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Analogic DBS8750 Manual

1. eeennnee 3 24 4 1 CALC MATH Command Mnemonics amp Symbols 4 7 vii Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Figures 1 1 Waveform Synthesizer Block Diagram eene 1 1 2 1 DBS 8750 Jumper Selection LocationS eroernnnnne 2 2 2 2 TTLTRG Interface eese a nnne 2 4 2 3 Output Channel Connectors 1 amp 2 sees 2 6 3 1 DBS 8750 Command Set Quick Reference 3 2 3 2 DBS 8750 Front Panel eene 3 3 3 3 Simplified Output Stage Schematic esee 3 5 3 4 Output Voltage Characteristics 0vreeentsennaeenetarennesnnseane nt 3 6 3 5 Output vs Tracking Mode sese 3 7 3 6 Synchronizing the Track Hold seeeeeeeeeee 3 8 3 7 Track Hold Control for Sine Function sees 3 9 3 8 TRIG GATE Timing esee enne nnne 3 10 3 9 TTLTRG I O Functions eese eene nennen 3 11 3 10 Square Wave Generation with Internal External Clock 3 13 3 11 Complex Waveform By Segments eseeeeeeee 3 15 3 12 1 kHz Sine Wave Output seen entras 3 15 3 13 Log Function Output n eenrnennerenenanneneveveeneeneetanenann enne nnns 3 16 3 14 Exponential Output Wav
2. Sine wave SQUare Square wave TRlangle Triangle wave NOISe Random noise After all other parameters are set up frequency amplitude DC offset etc the selected output function appears at the output connector when the output channel is switched on by sending OUTPut 1 2 STATe ON 3 3 2 Selecting the Frequency The output signal frequency is set up by sending the following command does not apply to DC and NOISe functions SOURce 1 2 FREQuency n where n 12 5 to 20000 Hz for the Sine function 12 5 to 30000 Hz for the Square and Triangle functions 3 3 3 Selecting the Amplitude The output amplitude is set up by sending the following command SOURce 1 2 VOL Tage n where n 410 000 to 10 000 volts for a single ended output drive 45 000 to 5 000 volts for a differential output drive The numeric value n represents peak voltage To prevent clipping amplitude plus offset should not exceed full scale 3 3 4 Selecting the DC Offset The dc output offset is set up by sending the following command SOURce 1 2 VOLTage OF Fset n where n 10 000 to 10 000 volts Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation 3 3 5 Selecting the Drive Mode Each channel can be configured for single ended or differential output drive mode Figure 3 3 shows a simplified schematic of the output stage
3. sese 3 6 3 3 7 Selecting the Filter renoveroranonvrorresnnnnnvennsnnnnnnensenevnvnannsersane 3 6 v Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com vi Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 3 4 3 5 3 6 3 7 3 8 3 3 8 Using Track and Hold eee 3 7 3 3 8 1 Tracking Mode seen 3 7 3 3 8 2 Track and Hold Synchronization 3 8 3 3 8 3 Controlling Track and Hold with a Front Panel CLOCK seen 3 8 3 3 9 Using the Deglitching Filter eee 3 9 3 3 10 Switching the Output Channel State to On Off 3 10 3 3 11 Selecting the GATE Delay eee 3 10 3 3 12 Synchronizing the Output Channels eene 3 11 3 3 13 Using the TTL Trigger Lines eem 3 11 3 3 14 Generating Clean SquareStaircase Waves 3 12 GENERATING ARBITRARY WAVEFORMS eee 3 14 3 4 1 SOURce FUNCtion USER Waveforms eene 3 14 3 4 2 SOURce FUNCtion MEMory Waveforms nere 3 17 DSP USER MEMORY eenrenvesversvrnnennnvsnnennesnvrvars nnsvaneraserevsnssannsveennsen 3 17 3 5 1 Creating Memory Buffers see 3 17 3 5 2 Saving Waveforms rruevsvesreveenrsnerrrnsensserennnsr
4. 00 EEE EEE TE E EE A ESS The analog output section is isolated from the digital section of the card by a 500 volt de barrier High speed pulse transformers couple the data and control signals across the barrier As each waveform memory outputs 16 bit parallel data words a parallel to serial shift register feeds a serial bit stream over the barrier while on the floating side a serial to parallel shift register reverses the process To maintain proper DAC synchronization the 16 MHz master clock as well as the track and hold and load control signals are passed across the barrier using separate transformers Under precision timing control digital data from each DAC memory is converted to analog signals by a highly accurate 18 bit dual DAC Each DAC converts data at the sampling rate and provides its own stable refer ence and two distortion suppressing output deglitcher amplifiers Each DAC output is fed into a 6 pole reconstruction low pass filter which can be switched into the analog path to eliminate higher frequencies when harmonically clean signals are required A programmable attenuator feeds the filtered signal to the output amplifier The output amplifier can be configured for either a single ended or differential output with AC or DC coupling and with 50 or 600 ohms of output impedance When finer attenuation steps are required sending the appropriate commands to the DSP produces digitally scaled data within the full 16 bit resol
5. name of memory buffer 32 characters max Example To transfer 1024 words from VDATA to VXI memory starting at VXI memory address 200000h MEM WRITe 200000 1024 VDATA Related Commands All other MEMory commands Reset Condition All buffers in SRAM are deleted MEMory READ Description Initiates a DMA read cycle to transfer a block of data from VXI memory to a specified DSP User Memory buffer Syntax MEMory READ lt sp gt lt VXI Addr gt lt sp gt lt Npts gt lt sp gt lt Buffer Name gt lt VXI Addr gt Starting address of the VXI memory block to be read Npts s Number of data points bytes to be read Npts must not exceed the amount of free memory see MEM FREE minus 35 points for buffer overhead Buffer Name Name of memory buffer 32 characters max Notes 1 If the specified buffer does not exist a new one is created If the buffer already exists the previous waveform data is lost If enough memory cannot be allocated for the user buffer an error message is generated and the buffer is not created 2 Ifthe buffer exists and a subsequent read requires a larger buffer the program attempts to re size the buffer If this fails an error message is generated and enough memory is re allocated for the original buffer However the data in the original buffer may be corrupted 3 All DBS 8750 buffers are BINary Up to 20 user buffers may be created 4 12 Artisan Technology
6. Select user defined function OUTP2 FILT OFF STAT ON Select filter off output ON TRIG2 SEQ1 COUN 1 Set SEQuence1 Counter to 1 TRIG2 SEQI ISTOP End of SEQuencet TRIG2 SEQ2 ISTAR Start of SEQuence2 for OUT2 SOUR2 FUNC SQU Select square wave SOUR2 VOLT 1 FREQ 400 Select 1 volt amplitude 400 Hz TRIG2 SEQ2 COUN 5 Set SEQuence1 Counter to 5 TRIG2 SEQ2 STOP End of SEQuence2 TRIG2 COUN O eee Select Free Running Mode INIT sic erret eri Arm trigger sequence NOTE Because of the methods used to calculate waveforms the actual output may not appear exactly as illustrated Figure 3 20 Example 43 Output Wave SEQuence1 SEQuence1 USER 5 cycles DAC 2 Waveform Memory 32K Based on 400 kHz Internal Clock and Number of Points Internal Trigger This complex wave is continuously generated in the Free Running mode OUT2 3 28 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation 3 7 CLOCK SOURCES The Digital to Analog Converter DAC is updated with new data by the Sampling Rate Clock The clock is selected with the following command SOURce ROSCillator SOURce INT EXT TTLTrg lt 0 7 gt INT 400 kHz Internal Sampling Rate Clock EXT External Sampling Rate Clock Front Panel CLOCK BNC Figure 3 21 A
7. A rtisan Artisan Technology Group is your source for quality TecmologyGrap new and certified used pre owned equipment FAST SHIPPING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment EQUIPMENT DEMOS HUNDREDS OF Instra 4 REMOTE INSPECTION LOOKING FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at www instraview com information on price quotations drivers technical LEASING MONTHLY specifications manuals and documentation RENTALS ITAR CERTIFIED RR aed Contact us 888 88 SOURCE sales artisantg com www artisantg com User s Manual DBS 8750 High Precision Arbitrary Waveform Synthesizer ANIALOGIC E Th for Precision Signal Technology Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Proprietary Statement The information contained in this publication is derived in part from proprietary and patent data of the Analogic Corporation This information has been prepared for the express purpose of assisting operating and maintenance personnel in the efficient use
8. Reset Condition OUTPut 1 2 DIFFerential 4 18 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com OUTPut Subsystem OUTPut TRACK DBS 8750 OUTPut GAT DELay OUTPut TRACK Description Selects Tracking Mode Syntax OUTPut TRACk lt sp gt lt boolean gt Query OUTP TRAC Boolean Parameters ON or 1 Track Only OFF or O Track and Hold Notes 1 In the Track and Hold mode OUTPut TRACk OFF noise spikes appear on the output The output filter can be switched on to reduce the effect If the output filter is not used configure the deglitching filter to be in line jumper selection required 2 Use the Track Only Mode to generate DC and square waves Code dependent glitch energy is increased in the Track Only Mode 4 Using the deglitching filter increases square wave settling times Disconnect the deglitching filter to reduce settling times Example To select Track Only Mode OUTP TRACk ON Related Commands None Reset Condition OUTPut TRACk OFF OUTPut GAT DELay Description Sets the amount of time to delay the GATE output following an input trigger signal Syntax OUTPut GAT DELay lt sp gt lt numeric gt Query OUTP GAT DELay Numeric Parameters 0 00002 to 41 945 seconds in steps of 2 5 us Example To set the output gate delay to 100 usec OUTP GAT DEL 0 0001 Related Commands None Reset Condition Delay is set to zero 0 For ha
9. ment If necessary contact the carrier to file a claim Save the shipping carton and packing materials if for any reason you need to return the product for repair or replacement For technical support or to return this product to the factory refer to Section 1 2 for instructions CAUTION This product contains components which are sensitive to electrostatic discharge ESD Be sure to follow proper A procedures for handling storing and transporting ESD sensitive assemblies 2 2 HARDWARE JUMPERS Before installing this instrument in a chassis check Table 2 1 which lists jumper selections made at the factory before shipment To change any factory selection refer to Figure 2 1 and the referenced Section Table 2 1 Hardware Jumper Factory Setup Summary Factory Selection VXI Logical Address JP1 1 to JP1 2 JP2 1 to JP2 2 JP3 2 to JP3 3 JP4 1 to JP4 2 JP5 1 to JP5 2 JP6 1 to JP6 2 JP7 1 to JP7 2 JP8 2 to JP8 3 Address Space 12 2 2 A24 JP10 1 to JP10 2 Sampling Rate Clock Output 2 2 3 TILTRGO JP19 1 to JP19 2 Deglitching Filter JP21 2 to JP21 3 JP22 2 to JP22 3 5 E 5 o Factory Setup Only N A JP9 2 to JP9 3 JP11 2 to JP11 3 For hardware revision 1 and up only See Appendix D for revision 0 hardware jumpers 2 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Figure 2 1 DBS 8750 Jumper Selection L
10. 28 29 30 31 32 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual B 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix C Error Messages OPERATIONAL ERROR MESSAGES 0 No error 100 Command error command not implemented 100 Command error missing right parentheses 100 Command error missing left parentheses 100 Command error expecting waveform directive FOR 100 Command error incomplete waveform specification 100 Command error duration field must evaluate to a constant 102 Syntax error 200 Execution error DMA controller is already in use 200 Execution error no buffers defined 200 Execution error buffer not found 200 Execution error user buffer too small for requested transfer size 210 Trigger error trigger system is currently active 210 Trigger error invalid trigger sequence definition 210 Trigger error no more trigger sequences available 210 Trigger error no user function defined 210 Trigger error trigger seguence too long 210 Trigger error no trigger sequences defined 210 Trigger error user functions are invalid in trigger sequences 222 Data out of range 225 Out of memory cannot allocate memory for buffer 225 Out of memory cannot re
11. 3 18 A maximum of 20 memory buffers may be created Any attempt to create more than that generates an error message However the number of buffers that can be created also depends upon the number of data points words being written into each buffer The number of data points Npts in a waveform is determined by dividing the Sampling Rate Clock Frequency by the frequency of the output waveform Equation 1 For example using the 400 kHz Internal Sampling Rate Clock a 400 Hz sine wave consists of 1 000 points Equation 2 At the same rate a 20 kHz sinewave consists of only 20 points but a 23 5 Hz sinewave consists of 17021 pts which nearly fills the entire user memory space by itself Sampling Rate Clock Frequency F F Np E tion 1 Output Function Frequency ts Equation 1 lt 1000 pts Equation 2 400 Hz j NOTE ADC function always generates 100 points and the NOISe function always generates 8192 points The user memory space is written contiguously starting at the Memory Base Address as each buffer is created That is the memory is filled with one buffer after another with no gaps in between The scenario depicted in Figure 3 16 demonstrates how this memory might be used In this diagram the numbered arrows indicate the direction of data transfer the numbers indicate the sequence in which the commands were performed First the user generated 1 a standard 400 kHz 1000 pts sine wave on channel 1 and saved it 2 to a
12. This generates the mini mum number of interrupts to the DSP and ensures better performance 5 Always send the INITiate command last after the complete sequence has been defined 3 24 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation KOT SAAD 6 OUTPut commands may be included in a trigger seguence but are executed only once following the INITiate command 7 When using an External Trigger signal it must be held low for the entire duration of the Trigger Seguence output including all repeat loops 8 To generate a waveform in the free running mode set the repeat count to zero In other words include the command TRIG COUN 0 Table 3 2 Trigger Seguence Control Commands Command frunetton TRIGger 1 2 SEQuence 1 2 STARt Defines the beginning of a Trigger Sequence SEQ1 must always precede SEQ2 TRIGger 1 2 SEQuence 1 2 STOP Defines the end of a Trigger Sequence TRIGger 1 2 SEQuence 1 2 COUNt Sets the sequence counter which controls the number of times to repeat the commands of the sequence This statement must be sent between the STARt and STOP commands This count determines the number of waveform cycles that are to be written in waveform memory This value should always be as high as possible However maximum COUNt is limited by waveform memory size The total number of points generated by the trigger sequences must be less
13. or M Mega these are not recognized by the firmware 2 Expressions are always evaluated from right to left and should fit on one line If an expression does not fit perform some precalculations Use parentheses to group quantities properly 3 CALCulate commands may consist of up to 16 segments and 859 characters maximum Each segment is defined by a FOR sp duration voltage statement 4 Total USER function output must be equal to or less than 32K points which is the maximum capacity of the DAC 1 or 2 Waveform Memory Examples 1 To calculate a 1 KHz 5 volt sine wave on channel 2 CALC2 MATH FOR 0 001 5 SIN 2 PI t 1000 SOUR2 FUNC USER 2 Tocalculate a 1 KHz 5 volt sine wave on channel 1 CALC1 MATH FOR 0 001 5 SIN 2 PI t 1000 SOUR1 FUNC USER Related Commands SOUR FUNC USER Reset Condition All programmed CALC MATH functions are erased Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com CALCulate Subsystem CALCulate MATH DBS 8750 Command Reference Table 4 1 CALC MATH Command Mnemonics amp Symbols Mnemonic or Symbol Function or Meaning Positive value addition Negative value subtraction ultiply ivide Raised to the power Parentheses 2 7182818 3 1415927 Cosine Tangent Arc sine Arc cosine Arc tangent IN Natural iog basee ABS Absolute value Lt Time variable t 0 at start 4
14. 0 No Error Self test PASSED 330 Self test failed Static RAM failed self test 330 Self test failed DAC RAM 0 memory error 330 Self test failed DAC RAM 1 memory error 330 Self test failed DAC control register error 330 Self test failed DAC rate register error 330 Self test failed DAC 0 address register error 330 Self test failed DAC 1 address register error 330 Self test failed VME offset register error 330 Self test failed VME control register error 330 Self test failed EPROM memory error 330 Self test failed DAC Analog output error Notes 1 Running DIAGnostic doesn t affect signal generation 2 If no errors are detected the following message is returned 0 No Error Self test PASSED Example DIAG Reset Condition Reflects the status of the last diagnostic test performed 4 11 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com MEMory WRiTe MEMory Subsystem MEMory READ DBS 8750 MEMory WRITe Description Initiates a DMA write cycle to transfer a specified number of data points words from a buffer in DSP User Memory to VXI memory Syntax MEMory WRITe lt sp gt lt VXI Addr gt lt sp gt lt Npts gt lt sp gt lt Buffer Name gt lt VXI Addr gt VXI starting memory address Npts s number of data points in the buffer Buffer Name
15. 1 kHz OUTP1 DRIV SING Select single ended output OUTP1 FILT OFF STAT ON Select filter off output ON TRIG1 SEQ1 COUN 3 Set SEQuence1 Counter to 3 TRIGI SEQIISTOP End of SEQuencet TRIGI SEQ2 STAR Start of SEQuence2 for OUT 1 SOUR1 FUNC TRI Select triangle wave SOUR1 VOLT 10 FREQ 1000 Select 10 volt amplitude 1 kHz TRIG1 SEQ2 COUN 2 Set SEQuence2 Counter to 2 TRIG1 SEQ1 STOP sss End of SEQuence2 TRIG1 COUN 4 Set Repeat Counter to 4 INITT eet Arm trigger sequence for OUT1 NOTE Because of the methods used to calculate waveforms the actual output may not appear exactly as illustrated Figure 3 18 Example 1 Output Wave SEQuence1 SEQuence2 3 cycles 2 cycles DAC 1 Waveform Memory 32K Based on 400 kHz 1 t i 1 400 800 1200 1600 Internal Clock and Number of Points Internal Trigger TRIG1 COUN 4 repeats the entire complex wave 4 times creating a burst of 20 cycles on OUT 1 I LI LI 1 4 LI 3 26 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation EEE ES EEE VE ea AA 363 3 Example 2 Sine Wave Burst External Trigger The following generates 10 cycles of a 800 Hz Sine Wave triggerred externally Note that the EXT TRIG input signal is held
16. 3 2 Trigger Sequences allow you combine various types of standard and or user defined wave shapes to generate complex output waveforms The defined Trigger Sequence can be generated as a single burst of a defined number of cycles or it can be generated continu ously in a Free Running mode The following three examples describe an internally triggerred complex wave burst an externally triggerred sine wave burst and a free running complex wave NOTE In order for Trigger Sequences to run correctly the DBS 8750 must be equipped with firmware revision 2 0 or higher To determine hardware software revision levels refer to the IDN command in Section 4 3 6 3 1 Programming Guidelines When creating Trigger Sequences bear in mind the following guidelines 1 Only two trigger sequences are allowed per channel When sending the commands SEQuence1 must always precede SEOuence2 2 The beginning and end of a sequence must be defined by a TRIG 1 2 SEQ 1 2 STARt command and a TRIG 1 2 SEQ 1 2 STOP command respectively 3 Since the defined sequence is created in 32K word DAC Waveform Memory the aggregate number of points generated by the trigger sequence s must be less than or equal to 32K points 4 Asa general pratice always strive to fill waveform memory with as many waveform cycles as possible TRIG SEQ COUNt Highest Possible Value and set the repeat count as low as possible TRIG COUNt Lowest Possible Value
17. 7 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DIAGnostic EPRom DIAGnostic Subsystem DIAGnostic SRAM DBS 8750 DIAGnostic EPRom Description Calculates an EPROM checksum and compares it with the correct checksum stored in EPROM If the numbers match the test passes and the green LED is switched on Syntax DIAGnostic EPRom Notes Command has no effect on signal generation Example DIAG EPR Reset Condition This diagnostic is included in the self test diagnostics which are invoked by a reset command DIAGnostic SRAM Description Reports the status of the SRAM DSP User Memory Diagnostic Test following the last reset or power on sequence This command does not perform a SRAM diagnostic test in which all system memory is over written Syntax DIAGnostic SRAM Notes To run the SRAM diagnostic test do one of three actions a Cycle the power off and then on again b Press the front panel reset push button c Send the RST Reset command The SRAM diagnostic test does not test the DAC Waveform Memories This command does not effect signal generation Example DIAG SRAM Reset Condition This diagnostic is included in the self test diagnostics which are invoked by a reset command Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DIAGnostic Subsystem DIAGnostic ANALog DBS 8750 Command Reference DIAG
18. DAC Waveform Memory The DSP User Memory provides user accessible read write space for 17 150 words See Section 3 5 3 5 DSP USER MEMORY The DSP User Memory has a total of 17 150 words of user space available for saving a waveform currently residing in DAC Waveform Memory or for transferring data from VXI memory or an external source such as an adjacent Digitizer module via the LOCALbus NOTE The DSP User Memory Is RAM All data is lost when power Is removed from the DBS 8750 Be sure to save all important data to another memory device before switching power off After power on this memory contains random data This memory is not initialized during the power on sequence 3 5 1 Creating Memory Buffers Memory buffers are created in the DSP User Memory whenever any of the following commands are used MEMory SAV1 2 MEMory READ MEMory ACQuire and MEMory MALLocate The creation of each new memory buffer requires 35 words of space for identification and housekeeping Therefore when estimating mernory space requirements bear in mind that the size of each buffer is determined by the number of points words comprising the waveform plus 35 This means that if three 1000 point waveforms are saved the amount of actual memory space occupied is 3 105 points 3 x 1000 3 x 35 3105 3 17 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 5 2
19. INITiate again ABORt affects only the Trigger Subsystem Syntax ABORt 1 2 Notes 1 After ABORt is executed the output control conditions output state filter drive attenuation etc stay as set by the TRIGger sequence commands 2 The designation 1 2 following the keyword ABORI is used to select the channel being programmed 3 ABORt does not affect any other setting in the DBS 8750 Example Aborting a trigger sequence ABOR Related Commands TRIGger SEQuence INITiate Reset Condition Erases all pre programmed TRIGger SEQuences 4 33 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com CLS ESR System Commands ESE DN DBS 8750 Command Reference CLS Description Clear Status clears all registers in the instrument Syntax CLS Related Commands None Reset Condition No effect ESE Description Event Status Enable sets the DBS 8750 Event Status Enable register to a number between 0 and 255 ESE returns the previously set value The event status register of the DBS 8750 has no operational meaning for the DBS 8750 Syntax ESE lt 0 255 gt Related Commands None Reset Condition The Event Status Enable register is 0 ESR Description Event Status Register Query returns the value of the Event Status register This register has no operational meaning to the DBS 8750 Syntax ESR Reset Condition The Event status
20. JP10 3 2 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 2 2 3 Selecting TTL Trigger Lines The TTL trigger lines can be used for additional triggering and synchroniza tion capabilities As shown in Figure 2 2 the selected Sampling Rate Clock can be jumper selected to drive TTLTRG line 0 1 2 or 3 The GATE output from the front panel can be jumper selected to drive TTLTRG 4 5 6 or 7 Table 2 4 lists the available jumper selections Before one of these signals can drive the bus the TTLTRG line drivers must first be enabled by command OUTPut TTLTrg ON OFF Also an External Sampling Rate Clock input can be received on any unused TTLTRG line The input clock is software selected using the command SOURce ROSCillator SOURce TTLTRG lt 0 7 gt Figure 2 2 TTLTRG Interfacet TTLTRG7 TTLTRG6 i TTLTRGS TTLTRG4 Sampling TTLTRG3 Rate Clock A TILTRG Select TTLTRG1 TTLTRG Trigger In Table 2 4 TTL Trigger Line Output Selections Jumper Setting Connection Sampling Rate Clock onto TTLTRGO Sampling Rate Clock onto TTLTRG1 Sampling Rate Clock onto TTLTRG2 Sampling Rate Clock onto TTLTRG3 GATE output pulse onto TTLTRG4 GATE output pulse onto TTLTRG5 GATE output pulse onto TTLTRG6 GATE output pulse onto TTLTRG7 Factory Selection For hardware revision 1 and up only See Append
21. To generate a sine wave signal synchronously using an External Sam pling Rate Clock use SOUR ROSC SOUR AUTO SHON Example To synchronize Track and Hold with the Front Panel CLOCK input SOUR ROSC SOUR AUTO SHON Related Commands SOURce ROSC SOURce EXT Reset Condition Sends SOURce ROSCillator SOURce AUTO SHOF 4 27 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TRIGger SEQuence STARt TRiGger Subsystem DBS 8750 Command Reference NOTE In order for Trigger Sequences to run correctly the DBS 8750 must be equipped with firmware revision 2 0 or higher To determine hardware software revision levels refer to the IDN command In Section 4 TRIGger SEOuence STARt Description Defines the beginning of a Trigger Seguence SEQ1 must precede SEQ2 Syntax The TRIGger 1 2 SEQuence 1 2 STARt Query None Notes 1 To program each Trigger Sequence send the following set of commands TRIGger 1 2 SEQuence 1 2 STARt e e sequence definition statements TRIGger 1 2 SEQuence 1 2 STOP 2 The designation 1 2 following the keyword TRIGger is used to select the channel being programmed 3 Two TRIGger sequences are allowed per channel The designation 2 following the keyword SEQuence is used to delineate sequence 1 from sequence 2 4 Always start a trigger sequence by sending the command INITiate The sequence can be stopped anytime
22. Tree Figure 4 1 Associated commands are organized into groups each under a common subsystem The command mnemonics are called key words Indentation of the keywords shows the hierarchy within the com mand tree A colon is used to separate one command tree level from another such as in SOURce ROSCillator SOURce TTLTrg lt 0 7 gt NOTE When programming this instrument It is necessary to read the Data Low Register after sending every command except Reset RST The normal response is the new line character xOA or a status message 4 2 1 Abbreviated Commands Most commands use upper and lower case letters Upper case letters indicate the abbreviated form of the command For example if a keyword is written as SOURce then SOUR and SOURCE are acceptable forms Other forms will generate an error Although commands amp queries are shown in the examples as uppercase characters the DBS 8750 is not case sensitive 4 2 2 Command Concatenation A semi colon is used to concatenate commands within a common sub system Figure 4 2 shows and example using the three separate commands on the left and writes them in the concatenated format on the right Concat enated commands are more efficient because they require fewer read back commands and therefore fewer bus cycles 4 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Figure 4 1 DBS 8750 Command Tree C
23. USED NOT USED NOT USED NOT USED GND GND NOT USED NOT USED NOT USED NOT USED LBUSCO NOT USED NOT USED LBUSC1 NOT USED NOT USED GND NOT USED NOT USED LBUSC2 NOT USED NOT USED LBUSC3 GND NOT USED GND NOT USED NOT USED LBUSC4 NOT USED GND LBUSCS NOT USED 5VD NOT USED NOT USED NOT USED LBUSC6 NOT USED NOT USED LBUSC7 GND NOT USED GND NOT USED NOT USED LDHI NOT USED NOT USED LDLO NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED GND GND GND TILTRGO NOTUSED TTLTRG1 TILTRG2 NOT USED TTLTRG3 NOT USED NOT USED GND TTLTRG4 NOT USED TTLTRGS TILTRG6 NOT USED TTLTRG GND NOT USED GND NOT USED NOT USED NOT USED MODID NOT USED GND GND GND NOT USED NOT USED SVD NOT USED VDB9 VACFAIL VDB10 VBGOINL VDB11 VBGOOUTL VDB12 VBGIINL VDB13 VBG1OUTL VDB14 VBG2INL VDB15 VBG2OUTL GND VSYSCLK VBGSINL VSYSFAIL GND VBG3OUTL VBERRL VOSL1 VSYSRSTL VDSLO VLWORDL VWRITEL VAMS GND VA23 VDTACKL VAMO VA22 GND VAM1 VA21 VASL VAM2 VA20 GND VAM3 VA19 VIACKL GND VA18 VIACKINL NOT USED VA17 VIACKOUT NOT USED VA16 VAM4 GND VA15 VAZ VIRQL7 VA14 VAB VIRALE VAIS VAS VIRQLS VA12 VAA VIRQL4 VA11 VAS VIRQL3 VA10 VA2 VIRQL2 VAG VAI VIRQL1 VAB NOT USED NOT USED NOT USED SVD SVD Berg een eaasaeonn 1 2 3 4 s 6 7 8 9 10 1 12 13 14 15 16 17 18 19 20 21 2 23 24 2 26 27 28 29 30 31 az 17 18 19 20 21 22 23 24 25 26 27
24. Use Only D 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Selecting TTL Trigger Lines os The TTL trigger lines can be used for additional triggering and synchroniza tion capabilities The selected Sampling Rate Clock can be jumper selected to drive one of the eight TTLTRG lines Before the selected clock signal can drive the bus the TTLTRG line drivers must first be enabled by command OUTPut TTLTrg ON OFF Also an External Sampling Rate Clock input can be received on any unused TTLTRG line The input clock is software selected using the command SOURce ROSCillator SOURce TTLTRG lt 0 7 gt TTLTRG Interface Revision 0 Hardware Sampling Rate Clock TTLTRG2 TTLTRG1 Trigger In D 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com A rtisan Artisan Technology Group is your source for quality TecmologyGrap new and certified used pre owned equipment FAST SHIPPING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment EQUIPMENT DEMOS HUNDREDS OF Instra 4 REMOTE INSPECTION LOOKI
25. User Memory by creating a buffer of a specified point size The command reponse is either the buffer s offset in hexidecimal from the VXI A24 base address or the error message 225 Out of memory cannot allocate memory for buffer Syntax MEMory MALLocate lt sp gt lt Buffer Name gt lt sp gt lt Npts gt lt Buffer Name gt Up to 31 characters excluding whitespace colons and semicolons Npts errnarnrnansrverser A positive decimal integer representing the number of data points allocated to the buffer lt Npts gt must not exceed the amount of free memory see MEM FREE minus 35 points for buffer overhead Notes 1 The DBS 8750 must allocate contiguous blocks of memory If you have been creating and deleting buffers this command may fail even though the total amount of free memory is sufficient 2 This command can be used to re size an existing named buffer Ifa sufficient amount of contiguous memory space is not available the command may fail and generate error message 225 Out of memory cannot resize the buffer 3 The 8750 frees existing buffer memory before attempting to reallocate the buffer If resizing fails the buffer re allocates memory to the original size and data in the existing buffer may be corrupted Since only 16 bit transfers are allowed only EVEN addresses are valid The DBS 8750 is a bus master during data transfers 6 Buffers defined by this command are not initialized by the 8
26. a list of possible error messages 3 2 CONTROLS AND INDICATORS Figure 3 2 describes the control inputs and indicators on the front panel After making jumper selections and installing the instrument all inputs and outputs are operated by software commands Note that input coupling and input impedance are selected using front panel switches rather than using software commands 3 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Ed Figure 3 1 DBS 8750 Command Set Quick Reference CALCulate Subsystem CALCulate MATH Segment 1 gt Segment 2 Segment 3 Segment 16 DIAGnostic Subsystem DIAGnostic EPRom SRAM ANALog DRAM REGS ALL MEMory Subsystem WRITe lt sp gt lt VXI Addr gt lt sp gt lt Npts gt lt sp gt lt Buffer Name READ lt sp gt lt VXI Addr gt lt sp gt lt Npts gt lt sp gt lt Buffer Name gt SAV 1 2 lt sp gt lt Buffer Name ACQuire lt sp gt lt Npts gt lt sp gt lt Buffer Name gt CATalog ALL BlNary DELete lt sp gt lt Buffer Name gt ALL FREE ALL BiNary MALLocate lt sp gt lt Buffer Name gt lt sp gt lt Npts gt OUTPut Subsystem OUTPut 1 2 ATTenuation lt sp gt lt 0 to 90 gt FILTer lt sp gt ON OFF STATe lt sp gt ON OFF DRiVe lt sp gt SINGle ended DiFFerential TRACk lt sp gt ON OFF GAT DELay lt sp gt lt 0 00002
27. compatible negative going pulse 120 ns pulse width 400 kHz maximum frequency 3 The Front Panel CLOCK input can also be used to control the DAC internal Track and Hold Output Amplifiers Use a negative going clock pulse 350 to 400 kHz 1 2 us 50 ns wide Refer to the SOURce ROSCillator SOUR AUTO SHON command 4 An External Sampling Rate Clock is recommended when accurate square or staircase waveforms need to be generated See Section 3 3 14 for details Example SOUR ROSC SOUR INT Selects the Internal Sampling Rate Clock SOUR ROSC SOUR EXT Selects the Front Panel CLOCK input SOUR ROSC SOUR TTLT4 Selects TTL Trigger Line 4 Related Commands SOURce ROSCillator SOUR AUTO Reset Condition Sends SOURce ROSCillator SOURce INT 4 26 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SOURce Subsystem SOURce ROSCillator SOURce AUTO DBS 8750 EEE RS EEE PER SOURce ROSCillator SOURce AUTO Description Synchronizes the Track and Hold to either the Front Panel CLOCK input or the Internal Sampling Rate Clock Syntax SOURce ROSCillator SOURce AUTO lt sp gt lt mnemonic gt Query SOUR ROSC SOUR AUTO Mnemonic Parameters SHON Synchronize Track and Hold to Front Panel CLOCK SHOF Synchronize Track and Hold to the Internal Sampling Rate Clock Notes 1 The CLOCK input requires a negative going pulse 1 2us 50ns wide 350 to 400 kHz 2
28. high for the entire output burst MAST unctio ee eies Reset the instrument TRIGI SEQI STARL Start of SEQuence1 for OUT 1 SOUR1 FUNC SIN Select sine wave SOUR1 VOLT 5 75 Select 5 75 volt amplitude SOUR1 FREQ 1000 Select 1 kHz OUTP1 FILT ON STAT ON Select filter OFF output ON TRIG1 SEQ1 COUN 10 Set SEQuence1 Counter to 10 TRIG SOUR EXT Select External Trigger from front panel TRIG1 SEQ1 STOP End of SEGuence1 INTE Luske Initiate trigger sequence NOTE Because of the methods used to calculate waveforms the actual output may not appear exactly as illustrated Figure 3 19 Example 2 Output Wave SEQuence1 10 cycles DAC 1 Waveform Memory 32K Number of Points A burst of 10 cycles is generated when EXT TRIG is held low EXT TRIG 3 27 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 6 3 4 Example 3 Free Running Complex Wave The following sequence continuously generates 1 cycle of a pre defined USER function followed by 5 cycles of a 400 Hz 1 volt square wave on channel 2 Notice that the Free Running Mode is set by the TRIG2 COUNt 0 command MAST EE Reset the instrument TRIG2 SEQI STAR Start of SEQuence1 for OUT 2 SOUR2 FUNC USER
29. of the instrument described herein Publication of this information does not convey any rights to reproduce it or to use it for any purpose other than in connection with the installation operation and maintenance of the equipment described herein P N 82 5106 Revision 2 Copyright Analogic Corporation 1995 All rights reserved Printed in U S A DBS 8701 DBS 8710 and DBS 8750 are trademarks of Analogic Corporation Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Warranty Analogic warrants only to the original purchaser that this product as purchased from Analogic or an Analogic distributor or dealer will conform to the written specifications for a period of one year from the date of purchase If the product fails to conform to these warranties Analogic as its sole and exclusive liability hereunder will repair or replace the product and or its components within a reasonable period of time if the product is returned to a Tektronix service center within the warranty period These warranties are made upon the express condition that a The purchaser promptly notify Tektronix in writing of any non conformity with the above warranty including a detailed explanation of the alleged deficiencies b The productis returned to a Tektronix service center at the buyer s expense after making suitable arrangements for performance of service c When the product is returned for rep
30. select a frequency of 200 kHz This forces the 8750 to create a data pattern consisting of exactly two data points Now if a 20 kHz external clock is applied for example the output waveform is a 10 kHz square wave half the external sampling rate with clock related noise spikes appearing only at the rising edges of the external clock This same technique applies to other DC accurate applications such as for generating staircase Figure 3 10c or pulse waveforms 3 12 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation el Figure 3 10 Square Wave Generation with Internal External Clock aoo wz imema cree LT LT LE LE LLL Output Square Wave ne Output noise splkes synchronous with Sampling Rate Clock a External Sampling Rate Clock LT LT Output Square Wave between clock edges Clock edges corresponding with data edges b External Sampling Rate jade Output Staircase Wave Staircase Waveform Generation c 3 13 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 4 GENERATING ARBITRARY WAVEFORMS Arbitrary waveforms can be generated by either of the two commands SOURce 1 2 FUNCtion USER or SOURce 1 2 FUNCtion MEMory 3 4 1 SOURce FUNCtion USER Waveforms The USER function generates waveforms which have been calculated by the
31. to 41 945 gt SYNC TTLTrg lt sp gt ON OFF SOURce Subsystem SOURce 1 2 FREQuency lt sp gt lt 12 5 to 20000 VOLTage lt sp gt lt 10 to 10 gt OFFSet lt sp gt lt 10 to 410 FUNCtion lt sp gt DC SINe SQUare TRlangle NOISe USER MEMory ROSCillator SOURce lt sp gt INT EXT TTLTrg lt 0 7 gt AUTO SHON SHOF TRIGger Subsystem TRIGger 1 2 SEQuence 1 2 STARt STOP COUNt lt sp gt lt numeric gt COUNt lt sp gt lt numeric gt SOURce lt sp gt EXT INT INITiate 1 2 ABORI 1 2 3 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation Figure 3 2 DBS 8750 Front Panel External Clock Input BNC Accepts a TTL level active low clock maximum frequency of 400kHz and pulse width of 120 ns min External Trigger Input BNC Accepts a TTL active low input signal which allows waveform generation during the low period Gate Enable Output BNC Produces a TTL active low output signal during waveform generation synchronized with the Internal Precision Clock Can be programmed for a delay of 20 us to 41 94 seconds Instrument Reset Pushbutton Resets the DSP switches both outputs off executes the power up self test diagnostic and leaves the instrument in the power up default state Pass Fall Indicator Indicates diagnostic test results Pass Green Fail Red Channel 1 Output TWBNC Chann
32. with the ABORt command Analog output control commands OUTPut commands can be included as part of trigger sequences but are executed only once following INITiate 5 Sending an ABORt does not effect the output settings Example TRIGgerl SEQuencel STARt TRIG2 SEQ1 STAR Related Commands INITiate ABORt SOURce commands Reset Condition Erases all TRIGger SEOuences 4 28 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TRIGger Subsystem DBS 8750 TRIGger SEQuence STOP JE EE EEE EE EEE NOTE In order for Trigger Sequences to run correctly the DBS 8750 must be equipped with firmware revision 2 0 or higher To determine hardware software revision levels refer to the IDN command in Section 4 TRIGger SEOuence STOP Description Defines the end of a Trigger Sequence Syntax TRIGger 1 2 SEQuence 1 2 STOP Query None Notes 1 To program each Trigger Sequence send the following set of commands TRIGGger SEQuence 1 2 STARt e e e sequence definition statements e e TRIGger SEQuence 1 2 STOP 2 The designation 1 2 following the keyword TRIGger is used to select the channel being programmed 3 Two TRIGger sequences are allowed per channel The designation 1 2 following the keyword SEQuence is used to delineate sequence 1 from sequence 2 4 Always start a trigger sequence by sending the command INITiate The sequ
33. 1 2 TECHNICAL SUPPORT rrersovenvevvrsavvsvrnernessvrsvennesssnenssennsennnenvesnnsenee 1 3 2 Preparation amp Installation 2 1 OVERVIEW skirenn vk gate ansees 2 1 2 2 HARDWARE JUMPERS ervrvonvenornvrennerernsrnrevsnrnvnrnreressnrnrneneesernnrsevenes 2 1 2 2 1 Selecting the Base Address n6neennenaae ens 2 3 2 2 2 Selecting the Address Space sss 2 3 2 2 3 Selecting TTL Trigger Lines esee 2 4 2 2 4 Deglitching Filter Selection sees 2 5 2 3 INSTALLATION errare ratore eine eerte e HR Een ES ER eed rasedate 2 5 2 3 1 Input Output Connections eene 2 5 2 3 2 Analog Outputs eene reso itte eret eoe a een n inni 2 5 2 4 START UP AND VERIFICATION esses eee eene 2 6 2 4 1 Power Up Status esee enean enne 2 6 2 4 2 Initial Gheckout oet tenete kka dna e 2 7 3 Operation 9 1 OVERVIEW usann tada TS 3 1 3 2 CONTROLS AND INDICATORS e erre 3 1 3 3 GENERATING STANDARD WAVEFORMS 3 3 3 3 1 Selecting the Waveshape nirorevetoeraaneerer 3 4 3 3 2 Selecting the Freguency neenennseveneenanenenenansnennes 3 4 3 3 3 Selecting the Amplitude 3 4 3 3 4 Selecting the DC Offset 3 4 3 3 5 Selecting the Drive Mode eos 3 5 3 3 6 Selecting Attenuation
34. 5 volt sine wave on OUT 2 System reset Ready for operation Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual O a EE E R a 2 8 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Section 3 Operation 3 1 OVERVIEW This section describes how to operate the DBS 8750 using the DBS 8750 Command Set Figure 3 1 This command set is used to control the generation of standard and arbitrary waveforms data transfers to and from memory triggering clock selection and diagnostic tests See Section 4 the DBS 8750 Command Reference for more information NOTES When programming this instrument it is necessary to read the Data Low Register after sending every command except Reset RST The normal response is the new line character x0A or a status message The DAC Waveform Memorles are not accessible from the VXibus The shared DSP User Memory has 17150 words of user acccessible read write space for data transfers to from VXI memory or from the LOCALbus via connector P2 If this instrument is to be controlled using a software driver refer to the Software User s Manual received with the driver for software installation and operating instructions Error messages are generated for operational errors that are related to command entry execution triggering data entry or memory usage See Appendix C for
35. 750 The 8750 assumes that the whole allocated buffer area is used for the wave form Thus if the buffer is used to generate an output before it has been completely initialized the waveform may have unpredictable values 7 There is no bounds checking while writing the user buffer Writing to unallocated memory or writing more points than have been allocated may cause unpredictable results including hanging the VME bus Example A DBS 8750 using offset 0x480000 allocates 1000 wave points beginning at VXI A24 address 0x4D6A50 MEM MALL NEW_WAVEFORM 1000 Response 0x00056A50 OUTPut Subsystem OUTPut ATTenuation DBS 8750 OUTPut FiLTer p OUTPut ATTenuation Description Sets output signal attenuation Syntax OUTPut 1 2 ATTenuation lt sp gt lt numeric gt Query OUTP ATT Numeric Parameters 0 to 90 Note Output attenuation is accomplished by a combination of a switched resistor network and voltage reduction performed by mathematical calculation The resistor network provides attenuation steps of 0dB 10dB 20dB and 30dB Other settings are completed by mathematical calculations which lower the output voltage an additional amount Example To set 20dB attenuation on channel 2 OUTP2 ATT 20 Related Commands None Reset Condition Zero 0 attenuation for both channels OUTPut FILTer Description Connects or disconnects the output filter for channel 1 or 2 Syntax OUTPut 1 2 FILTer lt sp gt lt boolean gt Quer
36. ALCulate Subsystem CALCulate MATH Segment 1 Segment 2 Segment 3 Segment 16 DIAGnostic Subsystem DIAGnostic MEMory Subsystem WRITe lt sp gt lt VXI Addr sp Npts sp Buffer Name READ sp VXI Addr sp Npts sp Buffer Name SAV1 2 sp Buffer Name ACQuire sp Npts sp Buffer Name CATalog ALL BINary DELete lt sp gt lt Buffer Name gt ALL FREELALL BINary MALLocate lt sp gt lt Buffer Name gt lt sp gt lt Npts gt OUTPut Subsystem OUTPut 1 2 ATTenuation lt sp gt lt 0 to 90 FlILTer sp ON OFF STATe lt sp gt ON OFF DRiVe lt sp gt SINGie ended DIFFerential TRACk lt sp gt ON OFF GAT DELay lt sp gt lt 0 00002 to 41 945 gt SYNC TILTrg lt sp gt ON OFF SOURce Subsystem SOURce 1 2 FREQuency lt sp gt lt 12 5 to 20000 gt VOLTage lt sp gt lt 10 to 10 gt OFFSet sp 10 to 10 gt FUNGHion lt sp gt DC SINe SQUare TRiangie NOISe USER MEMory ROSCillator SOURce lt sp gt INT EXT TTLTrg lt 0 7 gt AUTO SHON SHOF TRIGger Subsystem TRIGger 11 2 SEQuence 1 2 STARt STOP COUNt lt sp gt lt numeric gt COUNt lt sp gt lt numeric gt SOURce lt sp gt EXT INT INITiate 1 2 ABORt 1 2 4 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 Command Reference CA SS EE ST a E E Figure 4 2 Concatenating Commands Se
37. CALCulate 1 2 MATH command USER defined waveforms may consist of up to 16 user defined segments but the total waveform length must be no more than 32K words Refer to Section 3 5 on memory and waveform size The format of the CALCulate 1 2 MATH command is as follows CALCulate 1 2 MATH lt sp gt lt segment 1 gt lt sp gt lt sp gt lt segment 16 gt where lt segment n gt FOR lt sp gt lt duration gt lt sp gt lt voltage gt a mathematical expression of the waveform segment where FOR Is a directive which begins the mathematical definition duration Specifies the period of time in seconds during which the voltage function takes place Do not use commas or suffixes such as m milli u micro k kilo or M Mega these are not recognized by the firmware voltage Specifies the output voltage with respect to time It can be expressed as a simple decimal value or a complex mathematical expression using any of the mnemonics and symbols described in Table 3 1 In general when writing math expressions use parentheses to group quantities properly and note that expressions are always evaluated from right to left Do not exceed 16 FOR statements or 859 characters per command Table 3 1 Mathematical Mnemonics and Symbols Mnemonic Function or Mnemonic Function or or Symbol Meaning or Symbol Meaning Positive value addition Cosine Negative value subtrac
38. ED is red while the tests run and switches to green if all 3 tests pass Syntax DIAGnostic REGS Note Running DIAGnostic REGS disconnects the outputs and destroys any programmed waveform on both channels Example DIAG REGS Reset Condition This diagnostic is included in the self test diagnostics which are invoked by a reset command DIAGnostic ALL Description The DIAGnostic ALL command performs the following in order EPROM Checksum Test DAC Register Test Offset Register Test VXI Control Register Test SRAM Status Register verification DAC RAM Test and Analog output Test The front panel LED is red while the tests run and switches to green if all tests pass Syntax DIAGnostic ALL Notes 1 Running DIAGnostic ALL disconnects the outputs and destroys any programmed waveform on both channels 2 The diagnostic halts upon detecting an error after which no further testing is performed Thus an EPROM checksum error prevents the register memory and analog tests from running Example DIAG ALL Reset Condition This command invokes the same self test diagnostic routine which is invoked by a reset command 4 10 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DIAGnostic Subsystem DIAGnostic DBS 8750 Command Reference DIAGnostic Description Generates an ASCII error message Syntax DIAGnostic Response One of the following messages may be returned
39. Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com MEMory Subsystem MEMory SAV DBS 8750 Command Reference jutita nar EEE 4 The DBS 8750 must allocate contiguous blocks of memory If you have been creating and deleting buffers a MEM READ may fail even though the total amount of free memory is sufficient Example To read 1024 words from VXI memory starting at address 200000h and store them in buffer VDATA MEM READ 200000 1024 VDATA Related Commands Other MEMory commands SOUR FUNC MEM Reset Condition All buffers in SRAM are deleted MEMory SAV Description Transfers the waveform data that currently resides in DACWaveform Memory to a specified buffer in DSP User Memory Syntax MEMory SAV1 2 lt sp gt lt Buffer Name gt Notes 1 If the specified buffer does not exist a new one is created If the buffer already exists the previous waveform data is lost If enough memory cannot be allocated for the user buffer an error message is generated and the buffer is not created 2 If the buffer exists and a subsequent read requires a larger buffer the program attempts to re size the buffer If this fails an error message is generated and enough memory is re allocated for the original buffer However the data in the original buffer may be corrupted All DBS 8750 buffers are BINary Up to 20 user buffers may be created The DBS 8750 must allocate contiguous blocks of memory If you ha
40. LL 3 6 TRIGGERING The DBS 8750 can be triggered internally by the software or externally via the front panel TRIG input or one of the TTL Trigger lines Use the following command for trigger control TRIGger SOURce INT EXT TTLtrg lt 0 7 gt INT ae Internal Software Command EXT iis Front Panel TRIG Input TELtrg lt 0 7 gt TTL Trigger line 0 7 3 6 1 Internal Trigger To select internal triggering send TRIGger SOURce INT Since this is the power on default setting in a sense the DBS 8750 is always triggerred With the internal trigger mode waveform generation begins immediately after it is defined assuming that the output is switched on To use this command effectively 1 Send TRIG SOUR EXT 2 Define the waveform 3 Send TRIG SOUR INT to start the waveform 3 6 2 External Trigger The TRIG input via the front panel connector or a TTLTRG line accepts a TTL active low signal to enable waveform generation An uncertainty of 60ns to 120ns may be introduced due to internal synchronization By sending TRIGger SOURce EXT the TRIG input signal can be used to control waveform generation 3 23 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 6 3 Trigger Sequences A Trigger Sequence is a set of command functions which are executed under control of the Internal External Trigger signal and the Trigger Sequence Commands Table
41. NG FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at www instraview com information on price quotations drivers technical LEASING MONTHLY specifications manuals and documentation RENTALS ITAR CERTIFIED RR aed Contact us 888 88 SOURCE sales artisantg com www artisantg com
42. Operation 3 3 8 Using Track and Hold 3 3 8 1 Tracking Mode The Tracking Mode is selected by using the following command OUTput 1K2 TRACk ON or 1 OFF or 0 ON ori Track Only OFF or 0 Track and Hold Figure 3 5 shows the affects of the Tracking Modes on the Digital to Analog DAC output signal When generating sine waves always switch to the Track and Hold Mode which reduces the code dependent glitch energy on the DAC output For DC levels switch to the Track Only Mode to prevent Track Hold switching noise on the DAC output The Track Only Mode is also useful for reducing square wave settling times However glitch energy at major DAC code transitions will be higher Figure 3 5 Output vs Tracking Mode Track amp Hold Mode OUTPut TRACK OFF Track Hold Track Hold Switching Noise i DAC Output Track Only Mode OUTPut TRACk ON input jn 3 Track always true Track Hold DAC Output l Changing Code V DAC Output Unchanging Cod OV Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 3 8 2 Track and Hoid Synchronization The Track and Hold Mode can be synchronized with either the 400 kHz Internal Sampling Rate Clock or an External Sampling Rate Clock via the front panel CLOCK input Figure 3 6 To synchronize the Track and Hold use the following command SOURce ROSCillat
43. POR ER e ck Kd Let a T 4 33 ABORT veska LU 4 33 System Commands Queries VXI sytem level commands OLS kansleren 4 34 REGE SE 4 34 ESR gasser AVAMA SK 4 34 MIDI 4 34 SOPO EEA EEE TE 4 35 RAS Te bee 4 35 AGRE m 4 35 ESTO OE A 4 35 ST ST d 4 36 nii B 4 36 4 5 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com CALCulate MATH CALCulate Subsystem DBS 8750 CALCulate MATH Description Calculates a USER output function USER functions are selected using the SOURce FUNC USER command Syntax CALCulate 1 2 MATH lt sp gt FOR lt sp gt lt duration gt lt sp gt lt voltage gt lt sp gt FOR lt sp gt lt duration gt lt sp gt lt voltage gt lt sp gt FOR lt sp gt lt duration gt lt sp gt lt voltage gt 16 FOR statements maximum FOR A directive which begins the mathematical definition of a segment duration The time period seconds during which the voltage function takes place voltage Output voltage with respect to time Expressed as a simple decimal value or a complex mathematical expres sion using the mnemonics and symbols in Table 4 1 Notes 1 When specifying duration and voltage DO NOT use commas or suffixes such as m milli 4 micro k kilo
44. Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Figure 3 4 Output Voltage Characteristics Open Circuit Output Output with 50 ohm Load Example Set Up Function Sine Wave Amplitude 2 V peak Offset 1 V Impedance 50 3 3 6 Selecting Attenuation The output signal can be attenuated from 0 to 90dB by sending OUTPut 1 2 ATTenuation n where n O to 90 Output attenuation is accomplished by a combination of a switched resistor network and voltage reduction performed by mathematical calculation The resistor network provides attenuation steps of OdB 10dB 20dB and 30dB Other settings are completed by mathematical calculations which lower the output voltage an additional amount 3 3 7 Selecting the Filter An output reconstruction filter is available for low distortion sine wave generation The filter is connected in line or bypassed by sending the following command OUTPut 1 2 FILTer ON or 1 OFF or O ON or 1 to connect the filter OFF or 0 to bypass the filter Normally the filter should be switched ON However the instrument may be used with the filter switched OFF for certain step functions Always Switch the filter ON to generate low distortion SINe waves See also Section 3 3 8 for use of Track and Hold with SINe waves Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com
45. S 8750 User s Manual 3 5 3 Read Write VXI Memory NOTE The MEMory READ and MEMory ACQuire functions automati cally allocate the named buffer if it does not already exist The DBS 8750 can read write VXI Memory data using the MEMory READ and MEMory WRITe commands Refer to Figure 3 14 A READ transfers data from VXI memory to DSP User memory A WRITe transfers data from the DSP User Memory to VXI Memory For example to read 1024 points of VXI memory data starting at VXI address 200000h into a DSP User Memory buffer named VDATA send MEMory READ 200000 1024 VDATA To WRITe 1024 points of DSP User memory buffer VDATA into VXI Memory starting at VXI address 200000h send MEMory WRITe 200000 1024 VDATA The DBS 8750 is a Bus Master during data transfers 3 5 4 Acquiring LOCALbus Data Waveform data can be acquired via the LOCALbus from an external source such as a DBS 8700 Digitizer The strobe signals and timing requirements are shown in Figure 3 17 The 16 bit word is received in two bytes using two individual strobe signals LDHI P2c17 is the high byte strobe signal loaded first and LDLO P2c18 is the low byte strobe signal To acquire 2048 points of waveform data via the LOCALbus and store it in a buffer named DIGDATA send MEMory ACQuire 2048 DIGDATA Figure 3 17 LOCALbus Timing Diagram Lo Byte X Hi Byte X Lo Byte I 30ns min at lt 30ns min 9 Mz 3 20 Artisan T
46. SIN OUTP2 FILT ON Related Commands All OUTPut commands Reset Condition Sets DC function to 0 Volts for both channels SOURce FUNCtion SQUare Description Selects the Square Wave output function Syntax SOURce 1 2 FUNCtion lt sp gt SQUare Query SOUR FUNC Notes 1 When using the Internal Sampling Rate Clock a 5 mV 1 5 us spike appears on the unfiltered output every 2 5 usec This limits the amplitude accuracy of the generated square wave For better performance use an External Sampling Rate Clock 2 Wave generation begins only after frequency amplitude and function are defined 3 Voltage range 10 Volts Example To generate a 9 99 kHz 4 777 volt square wave on channel 2 SOUR2 VOLT 4 777 SOUR2 FREO 9990 SOUR2 FUNC SQU Related Commands OUTPut commands Reset Condition Sets DC function of both channels to 0 Volts 4 23 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SOURce FUNCtion TRiangle SOURce Subsystem SOURce FUNCtion NOISe DBS 8750 Command Reference SOURce FUNCtion TRIangle Description Selects the Triangle output function Syntax SOURce 1 2 FUNCtion lt sp gt TRlangle Query SOUR FUNC Notes 1 Wave generation begins only after frequency amplitude and function are defined 3 Voltage range 10 Volts Example To generate a 9 99 kHz 4 777 volt triangle wave on channel 2 SOUR2 VOLT 4 777 SOUR2 FREQ 9990 SOUR2 FUNC TRI Rel
47. The output coupling and impedance switches are located on the front panel As you can see the output drive can be configured for a single ended or differential output drive depending upon the state of the relay switches To program the output drive send the following command OUTPut 1 2 DRIVe SINGle ended DIFFerential SINGle ended Single ended output drive DIFFerential Differential output drive NOTE The Single Ended output drive has a range of 20 10 volts The Differential output drive has a range of 10 5 volts Maximum output current should not exceed 40 mA As shown in Figure 3 4 the actual programmed peak voltage amplitude and voltage offset value are produced at the output connector under open circuit conditions only When a load is connected the programmed voltage values are reduced The amount of reduction depends upon the output impedance of the DBS 8750 and the input impedance of the load As you can see applying a load to the output creates a voltage divider with the series output resistance 50 or 600 ohms of the instrument The actual voltage level measured at the output depends upon the ratio of the input and output impedances Figure 3 3 Simplified Output Stage Schematic Output Signal from Front Panel Switches Attenuator Circuits Coupling Impedance Output Relay A OUT 1 2 Output State Relay A Relay B Output OFF Off Output ON SE On Output ON DIFF On 3 5 Artisan Technology Group
48. UR INT Description Selects the internal trigger mode Syntax TRIGger 1N2 SOURce lt sp gt INT Query TRIG SOUR Note The Internal Trigger mode initiates trigger sequence operation using the Internal Precision Clock Example To set the internal trigger mode TRIG SOUR INT Related Commands None Reset Condition Sets trigger mode to internal 4 32 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TRIGger Subsystem INITiate DBS 8750 ABORt Se Sr ETER EEE INITiate Description Arms a trigger sequence Syntax INITiate 1 2 Notes INITiate does not affect any other DBS 8750 setting 1 2 The designation 1 2 following the keyword INITiate is used to select the channel being programmed 3 IE ABORt stops the TRIGger sequence the next INITiate uses analog output control conditions set by the most recent OUTPut commands 4 Once INITiate activates the TRIGger SEOuence subseguent commands are not accepted except ABORt and RST until a terminating condition occurs ABORT received or TRIG COUNt expires Example Initiating a trigger sequence INIT Related Commands TRIGger SEQuence ABORt Reset Condition Erases all pre programmed TRIGger SEQuences ABORt Description ABORt stops execution of the trigger sequence saves trigger sequence information and returns to generating the waveform which was set before the sequence started To restart sequence send
49. air a copy of the original bill of sale or invoice is sent with the product d Analogic will not be liable for any incidental or consequential damages e In the opinion of Analogic upon inspection the product has not been misused altered or damaged due to abnormal handling and or operation f Repairs to the product and or its components have not been made by anyone other than Analogic or one of its authorized repair agents g The product has not been modified altered or changed in any manner by anyone other than Analogic or one of its authorized repair agents THIS WARRANTY EXCLUDES ALL OTHER WARRANTIES WHETHER EXPRESSED OR IMPLIED ORAL OR WRITTEN INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY AND OR FITNESS FOR A PARTICULAR PURPOSE No term condition understanding or agreement purporting to modify the terms of this warranty shall have any legal effect unless made in writing and signed by an authorized officer of Analogic and the purchaser Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Contents 1 Introduction 1 1 PRODUCT DESCRIPTION DR 1 1 1 1 1 Functional Overview rrorenrervnrnevnrarvrnnrvnnsnnrarnrnenrnerernanesnresene 1 1 1 1 2 AceessolieS 54 1scesivotssiv vnes v nsaekute lese il ide k s eeni naval ve genes 1 3
50. alue For example OUTPut 1 2 STATe ON OFF 4 2 5 Output Channel Selection The 1 2 designation following the first keyword of a command is used to select the output channel For example OUTPut2 STATe ON switches channel 2 ON whereas OUTPut1 FILTer ON or OUTPut FILTer ON switches the channel 1 output filter ON 4 2 6 Query Commands Unless noted otherwise parameter settings are queried by adding a question mark to the command which set the parameter For example sending SOURce1 VOLTage 10 sets the amplitude of channel 1 to 10 volts Sending the command SOURce1 VOLTage reads back the current value 43 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 4 4 COMMAND INDEX CALCulate Subsystem The USER function calculation command CAL Culate MATH e 4 6 DIAGnostic Subsystem Diagnostic test commands DIAGnostc EPROm 1 4 10544155 esses conse ceslacessavcteezveetageisivasteicesscbeaeeeasieonecsss ERU 4 8 DIAGnosticiSRAM M 4 8 DIAGnostic ANALOg 2 coeant tis baa e a een RE Ra Rua a MENS Enn e XN E SEN a banken i 4 9 DIAGnostic DRAM serve aceite eere ci ri poet e v Y P WES Y VN XE aaa eo s RR GERM state 4 9 DIAGnostic REGS iieri endosi nibki stissi VEG VER andvad EX EY Lie veria 4 10 EN ET ga MR NR aia 4 10 s iencoy 4 11 MEMory Subsystem Memory mana
51. ated Commands OUTPut commands Reset Condition Sets DC function of both channels to 0 Volts SOURce FUNCtion NOISe Description Selects the Noise output function Syntax SOURce 1 2 FUNCtion lt sp gt NOISe Query SOUR FUNC Notes Maximum noise amplitude 10 Volts Example To generate 5 00 volt noise for channel 2 SOUR2 FUNC NOIS SOUR2 VOLT 5 0 Related Commands OUTPut commands Reset Condition Sets DC function of both channels to 0 Volts 4 24 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SOURce Subsystem SOURce FUNCtion USER DBS 8750 SOURce FUNCtion MEMory SOURce FUNCtion USER Description Selects the USER output function The USER output function is defined by the CALC MATH command If the mathematical expres sion was already defined and entered using the CALC MATH com mand the actual calculation is executed only after entering the SOURce FUNCtion USER command Syntax SOURcef1 2 FUNCtion lt sp gt USER Query SOUR FUNC Example To generate a 1 kHz 2 volt sine wave on channel 1 CALC MATH FOR 0 001 2 SIN 2 PI t 1000 SOUR FUNC USER SOUR OUTP FILT ON SOUR OUTP STAT ON Related Commands OUTPut commands CALC MATH lt expression gt Reset Condition Erases FUNCtion lt sp gt USER and CALC MATH information SOURce FUNCtion MEMory Description Selects the MEMory output function The MEMory output function is determined by the selected me
52. buffer named SavdWave The user then transferred that buffer 3 to the VXI Memory Next 1024 data points were read 4 from the VXI Memory and stored in the buffer named VxBuffer After that the user acquired 2048 data points 5 from a DAS module via the LOCALbus and generated that waveform in the DAC 2 channel 6 Finally a 2048 word space was allocated 7 in the memory for NewData Saving Waveforms To save a particular waveform first select it by the command SOURce FUNCtion DC SINe SQUare TRlangle NOISe USER MEMory This creates the waveform data in the DAC 1 2 Waveform Memory The waveform data can then be saved using the command MEMory SAV1 2 lt Buffer Name gt Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation Figure 3 16 DSP User Memory Example DBS 8750 aa ieee ONE ere DSP Control DAC 2 Memory 64K words DAC 1 Memory 64K words Standard Waveform Library D SOURce1 FUNCtion SINe VOLTage 5 FREQuency 400 MEMory SAV1 Savd Wave MEMory WRITe lt VXI Address gt 1000 SavdWave MEMory READ lt VXI Address 1024 VxBuffer MEMory ACQuire 2048 DASdata 6 SOURce2 FUNCtion MEMory DASdata MEMory MALLocate NewData 2048 OUT 1 400 kHz 5 volt Sine Wave OUT2 pasdata Output Stage N 3 19 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DB
53. ccepts a TTL active low clock 120 ns minimum pulse width 400 kHz maximum frequency For generating Sine waves the CLOCK input should be a 350 to 400 kHz negative going pulse with a pulse width of 1 2us 50ns For low distortion the clock signal should have less than 100 ps of jitter If jitter exceeds 100 pS the output DAC noise and distortion are degraded The CLOCK input can be used to control Track and Hold See Section 3 3 8 3 TTLTrg lt 0 7 gt External Sampling Rate Clock from TTLTRG 0 7 NOTE To generate low distortion sine waves set the Front Panel CLOCK input frequency to 350 to 400 kHz For other func tlons there are no External Clock frequency limits Do not use an External Sampling Rate Clock for setting up the output functions Perform all output setup using the Internal Sampling Rate Clock and then switch to the External Sampling Rate Clock for the final operation Figure 3 21 Front Panel CLOCK Input Circult External Clock In 3 29 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 8 DIAGNOSTIC TESTS The DiAGnostic Subsystem contains commands that perform specific diagnostic tests on the DBS 8750 For all diagnostic tests the front panel PASS FAIL LED is red while the test is running and switches to green when the test passes Use the query command DIAG to obtain the status follow ing any test DIAGnostic EPRo
54. cy amplitude and offset voltage SOURce FREQuUency eee nennen nennen tenete netn ttn eene 4 21 SOURce VOLTage sese nennt nne nennen nennen enne nn tntn nena 4 21 SOURce VOLTage OFFSet sseesseseeeseeee eene eene nnne 4 22 SOURce FUNCtion DC sees neret tnter nennen retener 4 22 SOURce FUNCtion SING eseeseeeeeee nee nnnm enne tenens inen 4 23 SOURce FUNCtion SQUAare eeeeeeseeesesee eee ttn enne nennen nennen 4 23 SOURce FUNCtion TRlangle eese nennen 4 24 SOURce FUNCtion NOISE eese nenne nennt nnne nennen 4 24 SOURce FUNCtion USER sesenta nne nnt nnae nennen tanen 4 25 SOURce FUNCtion MEMory i renreasnernrsererevevversresersennasnvesnavereeersenrasveesrassnnsarer 4 25 SOURce ROSCIllator SOURCE esses nennen ee rnenn eee nnne 4 26 SOURce ROSCillator SOURce AUTO esee ener 4 27 TRIGger Subsystem Contains used for controlling trigger sequences TRIGger SEQuence STAR eese 4 28 TRiGger SEQuence STOP mnmnnsensvrsreresereserrerssrenersvenseresennerenerevseresssnnsesensererne 4 29 TRiGger SEQuence COUNT essen eese nennt enne enne 4 30 TRIGger GOUN MMEMMEMMEMEMEIMMM 4 31 TRIGger SOURce EXT essent nnene nnne eene en ener 4 32 TRIGger SOURce INT esssseseeee nennen tnnt tnmen eren enn enenen 4 32 INITIAtO ss ea in OUO DO E
55. e writing to a user buffer Writing to memory which has not been allocated or writing more points than have been allo cated may cause unpredictable results including hanging the VXI bus 3 5 6 Memory Status A status of the DSP User Memory can be obtained using the MEMory CATalog and MEMory FREE query commands The MEMory CATalog command responds with a continuous data string in the following format filled memory gt lt free memory buffer name gt lt type gt lt size gt buffer name type size buffer name type size etc If there are no existing buffers the response to MEM CAT is 0 17150 Conversely the MEM FREE response is free memory gt lt filled memory or 17150 0 If the memory is filled as shown in Figure 3 14 MEM CAT responds with the following which is formatted in a column for the purpose of this presen tation Formatting is left up to the user 6260 10890 SAVDWAVE BIN 1000 VXBUFFER BIN 1024 DASDATA BIN 2048 NEWDATA BIN 2048 And the MEM FREE response is 10890 6260 3 22 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation ci a S nn 3 5 7 Deleting Buffers Buffers can be deleted from DSP User Memory all at once or one at a time by name using the MEMory DELete command To delete the first buffer in the Figure 3 14 example send MEM DEL SavdWave To delete all buffers send MEM DEL A
56. e for this buffer In response to this command the DBS 8750 returns either the A24 base address offset in ASCID of the buffer or the error message 225 Out of memory cannot allocate memory for buffer When specifying buffer size keep in mind that the buffer must be loaded into contiguous memory Thus if you have been adding and deleting buffers this command may fail even if the total amount of free memory is sufficient Data may be written to the allocated memory in the A24 D16 space but since only 16 bit transfers are allowed only even addresses are valid This command can also be used to re allocate an existing buffer However if a sufficient amount of contiguous memory space is not available the command may fail Note that the DBS 8750 frees the existing buffer memory before attempting to reallocate the buffer If resizing fails the 3 21 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual ALERT CS ft Som a E LLL buffer re allocates memory to the original size and data in the existing buffer may be corrupted If failure occurs the error message 225 Out of memory cannot resize the buffer is generated NOTE Buffers which are allocated by this command are not initialized by the DBS 8750 The DBS 8750 assumes that the whole allocated buffer area is used for the waveform The DBS 8750 does not provide any bounds checking whil
57. e instrument status byte The status byte has no operational meaning to the DBS 8750 Syntax STB Related Commands None Reset Condition The status byte is 0 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TST System Commands WAI DBS 8750 Command Reference TST Description Self Test executes all diagnostic tests except the SRAM diagnostic and returns a single ASCII character indicating self test results Returned Characters and their meaning No Diagnostic Errors SRAM self test failed DAC RAM bank 6 self test failed DAC RAM bank 1 self test failed DAC control register self test failed DAC rate register self test failed DAC 1 address register self test failed DAC 2 address register self test failed VXI offset register self test failed VXI control register self test failed colon EPROM checksum self test failed semi colon DAC output self test failed Syntax TST Related Commands None WAI Description The WAI command has no operational effect on the DBS 8750 Syntax WAI Related Commands OPC OPC 4 36 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix A Specifications Unless otherwise noted all specifications apply to an instrument configured with the factory jumper selections at 25 C Analog Outputs Number
58. e plus offset cannot exceed 10 Volts Example To set the channel 2 output offset to 1 234 Volts SOUR2 VOLT OFFS 1 234 Related Commands All OUTPut commands Reset Condition Offset is 0 Volts for both channels SOURce FUNCtion DC Description Selects the DC volts output function Syntax SOURce 1 2 FUNCtion lt sp gt DC Query SOUR FUNC Notes 1 The voltage range for a DC waveform is 10 volts single ended or 5 volts differential 2 To generate a clean DC volt level switch the Tracking Mode to Track Only OUTPut 1 2 TRACk ON and switch the output filter ON OUTPut 1 2 FILTer ON Example To set the DC function for channel 2 SOUR2 FUNC DC OUTP2 FILT ON Related Commands All OUTPut commands Reset Condition Sets DC function to 0 Volts for both channels 4 22 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SOURce Subsystem SOURce FUNCtion SINe DBS 8750 SOURce FUNCtion SQUare EEE ST E TE TE LE LTT adl SOURce FUNCtion SINe Description Selects the Sine Wave output function Syntax SOURce 1 2 FUNCtion lt sp gt SINe Query SOUR FUNC Notes 1 Sine wave generation begins only after frequency amplitude and function are defined 2 For low distortion sine wave generation the output filter must be ON Voltage range 10 Volts Example To set a 9 99 KHz 4 777 volt sine wave for channel 2 SOUR2 VOLT 4 777 SOUR2 FREO 9990 SOUR2 FUNC
59. echnology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation TT NOTE This command requires that a complete data transfer occurs in order to terminate successfully Otherwise the command will hang walting for the transfer to complete The data is stored in the specified memory buffer as 16 bit words The maximum word rate is 300 kHz As long as the timing requirements are met this port can receive data from any custom device without burdening the VXIbus See Appendix A for signal connection pin assignments 3 5 5 Allocating Memory The MEMory MALLocate command can be used to allocate a block of DSP User memory This command creates a buffer of a specified point size After allocation any waveform data may be written into this space To allocate a block of DSP User Memory send MEMory MALLocate lt sp gt lt Buffer Name gt lt sp gt lt Npts gt lt Buffer Name gt Name of buffer 31 characters max excluding whitespace colons and semicolons Npts Number of points A positive decimal integer for the number of 16 bit words to be written to memory maximum is amount of free memory minus 35 words overhead No default value Failure to specify causes a syntax error For example sending MEMory MALLocate New Wave 1000 would create a buffer named New Wave starting at the next free location in DSP User Memory and allocate 1000 35 points of memory spac
60. eform esee 3 16 3 15 Rectification Using Absolute Function eee 3 16 3 16 DSP User Memory Example cene eene 3 19 3 17 LOCALbus Timing Diagram nnoeeennsneenonsennnnevoonnnnaneee 3 20 3 18 Example 41 Output Wave n ersrnrnnrvnsvrnravernrrvvanernnvesvervnvnnsnnrevnrernr 3 26 3 19 Example 2 Output Wave eene eee 3 27 3 20 Example 43 Output Wave eversenaransnasnannnanananennaaneen enn sne nennst 3 28 3 21 Front Panel CLOCK Input Circuit eene 3 29 4 1 DBS 8750 Command Tree eese 4 3 4 2 Comcatenating Commands eese 4 3 B 1 Connector Pi sasessseeisasconssuscantos ienes pa rin red In ER o EHE I REP A T Postas viisas B 2 B 2 Connector P2 rrt Preterea eir Een B 2 vill Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Section 1 Introduction 1 1 PRODUCT DESCRIPTION The DBS 8750 is a 400 kHz 16 bit precision VXI Message Based Arbi trary Waveform Synthesizer Using its command set the DBS 8750 can generate highly accurate standard and arbitrary waveforms on either of its two differential or single ended output channels Combining the superior performance of a dual digital to analog converter DAC with the speed and processing capability of a digital signal processor DSP the DBS 8750 provides precision analog output s
61. eform generation synchronized with the Internal Sampling Rate Clock 2 3 2 Analog Outputs The analog outputs OUT 1 and OUT 2 Figure 2 2 are provided on TWBNC connectors The outputs are switch selectable for 50 or 600 ohms output impedance and AC DC coupling The output stage is software selectable for a single ended or differential configuration CAUTION The output driver current should not exceed 40 mA max For hardware revision 1 and up only 2 5 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Figure 2 3 Output Channel Connectors 1 amp 2 O Signal Signal Signal Ground Isolated utput Impedance Selection Switch AC DC Coupling Selection Switch 2 4 START UP AND VERIFICATION 2 4 1 Power Up Status At power on a self test is executed The Pass Fail indicator is red during the test 4 8 seconds and switches to green when the test passes see TST command in Section 4 Both output channels assume the default param eters listed in Table 2 6 following the self test Table 2 6 OUT 1 amp 2 Default Power On State Output Filters Attenuation Output Drive On Off State Waveshape Frequency Voltage Offset Voltage Memory Buffers Oscillator Source Trigger Source Trigger Sequence Count Trigger Loop Count 2 6 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www a
62. el 1 analog output Pin is 4 Socket is Programmable differential or single ended output drive OUT 1 impedance Switch Sets channel 1 output impedance to 50 or 600 ohms OUT 1 Coupling Switch Sets channel 1 output coupling to AC or DC Channel 2 Output TWBNC Channel 2 analog output Pin is Socket is Programmable differential or single ended output drive OUT 2 Impedance Switch Sets channel 2 output impedance to 50 or 600 ohms OUT 2 Coupling Switch Sets channel 2 output coupling to AC or DC 3 3 GENERATING STANDARD WAVEFORMS The commands used to generate standard waveforms are found in the SOURce and OUTput subsystems of the DBS 8750 Command Tree Although the commands that determine waveform characteristics may be written in any order it is recommended that all characteristics be setup before changing the state of the output to ON 33 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual NOTE The filter should be ON when generating waveforms If it is OFF and the internal clock is used to generate square or triangle waves the acurracy is limited due to spikes intro duced from the Track and Hold control circuit Section 3 3 8 3 3 1 Selecting the Waveshape Standard waveshapes are set up by sending the following command SOURce 1 2 FUNCtion DC SINe SQUare TRlangle NOISe DG aicut DC output level SING
63. ence can be stopped anytime with the ABORt command Example TRIGger2 SEQuence1 STOP TRIG1 SEQ2 STOP Related Commands INITiate ABORt Reset Condition Erases all TRIGger SEQuences 4 29 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TRIGger SEQuence COUNt TRIGger Subsystem DBS 8750 Command Reference NOTE in order for Trigger Sequences to run correctly the DBS 8750 must be equipped with firmware revision 2 0 or higher To determine hardware software revision levels refer to the IDN command in Section 4 TRIGger SEQuence COUNt Description Specifies how many times to repeat the conditions of the specified Trigger Sequence This specifies the number of waveform cycles that are to be written in Waveform Memory Syntax TRIGger 1 2 SEQuence 1 2 COUNt sp numeric Numeric Parameter numeric Number of times to repeat the trigger sequence s Notes 1 The COUN must be a decimal integer 2 The designation 1 2 following the keyword TRIGger is used to select the channel being programmed 3 Always start a trigger sequence by sending the command INITiate It can be stopped with the ABORt command if TRIG COUN 0 4 This command must be sent between the STARt and STOP commands The total number of points generated by the trigger sequence s must be less than or equal to 32K words the maximum number of points t
64. eration SRAM is not tested during this routine NOTE This test disconnects the outputs and destroys any pro grammed waveforms on either channel 3 8 5 Register Test Sending DIAGnostic REGS initiates a routine that verifies proper operation of the DAC Control Offset and VXI Control registers NOTE This test disconnects the outputs and destroys any pro grammed waveforms on either channel 3 8 6 Running All Diagnostic Tests Sending DIAGnostic ALL performs all diagnostic tests in the following order EPROM Checksum Test DAC Register Test Offset Register Test VXI Control Register Test SRAM Test DAC Wavfom Memory Test DAC Output Test See also the TST command in Section 4 3 31 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 32 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Section 4 DBS 8750 Command Reference 4 1 INTRODUCTION This section describes the DBS 8750 Command Set A command index is provided on pages 4 4 and 4 5 The command descriptions are grouped by subsystems and each command and the subsystem to which it belongs is referenced in the header of each page The commands are defined in terms of function syntax parameter selections and related commands 4 2 COMMAND SYNTAX The commands are organized in a hierarchical structure called a Command
65. gement commands saving waveforms VXIbus read write LOCALbus data acquisition memory status and memory allocation MEMON WRITS 4 12 MEMOry READD scssiscscsicctdevscsscz usinvsseacizivwsoteesaewtiveasecassvsavtenssseseuseincissaveatedeseaes 4 12 MEMory SAV EE cee kaa RE rebat da asi ESA Sai es 4 13 MEMOfy ACOUIFO REA 4 14 MEMory CATalog esses eene eene eene nnns ennen rendent antenna nnn 4 14 MEMory DELete iere trt tena rp in ia re rie Feo ead ag 4 15 MEMONIFREE EE ter IHR rr Petre eser tT 4 15 MEMory MALLocale irent norte icit anre ic erar natat 4 16 OUTPut Subsystem Commands that control the analog output conditions for channels 1 and 2 such as attenuation filtering output drive output state tracking mode and Gate delay OUTPut ATTenuation usnrrreravrrervesnrnennvrvevnrnnnvnnnsessnnessnvesnnnsnnnernrsevsnsannrernnsser 4 17 OUTPUEFILTO Liss ads 4 17 OUTPUESTATE una eeeen 4 18 leMizndslhucmee 4 18 OUTPUtTRAGK AL HR 4 19 OUTPUt GAT DELAy iren tto e tete teet ri a Erica ded 4 19 OUTPUtSYNG ST TD 4 20 OUTPUtTTLTIg irren nature T sogra ra be Enea 4 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 Command Reference SOURce Subsystem Commands used for setting function frequen
66. gister Test enne nennen enne nnne nnne 3 31 3 8 6 Running All Diagnostic Tests c cscccceeseecereceeenetseneereneens 3 31 4 DBS8750 Command Reference 4 4 INTRODUCTION eterne nnne ennt hara iin roi eit aen nn 4 1 4 2 COMMAND SYNTAX rreenersnrennvevsvvsvnsvesenrseverssvrensnrarssrsnnnenssnnsesnsnnrnr 4 1 4 2 1 Abbreviated Commands seen 4 1 4 2 2 Command Concatenation weenrooeennennneree 4 1 4 2 3 Command Parameters eese 4 3 4 2 4 Optional Keywords and Parameters eee 4 3 4 2 5 Output Channel Selection see 4 3 4 2 6 Query Commands essen nennen 4 3 4 4 DBS 8750 COMMAND INDEX esee eene 4 4 Appendix A Specifications Appendix B VXI Connections Appendix C Error Messages Appendix D Revision 0 Hardware Tables 2 1 Hardware Jumper Setup Summary eiisanevanneoonnaoennenvannenani 2 1 2 2 Logical Address Setup Examples enersnneneoneeenannenanannee 2 3 2 3 Address Mode Selections 0vvenenenensoennnnnees oote nn nnns 2 3 2 4 TTL Trigger Line Output Selections rrevvrvrrrrnrrnernrnrnrnonnnnnnnrarenn 2 4 2 5 Deglitching Filter Jumper Selections eene 2 5 2 6 OUT 1 amp 2 Default Power On State eee 2 6 3 1 Mathematical Mnemonics and Symbols 3 13 3 2 Trigger Sequence Control Commands
67. hat each DAC Waveform Memory can hold Example The following Trigger Sequence continuously generates 6 cycles of a 5 0 kHz sine wave followed by 10 cycles of a 10 kHz sine wave TRIG1 SEQ1 STAR SOUR1 FUNC SIN VOLT 8 5 FREQ 5000 OUTP1 FILT ON STAT ON TRIG1 SEQ1 COUN 6 TRIG1 SEQ1 STOP TRIG1 SEQ2 STAR SOUR1 FUNC SIN VOLT 5 0 FREQ 10000 TRIG1 SEQ2 COUN 10 TRIG1 SEQ2 STOP INIT1 Related Commands INITiate ABORt Reset Condition Erases all TRIGger COUNt Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TRIGger Subsystem DBS 8750 TRIGger COUNt NOTE In order for Trigger Sequences to run correctly the DBS 8750 must be equipped with firmware revision 2 0 or higher To determine hardware software revision levels refer to the IDN command in Section 4 TRIGger COUNt Description Specifies how many times to repeat the Trigger Sequence s before it returns to the previously programmed waveform This determines the number of times the program loops through Waveform Memory Syntax TRIGger 1 2 COUNt lt sp gt lt numeric gt Numeric Parameter numeric Number of times to repeat all trigger Notes 1 Example sequences where 0 Free Running Mode Always start a trigger sequence by sending the command INITiate It can be stopped with the ABORt command if COUN 0 The designation 1 2 following the keyword TRIGger is
68. hnology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation AER EEE EEE ST AE Figure 3 7 Track Hold Control for Sine Function OUTPut TRACk OFF SOURce ROSClllator SOURce AUTO SHON Eliminates jitter in Sampling Rate Clock yields low distortion ES pp a 286102 CLOCK 4 FL Fr i 350 to 400 kHz Jitter 50ns Track CYP H i Track Hold i DAC Hold 1 iLevel DAC Hold Level i Output Level i GAB DAC Hold Level Track Level OUTPut TRACK OFF SOURce ROSCillator SOURce AUTO SHOF Jitter on both edges of Track Hold yields harmonic distortion CLOCK 350 to 400 kHz Track Track Hold DAC Hold Level Output Level DAC Track Level DAC Hold Level Jitter caused by asynchronicity between internal and external clocks 3 3 9 Using the Deglitching Filter By jumper selection the output signal of each DAC may be passed through a deglitching filter see Section 2 2 4 to reduce the affect of noise and glitch energy on the output Bypassing the deglitching filter provides improved DC output performance and a reduction in sguare wave settling time For hardware revision 1 and up only 3 9 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 3 3 10 Switching the Output Channel State to On Off As shown previous
69. ignals 1 1 1 Functional Overview The DBS 8750 Figure 1 1 generates waveforms using the data placed in the DAC 1 or 2 Waveform Memory 32K words maximum per channel The DAC Sampling Rate is controlled by either the 400 kHz Internal Sampling Rate Clock or an External Sampling Rate Clock received from the Front Panel CLOCK input or one of the TTL Trigger lines via the VXIbus The waveform data can be obtained from any of the following sources 1 Standard Waveform Library Sine Square Triangle Noise and DC functions 2 User Defined Waveform Function Complex waveforms calculated by the DSP according to a prescribed formula and user specified param eters Maximum waveform size is 32K points 3 DSP User Memory The shared DSP User memory has 17150 words of user accessible read write space for saving waveforms and acquiring waveform data from the VXI system All control functions complex waveform calculations and digital signal processing are implemented by the DSP The DSP serves as an intelligent DMA controller for transferring digital data between the VXIbus and the DSP User Memory The DSP also acts as a counter timing sequencer for cross synchronization with other VXI instruments 1 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Figure 1 1 Waveform Synthesizer Block Diagram X DAG 1 BAG2 Waveform Waveform Wo Memor
70. ix D for revision O 2 4 hardware jumpers Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Preparation amp Installation 2 2 4 Deglitching Filter Selection Each channel of the dual D A Converter DAC is fed to a deglitching filter network where the filter can be connected in line with the DAC output or bypassed Table 2 5 Bypassing the filter provides improved DC perfor mance For more information refer to Section 3 3 9 Table 2 5 Deglitching Filter Jumper Selections Selection Channel 1 Channel 2 Application JP21 2 to JP21 3 JP22 2 to JP22 3 Bypassed JP21 1 to JP21 2 JP22 1 to JP22 2 Square Pulse Step Functions DC 2 3 INSTALLATION The 8750 can be installed in any slot except slot 0 Any module used in synchronous operation with the 8750 via the LOCALbus on connector P2 must be installed in the adjacent siot to the right of the 8750 2 3 1 Input Output Control Connections The front panel controls and indicators are described in detail in Section 3 However for installation purposes the characteristics of the input output connections are provided here CLOCK External clock input BNC 5092 accepts a TTL negative going pulse 120 ns min maximum freguency of 400 kHz TRIG External trigger input BNC 509 accepts a TTL active low signal to allow waveform generation GATE Gate output BNC a TTL active low output during wav
71. jumper selected software enabled TTLTRG GATE Output TTLTRG4 7 jumper selected software enabled Precision Clock Accuracy 16 MHz x 0 00596 DSP Processor TMS320C30 33 MHz Front Panel LED Indicator Self Test Pass Fail Green Pass Red Fail Power Required SV Supply sestertia 4 75V min 5 25V max Power Consumption menu 20W max Environmental and Mechanical Rated Performance Temperature 0 C to 50 C Storage Temperature 25 C to 75 C Relative Humidity 0 to 85 non condensing up to 40 C Recommended Forced Air Cooling 10 cubic feet per minute Dimensions esee mee C size VXI VXIbus Compliance Addressing Capabilities Master A244 A32 Slave A16 A24 Data Transfer Capabilities Master D16 Slave D16 Interrupt Levels sssssess 1 to 7 programmable VXI Configuration Registers ID Register Device Type Register Control Status Register and Offset Register Communication Registers Protocol Register Response Register and Data Low Register A 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix B VXIbus Connections Figure B 1 Connector P1 Figure B 2 Connector P2 NOT USED NOT USED NOT
72. ly in Figure 3 3 each of the two analog output channels can be connected or disconnected independently with a relay switch These relays are switched on off by sending the following command OUTPut 11 2 STATe ON or 1 OFF or O ON or 1 Connects the output OFF or 0 Disconnects the output The ON state closes a relay to connect the output amplifier to the front panel OUT 1 2 connector The OFF state opens the relay and switches the connector output pin to ground through 50 or 600 ohms During waveform calculations and initialization you may wish to keep the outputs OFF and only switch them ON after all other parameters have been specified 3 3 11 Selecting the GATE Delay The front panel GATE output produces a TTL active low output signal synchronized with the Sampling Rate Clock during waveform generation The GATE output can be programmed for an output delay of 20 us to 41 945 seconds in 2 5 us increments Figure 3 8 This output can be used as an external trigger or start signal for another VXI instrument such as a DBS 8700 Digitizer By jumper selection Section 2 2 3 this output can be made available on TTL trigger line 4 5 6 or 7 Section 3 3 13 To program the GATE delay send the following command OUTput GAT DELay n where n 0 00002 to 41 945 secs in 2 5 us steps Figure 3 8 TRIG GATE Timing GATE follows TRIG high GATE GATE Delay 20ps 41 945 sec at 1 t 1 For hardware re
73. m eseesosernesevveres EPROM Checksum Test SRAM eee Static RAM SRAM Test ANALOg e DAC Output Test SDRAM 22 DAC Waveform Memory Test REGS sees Register Test SALE EEE All Diagnostic Tests 3 8 1 EPROM Checksum Test Sending DIAGnostic EPRom calculates a checksum and compares it with the correct checksum stored in the EPROM The test passes if the calculated checksum is equal to the stored checksum 3 8 2 SRAM Test Sending DIAGnostic SRAM checks the results of the SRAM diagnostic test which is initiated by any one of three methods 1 cycle the power off and on 2 press the front panel RESET push button or 3 send the RST command This command returns the contents of a memory diagnostic register A return of 0xFA051793 means that the SRAM test passed 3 8 3 DAC Output Test Sending DIAGnostic ANALog initiates a quick functional check of the DAC outputs Various voltages are compared to one another to verify that both channels are operating Both outputs are switched OFF by this test NOTE This test disconnects the outputs and destroys any pro grammed waveforms on either channel 3 30 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation 3 8 4 DAC Waveform Memory Test Sending DIAGnostic DRAM initiates a routine that stores a series of patterns throughout the DAC 1 2 Waveform Memory then reads the stored patterns to verify proper op
74. mory buffer Syntax SOURce 1 2 FUNCtion lt sp gt MEMory lt sp gt lt Buffer Name Query SOUR FUNC Example To generate a waveform on channel 1 using memory buffer lt VDATA gt SOUR FUNC MEM VDATA Related Commands OUTPut commands MEMory commands Reset Condition Erases FUNCtion MEMory and all memory buffers 4 25 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SOURce ROSCillator SOURce l SOURce Subsystem DBS 8750 Command Reference P NOTE Do not use an External Sampling Rate Clock for setting up the output functions Perform all output setup using the Internal Sampling Rate Clock and then switch to the External Sampling Rate Clock for the final operation SOURce ROSCillator SOURce Description Selects the source of the Sampling Rate Clock to control the update rate for both channels Channels cannot be clocked separately Syntax SOURce ROSCillator SOURce lt sp gt INT EXT TTLTrg lt 0 7 gt Query SOUR ROSC SOUR Mnemonic Parameters INT Selects the 400 kHz Internal Sampling Rate Clock EXT Selects the Front Panel CLOCK input TTLTrg lt 0 7 gt Selects one of eight TTL Trigger lines Notes 1 The Internal Sampling Rate Clock is always 400 kHz The output filter is optimized for sine wave generation at this internal rate 2 In general there is no low frequency limit for an external clock The external clock should be a TTL
75. mple With no existing buffers Command MEM CAT Response 0 17150 With three 1000 point buffers Command MEMory CATalog Response 3105 14045 BUFFER1 BIN 1000 BUFFER2 BIN 1000 BUFFER3 BIN 1000 Related Commands Other MEMory commands Reset Condition All existing buffers are deleted MEMory DELete Description Removes DSP USER Memory buffers Syntax MEMory DELete lt sp gt lt mnemonic gt Mnemonic Parameters ALL All buffers Buffer Name Only named buffer Example To delete buffer VDATA and then all buffers MEM DEL VDATA MEM DEL ALL Related Commands All MEMory commands Reset Condition All buffers are deleted MEMory FREE Description Returns the amount of available and used DSP User Memory in the following format lt free memory gt lt filled memory gt Syntax MEMory FREE ALL or MEM FREE BINary Notes 1 All DBS 8750 buffers are BINARY 2 MEM FREE and MEM CAT return the number of free and used words 16 bits not bytes Example MEM FREE ALL Related Commands Other MEMory commands Reset Condition All free memory is available 4 15 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com MEMory MALLocate MEMory Subsystem DBS 8750 MEMory MALLocate 4 16 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Description Allocates a block of DSP
76. nerated and the buffer is not created 2 Ifthe buffer exists and a subsequent read requires a larger buffer the program attempts to re size the buffer If this fails an error message is generated and enough memory is re allocated for the original buffer However the data in the original buffer may be corrupted 3 All DBS 8750 buffers are BINary Up to 20 user buffers may be created 4 The DBS 8750 must allocate contiguous blocks of memory If you have been creating and deleting buffers a MEM READ may fail even though the total amount of free memory is sufficient Example To save 1024 data words from the LOCALbus in buffer VDATA MEM ACQ 1024 VDATA Related Commands Other MEMory commands SOUR FUNC MEM Reset Condition All buffers in SRAM are deleted MEMory CATalog Description Returns a memory status in the following format filled memory gt lt free memory gt lt buffer name gt lt type gt lt size gt lt buffer name gt lt type gt lt size gt lt buffer name gt lt type gt lt size gt etc Syntax MEMory CATalog ALL or MEMory CATalog BINary Note MEMory CATalog ALL returns information about all memory buffers including used and available memory and a list of buffers and buffer sizes 4 14 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com MEMory Subsystem MEMory DELete DBS 8750 Command Reference MEMory FREE A TES EVO ETTE ATS Exa
77. nostic DRAM EEE TJ eee EEE DIAGnostic ANALog Description Provides a quick functional test of the DAC outputs Various output voltages are compared to one another in order to verify that both channels are generating waveforms The front panel LED is red while the test is running and switches to green if the test passes Syntax DIAGnostic ANALog Note Running DIAGnostic ANALog disconnects the outputs and destroys any programmed waveform on both channels Example DIAG ANALOG Reset Condition This diagnostic is included in the self test diagnostics which are invoked by a reset command DIAGnostic DRAM Description Stores a series of patterns throughout the Waveform Memory and reads the stored patterns to verify that the DAC RAM is working properly SRAM is not tested The front panel LED is red while the test runs and switches to green if the test passes Syntax DIAGnostic DRAM Note Running DIAGnostic DRAM disconnects the outputs and destroys any programmed waveform on both channels Example DIAG DRAM Reset Condition This diagnostic is included in the self test diagnostics which are invoked by a reset command 4 9 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DIAGnostic REGS DIAGnostic Subsystem DIAGnostic ALL DBS 8750 DIAGnostic REGS Description Checks for proper operation of the DAC Control Offset and VME Control registers The front panel L
78. ocations Deglitching Filter Bypass NOTE Jumpers JP9 and JP11 JP18 are used only at the factory They are installed at the factory in the following arrangement and should not be altered JP9 and JP11 are always jumpered 2 3 JP12 and JP13 JP18 are always open For hardware revision 1 and up only See Appendix D for revision 0 2 2 hardware jumpers Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Preparation amp Installation E O nn EE t eee ee ee ee SEE 2 2 1 Selecting the Base Address The Base address of a VXI instrument is determined by the following Base Address Logical Address x 64 49152 The Logical Address of this instrument can be set from 0 to 255d using jumpers JP1 through JP8 However Logical Address 0 and 1 cannot be used as these addresses are used by various VXI embedded controllers Table 2 2 list some examples NOTE Do not use Logical Address 0 or 1 These are reserved for system controllers Table 2 2 Logical Adddress Setup Examples VXibus Address Lines amp Jumper Selections Logical VA13 VA12 VA11 VAIO VA9 VA8 VA7 VA6 Address JP8 JP7 JP6 JP5 JP4 JP3 JP2 JP1 2 2 2 Selecting the Address Space The setting of hardware jumper JP10 enables the instrument to operate in either the A24 or A32 addressing mode Refer to Table 2 3 Table 2 3 Address Mode Selectlons A24 Space A32 Space JP10 1 to JP10 2 JP10 2 to
79. of Channels 2 Output Voltage essen x 10V Single Ended 5V Differential Relative to analog ground Resolution nerervrervvrerarvrvvrrvverervever 16 Bit Offset programmable 10V to 10V in 1 LSB steps min Attenuation programmable Coarse 0 dB to 30 dB in 10 dB step Fine 0 003 FSR Gain filter bypass e 120 5 Differential Non Linearity 0 003 of FSR max Output Drive programmable Single Ended or Differential Output Impedance 50 Ohm or 600 Ohm switch selectable Output Coupling eee DC or AC switch selectable Maximum Load Current 40 mA Standard Waveform Outputs Sine Wave Frequency 12 5 Hz to 20 kHz Square Triangle Wave Frequency 12 5 Hz to 30 kHz Peak Distortion PD 96 dB O 1 0kHz 93 dB O 20kHz PD represents the ratio between the highest spurious frequency component below the Nyquist rate and the test signal Total Harmonic Distortion THD 94 dB 9 1 0kHz 90 dB O 20kHz THD represents the ratio between the rms sum of all harmonics up to the 20th harmonic and the rms value of the test signal Settling Time esses 16 us to 1 LSB after 10V step output filter bypassed deglitching filter in line Offset Voltage occ x20 mV typ Filters Filter Type isis eerie iratis 6
80. on Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Figure 3 13 Log Function Output CALCulate 1 2 MATH FOR 005 SIN 4 pi LOG t 0 0001 Figure 3 14 Exponential Output Waveform CALCulate 1 2 MATH FOR 003 1 1 e 1000 t VOLTS 1 Figure 3 15 Rectification Using Absolute Function CALC MATH FOR 002 SIN 2 pi 2000 t FOR 002 ABS 1 SIN 2 pi 2000 t VOLTS 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation EEE ES PL SSE VP TA l 3 4 2 SOURce FUNCtion MEMory Waveforms A MEMory waveform is defined by the contents of a memory buffer which was previously created in the 8750 DSP User Memory A memory buffer is created whenever waveform data is transferred to the DSP User Memory from VXI memory or an adjacent Digitizer module via the LOCALbus To select a MEMory waveform send SOURce 1 2 FUNCtion MEMory Buffer Name This transfers the data in Buffer Name from DSP User Memory into DAC Waveform Memory from which the DAC generates the waveform If you wish to switch between several user defined output waveforms it is best to place them in individual memory buffers and then select the wave forms using the SOURce FUNCtion MEMory command This is faster than the USER function because each time you select USER the DBS 8750 requires time to re evaluate the CALC statement before placing the results in the
81. or SOURce AUTO SHON SHOF SHON Synchronize Track and Hold with Front Panel CLOCK input SHOF Synchronize Track and Hold with Internal Sampling Rate Clock Default Figure 3 6 Synchronizing the Track Hold D A CONVERTER OUTPUT FILTER SHON SHOF SHON i Track Only ON Front Panel CLOCK a a A Internal Sampling O t Track and Hokd OFF Rate Clock SHOF OUTP TRAC ON OFF 3 3 8 3 Controlling Track and Hold with a Front Panel CLOCK An External Sampling Rate Clock connected to the Front Panel CLOCK input not the TTLTRG lines can be used to control the DAC Track and Hold Output Amplifiers Figure 3 7 This feature is especially useful for generating low distortion Sine waves For this purpose the CLOCK input should be a 350 to 400 kHz negative going pulse with a pulse width of 1 2us 50ns and less than 100 pS of jitter Refer to Section 3 7 for informa tion on selecting clock sources Figure 3 7 shows the affect of clock synchronization on the Track and Hold control In the top half of the diagram Track and Hold is synchronized with the External Sampling Rate Clock from the Front Panel The bottom half shows synchronization with the Internal Sampling Rate Clock This diagram clearly shows that low distortion sine waves can be generated while Track and Hold is synchronized with an External Sampling Rate Clock because there is less jitter on the Track and Hold control signal Artisan Tec
82. parate Commands Concatenated Format SOURce FUNCtion SINe SOURce FUNCtion SINe VOLTage 10 F REQuency 400 lt Read Data Low gt lt Read Data Low gt SOURce VOLTage 10 lt Read Data Low gt NOTE Concatenated commands require SOURce FREOuency 400 fewer read back commands Therefore lt Read Data Low gt fewer bus cycles are needed 4 2 3 Command Parameters Q Numeric Some commands use variable parameters which include a range of values such as output attenuation gate delay frequency amplitude and offset voltage Numeric variables can be expressed using signs decimal points and scientific notation Numeric parameter values must be preceded by a space lt sp gt Q Boolean Boolean parameters are a single binary condition that is either true or false such as ON OFF 1 or 0 Q Discrete Discrete parameters use mnemonics to represent each valid setting For example the command OUTPut 1 DRIVe lt mnemonic gt selects the output drive configuration using the mnemonics SINGle ended and DIFFerential 4 2 4 Optional Keywords and Parameters Command keywords and parameter values selections that are shown within brackets are optional For parameters the brackets indicate default values selections The brackets are not part of the command and if you don t specify a value selection in the command the default value selection is used Any alternate value is shown in parentheses immediately following the bracketed v
83. pole Butterworth Modes of Operation ON or bypass programmable Pass Band Frequency 25 kHz 3dB point Flatness in Pass Band 0 1dB to 10 kHz 0 25dB to 20 kHz max Attenuation in Stop Band 90 dB Settling Time ss sem 250us to 16 bit accuracy max overshoot gt 2 5V For a 20 volt step function with Filter ON A 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual Stability 0 C to 50 C Required Warm up Time 15 minutes for ultimate specifications Offset Tempco 23 pV C typ 75 pV C max Gain Tempco eee 40 ppm FSR C Max Differential Non Linearity Tempco 0 3 ppm FSR C Max Memory DAC Waveform Memory 32K words channel maximum waveform size DSP User Memory sseee 32K longwords SRAM 17150 words read write accessible to user Triggering and Synchronization Front Panel CLOCK Input TTL level active low 400 kHz maximum frequency minimum pulse width 120 ns Front Panel TRIG input TTL level active low level Front Panel GATE Qutput TTL level active low during waveform genera tion programmable delay of 20 us to 41 94 sec TTLTRG Input Sampling Rate Clock TTLTRGO 7 software selected TTLTRG Output Sampling Clock TTLTRGO 3
84. rdware revision 1 and up only 4 19 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com OUTPut SYNC OUTPut Subsystem OUTPut TTLTrg DBS 8750 Command Reference VERE VEE on AX ay I VE AT OUTPut SYNC Description Re starts waveform generation on outputs 1 and 2 at the same time regardless of their current phase relationship The waveforms stay synchronized only if they have a harmonic relationship from the start Syntax OUTPut SYNC Parameters None Notes 1 Sine waves and square waves will have a 0 degree phase difference when OUTP SYNC is executed 2 Triangle waves will have a 90 degree phase difference with sine amp square waves Example To set the outputs to run synchronously OUTP SYNC Related Commands None Reset Condition Outputs are synchronized OUTPut TTLTrg Description Enables the TTLTRG lines to drive the selected output onto the bus TTLTRG 0 3 can drive the Sampling Rate Clock and TTLTRG 4 7 can drive the GATE Syntax OUTPut TTLTrg lt sp gt lt boolean gt Boolean Parameters ON or 1 Enable TTLTRG OFF or 0 Disable TTLTRG Notes The TTLTRG line is selected by installing a hardware jumper See Section 2 2 3 Example To enable the TTLTRG lines send OUTP TTLT ON Related Commands None Reset Condition OUTPut TTLTrg OFF For hardware revision 1 and up only See Appendix D for revision 0 4 20 hardware TTLTRG I O functions Ar
85. register is set to 129 Power on Operation Complete Related Commands CLS sets the Event Status register to 0 IDN Description Identification Query returns the manufacturer model number and revision levels of the DBS 8750 in the following format Analogic DBS8750 lt Hardware Rev gt lt Fimware Rev gt Syntax IDN Related Commands None 4 34 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com System Commands OPC SRE DBS 8750 RST STB OPC RST SRE STB Description Operation Complete The OPC command has no effect on the DBS 8750 since the instrument is strictly a sequential system OPC always returns 1 Syntax OPC Related Commands WAI Reset Condition Operation complete is 1 Description Reset executes the equivalent of a power on or front panel reset All diagnostic tests are executed and the instrument returns to it s quiescent state Syntax RST Related Commands None Note Command is ignored during waveform calculation Description Service Request Enable sets the service request enable register to the value in the command SRE returns the value previously set The service request enable register in the DBS 8750 is of no operational significance Syntax SRE 0 255 Related Commands None Reset Condition SRE register is 0 Description Status Byte returns the value of th
86. rnersnssnneessenenersessen 3 18 3 5 3 Read Write VXI Memory cessent enn 3 20 3 5 4 Acquiring LOCALbus Data ersrereaenovnroeanennnennnaenes 3 20 3 5 5 Allocating Memory rreresvenvnvvevnrnannnrerssvvensvnvnennnesennvrssssnnssensnr 3 21 3 5 6 Memory Status sese ener entente 3 22 3 5 7 Deleting BufferS eienennereonenneoonenvannevoonaennnnenee 823 TRIGGERING siii iiri ere teen tere EE ra er ea e Len eda 3 23 3 6 1 Internal Trigger rrersvvanvvrvarenrnnnrnvranrenvavsrvnnsneneannenrsnvansnnnvrenene 3 23 3 6 2 External Trigger eese 3 23 3 6 3 Trigger Sequences eeeeeeeeeen eme 3 24 3 6 3 1 Programming Guidelines eene 3 24 3 6 3 2 Example 1 Complex Wave Burst Internal Trigger srrovnrnronvnnnrnavennvnnvernrnnnvnrnnsrsnsensenner 3 26 3 6 3 3 Example 2 Sine Wave Burst External Trigger essen 3 27 3 6 3 4 Example 3 Free Running Complex Wave 3 28 CLOCK SOURCES ii ccccssccessisecsssessesceseessideateassasnevesennavssacgatcetenstszecee 3 29 DIAGNOSTIC TESTS seen nenne 3 30 3 8 1 EPROM Checksum Test eene emen 3 30 3 8 2 SRAM Test SERRE 3 30 3 8 3 DAC Output Test momorrervorvenvrvarnervvverrreversersevernsrevervansrnensenne 3 30 3 8 4 DAC Waveform Memory Test rrnssnrenerrennesnnreversnvnrenenvarsannnr 3 31 3 8 5 Re
87. rtisantg com Bypassed 0 00 dB Differential OFF DC 1000 00 Hz 0 00 V 0 00 V None defined Internal internal 0 0 2 4 2 Initial Checkout Preparation amp Installation The following procedure describes tests that can be performed to verify that the instrument is in good operating condition NOTE 1 2 3 4 6 6 7 8 9 10 11 12 13 14 15 16 17 18 For proper operation the Data Low Register must be read following every command sent to this instrument except for the command RST Normal response is the new line charac ter x0A or a status message Action Send RST Send IDN Read Data Low Register Send DIAG ALL Read Data Low Register Send DIAG Read Data Low Register Connect an oscilloscope probe to OUT1 Send SOUR1 FUNC SIN Read Data Low Register Send SOUR1 VOLT 5 Read Data Low Register Send OUTP1 DRIV DIFF Read Data Low Register Send OUTP1 STAT 1 Read Data Low Register Repeat steps 8 through 16 for OUT2 Send RST Response System reset Module identification guery Analogic DBS8750 Rev n Firmware Revision All diagnostics run PASS FAIL is red switches to green after all tests pass x0A Diagnostic status query No errors self test PASSED Selects sine function x0A Selects 5 volt amplitude x0A Selects differential output drive x0A 1 kHz 5 volt sine wave on OUT 1 x0A 1 kHz
88. size the buffer 225 Out of memory not enough waveform memory for requested signal 255 Directory Full 310 System error VME BUSERR DMA Transfer Aborted C 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual DIAGNOSTIC TEST ERROR MESSAGES After a diagnostic failure or at any time the diagnostic message status can be obtained by sending the query command DIAGnostic 0 No error Self test PASSED 330 Self test failed Static RAM failed self test 330 Self test failed DAC RAM 0 memory error 330 Self test failed DAC RAM 1 memory error 330 Self test failed DAC control register error 330 Self test failed DAC rate register error 330 Self test failed DAC 0 address register error 830 Self test failed DAC 1 address register error 330 Self test failed VME offset register error 330 Self test failed VME control register error 330 Self test failed EPROM memory error 330 Self test failed DAC analog output error C 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix D Revision 0 Hardware NOTE Bold outline in jumper tables indicates iiid settings ETE LE ELT owe FR ba BSE TTLTRG Selection JP19 JP20 Address 321 ve Don Doni ee ues Poe a JP OO n m JP2 Factory
89. than or equal to 32K words the maximum number of points that each DAC Waveform Memory can hold Sets the repeat counter which controls the number of times to repeat all trigger sequences Actually this specifies the number of times the program reads through waveform memory TRIGger COUNt INITiate 1 2 ABORI 1 2 Arms the Trigger Sequence for execution 1f this command is sent while in the Internal Trigger Mode the trigger sequence is executed immediately If in the External Trigger Mode the sequence is executed when a positive TTL level is present on the TRIG input Stops execution of the Trigger Sequence Trigger Sequence information is saved and the instrument is returned to its previous state 3 25 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual a a ke lt A ENN BP PE FRP PI VPN ou a 3 6 3 2 Example 1 Complex Wave Burst Internal Trigger This Trigger Sequence creates three cycles of a 1 kHz square wave followed by two cycles of a 1 kHz triangle wave and repeats the composite waveform three times The Internal Trigger is selected by a reset default setting a Reset the instrument TRIGI SEQUUSTARL Start of SEQuence1 for OUT 1 SOUR1 FUNC SQU Select square wave SOUR1 VOLT 5 FREQ 1000 Select 5 volt amplitude
90. tion Tangent Multiply Arc sine Divide Arc cosine Raised to the power Arc tangent Parentheses Natural log base e 12 7182818 Common log base 10 PI 3 1415927 Absolute value SIN Sine Time variable t 0 at start 3 14 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation Following a power on cycle or a system reset the last USER function calculated is lost making the USER function undefined To generate a USER waveform first define the waveform using the CALCulate 1 2 MATH command and then send the command SOURce 1 2 FUNCtion USER which transfers the user defined waveform into Waveform Memory To change the USER function send another CALCulate 1 2 MATH command to replace the previously calculated waveform Example waveforms are shown in Figures 3 11 through 3 15 These examples were performed with a single ended output internal clock no filter and no attenuation NOTE Because of the methods used to calculate waveforms the actual output may not appear exactly as Illustrated Figure 3 11 Complex Waveform By Segments CALC MATH FOR 001 5 FOR 0015 1 FOR 0005 5 FOR 001 75 FOR VOLTS FOR 0015 1 FOR 001 1 Figure 3 12 1 kHz Sine Wave Output CALCulate 1 2 MATH FOR 005 SIN 2 PI t 1000 VOLTS 1 3 15 Artisan Technology Group Quality Instrumentati
91. tisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SOURce Subsystem SOURce FREQuency DBS 8750 SOURce VOLTage SOURce FREQuency Description Sets the frequency of standard output waveforms Syntax SOURce 1 2 FREQuency lt sp gt lt Numeric gt Query SOUR FREQ Numeric Parameters 12 5 Hz to 20000 Hz using internal clock Note Using an external clock the low frequency limit for output waves is defined by the external clock Example To set frequency to 15 12 kHz for channel 2 SOUR2 FREQ 15120 Related Commands All OUTPut commands Reset Condition Frequency is set to 1000 Hz for both channels SOURce VOLTage Description Sets voltage amplitude for standard output waveforms Syntax SOURce 1 2 VOLTage lt sp gt lt numeric gt Query SOUR VOLT Numeric Parameters 10V to 10V Example To set the channel 2 output voltage to 9 981 Volts SOUR2 VOLT 9 981 Related Commands All OUTPut commands Reset Condition Both output channels are set to 0 Volts 4 21 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com SOURce VOLTage OFFSet SOURce Subsystem SOURce FUNCtion DC DBS 8750 Command Reference SOURce VOLTage OFFSet Description Sets DC offset for standard output waveforms Syntax SOURce 1N2 VOLTage OFFSet lt sp gt lt numeric gt Query SOUR VOLT OFFS Numeric Parameters 10V to 10V Note Output voltag
92. used to select the channel being programmed If TRIGger COUNT is 0 or omitted the trigger sequences are repeated continuously If the number of counts does not equal O the trigger sequences will execute the specified number of times after INIT then the channel will return to the waveform being generated before the INITiate command The following list of commands generates 6 cycles of a 5 0 kHz 8 5 volt Sine wave and 10 cycles of a 10 kHz 5 volt Sine wave The entire ouput pattern is repeated15 times and then the output returns to 0 Volts SOUR1 FUNC DC VOLT 0 OUTP1 STAT ON FILT ON TRIG1 SEQ1 STAR SOUR1 VOLT 8 5 FREQ 5000 TRIG1 SEQ1 COUN 6 STOP TRIG1 SEQ2 STAR SOUR1 FUNC SIN VOLT 5 0 FREQ 10000 TRIG1 SEQ2 COUN 10 TRIG1 SEQ2 STOP TRIG1 COUNT 15 INIT1 Related Commands INITiate ABORt Reset Condition Erases all TRIGger COUNt 4 31 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TRIGger SOURce EXT TRiGger Subsystem TRIGger SOURce INT DBS 8750 Command Reference TRIGger SOURce EXT Description Selects the Front Pane TRIG input The TRIG input signal is synchro nized with the internal 16 MHz clock and may be used to initiate trigger sequence operation Syntax TRIGger 1 2 SOURce lt sp gt EXT Example To set the external trigger mode TRIG SOUR EXT Related Commands None Reset Condition Sets trigger mode to internal TRIGger SO
93. ution of the DACs A very low noise DC to DC converter designed to accommodate the stringent demands of a highly accurate 16 bit waveform synthesizer provides power to the isolated analog section Powered by 5 volts from connectors P1 and P2 the DC to DC converter provides regulated and filtered 15 15 and 5 volts for the entire analog output circuitry 1 1 2 Accessories Q DVX05 3 3 foot cable connector assembly Q DVX05 5 5 foot cable connector assembly These assemblies consist of a TWBNC connector attached to either a 3 foot or 5 foot length of twisted shielded pair cable The other end of the cable has two cable conductors and a shield available for direct connection to the user s hardware application i 1 2 TECHNICAL SUPPORT For service contact your nearest Tektronix Service Center For technical support call 1 800 835 4894 for technical support in the U S or contact your nearest Tektronix Office outside the U S Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual 1 4 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Section 2 Preparation amp Installation 2 1 OVERVIEW This section provides instructions for setting up hardware jumpers and installing the instrument in a VXI chassis After unpacking carefully inspect the hardware for any damage that may have occurred during ship
94. ve been creating and deleting buffers a MEM READ may fail even though the total amount of free memory is sufficient 5 The number of waveform points must not exceed the amount of free memory see MEM FREE minus 35 points for buffer overhead However the DBS 8750 must allocate contiguous blocks of memory If you have been creating and deleting buffers MEM READ may fail even though the total amount of free memory is sufficient Example To save a waveform in DAC 2 memory to buffer VDATA1 MEM SAV2 VDATA1 Related commands SOUR FUNC MEM other MEMory commands Reset Condition All buffers in SRAM are deleted 4 13 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com MEMory ACQuire MEMory Subsystem MEMory CATalog DBS 8750 MEMory ACQuire Description Transfers a block of data from the LOCALbus and stores it in a specified DSP User Memory buffer Syntax MEMory ACQuire lt sp gt lt Npts gt lt sp gt lt Buffer Name gt Npts number of data points bytes to be stored lt Npts gt must not exceed the amount of free memory see MEM FREE minus 35 points for buffer overhead Buffer Name name of DBS 8750 buffer to receive data Notes 1 Ifthe specified buffer does not exist a new one is created If the buffer already exists the previous waveform data is lost If enough memory cannot be allocated for the user buffer an error message is ge
95. vision 1 and up only See Appendix D for revision O 310 hardware jumpers Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operation ll 3 3 12 Synchronizing the Output Channels The channel 1 and 2 output waveforms can be synchronized with each other regardless of their current phase relationship by sending the OUTPut SYNC command the 1 2 designation not required This simultaneously resets the DAC memory address generator for both channels and starts generating the waveforms from their starting addresses The waveforms stay synchro nized providing they have a harmonic relationship from the start 3 3 13 Using the TTL Trigger Lines The TTL Trigger Lines can be used to synchronize 8750 operation with another instrument Before using any particular line a hardware jumper must be installed Figure 3 9 An External Sampling Rate Clock that is being driven onto the bus from another source can be received on any TTLTRG line The input line is selected by the command SOURce ROSCillator SOURce TTLTRG lt 0 7 gt The 8750 can drive two signals onto the VXIbus the Sampling Rate Clock and the GATE output pulse the same signal generated from the GATE connector on the front panel The Sampling Rate Clock can be driven onto TTLTRG 0 1 2 or 3 The GATE output pulse can be driven onto TTLTRG 4 5 6 or 7 Once the jumpers have been correctly installed the TTLTRG signals are enabled b
96. y OUTP FILT Boolean Parameters ON or 1 connects the 6 pole filter OFF or 0 disconnects the 6 pole filter Note Set output filter ON to generate low distortion SINE waves Example To set the channel 2 output filter ON OUTP2 FILT ON Related Commands OUTPut 1 2 FILT 1 OUTPut 1 2 FILT 0 Reset Condition Filter OFF 4 17 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com OUTPut STATe OUTPut Subsystem OUTPut DRiVe DBS 8750 Command Reference OUTPut STATe Description Switches outputs OUT 1 and OUT 2 on or off Syntax OUTPut 1 2 STATe lt sp gt lt boolean gt Ouery OUTP Boolean Parameters ON or 1 Connects output amplifiers to the output jacks OFF or 0 power on state Disconnects output amplifiers and switches output to ground through a 50 or 600 ohm resistor Example To set the channel 2 output filter ON OUTP2 STAT ON Related Commands OUTP ON OUTP OFF OUTP 1 OUTP 0 Reset Condition OUTPut 1 2 STAT OFF OUTPut DRIVe Description Sets the output stage to either a single ended or differential output drive Syntax OUTPut 1 2 DRIVe lt sp gt lt mnemonic gt Query OUTP DRIV Mnemonic Parameters SINGle ended single ended drive configuration DIFFerential differential drive configuration Note Example To set the channel 2 output to a differential drive OUTP2 DRIV DIFF Related Commands None
97. y Memory emory 32K words 32K words PROM DSP User Shared Memory 32K SRAM MO O PNaMmAZ DC to DC Converter On the front panel an External Trigger input an External Clock input and a Gate output provide synchronization controls To cross synchronize its operation with another VXI instrument such as a DBS 8700 Digitizer the DBS 8750 uses the VXIbus TTL Trigger lines to provide a Sampling Rate Clock and or GATE output or to receive an External Sampling Rate Clock NOTE The DAC Waveform Memories are not accessible from the E VXIbus The shared DSP User Memory has 17150 words of user acccessible read write space for data transfers to from VXI memory or from the LOCALbus via connector P2 After data has been loaded or processed the DSP writes the final values into the DAC 1 or 2 Waveform Memory In the write mode the memory is addressed by the DSP while in the read mode the memory is addressed by a set of address counters In turn each DAC memory has its own independent address counter which allows independent waveform generation at each of the two outputs While operating from pre loaded commands and after the address counter has reached its last address the channel loops back and continues to output the same waveform until a new command is entered at which time generation of a new waveform begins Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Introduction
98. y sending the OUTPut TTLTrg ON command Refer to Section 2 2 3 for jumper selection information Figure 3 9 TTLTRG I O Functions TTLTAG Output Enable OUTP TTLT ON B 1 Sampling Rate Clock TTLTRG3 TTLTRG2 TTLTRG input Line Select TTLTRG SOUR ROSC SOUR TTLT lt 0 7 gt TTLTRG Trigger in For hardware revision 1 and up only See Appendix D for revision 0 hardware jumpers 3 11 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com DBS 8750 User s Manual EE EEE TAA ERE VEERE 3 3 14 Generating Clean Sguare Stalrcase Waves When generating standard square waves using the 400 kHz Internal Sam pling Rate Clock clock related noise is evident on the output wave when ever the data point values stay the same across multiple clock edges Figure 3 10a This happens because the internal Track and Hold circuit of the DAC is switched at every rising clock edge One solution to this problem is to switch the Track and Hold mode to Track Only but this creates a different set of problems The recommended technique is to use an External Sampling Rate Clock and create the square wave so that each different data point value corresponds with a single rising clock edge Figure 3 10b The secret to this technique is to remember that the 8750 always calculates waveforms based on a 400 kHz sampling rate If you want a square wave to change state on every rising clock edge you must

Analogic DBS8750 Manual

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