAL Ni CLS N ESE Ni ESR NI IDN N OPC Ni OPT Ni PSC Ni RCL Ni RST N SAV N SRE NI STB Ni TRG N TST Ni WAI AFG2021 Arbitrary Function Generator Programmer Manual A 5 Appendix A SCPI Conformance Information A 6 AFG2021 Arbitrary Function Generator Programmer Manual Index A ABORt 2 17 C CAL 2 17 CALibration ALL 2 18 CLS 2 19 comm
54. and errors 3 12 Command Groups 2 11 D device errors 3 16 device specific errors 3 15 DIAGnostic ALL 2 19 DISPlay BRIGhtness 2 20 DISPlay SAVer IMMediate 2 21 DISPlay SAVer STATe 2 21 DISPlay WINDow TEXT CLEar 2 22 DISPlay WINDow TEXT DATA 2 22 E error event queue 3 11 ESE 2 23 ESER 3 9 ESR 2 23 event status enable register 3 3 execution errors 3 13 H HCOPy SDUMp IMMediate 2 24 IDN 2 24 MEMory STATe DELete 2 25 MEMory STATe LOCK 2 25 MEMory STATe RECall AUTOo 2 26 MEMory STATe VA Lid 2 27 messages and codes 3 11 MEMory CATalog 2 27 MEMory CDIRectory 2 28 EMory DELete 2 28 EMory LOAD STATe 2 29 Mory LOAD TRACe 2 29 Mory LOCK STATe 2 30 Mory MDIRectory 2 30 Mory STORe STATe 2 31 Mory STORe TRACe 2 31 O OCR 3 8 OENR 3 10 OEVR 3 7 OPC 2 32 operation complete events 3 16 operation condition register 3 3 operation enable register 3 10 operation event register 3 3 OPT 2 32 output queue 3 11 OUTPut TRIGger MODE 2 35 OUTPut 1 IMPedance 2 33 OUTPut 1 POLarity 2 34 OUTPut 1 STATe 2 34 Overview of the Manual 1 1 p power on events 3 16 PSC 2 35 Q QCR 3 8 QENR 3 10 QEVR 3 8 query errors 3 15 questionable condition register 3 8 questionable enable register 3 10 questionable event register 3 8 queues 3 10 AFG2021 Arbitrary Function Generator Programmer Manual Index 1 Index R RCL 2
55. ator Programmer Manual 3 3 Status and Events Status Registers There are six types of status registers Status Byte Register SBR See page 3 4 Status Byte Register SBR Standard Event Status Register SESR See page 3 5 Standard Event Status Register SESR Operation Condition Register OCR See page 3 8 Operation Condition Register OCR Operation Event Register OEVR See page 3 7 Operation Event Register OEVR Questionable Condition Register QCR See page 3 8 Questionable Condition Register OCR Questionable Event Register QEVR See page 3 8 Questionable Event Register QEVR Status Byte Register SBR The SBR is made up of 8 bits Bits 4 5 and 6 are defined in accordance with IEEE Std 488 2 1992 shown in the following figure These bits are used to monitor the output queue SESR and service requests respectively 6 7 RQS 5 j4 3 2 1 IO OSB 6 ESB MAV QSB EQS MSS Figure 3 2 The Status Byte Register SBR Table 3 1 SBR bit functions Bit Function 7 MSB OSB Operation Status Bit Indicates that an operation event has occurred 6 RQS Request Service When the instrument is accessed using the GPIB serial poll command this bit is called the Request Service RQS bit and indicates to the controller that a service request has occurred in other words that the GPIB bus SRQ line is LOW The RQS
56. bed in the Command Syntax subsection Command parts Header Space A E N CALCulate MARKer MODE ABSolute Dal Mnemonics Argument Figure 1 1 Command parts Section 2 also describes the effect of each command and provides examples of how you might use it The Command Groups subsection provides lists by functional areas The commands are listed alphabetically in the Command Descriptions section AFG2021 Arbitrary Function Generator Programmer Manual 1 1 Getting Started SOURce Commands SOURce FM STATe Commands MEMory SOURce BURSt IEEE Common Commands TRIG IMMediate CAL CLS ESE ESR IDN OPC E Arguments Examples Commands grouped in functional areas Commands listed alphabetically eee Figure 1 2 Functional groupings and an alphabetical list of commands Status and Events The program may request information from the instrument The instrument provides information in the form of status and error messages The following figure illustrates the basic operation of this system Section 3 Status and Events describes how to get status or event information from the program and details the event and error messages Your program requests status and event reports gt Controller The generator status and event reports AFG2021 N 9 23 GPIB cable SEBS 00 pre sjs s1s1s1a Ye Gooo00d i T J
57. both types of quotation marks for the same string correct This string uses quotation marks correctly correct This string also uses quotation marks correctly incorrect This string does not use quotation marks correctly m You can use upper case lower case or a mixture of both cases for all commands queries and parameters SOURCE FREQUENCY 10MHZ is the same as source frequency 100mhz and SOURCE frequency LOMHZ NOTE Literal strings quoted are case sensitive for example file names m No embedded spaces are allowed between or within nodes correct OUTPUT FILTER LPASS FREQUENCY 200MHZ incorrect OUTPUT FILTER LPASS FREQUENCY 200MHZ 2 8 AFG2021 Arbitrary Function Generator Programmer Manual Command Syntax IEEE 488 2 Common Commands Description ANSI IEEE Standard 488 2 defines the codes formats protocols and usage of common commands and queries used on the interface between the controller and the instruments The instrument complies with this standard Command and Query The syntax for an IEEE 488 2 common command is an asterisk followed by a Structure command and optionally a space and parameter value The syntax for an IEEE 488 2 common query is an asterisk followed by a query and a question mark All of the common commands and queries are listed in the last part of the Syntax and Commands section The following are examples of common commands m ESE 16 m CLS The followi
58. bration failed CH1 ASIC TINT 1403 Calibration failed CH1 ASIC SGEN 1405 Calibration failed CH1 ASIC clock duty 2100 Self test failed Calibration data not found 2101 Self test failed Calibration data checksum 2102 Self test failed Calibration data invalid 2201 Self test failed ASIC 1 memory 2203 Self test failed ASIC 1 overheat 2301 Self test failed CH1 Internal offset 2303 Self test failed CH1 Output offset 2305 Self test failed CH1 Output gain 2401 Self test failed CH1 x 3 dB attenuator 2403 Self test failed CH1 x 6 dB attenuator 2405 Self test failed CH1 x 10 dB attenuator 2407 Self test failed CH1 x 20 dB 1 attenuator 2409 Self test failed CH1 x 20 dB 2 attenuator 2411 Self test failed CH1 Filter 2501 Self test failed CH1 Sine Flatness 9112 Waveform error invalid waveform length 9113 Waveform error waveform length is too short AFG2021 Arbitrary Function Generator Programmer Manual Status and Events 3 18 AFG2021 Arbitrary Function Generator Programmer Manual Programming Examples Programming Examples The following two example programs which demonstrate methods that you can use to control the instrument through the General Purpose Interface Bus GPIB are included on the AFG2021 instrument Product CD m Example 1 Set up a Waveform Output m Example 2 Waveform Transfer and Copy The example programs are written in Microsoft Visual Basic Version 6 0 The programs run on Windows PC compatible system
59. cters The following figure shows the five command message elements Comma Header S SA MMEMory STATe LOCK 1 ON Mnemonics Arguments Space Commands Commands cause the instrument to perform a specific function or change one of its settings Commands have the structure lt Header gt lt Space gt lt Argument gt lt Comma gt lt Argument gt A command header is made up of one or more mnemonics arranged in a hierarchical or tree structure The first mnemonic is the base or root of the tree and each subsequent mnemonic is a level or branch of the previous one Commands at a higher level in the tree may affect those at a lower level The leading colon always returns you to the base of the command tree Queries Queries cause the instrument to return information about its status or settings Queries have the structure lt Header gt lt Header gt lt Space gt lt Argument gt lt Comma gt lt Argument gt AFG2021 Arbitrary Function Generator Programmer Manual 2 3 Command Syntax Command Entry You can specify a query command at any level within the command tree unless otherwise noted These branch queries return information about all the mnemonics below the specified branch or level Query Responses When a query is sent to the instrument only the values are returned When the returned value is a mnemonic it is noted in abbreviated format as shown in the following table See Table 2 3
60. d allows the instrument to possibly assert SRQ after power on lt NR1 gt 0 sets the power on status clear flag true Sending PSC 1 therefore enables the power on status clear and prevents any SRQ assertion after power on lt NR1 gt PSC 0 sets the power on status clear flag to false This command restores the state of the instrument from a copy of the settings stored in the setup memory The settings are stored using the SAV command If the specified setup memory is deleted this command causes an error Memory RCL 1 2 3 4 SAV 1 2 3 or 4 specifies the location of setup memory RCL 3 restores the instrument from a copy of the settings stored in memory location 3 This command resets the instrument to the factory default settings System RST AFG2021 Arbitrary Function Generator Programmer Manual Arguments Examples SAV No Query Form Group Syntax Related Commands Arguments Examples Command Descriptions None RST resets the instrument settings to the factory defaults This command stores the current settings of the instrument to a specified setup memory location A setup memory location numbered 0 last setup memory is automatically overwritten by the setups when you power off the instrument If a specified numbered setup memory is locked this command causes an error Memory SAV 1 2 3 4 RCL 1 2 3 or 4 specifies the location of setup memory SAV
61. d return time The setting range is ms to 300 s Source AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Syntax SOURCe 1 SWEep TIME lt seconds gt MINimum MAXimum SOURCe 1 SWEep TIME MINimum MAXimum Arguments lt seconds gt lt NRf gt lt units gt where lt NRf gt is the sweep time in seconds lt units gt ns us ms s Returns lt seconds gt Examples SOURCe1 SWEep TIME 100ms sets the CH 1 sweep time to 100 ms SOURce 1 VOLTage LEVel IMMediate HIGH This command sets or queries the high level of output amplitude for the specified channel Group Source Syntax SOURCe 1 VOLTage LEVel IMMediate HIGH lt voltage gt MINi mum MAXi mum SOURCe 1 VOLTage LEVel IMMediate HIGH MINimum MAXi mum Arguments lt voltage gt lt NRf gt lt units gt where lt NRf gt is the high level of output amplitude lt units gt mV V Returns lt voltage gt Examples SOURCe1 VOLTage LEVel IMMediate HIGH 1V sets the high level of CH 1 output amplitude to 1 V AFG2021 Arbitrary Function Generator Programmer Manual 2 73 Command Descriptions SOURce 1 VOLTage LEVel IMMediate _LOW This command sets or queries the low level of output amplitude for the specified channel Group Source Syntax SOURCe 1 VOLTage LEVel IMMediate Low lt voltage gt MINimum MAXimum SOURCe 1 VOLTage LEVel IMMediate LOW MIN
62. de in the following tables Events in these tables are organized by event class Table 3 5 Definition of event codes Event class Code range Description No error 0 No event or status Command errors 100 to 199 Command syntax errors Execution errors 200 to 299 Command execution errors Device specific errors 300 to 399 Internal device errors Query errors 400 to 499 System event and query errors Power on events 500 to 599 Power on events AFG2021 Arbitrary Function Generator Programmer Manual 3 11 Status and Events Command Errors Table 3 5 Definition of event codes cont Event class Code range Description User request events 600 to 699 User request events Request control events 700 to 799 Request control events Operation complete events 800 to 899 Operation complete events Extended device specific 1 to 32767 Device dependent device errors errors Reserved other than above not used The following table shows the error messages generated by improper command syntax Check that the command is properly formed and that it follows the rules in the Syntax and Commands Table 3 6 Command error messages Error code Error message 100 Command error 101 Invalid character 102 Syntax error 103 Invalid separator 104 Data type error 105 GET not allowed 108 Parameter not allowed 109 Missing paramet
63. delay gt SOURCe1 BURSt DELay 20ms sets the CH 1 delay time to 20 ms SOURce 1 COMBine FEED Group Syntax Related Commands This command sets or queries whether to add the internal noise to an output signal for the specified channel When you specify the internal noise you can set or query the noise level by SOURce lt 3 gt POWer LEVel IMMediate AMPLitude command 669 To disable the internal noise add specify Source SOURCe 1 COMBine FEED NOoISe SOURCe 1 COMBine FEED SOURce lt 3 gt POWer LEVel MMediate AMPLitude AFG2021 Arbitrary Function Generator Programmer Manual 2 43 Command Descriptions Arguments Returns Examples NOISe indicates that the internal noise is added to the output signal disables the internal noise add function NOIS SOURCe1 COMBine FEED NOIS adds a noise signal to the CH 1 output signal SOURce 1 FM DEViation Group Syntax Arguments Returns Examples This command sets or queries the peak frequency deviation of FM modulation for the specified channel The setting range of frequency deviation depends on the waveform selected as the carrier For more information refer to the AFG2021 instrument Specifications and Performance Verification Manual Source SOURCe 1 FM DEViation lt deviation gt MINimum MAXimum SOURCe 1 FM DEViation MINimum MAXimum lt deviation gt lt NRf gt lt units
64. describes the Output commands Table 2 10 Output commands Header Description OUTPut 1 IMPedance Set query impedance OUTPut 1 POLarity Set query polarity OUTPut 1 STATe Set query output on or off OUTPut TRIGger MODE Set query the mode of Trigger Output Source Commands Source commands let you set waveform output parameters The following table lists and describes the Source commands Table 2 11 Source commands Header Description SOURce ROSCillator SOURce Set query clock reference input SOURce 1 AM DEPTh Set query amplitude modulation depth SOURce 1 AM INTernal FREQuency Set query internal modulation frequency SOURce 1 AM INTernal FUNCtion Set query modulation waveform setting SOURce 1 AM INTernal FUNCtion EFILe Set query EF ILe setting SOURce 1 AM SOURce Set query amplitude modulation source AFG2021 Arbitrary Function Generator Programmer Manual Table 2 11 Source commands cont Header Command Groups Description SOURce 1 AM STATe Set query amplitude modulation status SOURce 1 BURSt MODE Set query burst mode SOURce 1 BURSt NCYCles Set query burst mode waveform output cycle SOURce 1 BURSt STATe Set query burst mode status SOURce 1 BURSt TDELay SOURce 1 COMBine FEED Set query burst mode trigger delay time Set query internal noise SOURce 1 FM DEV
65. ds gt lt NRf gt lt units gt where lt units gt us ms s lt seconds gt TRIGGER SEQUENCE TIMER 5ms sets the internal trigger rate to 5 ms TRIGger SEQuence I MMediate No Query Form This command forces a trigger event to occur AFG2021 Arbitrary Function Generator Programmer Manual 2 95 Command Descriptions Group Syntax Arguments Examples TST Query Only Group Syntax Related Commands Arguments Returns Examples 2 96 Trigger TRIGger SEQuence IMMediate None TRIGger SEQuence IMMediate generates a trigger event This command performs a self test and returns the results NOTE The self test can take several minutes to complete During this time the instrument does not execute any commands Do not power off the instrument during the self test Calibration and Diagnostic TST DIAGnostic ALL None lt NR1 gt where lt NR1 gt 0 indicates that the self test completed without errors lt NR1 gt 0 indicates that the instrument detected an error TST performs a self test and returns 0 if no error is reported AFG2021 Arbitrary Function Generator Programmer Manual WAI No Query Form Group Syntax Related Commands Arguments Examples Command Descriptions This command prevents the instrument from executing further commands or queries until all pending commands that generate an OPC message are complete S
66. e response These events occur when the instrument detects an off to on transition in its power supply Table 3 10 Power on events Event code Event message 500 Power on These events are not used in this instrument Table 3 11 User request events Event code Event message 600 User request These events are not used in this instrument Table 3 12 Request control events Event code Event message 700 Request control These events occur when instrument s synchronization protocol having been enabled by an OPC command completes all selected pending operations Table 3 13 Operation complete events Event code Event message 800 Operation complete The following table lists the error codes that are unique to the AFG2021 instrument AFG2021 Arbitrary Function Generator Programmer Manual Table 3 14 Device errors Status and Events Error code Error message 1101 Calibration failed CH1 Internal offset 1103 Calibration failed CH1 Output offset 1105 Calibration failed CH1 Output gain 1201 Calibration failed CH1 x 3 dB attenuator 1203 Calibration failed CH1 x 6 dB attenuator 1205 Calibration failed CH1 x 10 dB attenuator 1207 Calibration failed CH1 x 20 dB 1 attenuator 1209 Calibration failed CH1 x 20 dB 2 attenuator 1211 Calibration failed CH1 Filter 1301 Calibration failed CH1 Sine Flatness 1401 Cali
67. e returned value is a mnemonic it is noted in abbreviated format See Table 2 3 Parameter Types Every parameter in the command and query descriptions is of a specified type See Table 2 4 The parameters are enclosed in brackets such as lt value gt The parameter type is listed after the parameter and is enclosed in parentheses for example boolean Some parameter types are defined specifically for the instrument command set and some are defined by SCPI Table 2 4 Parameter types used in syntax descriptions Parameter type Description Example arbitrary block 1 A specified length of 512234xxxxx where arbitrary data 5 indicates that the following 5 digits 12234 specify the length of the data in bytes XXXXX indicates the data or HOXxxxx lt LF gt lt amp EOI gt boolean Boolean numbers or values ON or 0 OFF or 0 AFG2021 Arbitrary Function Generator Programmer Manual 2 5 Command Syntax Table 2 4 Parameter types used in syntax descriptions cont Parameter type Description Example discrete A list of specific values MIN MAX binary Binary numbers B0110 octal Octal numbers 057 03 hexadecimal 2 Hexadecimal numbers HAA H1 0 9 A B C D E F NR1 2 numeric Integers 0 1 15 1 NR223 numeric Decimal numbers 1 2 3 141516 6 5 NR32 numeric Floating point numbers 3 1415E 9 16 1E5 NRf2 numeric Flexible decimal number that See NR1 NR2 and NR3 may be type NR1
68. e current password DEFAULT to abc 123 AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions SYSTem SECurity MMediate No Query Form Group Syntax Arguments Examples SYSTem ULANguage Group Syntax Arguments Returns Examples This command erases all the current instrument setups setup memory last setup memory user waveform memory and log content and recalls the factory default settings Calibration data is not erased The communication settings are initialized to the factory default settings This might cause a remote communication error System SYSTem SECurity IMMediate None SYSTEM SECURITY IMMEDIATE initializes the instrument This command sets or queries the language that the instrument uses to display information on the screen System SYSTem ULANguage ENGLish FRENch GERMan JAPanese KORean SCHinese TCHinese RUSSian SYSTem ULANguage ENGLish FRENch GER Man JA Panese K ORean SCHinese TCHinese RUSSian specifies which language will be used to display instrument information on the screen ENGL FREN GERM JAP KOR SCH TCH RUSS SYSTEM ULANGUAGE FRENCh specifies that the instrument displays information in French AFG2021 Arbitrary Function Generator Programmer Manual 2 87 Command Descriptions SYSTem VERSion Query Only Group Syntax Arguments Returns Examples This query only command returns the conformed SCPI version of the i
69. e symmetry AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions lt units gt PCT Returns lt Symmetry gt Examples SOURCe1 FUNCtion RAMP SYMMetry 80 5 sets the symmetry of the CH 1 ramp waveform to 80 5 SOURce 1 FUNCtion SHAPe This command sets or queries the shape of the output waveform When the specified user memory is deleted this command causes an error if you select the user memory Group Source Syntax SOURce 1 FUNCtion SHAPe SINusoid SQUare PULSe RAMP PRNoise DC SINC GAUSsian LORentz ERISe EDECay HAVersine USER 1 USER2 USER3 USER4 EMEMory EFILe SOURCe 1 FUNCtion SHAPe Arguments SINusoid SQUare PULSe RAMP PRNoise DC SINC GAUSsian LORentz ERISe EDECay HAVersine The following table shows the combination of modulation type and the shape of output waveform Sine Square Ramp Arb Sin x x Gaussian Lorentz Exponential Rise Exponential Decay Haversine Pulse Noise DC AM N FM y PM y FSK y PWM y Sweep y Burst Ni Ni If you select a waveform shape that is not allowed with a particular modulation sweep or burst the Run mode will automatically be changed to Continuous AFG2021 Arbitrary Function Generator Programmer Manual 2 55 Command Descriptions Returns Examples If you specify EFILe when there is no EFILe or the EFILe is not yet defined this command causes an error If you change the type of output wavefor
70. er 110 Command header error 111 Header separator error 112 Program mnemonic too long 113 Undefined header 114 Header suffix out of range 115 Unexpected number of parameters 120 Numeric data error 121 Invalid character in number 123 Exponent too large 124 Too many digits 128 Numeric data not allowed 130 Suffix error 131 Invalid suffix 134 Suffix too long 138 Suffix not allowed 140 Character data error AFG2021 Arbitrary Function Generator Programmer Manual Status and Events Table 3 6 Command error messages cont Error code Error message 141 Invalid character data 144 Character data too long 148 Character data not allowed 150 String data error 151 Invalid string data 158 String data not allowed 160 Block data error 161 Invalid block data 168 Block data not allowed 170 Expression error 171 Invalid expression 178 Expression data not allowed 180 Macro error 181 Invalid outside macro definition 183 Invalid inside macro definition 184 Macro parameter error Execution Errors The following table shows lists the errors that are detected during execution of a command Table 3 7 Execution error messages Error code Error message 200 Execution error 201 Invalid while in local 202 Settings lost due to RTL 203 Command protected 210 Trigger error 211 Trigger ignored 212 Arm ignored 21
71. eries The related topics listed below describe the syntax of these commands and queries The topics also describe the conventions that the instrument uses to process them See Command Groups See page 2 11 for a listing of the commands by command group or use the index to locate a specific command Backus Naur Form Definition This manual may describe commands and queries using the Backus Naur Form BNF notation The following table defines the standard BNF symbols Table 2 1 BNF symbols and meanings Symbol Meaning we Defined element Is defined as Exclusive OR Group one element is required Optional can be omitted Previous element s may be repeated Comment Command and Query Structure 2 2 Commands consist of set commands and query commands usually simply called commands and queries Commands change instrument settings or perform a specific action Queries cause the instrument to return data and information about its status Most commands have both a set form and a query form The query form of the command is the same as the set form except that it ends with a question mark For example the set command DISPlay BRIGhtness has a query form DISPlay BRIGhtness Not all commands have both a set and a query form some commands are set only and some are query only A few commands do both a set and query action For example the CAL command runs a self calibration program on the
72. ernal selects the internal clock reference SOURce 1 SWEep HTIMe Group Syntax Arguments Returns Examples This command sets or queries the sweep hold time Hold time represents the amount of time that the frequency must remain stable after reaching the stop frequency Source SOURCe 1 SWEep HTIMe lt seconds gt MINimum MAXimum SOURCe 1 SWEep HTIMe MINimum MAXimum lt seconds gt lt NRf gt lt units gt where lt NRf gt is the hold time in seconds lt units gt ns us ms s lt seconds gt SOURCe1 SWEep HTIMe 1ms sets the CH 1 hold time to 1 ms SOURce 1 SWEep MODE 2 70 The SOURce 1 SWEep MODE command selects auto or manual for the sweep mode for the specified channel AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions The query command returns the sweep mode for the specified channel Group Source Syntax SOURCe 1 SWEep MODE AUTO MANual SOURCe 1 SwEep MODE Related Commands SOURce 1 SWEep HTIMe SOURce 1 SWEep RTIMe SOURce 1 SWEep TIME TRIGger SEQuence SOURce TRIGger SEQuence TIMer Arguments AUTO sets the sweep mode to auto The instrument outputs a continuous sweep at a rate specified by Sweep Time Hold Time and Return Time MANual sets the sweep mode to manual The instrument outputs one sweep when a trigger input is received Returns AUTO MAN Examples SOURCe1 SWEep MODE AUTO sets the
73. error message or a warning message is displayed on the screen The instrument does not beep when an error or warning caused by remote command execution System SYSTem BEEPer STATe ON OFF lt NR1 gt SYSTem BEEPer STATe ON or lt NR1 gt 0 enables the beeper OFF or lt NR1 gt 0 disables the beeper AFG2021 Arbitrary Function Generator Programmer Manual Returns Examples Command Descriptions lt NR1 gt SYSTEM BEEPER STATE ON enables the beeper function SYSTem ERRor NEXT Query Only Group Syntax Arguments Returns Examples This query only command returns the contents of the Error Event queue System SYSTem ERRor NEXT None lt Error event number gt lt NR1 gt lt Error event description gt lt string gt SYSTEM ERROR NEXT might return the following response 410 Query INTERRUPTED If the instrument detects an error or an event occurs the event number and event message will be returned SYSTem KCLick STATe Group Syntax This command enables or disables the click sound when you push the front panel buttons or turn the general purpose knob The query command returns 0 OFF or 1 ON System SYSTem KCLick STATe ON OFF lt NR1 gt SYSTem KCLick STATe AFG2021 Arbitrary Function Generator Programmer Manual 2 83 Command Descriptions Arguments ON or lt NR1 gt 0 enables click sound OFF or lt NR1 gt 0 disables click
74. f setup memory lt file_name gt lt string gt specifies a file name in the mass storage system The lt file_name gt includes path Path separators are forward slashes MMEMORY STORE STATE 1 SETUP1 TFS Copies the setup file in the setup memory location 1 to a file named SETUPI TFS in the mass storage system MMEMory STORe TRACe No Query Form Group Syntax This command copies a waveform data file in the Edit Memory to a file in the mass storage system If the file in the mass storage is locked this command causes an error You cannot create a new file if the directory is locked Mass Memory MMEMory STORe TRACe EMEMory lt file_name gt AFG2021 Arbitrary Function Generator Programmer Manual 2 31 Command Descriptions Related Commands Arguments Examples OPC Group Syntax Arguments Returns Examples OPT Query Only Group 2 32 MMEMory LOCK STATe MMEMory LOAD TRACe lt file_name gt lt string gt specifies a file name in the mass storage system The lt file_name gt includes path Path separators are forward slashes MMEMORY STORE TRACE EMEMory SAMPLE1 TFW Copies the content of EMEMory to a file named SAMPLE1 TFW in the mass storage system This command generates the operation complete message by setting bit 0 in the Standard Event Status Register SESR when all pending commands that generate an OPC message are complete The query c
75. forward slashes lt file_name gt SOURCe1 FM INTernal FUNCtion EFILe SAMPLEL sets a file named SAMPLE1 in the mass storage SOURce 1 FM SOURce 2 46 This command sets or queries the source of modulating signal of FM modulation for the specified channel AFG2021 Arbitrary Function Generator Programmer Manual Group Syntax Arguments Returns Examples SOURce 1 FM STATe Group Syntax Arguments Returns Examples Command Descriptions Source SOURCe 1 FM SOURCe INTernal ExTernal SOURCe 1 FM SOURCe INTernal means that the carrier waveform is modulated with the internal source EXTernal means that the carrier waveform is modulated with an external source INT EXT SOURCe1 FM SOURCe INTernal sets the CH 1 source of modulating signal to internal This command enables or disables FM modulation The query command returns the state of FM modulation Source SOURCe 1 FM STATe ON OFF lt NR1 gt SOURce 1 FM STATe ON or lt NR1 gt 40 enables FM modulation OFF or lt NR1 gt 0 disables FM modulation lt NR1 gt SOURCe1 FM STATe ON enables the CH 1 FM modulation SOURce 1 FREQuency CENTer This command sets or queries the center frequency of sweep for the specified channel This command is always used with the SOURce 1 FREQuency SPAN command The setting range of center frequency depends on the waveform selected for sweep AFG2021 Arbi
76. g gt specifies current password The string is case sensitive Examples SYSTEM PASSWORD CENABLE lt password gt deactivates the security protection SYSTem PASSword CENable STATe Query Only This query only command returns the security protection state Group System Syntax SYSTem PASSword CENable STATe Related Commands SYSTem PASSword CDISable AFG2021 Arbitrary Function Generator Programmer Manual 2 85 Command Descriptions Arguments Returns Examples SYSTem PASSword CENable SYSTem PASSword NEW None lt NR1 gt where lt NR1 gt 0 indicates that the security protection is in the on state lt NR1 gt O0 indicates that the security protection is in the off state SYSTEM PASSWORD CENABLE STATE might return 0 indicating that the instrument security protection is on SYSTem PASSword NEW No Query Form Group Syntax Related Commands Arguments Examples 2 86 This command changes the password System SYSTem PASSword NEW lt current_password gt lt new_password gt SYSTem PASSword CDISable SYSTem PASSword CENable SYSTem PASSword CENable STATe lt current_password gt lt string gt specifies current password lt new_password gt lt string gt specifies a new password Password strings are case sensitive A password must have at least four characters and not more than 12 characters SYSTEM PASSWORD NEW DEFAULT abc123 changes th
77. his command causes an error Group Source Syntax SOURce 1 FM INTernal FUNCtion SINusoid SQUare TRIangle RAMP NRAMp PRNoise USER 1 USER2 USER3 USER4 EMEMory EFILe SOURCe 1 FM INTernal FUNCtion Related Commands SOURce 1 FM SOURce AFG2021 Arbitrary Function Generator Programmer Manual 2 45 Command Descriptions Arguments Returns Examples SINuSOid SQUare TRIangle RAMP NRAMp PRNoise One of six types of function waveform can be selected as a modulating signal USER 1 USER2 USER3 USER4 EMEMory A user defined waveform saved in the user waveform memory or the EMEMory can be selected as a modulating signal EFILe EFILe is used as a modulating signal SIN SQU TRI RAMP NRAM PRN USER1 USER2 USER3 USER4 EMEMory EFILe SOURCe1 FM INTernal FUNCtion SQUare selects Square as the shape of modulating waveform for the CH 1 output SOURce 1 FM INTernal FUNCtion EFILe Group Syntax Arguments Returns Examples This command sets or queries an EFILe name used as a modulating waveform for FM modulation A file name must be specified in the mass storage system This command returns if there is no file in the mass storage Source SOURCe 1 FM INTernal FUNCtion EFILe lt file_name gt SOURCe 1 FM INTernal FUNCtion EFILe lt file_name gt lt string gt specifies a file name in the mass storage system The lt file_name gt includes path Path separators are
78. i iccccacssnendeasteuntccennaaeadanoddsanndied daadddas ENAA REA NARRA 1 3 Setting the GPIB Addres Seenaa rs nE E EEEE teas EN E EE EREE EE EE E EERE 1 4 Using Tek VISAsssiichidudadoiacdenctebibankidadgal e N e n 1 4 Syntax and Commands Syntax and Commands ccc ivrsacccessseeraeswadedeieudd aosibsvacks swadaanie E R EEEE EEEREN EAER RERAN 2 1 Command SyntaX e eteccien reacia i E EE E EE E E EE EES 2 2 Backus Naur Form Definition nnnnnneeeneee enerne e essre err rrssrsrsrssessrssrsrssrssrssrn gt 2 2 Command and Query Structure nnseessnunssrrrererrrrrrrrrrrrrerrerrrrrrrrrrrrrrrerrerrrrerreree 2 2 SCPI Commands and Queries 00 0 ccc cece cece eee unososertrrrossrersrrrnrsererrrerssererrerr gt 2 4 IEEE 488 2 Common Commatds cccc ccc eee eee ene nee nen een nbn ne eas 2 9 Command Groups eccdeisinanbanterevenseonnsshehaiges Macrae ences nranseaw eds OEE E E E Gowns enensad 2 11 Command Descriptions vas sncvicascccsdcenatsawaaesea seen ngs oan tdesdeeeedddage cd falcata a saeduadedconseekaasse 2 17 Status and Events Status and EVENS oense er ni nnee mvaceunre sows dons EEEE EE E donne EEDE EEA EE EEEE 3 1 Status Reporting Structure ccc a cccsccesacavaewenaees NEEE EE EEEE EE NEEE EE a NEEN E 3 1 Registers 23 22st eet tonie o a E O E E EE O E E E E N 3 3 O E EE EO E E N A E E EE N EE E ES 3 10 Messages and C d Sssissscciriennussee nnn a E E N R ae 3 11 Programming Examples Programming Examples sonosio
79. iation Set query frequency deviation SOURce 1 FM INTernal FRE Quency Set query internal modulation frequency SOURce 1 FM INTernal FUNCtion SOURce 1 FM INTernal FUNCtion EFILe Set query internal modulation waveform Set query EF ILe setting SOURce 1 FM SOURce Set query frequency modulation source SOURce 1 FM STATe Set query frequency modulation status SOURce 1 FREQuency CENTer SOURce 1 FREQuency CW FlXed Set query center frequency Set query output waveform frequency SOURce 1 FREQuency MODE Set query sweep status SOURce 1 FREQuency SPAN Set query sweep frequency span SOURce 1 FREQuency STARt Set query sweep start frequency SOURce 1 FREQuency STOP Set query sweep stop frequency SOURce 1 FSKey FREQuency Set query FSK hop frequency SOURce 1 FSKey INTernal RATE Set query FSK internal modulation rate SOURce 1 FSKey SOURce SOURce 1 FSKey STATe Set query FSK source Set query FSK status SOURce 1 FUNCtion EFILe Set query EFlLe name SOURce 1 FUNCtion RAMP SYMMetry Set query ramp waveform symmetry SOURce 1 FUNCtion SHAPe SOURce 1 PHASe ADJust Set query output waveform Set query output waveform phase SOURce 1 PM DEViation DCYCle Set query phase modulation deviation SOURce 1 PM INTernal FREQuency Set query internal modulation frequency SOURce
80. ies whether to lock or unlock the user waveform memory AFG2021 Arbitrary Function Generator Programmer Manual Group Syntax Arguments Returns Examples TRACe DATA POINts Group Syntax Arguments Returns Examples TRG No Query Form Command Descriptions Trace TRACe DATA LOCK STATe USER 1 USER2 USER3 USER4 ON OFF lt NR1 gt TRACe DATA LOCK STATe USER 1 USER2 USER3 USER4 ON or lt NR1 gt 0 locks the specified user waveform memory OFF or lt NR1 gt 0 unlocks the specified user waveform memory lt NR1 gt DATA LOCK STATe USER1 ON locks the USER1 waveform memory This command sets or queries the number of data points for the waveform created in the edit memory Trace TRACe DATA POINts EMEMory lt points gt MINimum MAXimum TRACe DATA POINts EMEMory MIN MAX lt points gt lt NR1 gt where lt NR1 gt sets the number of points for the waveform created in the edit memory that ranges from 2 to 131072 lt NR1 gt DATA POINts EMEMory 500 sets the waveform data points to 500 in the edit memory This command generates a trigger event AFG2021 Arbitrary Function Generator Programmer Manual 2 93 Command Descriptions Group Syntax Related Commands Arguments Examples Trigger TRG TRIGger SEQuence IMMediate None TRG generates a trigger event TRIGger SEQuence SLOPe Group Syntax Arguments Returns E
81. imum MAXimum Arguments lt voltage gt lt NRf gt lt units gt where lt NRf gt is the low level of output amplitude lt units gt mV V Returns lt voltage gt Examples SOURCe1 VOLTage LEVel IMMediate LOW 1v sets the low level of CH 1 output amplitude to 1 V SOURce 1 VOLTage LEVel IMMediate OFFSet This command sets or queries the offset level for the specified channel Group Source Syntax SOURCe 1 VOLTage LEVel IMMediate OFFSet lt voltage gt MINimum MAXimum SOURCe 1 VOLTage LEVel IMMediate OFFSet MINimum MAXimum Arguments lt voltage gt lt NRf gt lt units gt where lt NRf gt is the offset voltage level lt units gt mV V 2 74 AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Returns lt voltage gt Examples SOURCe1 VOLTage LEVel IMMediate OFFSet 500mv sets the CH 1 offset level to 500 mV SOURce 1 VOLTage LEVel IMMediate AMPLitude This command sets or queries the output amplitude for the specified channel Units Amplitude resolution VPP 0 1 mVp p or four digits VRMS 0 1 mVrms or four digits DBM 0 1 dBm You can set the units of output amplitude by using either the bezel menu selection or the SOURce 1 VOLTage UNIT command The selection by bezel menu has priority over the remote command Group Source Syntax SOURCe 1 VOLTage LEVel IMMediate AMPLitude lt amp 17 tude gt MI
82. it_value gt STATUS QUESTIONABLE ENABLE 32 sets the FREQuency bit in the QENR to on STATus QUEStionable EVENt Query Only Group Syntax Arguments Returns Examples STB Query Only Group Syntax AFG2021 Arbitrary Function Generator Programmer Manual This query only command returns the value in the Questionable Event Register and clears the Questionable Event Register Status STATUS QUEStionable EVENt None lt bit_value gt lt NR1 gt STATUS QUESTIONABLE EVENT might return 32 which indicates that the QEVR contains the binary number 00000000 00100000 and the FREQuency bit is set to on This query only command returns the contents of the Status Byte Register SBR using the Master Summary Status MSS bit Status STB 2 81 Command Descriptions Arguments Returns Examples None lt NR1 gt STB might return 96 showing that the SBR contains the binary value 01100000 SYSTem BEEPer IMMediate No Query Form Group Syntax Arguments Examples This command causes the instrument to beep immediately System SYSTem BEEPer IMMediate None SYSTEM BEEPER IMMEDIATE causes a beep SYSTem BEEPer STATe Group Syntax Arguments 2 82 The SYSTem BEEPer STATe command sets the beeper ON or OFF The SYSTem BEEPer STATe command returns 0 OFF or 1 ON When the beeper is set to ON the instrument will beep when an
83. itrary Function Generator Programmer Manual Command Syntax NOTE The numeric suffix of a command or query may be included in either the long form or short form the instrument will default to 1 if no suffix is used Chaining Commands and You can chain several commands or queries together into a single message To Queries create a chained message first create a command or query add a semicolon and then add more commands or queries and semicolons until the message is complete If the command following a semicolon is a root node precede it with a colon The following figure illustrates a chained message consisting of several commands and queries The single chained message should end in a command or query not a semicolon Responses to any queries in your message are separated by semicolons SOUR FREQ FIX 100 OUTP STAT ON SOUR VOLT AMPL TRIG SEQ TIM ode oles whe olen First command Second command First query Second query The response from this chained message might be 1 000E0 1 000E 3 Response from first query Response from second query 0587 001 Figure 2 3 Example of chaining commands and queries If a command or query has the same root and lower level nodes as the previous command or query you can omit these nodes In the following figure the second command has the same root node TRIGger SEQuence as the first command so these nodes can be omitted TRIG SEQ TIM 2 5 TRIG SEQ SLOP POS TRIG SEQ S
84. lated linearly lt point_data2 gt lt NR1 gt where lt NRI gt is the data value at the end point DATA DATA LINE EMEMory 1 2047 250 4094 sets a data value of 2047 for start point and a data value of 4094 for end point 250 and interpolates linearly between these two points in the edit memory AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions TRACe DATA DATA VALue Group Syntax Arguments Returns Examples This command sets or queries the data value at the specified point in the edit memory Trace TRACe DATA L DATA VALUe EMEMory lt point gt lt data gt TRACe DATA DATA VALue lt point gt lt NR1 gt where lt NR I gt is the specified point number in the edit memory lt data gt lt NR1 gt where lt NR1 gt is the data value for the specified point number lt NRI gt DATA DATA VALue EMEMory 500 2047 sets the data value to 2047 for the point number 500 in the edit memory DATA DATA VALue EMEMory 500 might return 2047 This example indicates that the data value of point number 500 is set to 2047 TRACe DATA DEFine No Query Form Group Syntax Arguments This command resets the contents of edit memory Trace TRACe DATA DEFine EmEMory lt points gt lt trace_name gt lt points gt lt NR1 gt where AFG2021 Arbitrary Function Generator Programmer Manual 2 91 Command Descriptions Examples lt NR
85. level that is added to the output signal to 50 SOURce 1 PULSe DCYCle This command sets or queries the duty cycle of the pulse waveform for the specified channel The setting range is 0 001 to 99 999 in increments of 0 001 The instrument will hold the settings of leading edge and trailing edge when the duty cycle is varied Refer to the SOURce 1 PULSe WIDTh command for the setting range Group Source Syntax SOURce 1 PULSe DCYCle lt percent gt MINimum MAXimum SOURce 1 PULSe DCYCle MINimum MAXimum Related Commands SOURce 1 PULSe WIDTh AFG2021 Arbitrary Function Generator Programmer Manual 2 61 Command Descriptions Arguments Returns Examples lt percent gt lt NR2 gt lt units gt where lt NR2 gt is the duty cycle lt units gt PCT lt percent gt SOURCe1 PULSe DCYCle 80 5 sets the duty cycle of the pulse waveform on CH 1 to 80 5 SOURce 1 PULSe DELay Group Syntax Related Commands Arguments Returns Examples 2 62 This command sets or queries the lead delay of the pulse waveform for the specified channel Source SOURCe 1 PULSe DELay lt delay gt MINimum MAXimum SOURCe 1 PULSe DELay MINimum MAXimum lt delay gt lt NR2 gt lt units gt where lt NR2 gt is the lead delay lt units gt ns us ms s Setting range 0 ns to Pulse Period Continuous mode 0 ns to Pulse Period Pulse Width 0 8 x Leading Edge Ti
86. m it might change the output frequency because changing waveform types impacts the setting range of output frequency USER 1 USER2 USER3 USER4 EMEMory A user defined waveform saved in the user waveform memory or the EMEMory can be selected as an output waveform EFILe EFILe is specified as an output waveform SIN SQU PULS RAMP PRN DC SINC GAUS LOR ERIS EDEC HARV USER1 USER2 USER3 USER4 EMEMory EFILe SOURcel FUNCtion SHAPe SQUare selects the shape of CH 1 output waveform to square waveform SOURce 1 PHASe ADJust 2 56 Group Syntax Arguments This command sets or queries the phase of output waveform for the specified channel You can set the value in radians or degrees If no units are specified the default is RAD The query command returns the value in RAD This command is supported when you select a waveform other than DC Noise and Pulse Source SOURcCe 1 PHASe ADJust lt phase gt MINimum MAXimum SOURcCe 1 PHASe ADJust MINimum MAXimum lt phase gt lt NR3 gt lt units gt where lt NR3 gt is the phase of output frequency lt units gt RAD DEG If lt units gt are omitted RAD is specified automatically The setting ranges are RAD 2 PI to 2 PI relative to phase value DEG 360 to 360 relative to phase value AFG2021 Arbitrary Function Generator Programmer Manual Returns Examples Command Descriptions lt phase gt SOURCe
87. me Trailing Edge Time Triggered Gated burst mode lt delay gt SOURCe1 PULSe DELay 20ms sets the CH 1 lead delay to 20 ms AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions SOURce 1 PULSe HOLD Group Syntax Arguments Returns Examples The SOURce 1 PULSe HOLD command sets the instrument to hold either pulse width or pulse duty The SOURce 1 PULSe HOLD command returns WIDTh or DUTY Source SOURCe 1 PULSe HOLD WIDTh DUTY SOURce 1 PULSe HOLD WIDTh means that the instrument holds the pulse width setting DUTY means that the instrument holds the pulse duty setting WIDT DUTY SOURCe1 PULSe HOLD WIDTh holds the CH 1 pulse width setting SOURce 1 PULSe PERiod Group Syntax Arguments Returns AFG2021 Arbitrary Function Generator Programmer Manual This command sets or queries the period for pulse waveform Source SOURce 1 PULSe PERiod lt period gt MINimum MAXimum SOURce 1 PULSe PERiod MINimum MAXimum lt period gt lt NRf gt lt units gt where lt NRf gt is the pulse period lt units gt ns us ms s lt period gt 2 63 Command Descriptions Examples SOURCe1 PULSe PERiod 200ns sets the CH 1 pulse period to 200 ns SOURce 1 PULSe TRANsition LEADing Group Syntax Arguments Returns Examples This command sets or queries the leading edge time of pulse waveform S
88. n STB Read status byte STATus QUEStionable CONDition Return operation condition register STATus QUEStionable ENABle Set query operation enable register STATus QUEStionable EVENt Return operation event register STATus PRESet STATus QUEStionable CONDition Preset SCPI enable register Return questionable condition register STATus QUEStionable ENABle Set query questionable enable register STATus QUEStionable EVENt Return questionable event register System Commands System commands let you control miscellaneous instrument functions The following table lists and describes the System commands Table 2 13 System commands Header Description IDN Return identification information OPT Return option information RST Reset SYSTem BEEPer IMMediate Generate an audible tone SYSTem BEEPer STATe Set query beeper state SYSTem ERRor NEXT Return error event queue SYSTem KCLick STATe Set query click sound SYSTem KLOCK STATe Set query front panel lock unlock SYSTem PASSword CDISable Disable protected commands SYSTem PASSword CENable Enable protected commands to function SYSTem PASSword CENable STATe Return security protection state SYSTem PASSword NEW Change current password SYSTem SECurity IMMediate Reset to factory default SYSTem ULANguage Set query language for display screen SYSTem VERSion Return version information
89. ncy MINimum MAXimum SOURce 1 AM SOURce lt frequency gt lt NRf gt lt units gt where lt NRf gt is the modulation frequency lt units gt Hz kHz MHz lt frequency gt AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Examples SOURCeL AM INTernal FREQuency 10kHz sets the CH 1 internal modulation frequency to 10 kHz SOURce 1 AM INTernal FUNCtion This command sets or queries the modulating waveform of AM modulation for the specified channel You can use this command only when the internal modulation source is selected If you specify EFILe when there is no EFILe or the EFILe is not yet defined this command causes an error Group Source Syntax SOURce 1 AM INTernal FUNCtion SINusoid SQuare TRIangle RAMP NRAMp PRNoise USER 1 USER2 USER3 USER4 EMEMory EFILe SOURCe 1 AM INTernal FUNCtion Related Commands SOURce 1 AM SOURce SOURce 1 AM INTernal FUNCtion EFILe Arguments SINusoid SQUare TRIangle RAMP NRAMp PRNOise One of six types of function waveform can be selected as a modulating signal USER 1 USER2 USER3 USER4 EMEMory A user defined waveform saved in the user waveform memory or the EMEMory can be selected as a modulating signal EFILe EFILe is used as a modulating signal Returns SIN SQU TRI RAMP NRAM PRN USER1 USER2 USER3 USER4 EMEMory EFILe Examples SOURCe1 AM INTernal FUNCtion SQUare selects Square as
90. nding an arbitrary waveform to the instrument s Edit Memory and copying the contents of Edit Memory to the user waveform memory Private Sub Sample2_clickQ Assign resource Tvcl Descriptor GPIBO 11 INSTR Initialize of device setting Tvcl writeString RST Make arbitrary block data 2000 Points Dim wave 4000 As Byte For i 0 To 499 Leading edge 500 Points Data i Int 16382 500 Data range is from 0 to 16382 High Int Data 256 AFG s Data Format is big endian Low Data High 256 wave 2 i High wave 2 i 1 Low Next i AFG2021 Arbitrary Function Generator Programmer Manual Programming Examples For i 500 To 799 Part of High Level 800 Points Data 16382 High Int Data 256 Low Data High 256 wave 2 i High wave 2 i 1 Low Next i For i 800 To 999 Trailing Edge 200 Points Data 1000 i Int 16382 200 High Int Data 256 Low Data High 256 wave 2 i High wave 2 i 1 Low Next 7 For i 1000 To 1999 Part of Low Level 1000 Points Data 0 High Int Data 256 Low Data High 256 wave 2 i High wave 2 i 1 Low Next i Transfer waveform Transfer arbitrary block data to edit memory 1 Tvcl SendEndEnabled False Tvcl writeString TRACE DATA EMEMORY 44000 AFG2021 Arbitrary Function Generator Programmer Manual 4 3 Programming Examples 4 4 Tvcl SendEndEnabled True T
91. nerator Programmer Manual Command Descriptions Examples SOURCe1 PWM STATe ON enables the CH 1 PWM modulation SOURce 1 PWM DEViation DCYCle This command sets or queries the PWM deviation in percent for the specified channel The setting range must meet the following conditions Deviation lt Pulse Width PWmin Deviation lt Pulse Period Pulse Width PWmin Deviation lt Pulse Width 0 8 x Leading Edge Time Trailing Edge Time Deviation lt Pulse Period Pulse Width 0 8 x Leading Edge Time Trailing Edge Time where PWmin is the minimum pulse width Group Source Syntax SOURCe 1 PWM DEViation DCYCle lt percent gt MINimum MAXimum SOURCe 1 PWM DEViation DCYCle MINimum MAXimum Arguments lt percent gt lt NR2 gt lt units gt where lt NR2 gt is the PWM deviation lt units gt PCT Returns lt percent gt Examples SOURcCe1 PWM DEViation DCYCle 5 0 sets the CH 1 PWM deviation to 5 0 SOURce ROSCillator SOURce This command sets the reference clock to either internal or external Group Source AFG2021 Arbitrary Function Generator Programmer Manual 2 69 Command Descriptions Syntax Arguments Returns Examples SOURCe ROSCillator SOURCe INTernal ExTernal SOURCe ROSCi1 lator SOURCe INTernal means that the reference clock is set to internal EXTernal means that the reference clock is set to external INT EXT SOURCe ROSCillator SOURCe INT
92. ng the OPC command Operation Event Register OEVR This register has the same content as the Operation Condition Register AFG2021 Arbitrary Function Generator Programmer Manual 3 7 Status and Events 3 8 Operation Condition Register OCR The Operation Condition Register is made up of sixteen bits which note the occurrence of events as shown in the following figure 15 14 13 12 11 10 9 8 5 3 2 1 0 WTRIG WTRIG SWE CAL CH2 CH1 Figure 3 4 Operation Condition Register OCR Table 3 3 OCR bit functions Bit Function 15 to 8 Not used 5 WTRIG CH1 Waiting for Trigger Indicates whether the instrument is waiting for a trigger This bit is set when CH 1 is waiting for a trigger Bit is reset when the waiting for trigger status is canceled 4 Not used 3 SWE Sweep Indicates whether the instrument is executing a frequency sweep This bit is set when a frequency sweep is being executed on CH 1 Bitis reset when the execution stops 2 to1 Not used 0 CAL Calibration Indicates whether the instrument is being calibrated This bit is set when calibration is in progress and is reset when the calibration is complete Questionable Event Register QEVR This register has the same content as the Questionable Condition Register Questionable Condition Register QCR The Questionable Condition Register is made up
93. ng are examples of common queries m ESR E IDN AFG2021 Arbitrary Function Generator Programmer Manual 2 9 Command Syntax 2 10 AFG2021 Arbitrary Function Generator Programmer Manual Command Groups This section lists the commands organized by functional group The Command Descriptions section lists all commands alphabetically See page 2 17 Calibration and Diagnostic Commands Calibration and Diagnostic commands let you initiate the instrument self calibration routines and examine the results of diagnostic tests The following table lists the Calibration and Diagnostic commands Table 2 6 Calibration and Diagnostic commands Header Description CAL Perform self calibration and return result status CALibration ALL Perform self calibration DlAGnostic ALL Perform self test IST Perform self test and return result status Display Commands Display commands let you change the graticule style displayed brightness and other display attributes The following table lists and describes the Display commands Table 2 7 Display commands Header Description DISPlay BRIGhtness Set query the LCD display brightness DISPlay SAVer IMMediate Set screen saver DISPlay SAVer STATe Set query the screen saver settings DISPlay WINDow TEXT DATA Set query the text message display DISPlay WINDow TEXT CLEar Delete text message Memory Commands Memory commands let you change setup memory attributes
94. nstrument System SYSTem VERSi0n None lt SCPI Version gt YYYY V where YYYY indicates year V indicates the version number for that year SYSTEM VERSION might return 1999 0 TRACe DATA CATalog Query Only Group Syntax Arguments Returns Examples 2 88 This query only command returns the names of user waveform memory and edit memory Trace TRACe DATA CATalog None lt string gt A series of strings separated by commas is returned Each string is enclosed within quotation marks TRACE DATA CATALOG might return USER1 USER4 EMEM AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions This example indicates that waveform data of USER2 and USER3 are deleted and not saved Edit memory always has data TRACe DATA COPY No Query Form Group Syntax Arguments Examples TRACe DATA DATA Group Syntax Arguments Returns This command copies the contents of edit memory or user waveform memory to a specified user waveform memory or edit memory Trace TRACe DATA COPY lt trace_name gt EMEMory TRACe DATA COPY EMEMory USER 1 USER2 USER3 USER4 lt trace_name gt USER 1 USER2 USER3 USER4 This command is invalid when lt trace_name gt is being output DATA COPY USER1 EMEMory copies the waveform data in the edit memory to the user waveform memory USERI DATA COPY EMEMory USER1 copies
95. o devices can share the same device address Do not connect more than 15 devices to any one bus Connect one device for every 2 m 6 ft of cable used Do not use more than 20 m 65 ft of cable to connect devices to a bus Turn on at least 2 3 of the devices on the network while using the network Connect the devices on the network in a star or linear configuration as shown in the following figure Do not use loop or parallel configurations GPIB Device GPIB Device GPIB Device A Pa GPIB Device GPIB Device GPIB Device GPIB Device Figure 1 6 Typical GPIB network configurations When you use the GPIB port to communicate with an external controller follow these steps to set the address of the instrument 1 2 3 4 5 6 Press the Utility button Press the I O Interface button Press the GPIB button Press the Address button Turn the general purpose knob to set the GPIB Address Press the Return to up menu button when you have set the GPIB address to save the setting NOTE The GPIB address cannot be initialized by the RST command TekVISA is Tektronix implementation of VISA Virtual Instrument Software Architecture an industry standard communication protocol VISA provides AFG2021 Arbitrary Function Generator Programmer Manual Getting Started a common standard for software developers so that software from multiple vendors such as instrument drivers can run on the same platform Tek VIS
96. odulation to 1 0 MHz SOURce 1 FSKey INTernal RATE Group Syntax Arguments 2 52 This command sets or queries the internal modulation rate of FSK modulation for the specified channel You can use this command only when the internal modulation source is selected Source SOURCe 1 FSKey INTernal RATE lt rate gt MINimum MAXimum SOURCe 1 FSKey INTernal RATE MINimum MAXimum lt rate gt lt NRf gt lt units gt where lt NRf gt is the modulation rate lt units gt Hz kHz MHz AFG2021 Arbitrary Function Generator Programmer Manual Returns Examples Command Descriptions lt rate gt SOURCeL FSKey INTernal RATE 50Hz sets the CH 1 internal modulation rate to 50 Hz SOURce 1 FSKey SOURce Group Syntax Arguments Returns Examples This command sets or queries the source of modulation signal of FSK modulation for the specified channel Source SOURCe 1 FSKey SOURce INTernal EXTernal SOURCe 1 FSKey SOURCe INTernal means that the carrier waveform is modulated with an internal source EXTernal means that the carrier waveform is modulated with an external source INT EXT SOURCe1 FSKey SOURCe INTernal sets the CH 1 source of modulating signal to internal SOURce 1 FSKey STATe Group Syntax Arguments This command enables or disables FSK modulation The query command returns the state of FSK modulation You can select a sine square ramp
97. of sixteen bits which note the occurrence of two types of events 11 OVHP d 5 FREQ Figure 3 5 Questionable Condition Register QCR AFG2021 Arbitrary Function Generator Programmer Manual Status and Events Table 3 4 QCR bit functions Bit Function 15 to 12 Not used 11 OVHP Overheat protection Indicates whether the instrument internal temperature is in questionable condition 10 to 6 Not used 5 FREQ Frequency Indicates whether frequency accuracy of the signal is of questionable quality 4to0 Not used Enable Registers There are four types of enable registers m Event Status Enable Register ESER See page 3 9 Service Request Enable Register SRER See page 3 9 Operation Enable Register OENR See page 3 10 Questionable Enable Register QENR See page 3 10 Each bit in the enable registers corresponds to a bit in the controlling status register By setting and resetting the bits in the enable register you can determine whether or not events that occur will be registered to the status register and queue Event Status Enable Register ESER The ESER consists of bits defined exactly the same as bits 0 through 7 in the SESR register You can use this register to control whether or not the Event Status Bit ESB in the SBR should be set when an event has occurred and to determine if the corresponding SESR bit is set To
98. ommand places the ASCII character 1 into the output queue when all such OPC commands are complete Synchronization OPC OPC None lt execution complete gt 1 where 1 indicates that all pending operations are complete OPC might return to indicate that all pending OPC operations are finished This query only command returns a list of the options installed in your instrument System AFG2021 Arbitrary Function Generator Programmer Manual Syntax Arguments Returns Examples OUTPut 1 IMPedance Group Syntax Arguments Returns Examples Command Descriptions OPT None lt OPT gt lt OPT gt lt OPT gt lt OPT gt OPT might return 0 which indicates no option is installed in the instrument The OUTPut IMPedance command sets the output load impedance for the specified channel The specified value is used for amplitude offset and high low level settings You can set the impedance to any value from 1 Q to 10 kQ witha resolution of 1 Q or 3 digits The default value is 50 Q The OUTPut IMPedance command returns the current load impedance setting in ohms If the load impedance is set to INFinity the query command returns 9 9E 37 Output OUTPut 1 IMPedance lt ohms gt INFinity MINimum MAX7i mum OUTPUut 1 IMPedance MINimum MAXi mum lt ohms gt lt NR3 gt lt units gt where lt units gt OHM INFinity sets the load impedance to gt 10 kQ
99. on EFILe lt file_name gt SOURCe 1 PWM INTernal FUNCtion EFILe lt file_name gt lt string gt specifies a file name in the mass storage system The lt file_name gt includes path Path separators are forward slashes lt file_name gt AFG2021 Arbitrary Function Generator Programmer Manual 2 67 Command Descriptions Examples SOURCe1 PWM INTernal FUNCtion EFILe SAMPLE creates a file named SAMPLE1 in the mass storage SOURce 1 PWM SOURce Group Syntax Arguments Returns Examples This command sets or queries the source of modulating signal of PWM modulation for the specified channel Source SOURCe 1 PWM SOURCe INTernal ExXTernal SOURCe 1 PWM SOURCe INTernal means that the carrier waveform is modulated with the internal source EXTernal means that the carrier waveform is modulated with an external source INT EXT SOURCe1 PWM SOURCe INTernal sets the source of modulating signal on CH 1 to internal SOURce 1 PWM STATe Group Syntax Arguments Returns 2 68 This command enables or disables PWM modulation The query command returns the state of PWM modulation You can select only pulse waveform as a carrier waveform for PWM Source SOURCe 1 PWM STATe ON OFF lt NR1 gt SOURCe 1 PWM STATe ON or lt NR1 gt 40 enables PWM modulation OFF or lt NR1 gt 0 disables PWM modulation lt NR1 gt AFG2021 Arbitrary Function Ge
100. on Enable Register OENR The OENR consists of bits defined exactly the same as bits 0 through 15 in the OEVR shown in the following figure You can use this register to control whether or not the Operation Status Bit OSB in the SBR is set when an event occurs and the corresponding OEVR bit is set Use the STATus OPERation ENABle command to set the bits in the OENR Use the STATus OPERation ENABle query to read the contents of the OENR 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 WTRIG WTRIG SWE CAL CH2 CH1 Figure 3 8 Operation Enable Register OENR Questionable Enable Register QENR The QENR consists of bits defined exactly the same as bits 0 through 15 in the QEVR register as shown in the following figure You can use this register to control whether the QSB in the SBR is set when an event occurs and the corresponding QEVR bit is set Use the STATus QUEStionable ENABle command to set the bits in the QENR Use the STATus QUEStionable ENABle query to read the contents of the QENR 15 14 13 12 10 9 8 7 6 4 3 2 1 0 11 5 OVHP FREQ Figure 3 9 Questionable Enable Register QENR There are two types of queues in the status reporting system output queue and error event queues AFG2021 Arbitrary Function Generator Programmer Manual Status and Events Output Queue The output queue is an FIFO fi
101. ource SOURCe 1 PULSe TRANSition LEADing lt seconds gt MINimum MAXi mum SOURCe 1 PULSe TRANSition LEADing MINimum MAXimum lt seconds gt lt NRf gt lt units gt where lt NRf gt is the leading edge time of pulse waveform lt units gt ns us ms s lt seconds gt SOURCeL PULSe TRANSition LEADing 200ns sets the CH 1 leading edge time to 200 ns SOURce 1 PULSe TRANsition TRAiling Group Syntax Arguments 2 64 This command sets or queries the trailing edge time of pulse waveform Source SOURCe 1 PULSe TRANSition TRAiling lt seconds gt MINimum MAXi mum SOURCe 1 PULSe TRANSition TRAiling MINimum MAXimum lt seconds gt lt NRf gt lt units gt where lt NRf gt is the trailing edge of pulse waveform AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions lt units gt ns us ms s Returns lt seconds gt Examples SOURCe1 PULSe TRANSition TRAiling 200ns sets the trailing edge time to 200 ns SOURce 1 PULSe WIDTh This command sets or queries the pulse width for the specified channel Pulse Width Period x Duty Cycle 100 The pulse width must be less than the period The setting range is 0 001 to 99 999 in terms of duty cycle Pulse Width lt Pulse Period 0 8 x Leading Edge Time Trailing Edge Time Pulse Width gt 0 625 x Leading Edge Time Trailing Edge Time Group Source Syntax SOURCe 1
102. ps are automatically overwritten in the setup memory 0 last setup memory Mass Memory MMEMory LOAD STATe 1 2 3 4 lt file_name gt MEMory STATe LOCK MEMory STATe RECall AUTo MMEMory STORe STATe 1 2 3 or 4 specifies the location of setup memory lt file_name gt lt string gt specifies a setup file to be copied MMEMORY LOAD STATE 1 SETUP1 TFS copies a file named SETUP1 TFS in the mass storage into the internal memory location 1 MMEMory LOAD TRACe No Query Form Group This command copies a waveform data file in the mass storage system to Edit Memory If the file format is different this command causes an error Mass Memory AFG2021 Arbitrary Function Generator Programmer Manual 2 29 Command Descriptions Syntax Related Commands Arguments Examples MMEMory LOAD TRACe EMEMory lt file_name gt MMEMory STORe TRACe lt file_name gt lt string gt specifies a waveform data file to be copied MMEMORY LOAD TRACE EMEMory TEKOO1 TFW copies a file named TEK001 TFW in the mass storage into Edit Memory MMEMory LOCK STATe Group Syntax Arguments Returns Examples This command sets or queries whether to lock a file or directory in the mass storage system If you lock a file or directory you cannot overwrite or delete it Mass Memory MMEMory LOCK STATe lt file_name gt ON OFF lt NR1 gt MMEMory LOCK STATe lt fi1e_name gt ON or lt NR1 gt 0
103. rnal FREQuency lt frequency gt MINimum MAXimum SOURce 1 PM INTernal FREQuency MINimum MAXimum SOURce 1 PM SOURce lt frequency gt lt NRf gt lt units gt where lt NRf gt is the modulation frequency lt units gt Hz kHz MHz lt frequency gt SOURCeL PM INTernal FREQuency 10kHz sets the CH 1 internal modulation frequency to 10 kHz SOURce 1 PM INTernal FUNCtion 2 58 Group Syntax Related Commands This command sets or queries the modulating waveform of PM modulation for the specified channel You can use this command only when the internal modulation source is selected If you specify EFILe when there is no EFILe or the EFILe is not yet defined this command causes an error Source SOURcCe 1 PM INTernal FUNCtion SINusoid SQUare TRIangle RAMP NRAMp PRNoise USER 1 USER2 USER3 USER4 EMEMory EFILe SOURCe 1 PM INTernal FUNCtion SOURce 1 PM SOURce AFG2021 Arbitrary Function Generator Programmer Manual Arguments Returns Examples Command Descriptions SINuSOid SQUare TRIangle RAMP NRAMp PRNoise One of six types of function waveform can be selected as a modulating signal USER 1 USER2 USER3 USER4 EMEMory A user defined waveform saved in the user waveform memory or the EMEMory can be selected as a modulating signal EFILe EFILe is used as a modulating signal SIN SQU TRI RAMP NRAM PRN USER1 USER2 USER3 USER4 EMEMory EFILe
104. rst in first out queue that holds response messages to queries awaiting retrieval When there are messages in the queue the MAV bit in the SBR is set The output queue is emptied each time a command or query is received so the controller must read the output queue before the next command or query is issued If this is not done an error occurs and the output queue is emptied however the operation proceeds even if an error occurs Error Event Queue The event queue is an FIFO queue which stores events as they occur in the instrument If more than 64 events are stored the 64th event is replaced with event code 350 Queue Overflow The oldest error code and text are retrieved by using one of the following queries SYSTem ERRor NEXT First issue the ESR query to read the contents of the SESR The contents of the SESR are cleared after they are read If an SESR bit is set events are stacked in the Error Event Queue Retrieve the event code with the following command sequence ESR SYSTem ERRor NEXT If you omit the ESR query the SESR bit will remain set even if the event disappears from the Error Event Queue Messages and Codes Error and event codes with negative values are SCPI standard codes Error and event codes with positive values are unique to the AFG2021 instrument The following table lists event code definitions See Table 3 5 When an error occurs you can find its error class by checking for the co
105. s equipped with Tek VISA and a National Instruments GPIB board with the associated drivers TekVISA is the Tektronix implementation of the VISA Application Programming Interface API Tek VISA is industry compliant software for writing interoperable instrument drivers in a variety of Application Development Environments ADEs The example programs assume that the GPIB system recognizes the PC external controller as GPIBO and the address number of the instrument as 11 If you use an interface other than GPIB change the resource name of source code Refer to Tek VISA manual for details about resource Example 1 This is a sample program for setting the instrument outputs Private Sub Samplel_click Assign resource Tvcl Descriptor GPIBO 11 INSTR Initialize of device setting Tvcl writeString RST Set CH1 output parameters 1 Tvcl writeString FUNCTION SIN Set output waveform SIN Tvcl writeString FREQUENCY 10E3 Set frequency 10kHz Tvcl writeString C VOLTAGE AMPLITUDE 2 00 Set amplitude 2Vpp AFG2021 Arbitrary Function Generator Programmer Manual 4 1 Programming Examples Example 2 4 2 Tvcl writeString VOLTAGE OFFSET 1 00 Set offset 1v Tvcl writeString PHASE ADJUST ODEG Set phase Odegree Save settings and output on Tvcl writeString SAV 1 Save settings to Setup1 Tvcl writeString RCL 1 Recall settings from Setup1 End Sub This is a sample program for se
106. s the CH 1 source of modulating signal to internal This command enables or disables PM modulation The query command returns the state of PM modulation You can select a sine square ramp or arbitrary waveform for the carrier waveform Source SOURCe 1 PM STATe 0N OFF lt NR1 gt SOURcCe 1 PM STATe ON or lt NR1 gt 0 enables PM modulation OFF or lt NR1 gt 0 disables PM modulation lt NR1 gt SOURCe1 PM STATe ON enables the CH 1 PM modulation SOURce lt 3 gt POWer LEVel IMMediate AMPLitude 2 60 This command sets or queries the internal noise level which applies to the output signal for the specified channel The noise level represents the percent against current amplitude level The setting range is 0 to 50 AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions This command is available when Run Mode is set to Continuous Burst or Sweep You can set or query whether to add the internal noise to the output signal using the SOURce 1 COMBine FEED command Group Source Syntax SOURCe lt 3 gt POWer LEVel IMMediate AMPLi tude lt percent gt MINimum MAXimum SOURCe lt 3 gt POWer LEVel IMMediate AMPLitude MINimum MAXi mum Arguments lt percent gt lt NR2 gt lt units gt where lt NR2 gt is the noise level lt units gt PCT Returns lt percent gt Examples SOURCe3 POWer LEVel IMMediate AMPLitude 50PCT sets the internal noise
107. self test DIAGNOSTIC ALL performs a self test and returns a number indicating the outcome of the self test This command sets or queries the brightness of the LCD display Display DISPlay BRIGhtness lt brightness gt MINimum MAXimum DISPlay BRIGhtness lt brightness gt lt NR2 gt where lt NR2 gt is a range of display brightness from 0 00 through 1 00 resolution 3 digits step 5 The larger the value the higher the screen brightness MINimum sets the display to the lowest brightness level MAXimum sets the display to the highest brightness level lt NR2 gt AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Examples DISPLAY BRIGHTNESS MAXIMUM sets the display brightness to the highest level DISPlay SAVer IMMediate No Query Form This command sets the screen saver state to ON regardless of the DISPlay SAVer STATe command setting The screen saver is enabled immediately without waiting for five minutes Group Display Syntax DISPlay SAVer IMMediate Related Commands _ DISPlay SAVer STATe Arguments None Examples DISPLAY SAVER IMMEDIATE sets the screen saver state to ON DISPlay SAVer STATe This command sets or queries the screen saver setting of the LCD display When enabled the screen saver function starts automatically if no operations are applied to the instrument front panel for five minutes Group Display Syntax DISPlay SAVer STATe O
108. siinn cas Enar E O E OTT T EET E EET O E 4 1 Appendices Appendix A SCPI Conformance Information cc cece cece cece eee eee cnet ene ene e ene nnn e ed A 1 AFG2021 Arbitrary Function Generator Programmer Manual i Table of Contents ii AFG2021 Arbitrary Function Generator Programmer Manual Preface This manual provides operating information for the AFG2021 Arbitrary Function Generator The manual consists of the following sections Getting Started covers operating principles of the instrument which helps you understand how your generator operates m Syntax and Commands defines the command syntax and processing conventions describes command notation m Status and Events explains the status information and event messages reported by the instrument E Programming Examples contains remote interface application programs to help you develop programs for your application m Appendix A SCPI Conformance Information contains a list of commands and SCPI information Documentation In addition to this AFG2021 Arbitrary Function Generator Programmer Manual the following documentation is available for this instrument AFG2021 Arbitrary Function Generator Quick Start User Manual The quick start user manual provides information on installation general features operating the instrument and user interface Built in Help System The built in help system that is integrated with the User Interface application that
109. sound Returns lt NR1 gt Examples SYSTEM KCLICK STATE ON enables the click sound SYSTem KLOCK STATe This command locks or unlocks the instrument front panel controls The query command returns 0 OFF or 1 ON Group System Syntax SYSTem KLOCk STATe 0N OFF lt NR1 gt SYSTem KLOCk STATe Arguments ON or lt NR1 gt 0 locks front panel controls OFF or lt NR1 gt 0 unlocks front panel controls Returns lt NR1 gt Examples SYSTEM KLOCK STATE ON locks front panel controls SYSTem PASSword CDISable No Query Form Group Syntax Related Commands 2 84 This command disables protected commands The instrument security protection is activated System SYSTem PASSword CDISable lt password gt SYSTem PASSword CENable AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions SYSTem PASSword CENable STATe SYSTem PASSword NEW Arguments lt password gt lt string gt specifies current password The string is case sensitive Examples SYSTEM PASSWORD CDISABLE lt password gt activates the security protection SYSTem PASSword CENable No Query Form This command enables protected commands to function The instrument security protection is deactivated Group System Syntax SYSTem PASSword CENable lt password gt Related Commands SYSTem PASSword CDISable SYSTem PASSword CENable STATe SYSTem PASSword NEW Arguments lt password gt lt strin
110. system TRG Force trigger event TRIGger SEQuence MMediate Generate a trigger event TRIGger SEQuence SLOPe Set query the slope of trigger signal TRIGger SEQuence SOURce Set query the source of trigger signal TRIGger SEQuence TIMer Set query the period of internal clock Screen Copy Screen copy command copies screen image and saves it to a file Table 2 17 Screen copy command Header Description HCOPy SDUMp IMMediate Copy screen image and save the file to USB memory AFG2021 Arbitrary Function Generator Programmer Manual Command Descriptions Commands either set or query instrument values Some commands both set and query some only set and some only query Manual Conventions This manual uses the following conventions No Query Form indicates set only commands m A question mark appended to the commands and Query Only indicates query only commands m Fully spells out headers mnemonics and arguments with the minimal spelling shown in upper case for example to use the abbreviated form of the DISPlay BRIGhtness command just type DISP BRIG m Syntax of some commands varies depending on the model of instrument you are using differences are noted ABORt No Query Form Initializes all the current trigger system parameters and resets all trigger sequences Group Trigger Syntax ABORt Arguments None Examples ABORT resets the trigger system CAL Query Only This command performs an intern
111. the specified channel The query command returns the state of AM modulation AFG2021 Arbitrary Function Generator Programmer Manual Group Syntax Arguments Returns Examples Command Descriptions Source SOURCe 1 AM STATe 0ON OFF lt NR1 gt SOURce 1 AM STATe ON or lt NR1 gt 40 enables AM modulation OFF or lt NR1 gt 0 disables AM modulation lt NR1 gt SOURCe1 AM STATe ON enables the CH 1 AM modulation SOURce 1 BURSt MODE Group Syntax Arguments Returns Examples This command sets or queries the burst mode for the specified channel Source SOURCe 1 BURSt MODE TRIGgered GATed SOURce 1 BURSt MODE TRIGgered means that triggered mode is selected for burst mode GATed means that gated mode is selected for burst mode TRIG GAT SOURCe1 BURSt MODE TRIGgered selects triggered mode SOURce 1 BURSt NCYCles This command sets or queries the number of cycles burst count to be output in burst mode for the specified channel The query command returns 9 9E 37 if the burst count is set to INFinity AFG2021 Arbitrary Function Generator Programmer Manual 2 41 Command Descriptions Group Syntax Arguments Returns Examples Source SOURcCe 1 BURSt NCYCles lt cycles gt INFinity MINimum MAXimum SOURcCe 1 BURSt NCYCles MINimum MAXimum lt cycles gt lt NRf gt where lt NRf gt is the burst count The burst count ranges from 1 to
112. trary Function Generator Programmer Manual 2 47 Command Descriptions Group Syntax Related Commands Arguments Returns Examples Source SOURCe 1 FREQuency CENTer lt frequency gt MINimum MAXimum SOURCe 1 FREQuency CENTer MINimum MAXimum SOURce 1 FREQuency SPAN SOURce 1 FREQuency MODE lt frequency gt lt NRf gt lt units gt where lt NRf gt is the center frequency lt units gt Hz kHz MHz lt frequency gt SOURCeL FREQuency CENTer 550kHz sets the CH 1 center frequency to 550 kHz SOURce 1 FREQuency CW FIXed 2 48 Group Syntax Arguments This command sets or queries the frequency of output waveform for the specified channel This command is available when the Run Mode is set to other than Sweep The setting range of output frequency depends on the type of output waveform If you change the type of output waveform it might change the output frequency because changing waveform types impacts on the setting range of output frequency The resolution is 1 wHz or 12 digits For more information refer to the AFG2021 instrument Specifications and Performance Verification Manual Source SOURCe 1 FREQuency Cw FIXed lt frequency gt MINimum MAXimum SOURCe 1 FREQuency Cw FIXed MINimum MAXimum lt frequency gt lt NRf gt lt units gt where lt NRf gt is the output frequency AFG2021 Arbitrary Function Generator Programmer Manual
113. ut signal When the burst count is set to Inf Cycles in burst mode TRIGger indicates that the infinite number of cycles of waveform will be output from the Trigger Output connector When the burst count is set to Inf Cycles in burst mode SYNC indicates that one pulse waveform is output from the Trigger Output connector when the Inf Cycles starts When Run Mode is specified other than Burst Inf Cycles TRIGger and SYNC have the same effect Output OUTPut TRIGger MODE TRIGger SYNC OUTPut TRIGger MODE TRIGger means TRIGger is selected for Trigger Out SYNC means SYNC is selected for Trigger Out TRIG SYNC OUTPUT TRIGGER MODE SYNC outputs one cycle waveform from the Trigger Output connector when Inf Cycles starts This command sets and queries the power on status flag that controls the automatic power on execution of SRER and ESER When PSC is true SRER and ESER are set to 0 at power on When PSC is false the current values in the SRER and ESER are preserved in nonvolatile memory when power is shut off and are restored at power on Status PSC lt NR1 gt PSC AFG2021 Arbitrary Function Generator Programmer Manual 2 35 Command Descriptions Arguments Returns Examples RCL No Query Form Group Syntax Related Commands Arguments Examples RST No Query Form Group Syntax 2 36 lt NR1 gt 0 sets the power on status clear flag to false disables the power on clear an
114. vcl writeByteArray wave Copy contents of edit memory to USER1 Tvcl wWriteString TRAC COPY USER1 EMEM Set CH1 output parameters Tvcl writeString FUNCTION USERL Set output waveform USER1 Tvcl writeString FREQUENCY 8K Set frequency 8kHz Tvcl writeString OUTPUT ON Set CH1 output on End Sub AFG2021 Arbitrary Function Generator Programmer Manual Appendices Appendix A SCPI Conformance Information All commands in the instrument are based on SCPI Version 1999 0 The following table lists the SCPI commands the instrument supports Table A 1 SCPI conformance information Not Defined defined in SCPI in SCPI Command 1999 0 1999 0 ABORt N CALibration ALL N DIAGnostic ALL NI DISPlay BRIGhtness N SAVer STATe Ni SAVer IMMediate N WINDow TEXT DATA N CLEar N HCOPy SDUMp IMMediate MEMory STATe VALid J DELete Ni LOCK V RECall AUTo N MMEMory CATalog N CDIRectory N DELete Ni LOAD STATe N TRACe Ni LOCK STATe NI MDIRectory NI STORe STATe Ni TRACe NI OUTPut 1 IMPedance N POLarity N STATe Ni TRIGger MODE N SOURce ROSCillator SOURce N AFG2021 Arbitrary Function Generator Programmer Manual A 1 Appendix A SCPI Conformance Information Table A 1 SCPI conformance information cont Not Defined defined in SCPI in SCPI Command 1999 0 1999 0 AM STATe y
115. xamples This command sets or queries the slope of trigger signal Trigger TRIGger SEQuence SLOPe PoSitive NEGative TRIGger SEQuence SLOPe POSitive indicates that the event occurs on the rising edge of the external trigger signal NEGative indicates that the event occurs on the falling edge of the external trigger signal POS NEG TRIGGER SEQUENCE SLOPE POSitive sets the trigger slope to positive which triggers on the rising edge of the signal TRIGger SEQuence SOURce Group 2 94 This command sets or queries the trigger source for an external trigger signal Trigger AFG2021 Arbitrary Function Generator Programmer Manual Syntax Arguments Returns Examples Command Descriptions TRIGger SEQuence SOURCe TIMer ExXTernal TRIGger SEQuence SOURCe TIMer specifies an internal clock as the trigger source ExTernal specifies an external trigger input as the trigger source TIM EXT TRIGger SEQuence SOURCe EXTe rnal sets an external trigger input as the trigger source TRIGger SEQuence TIMer Group Syntax Related Commands Arguments Returns Examples This command sets or queries the period of an internal clock when you select the internal clock as the trigger source with the TRIGger SEQuence SOURce command The setting range is 1 us to 500 0 s Trigger TRIGger SEQuence TIMer lt seconds gt TRIGger SEQuence TIMer TRIGger SEQuence SOURce lt secon
116. y Function Generator Programmer Manual Command Syntax You can create commands and queries from these subsystem hierarchy trees Commands specify actions for the instrument to perform Queries return measurement data and information about parameter settings Creating Commands SCPI commands are created by stringing together the nodes of a subsystem hierarchy and separating each node by a colon In the figure above TRIGger is the root node and SEQuence SLOPe SOURce and TIMer are lower level nodes To create a SCPI command start with the root node TRIGger and move down the tree structure adding nodes until you reach the end of a branch Most commands and some queries have parameters you must include a value for these parameters If you specify a parameter value that is out of range the parameter will be set to a default value The command descriptions list the valid values for all parameters For example TRIGger SEQuence SOURce EXTernal is a valid SCPI command created from the hierarchy tree See Figure 2 1 Creating Queries To create a query start at the root node of a tree structure move down to the end of a branch and add a question mark TRIGger SEQuence SOURce is an example of a valid SCPI query using the hierarchy tree in the figure See Figure 2 1 Query Responses The query causes the instrument to return information about its status or settings When a query is sent to the instrument only the values are returned When th
117. ynchronization WAT OPC None WAT prevents the instrument from executing any further commands or queries until all pending commands that generate an OPC message are complete AFG2021 Arbitrary Function Generator Programmer Manual 2 97 Command Descriptions 2 98 AFG2021 Arbitrary Function Generator Programmer Manual Status and Events Status and Events This section provides details about the status information and events the instrument reports Status Reporting Structure The instrument status reporting functions conform to IEEE 488 2 and SCPI standards Use the status reporting function to check for instrument errors and to identify the types of events that have occurred on the instrument The following figure shows an outline of the instrument error and event reporting function The error and event reporting system consists of the following three blocks Standard Event Status m Operation Status Questionable Status The operations processed in these blocks are summarized in status bytes which provide the error and event data AFG2021 Arbitrary Function Generator Programmer Manual 3 1 Status and Events STATus QUEStionable CONDition STATus QUEStionable E VENt STATus QUEStionable ENABle lt bit_value gt Questionable Status Block FREQuency 1 Overheat Protection _ QCR QEVR QENR OCR OEVR OENR CALibrating

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