555_manual - Berkeley Nucleonics Corporation
Contents
1. INTRODUCTION This manual is designed to familiarize you with the Berkeley Nucleonies Model 555 pulse generator Rather than the usual array of knobs and switches the 555 uses a menu driven user interface with on line help once you learn the basics of operating your 555 you may never need to refer to this manual again The 555 has some unique features that are designed exclusively for use as a laser trigger signal generator but can also be used as a general purpose pulse generator Because it employs a flexible microprocessor controlled architecture the 555 can be customized to fit your exact requirements contact Berkeley Nucleonics for details Technical Support For questions or comments about operating the 555 contact Berkeley Nucleonics via one of the following methods Phone 415 453 9955 Fax 415 453 9956 Internet www berkeleynucleonics com Parts List The following parts are included with the 555 contact Berkeley Nucleonics if any parts are missing 555 Pulse Generator AC Power Cord User s Manual Warranty In addition to a 30 day money back guarantee the 555 has a one year limited warranty from the date of delivery This warranty covers defects in materials and workmanship Berkeley Nucleonics will repair or replace any defective unit Contact us for information on obtaining warranty service Warranty does not apply to defects resulting from Improper or inadequate maintenance or cal2. Or Mm cr lt f gt Where n is one of the following error codes Query only command needs a question mark Invalid query command does not have a query form 1 Incorrect prefix 1 e no colon or to start command 2 Missing command keyword 3 Invalid command keyword 4 Missing parameter 2 Invalid parameter 6 7 24 Interface Examples Example 1 20 ms pulsewidth 2 3 ms delay 10 Hz internal continuous operation PULSE1 STATE ON cr lt f gt PULSE1 POL NORM cr lt If gt PULSE WIDT 0 020 cr lt If gt PULSE1 DELAY 0 0023 cr 1f PULSEO MODE CONT cr lt If gt PULSEO PER 0 1 cr lt If gt enables channel A sets polarity to active high sets pulsewidth to 20 ms sets delay to 2 3 ms sets system mode to continuous sets period to 100 ms 10 Hz PULSEO EXT MODE DIS cr lt If gt disables the external trigger To start the pulses use either of the following commands PULSEO STATE ON cr lt f gt INST STATE ON cr lt If gt starts the pulses alternate form to start pulses Example 2 25 ms pulsewidth O is delay external trigger one pulse for every trigger PULSE1 STATE ON cr di PULSE1 POL NORM cr df PULSE WIDT 0 000025 cr lt f gt PULSEI DELAY O cr lt f gt PULSEO MODE SING cr lt f gt PULS EXT LEV 2 5 cr lt f gt PULS EXT EDGE RIS cr lt lf gt enables channel A sets polarity to active high sets pulsewi
3. 38400 Baud All instrument functions and settings may be controlled over the interface bus GPIB optional IEEE 488 2 Configuration Memory Twelve 12 complete configurations may be stored and recalled from the front panel or the computer interface Weight 6 Ibs Dimensions 8 25 x 8 25 x 5 5 Power 100 240 V 50 60 Hz 1 A max Storage Temperature 40 degrees C to 85 degrees C Class 1 Equipment II Earth grounded mains supply required Pollution Degree II Overvoltage Category II Safety Designed in compliance with EN 61010 1 EMC Innumity EN61326 1 2000 General Requirements Emissions EN55011 1998 Class B Normal Operating Conditions Indoor use only Altitude up to 2 000 m Temperature 5 degrees C to 40 degrees C Maximum relative humidity 80 for temperatures up to 31 degrees C decreasing linearly to 50 relative humidity at 40 degrees C Mains supply voltage fluctuation up to 10 of the nominal voltage 29 MENU SUMMARY CHANNEL Menus Timing Parameters Pulse Configuration Special Functions Gated Operation Enable Enable Enable Enable Polarity Pulsewidth Output Type Mode Gate Enable Divide by N 3 Delay Output Level Burst Polarity MODE Menus To Mode To Mode To Mode To Mode Oscillator MODE Continuous MODE Single Shot MODE Burst MODE Duty Cy
4. characters are acceptable For example If the command keyword is given as POLarity the POL and POLARITY are both acceptable forms truncated forms such as POLAR will generate an error polarity pol and PolAriTy are all acceptable as the pulse generator is not case sensitive SCPI Command and Query Format SCPI commands control and set instrument specific functions such as setting the pulsewidth delay and period SCPI commands have a hierarchical structure composed of functional elements that include a header or keywords separated with a colon data parameters and terminators PULSEL STATE ON cr If PULSel WIDth 0 000120 cr 1f PULSe POL NORMal cr If A colon always separates one keyword from the next lower level keyword A space must be used to separate the keyword header from the first parameter If more than one parameter is used you must separate adjacent parameters with a comma Any parameter may be queried by sending the command with a question mark appended For example PULSE1 STATE Will retum cr lt If gt PULSEI WIDT cr lt Will return 0 000120000 cr 1f PULSE1 POL cr lf Will retum NORM cr lt If gt 22 SCPI Keyword Separator A colon must always separate one keyword from the next lower level keyword SCPI Option Keyword Optional keywords and or parameters appear in square brackets in the command syntax Note that the brackets are
5. clear key CLR Pressing the CLR key a second time will exit the numeric keypad mode and restore the original number 9 Item Edit Mode When the current item is non numeric the Up and Down arrow keys are used to select among different options for the parameter The adjustment knob may also be used to change the selection If the item is an on off toggle the Up arrow CW adjustment knob enables the item and the Down arrow CCW adjustment knob disables the item Alphanumeric Input Mode When the current item is alphanumeric the system enters the Alphanumeric Input Mode In this mode data is entered using the alphanumeric keypad When entering alphanumeric values pressing a key will display the first letter shown on the keypad Repeated key presses will toggle through all the letters both upper and lower case shown on the keycap To enter two letters which appear on the same keycap select the first character then use the right arrow to shift to the next position and enter the next letter The Left and Right arrow keys may be used to position the cursor to edit any character When data entry is complete the ENTER key must be pressed The keys contain the following characters 1234567890 ABCabc2 DEFdef3 GHIghi4 JKLJKIS MNOmno6 PORSpqrs7 TUVtuv8 WXYZwxyz9 0123456789 es amp e space e GSFCOMmMANANBRWN 10 MENUS CHANNEL Menu CHANNEL Menus Timi
6. not part of the command and should not be sent to the pulse genera tor When sending a second level keyword without the optional keyword the pulse generator assumes that you intend to use the optional keyword and responds as if it had been sent SCPI Specific and Implied Channel Some commands such as PULSe allow specifying a channel with an optional numeric keyword suffix The suffix will be shown in square brackets 1 2 The brackets are not part of command and are not sent to the pulse generator The numeric parameters correspond to the following channels 0 To I ChA 2 ChB etc Only one channel may be specified at a time If you do not specify the channel number the implied channel is specified by the INSTrument SELect command or the last referenced channel After power up or reset RST The instrument default is channel 1 SCPI Parameter Types The following parameter types are used numeric value Accepts all commonly used decimal representation of numbers includ ing optional signs decimal points and scientific notation 123 12362 123 1 2362 123 1 23e 2 1 2300E 01 boolean value Represents a single binary condition that is either true or false True is represented by a 1 or ON false is represented by a 0 or OFF Que ries return 1 or 0 2 295 lt identifier gt Selects from a finite number of predefined strings Error Codes The unit responds to all commands with either ok cr lt If gt
7. read only field The label is changed in the Store menu NOTE The number of storage locations is model dependent see the speci fications for your model 16 AUXILIARY Menus AUX 1 Menu Pulsewidth Delay Ch A Pulsewidth Ch A Delay Ch B Pulsewidth Ch B Delay Ch C Pulsewidth Ch C Delay Ch DPulsewidth Ch D Delay The auxiliary menus provide a location for special functions to be added for semi custom units In addition the Auxiliary 1 menu provides summary menus for pulsewidth and delay Thus providing a location to change all the delays and or pulsewidths without having to go through all the channel menus NOTE The Auxiliary 1 Menu has summary pages for pulsewidth and delay which allow you to change all the widths or delays from one menu AT 18 BASIC OPERATION With the channels in the normal mode operation of the unit is controlled by the system mode and the external trigger The basic modes are as follows Operational Modes w o External Trigger Continuous RUN STOP button starts and stops a continuous pulse stream at the rate specified by the RATE menu This corre sponds to the normal output mode for most pulse generators Single Shot RUN STOP button generates a single pulse Burst RUN STOP button generates a stream of n pulses where n is specified by the Burst parameter The rate is specified in the RATE menu Pressing the RUN STOP button while the burs
8. the timer will only generate one delayed pulse for every start pulse received Once the channel timer has started counting additional start pulses will be ignored until the pulse has been completed nonretriggerable The start pulse for each channel is provided by the internal To pulse generated by the Internal System Timer Whether or not a pulse is generated for each To pulse is determined by the Channel Mode Generator Standard modes include Normal a pulse is generated for each To pulse Single Shot a pulse is generated at the first To pulse 7 Burst a pulse is generated for each To pulse n times after which output is inhibited Divide by n a pulse is generated every n To pulse Different modes may be selected for each output allowing a wide variety of output combina tions Each output may also be independently disabled or gated using the external trigger input The System Timer functions as a non retriggerable multivibrator pulse generator This means that once started depending on the mode the timer will produce pulses continuously Before pulses will be generated the timer must be armed and then receive a start pulse Arming the counter is done by pressing the RUN key With external trigger disabled the RUN key also generates the start command for the counter With external trigger enabled the external trigger provides the start pulse In either case once started the counter operation is determined by the System Mode Gene
9. BNC 555 Series Pulse Generator User s Manual Berkeley Nucleonics Corporation 2955 Kerner Blvd San Rafael CA 94901 Phone 415 453 9955 Fax 415 453 9956 www berkeleynucleonics com Contents TN TRO DUC VION sies sesse ase eie eer beide ede EG sede ads 1 Technical Support near ten APR DE Ge DRO O Parts List A YF HN HR YH NR FR Y NN HYNY SaletyISsueSsu a LE A EE CONTROLS amp CONNECTORS 22 22 ocn ee Ge vice pets 5 Front Panel ES N GE Ke ee CASIN SUE ee EG EG Ee Y YD Y O GYN eo Ee gt Display Layout and Indicators eee ee ee ee ee ee Ee ee ee DO ee ee ee ODD ee ee ee DDO O ee ee ee ee ee ee ee ese 5 6 AE ER RR RE OR ER GR Ee Parameter Adjustment Knob es ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee BASIC OPERATION S nne ose tr Dti ER 7 MM y D ETAF OD RR OuicKStart i Yy Ed se Ee FFY GY Y ee OE ee EN Fd ye 7 8 Selectmig MeIlUS iore ee gede de TW GYNNO sg Ge ee YER EN PRO ee dee ee ede ede ee Y Selecting Menu Items esse eie ese C X Numeric Input Mode iseer san Item Edit Made see se GE ee Ne N Es ese ed ee LU Alphanumeric Input Mode unseren neuster LO MENUS EE HY Y sees eres sees esse sees ee esses ree see eee ee eee ee sees sere eee eee ses esses sesesees 1 1 AAA A LL Enable Disable 22000000000000000000000000202000000000000 0002 0000000000 000000 nn nnnnsnsnnnnnnsnsnnnsnnsnsnnnn
10. DE Single Shot MODE Burst MODE Duty Cycle DCOn OSC Out 3t Burst DC Of OSC In Modes MODE Selects the To mode Continuous Single Shot Burst or Duty Cycle mode BURST Sets the number of pulses to be generated when in the Burst GATE POLARITY Selects the channel output mode continuous single shot burst or divide by n Sets the number of pulses to be generated in the burst mode Sets the divisor for the divide by n mode Enables disables the channel gating using the external trigger input This function is independent of any other use of the trigger input Care should be taken to insure that all uses of the trigger are compatible Sets the gate to active low or active high NOTE The gate function disables the channel from being triggered by the To pulse To prevent partial pulses from being generated the gate does not disable the channel timers Thus if a pulse has already started when the gate disables the channel the pulse will continue normal output but will not restart on the next To pulse mode 12 DC ON DC OFF NOTE Any mode may be started by either the RUN key in the internal trigger mode or armed by the RUN key and started by an external trigger in the external trigger mode In the single shot and burst modes internally triggered the unit disarms itself at the end of the pulse train Pressing the RUN key after the unit ha
11. cle DC On OSC Out Burst DC Off OSC In RATE Menu To Period To Period 33 GATE TRIGGER Menus Gate Trigger Mode Gate Trigger Mode Gate Trigger Mode MODE Disabled MODE Triggered MODE Gated THRESHOLD THRESHOLD THRESHOLD EDGE POLARITY SYSTEM Menus Keypad Comm Parameters Misc Parameters Parameters Baud Rate Key Repeat Rate Echo Enable Key Volume Decimal Mark GPIB Address Knob Volume LCD Brightness STORE Menu Store Menu Configuration Name Help Line RECALL Menu Recall Menu Configuration Name Help Line 284 AUX 1 Menu Pulsewidth Delay Ch A Pulsewidth Ch A Delay Ch B Pulsewidth Ch B Delay Ch C Pulsewidth Ch C Delay Ch D Pulsewidth Ch D Delay Gyr 36 MAINTENANCE The Model 555 pulse generator has no user serviceable parts For repair contact your dis tributor 37 38 CUSTOM FEATURES 35 Volt Option For units with the optional 35 volt output additional BNC connectors are provided on the rear panel The 35 volt output can be enabled independently for each of the channels from the channel output mode menu When enabled the rear panel outputs will provide an adjustable output from 2 volts to 38 volts an
12. d the timing will be calibrated to all other channels The front panel output will be in the TTL CMOS mode The 35 volt output provides a fast controlled rising edge However pulsewidth and falling edge are not tightly controlled The front output remains calibrated The pulsewidth can be set over the standard range of the unit to allow full use of the front panel outputs but the 35 volt output will self limit to approximately 4 ns with some droop To maintain the highest possible rise time care must be taken with cabling and termination Low capacitance cable and 50 ohm termination will provide the fastest rise times without overshoot Faster rise times can be achieved by increasing the termination resistance but some overshoot is likely to occur Std Comments New Keyword Parameter TTL Selects output mode TTL CMOS Adjustable or MODe ADJustable 35 v NeW 35 volt Sets Adjustable output level Note that 35 V option AMPLitude lt numeric value gt New AMPLitude can only be set when channel is in 35 V mode 35 Volt Specifications 35 volts 1 ns unless otherwise specified Output into 50 ohms 2 35 volts Risetime lt 10 ns e Falltime 100 ns nominal Pulsewidth Accuracy 200 ns nominal e Delay Offset Error lt 10 ns Delay Jitter 2 ns Pulsewidth 1 4 ns width can be set longer with significant droop Pulse Period single shot 001 s 1 KHz 39 40
13. dth to 25 ms sets delay to O sets system mode to single shot sets trigger level to 2 5v set to trigger on rising edge To arm the instrument use either of the following commands PULSEO STATE ON cr lt f gt INST STATE ON cr lt If gt arms the instrument alternate form A software generated external trigger can be generated by using the following command TRG cr lt f gt generates a software external trigger 25 Model 555 SCPI Command Summary Keyword Parameter Std New Comments INSTrument Std Subsystem Supports treating each channel as a logical instrument CATalog Std Query only Returns a comma separated list of the names of all channels A two channel instrument would return To ChA ChB FULL Std Query only Returns a comma separated list of the names of all channels and their associated number A two channel instrument would return To 0 ChA 1 ChB 2 NSELect numeric value Std Selects a channel using the channel s numeric value All channel specific commands will refer to the selected channel SELect identifier Std Selects a channel using the channel s identifier string All subsequent channel specific commands will refer to the selected channel STATE lt boolean value gt Std Enables Disables the selected channel output If To is selected all outp
14. e 21 IEEE 488 2 Common Command Format sesse sees sees sees esse es ee ee ee ee ee ee ee ee ee ee ee ee ee ee 21 SCPI Command Keywords se ee ee ee ee ee ee ee ee ee ee 22 SCPI Command and Query Format eee se ee ee ee ee ee ee ee ee ee 22 SCPI Keyword Separator e eee eere eee eee eee eee eee ee eee eee ee eee eee eee eee eee eee eee eee ee eee eese eese 23 SCPI Option Keyword ecce ee eee eene ee eene ee eene eee eee eee esee esee ee eese eese eese sese seats e eese eese 23 SCPI Specific and Implied Channel se ee ee eee eee eee eee eene eene eee eee sees esee esee eee 23 SCPI Parameter Types CT 23 osque 23 INTERFACE EXAMPLES se ee tete egeat E PEE UE Fiet Ee oneness 25 SPECIFICATIONS es teque ecke Y GO 31 Internal Rate Generator aan E REESE Ge EG ee sek Y iD ee 31 Channel Timing Parameters ee es ees seg dee ere sees deed see SS Feo ER Gede Rg ee ses Ense 31 Output Channel Parameters sissies eer terere toe sege es ees oe eie vr ee gees oe ese se eo ee ge Reg en 31 External Trigger and Gate nassen Ee ed ER Gede nin VOIR FN ee Ge sen 31 Computer Interface 4 sesde Re A A 32 Generali es iia 32 MENU SUMMARY ses 33 MAINTENANER sa tenten dee 37 CUSTOM FEATURES Sa GN iei pH e tie ERES ee ee eas 35 Volt Option 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 1v
15. e Decimal Mark GPIB Address Knob Volume LCD Brightness Computer Communication Parameters BAUD RATE ECHO GPIB ADDRESS NOTE The unit will not respond to computer commands unless the appro or not priate BAUD rate or GPIB address is selected 14 Selects the baud rate for the RS232 interface Selects whether to echo characters back to the host computer Selects the GPIB address Keypad Controls KEY REPEAT RATE Sets the rate at which the keys will repeat when held down This is most useful when using the Up Down arrows to change parameters KEY VOLUME Sets the key click volume KNOB VOLUME Sets the parameter adjustment knob click volume NOTE The key repeat rate is fairly accurate better than one millisecond and may be used to increase decrease a parameter at a set rate Miscellaneous AUTO Auto run startup function allows unit to automatically gener ate pulses after startup is complete e DECIMAL MARK Selects a dot or a comma for the decimal point LCD BRIGHTNESS Sets the LCD brightness NOTE The decimal point may be replaced with a comma for display pur poses but the computer command interface always uses a decimal point STORE Menu STORE Menu Store Menu Configuration Name Help Line Storing a Configuration Use the following procedure to store a complete system configuration To enter the Store Menu press the store b
16. e unit is actively generating pulses or armed and waiting for an external trigger Musical Note Indicates the function key has been pressed The upper right side of the display contains the title of the currently displayed menu The rest of the display is used for system parameters The display brightness may be adjusted allowing the instrument to be used under various lighting conditions Keypads Three keypad areas provide fast access to various menus and easy editing of system param eters Channel Keypad Provides one touch access to the menus for setting up the channel parameters Pressing the appropriate letter will dis play the parameters for the corresponding channel Arrow Keypad The up down arrows are used to increment decrement the current parameter indicated by the blinking cursor The po sition of the cursor controls the step size for each increment The right left arrow moves the cursor to different positions within the current parameter The NEXT key selects the next parameter in the currently displayed menu The blue Function key allows the keys to select the blue function Numeric Keypad Allows numbers and alphanumeric values to be entered When entering alphanumeric values pressing a key will dis play the first letter shown on the keypad Repeated key presses will toggle through all the letters both upper and lower case shown on the keycap 5 To enter two letters which appear on the same keycap select t
17. he first character then use the right arrow to shift to the next position and enter the next letter When data entry is com plete the ENTER key must be pressed Parameter Adjustment Knob An alternate to the Arrow Keypad the Parameter Adjustment Knob may be used to adjust the current parameter The step size is controlled by the position of the cursor however turning the knob faster will increase the step size Pushing the knob will perform functions similar to the NEXT key and switch to the next parameter in the currently displayed menu Basic Operation Overview o Internal System Timer Internal and System Mode Generator RUN Command External Input Channel Timers and Channel Mode Generators Start sourceis RUN button in Internal Modes External input in External Trigger modes Channels are armed by the RUN button In single shot and burst modes channels may be rearmed by pressing the RUN button The Model 555 Pulse Generator is designed to provide maximum flexibility while maintaining a Output ulses simple interface A basic understanding of the architecture of the instrument will aid in fully exploiting its capabilities Referring to the figure above the timing generator is divided into two sections the Internal System Timer amp Mode Generator and the Channel Timer amp Mode Generator The Channel Timer functions as a non retriggerable delayed one shot pulse generator This means that
18. he use of the channel gate function NORMal Sets the polarity of the gate signal NORMal output F is active when gate signal is high COMPlement and POLarity COMPlement New 2 5 INVerted INVerted are aliases For both the output is active when gate signal is low 28 Model 555 SCPI Command Summary Keyword Parameter Sta Comments New Subsystem Contains commands to control the DISPlay Sta 7 display i Controls intensity of display Range is O to 1 where BRIGhtness lt numeric value gt Std e Re 2 O is off and 1 is full intensity UPDate Ouery New Ouery only Forces update of display Keyword Parameter Stal Comments New SYSTem Std Query only Returns the state of the machine returns ACTIVE if the machine is armed and or generating pulses or IDLE if the machine has been STATE Query New disarmed followed by a counter of the number of bursts generated by the machine The counter ranges from 0 99 and rolls back to 0 after the 99th burst group has been completed BEEPer St Subsystem Controls the audible beeper STATe lt boolean value gt St Enables disables the beeper VORE riales st Sets the volume of the beeper Range is 0 to 1 where 0 is off and 1 is maximum volume COMMunicate St Subsystem Controls the RS232 and GPIB interfaces Subsystem Cont
19. ibration Unauthorized modification or misuse Operation outside of the published environmental specifications for the product Improper site preparation or maintenance a UE Berkeley Nucleonics does not warrant the operation of this product to be uninterrupted or error free This product is not intended for medical or life support use for the detonation of explosive devices or for any other application that could cause bodily harm in the event of a product malfunction The user assumes all risks associated with such use of this product Safety Issues Normal use of test equipment presents a certain amount of danger from electrical shock be cause testing must be performed where exposed voltage is present An electrical shock causing 10 milliamps of current to pass through the heart will stop most human heartbeats Voltage as low as 35 VDC or RMS AC should be considered dangerous and hazardous since it can produce a lethal current under certain conditions Higher voltages pose an even greater threat because such voltage can easily produce a lethal current Your normal work habits should include all accepted practices that will prevent contact with exposed high voltage and steer current away from your heart in case of accidental contact with a high voltage You will signifi cantly reduce the risk factor if you know and observe the following safety precautions 1 To avoid the risk of electric shock do not remove the instrument cover Se
20. ng Parameters Pulse Configuration Special Functions Gated Operation Enable Enable Enable Enable Polarity Pulsewidth Output Type Mode Gate Enable Delay Output Level a Enable Disable The top of each Channel menu page is a parameter to enable or disable the output of the channel This affects only the output of the current channel Timing Parameters PULSEWIDTH Sets the width of the active portion of the pulse DELAY Sets the delay from the internal To or external trigger to the start of the pulse NOTE The pulsewidth delay 250 ns hardware reset constant must be less than the To period Therefore if the sum exceeds To period the correct pulses will be generated but at a rate slower than the To rate Pulse Configuration POLARITY Sets the pulse to active high or active low OUTPUT TYPE Selects between the high speed TTL CMOS compatible out put or the slower adjustable output e OUTPUT LEVEL Sets the voltage level when the adjustable output is selected NOTE The unit does not generate negative output voltages An active high TTL CMOS pulse is Ov 5v Ov An active low pulse is 5v Ov 5v The adjustable output has a slower rise fall time than the TTL CMOS output and should be used only when the adjustable voltage or the extra current is needed 11 Special Functions e MODE BURST DIVIDE BY N Gated Operation MODE Menu MODE Menus To Mode To Mode To Mode To Mode Oscillator MODE Continuous MO
21. nnsnnnnne LL Timing Parameters ees sees see tees ene eaa ees 88 eg ee see ee Wees S aede ea aa oe se oae EG ee ee age Ll Pulse Configuration esse sees sees sees ese ee ee eee eene eene eene ee ee sese so sese se sese sese sese ee ee ee ee ees D Special Functions AS Ee Ee SE Be eo Ee GN ee De EE be Ee N ee bee Ge YDD ee be ee eg ee L2 Gated Operation ERE p MODE Mens KG E De eie D Modes RE EE EE N AE p RATE MENU rrr rc LI To Period EEUU S GATE TRIGGER Mein ies des stede ese ees ee des io oleo ee PX QE SERIA n Ceo ERR obo LO Gate Trigger Mode eerte serene Serve e voee A LG jr SYSTEM Men eR CN 14 Computer Communication Parameters sssssssssses sesse ee ee ee ee ee ee ee ee ee 14 Keypad Controls NE ERR 15 Miscellaneous ASAS sn ennunenssnen a essen esse 15 STORE MENU pou P S 15 Storing a Configuration ecce eene eee eee eee eene eene eee eese eese eese eee eee eee eese eese eese e eese sees esee 15 Configuration Rm 16 hue IEEE 16 OOIE MERE ER AO o Y Y e 16 Recalling a Configuration ocococoncnonononononononononononononononononononoconononononononoconocononoconocononononos 16 COMP SUPA ON H TED RR 16 IN RR RE RE SE EE RP EE N ET Re DH 16 AUXTLIARY le SR EE EE T 17 BASIC OPERATION ierse sa 18 COMPUTER INTERFACE Se Poeni Feo sl 21 Serial Port PInQU E aa nennen se eek YT Ge Y ee 21 Programming Command Types and Format Gee ee ee ee EE Ge e
22. rator Standard modes include Continuous once started To pulses are generated continuously Single Shot one To pulse is generated for each start command Burst Mode n To pulses are generated for each start command Duty Cycle once started To pulses cycle on and off continuously The To pulses are distributed to all of the start inputs of the Channel Timer and Mode Genera tors QuickStart The default mode channel mode normal system mode continuous and external trigger disabled of the Model 555 generates a continuous stream of pulses when started by the RUN key The output status is given in the upper left corner of the display A blinking light indicates pulses are being produced To generate a specific pulse train in the default mode Enter the output channel menu by pressing the appropriate letter key Set the desired pulsewidth and delay Repeat for each output _ Enter the RATE menu by pressing the FUNCTION key and then the 4 key Set the desired pulse period Note that in general the pulse delay plus pulsewidth should be less than the period Press the RUN key Selecting Menus Parameters are grouped in menus selectable using the function keys To select the output channel parameters press the letter key corresponding to the desired channel To select blue menus press the FUNCTION key and then the key corresponding to the desired blue function Menus may include a number of different pages Each page contains up to fo
23. rols the physical configuration of SIE St the GPIB port ADDRess numeric valles St Sets the GPIB address of the instrument lt numeric value gt 8 Subsystem Controls the physical configuration of rl 2 the RS232 port Sed Sets the baud rate for both receiving and transmitting BAUD St using the RS232 port Valid rates are 4800 9600 192007 19200 and 38400 38400 Enables Disables transmission of characters received ECHO lt boolean value gt New by the RS232 port KLOCk lt boolean value gt New Locks the keypad AUTorun BIED v lues New After power up unit will start generating pulses automatically VERSion Std Query only Returns SCPI version number in the form YYYY V ex 1999 0 29 IEEE 488 2 Common Commands Mnemonic Command Name Parameters Comments Queries the Pulse Generator Identification The ID IDN Identification Query will be in the following format model option version Restores the state of the Pulse Generator from a RCL Recall Command numeric value copy stored in local nonvolatile memory 0 through 10 are valid memory blocks RST Reset Command Resets the Pulse Generator to the default state Stores the current state of the Pulse Generator in SAV Save Command numeric value local nonvolatile memory 1 through 10 are valid memory blocks TRG Ti Generates a software trigger pulse Operation is the same as receiving an e
24. rvic ing of the instrument should only be performed by trained qualified personnel 2 Do not position the instrument in such a manner that makes it difficult to remove the AC power cord 3 Use an insulated floor material or a large insulated floor mat to stand on and an insulated work surface on which to place equipment Make certain such surfaces are not damp or wet 4 Use the time proven one hand in the pocket technique while handling an instrument probe Be particularly careful to avoid contact with metal objects that could provide a good ground return path 5 When testing AC powered equipment remember that AC line voltage is usually present on power input circuits such as the on off switch fuses power trans former etc Never work alone Someone should always be nearby to render aid if neces sary Training in CPR first aid is highly recommended Safety symbols used on the instrument Instruction Manual symbol user must refer to the instruction manual On Standby switch symbols or led Standby Eu b CONTROLS amp CONNECTORS Front Panel Display Layout and Indicators A 4 line x 20 character vacuum fluorescent display module displays parameters and status information The status information is located in the upper left corner of the display between the two brackets There are three enunciators Vertical Arrow Indicates there are additional pages to the current menu Blinking Light Indicates th
25. s been disarmed will generate a new pulse train Sets the number of pulses to be generated each on cycle when in the Duty Cycle mode Sets the number of pulses to skip each off cycle when in the Duty Cycle mode RATE Menu Rate Menu To Period To Period To Period PERIOD Sets the To period GATE TRIGGER Menu GATE TRIGGER Menu Gate Trigger Mode Gate Trigger Mode Gate Trigger Mode MODE Disabled MODE Triggered MODE Gated THRESHOLD THRESHOLD THRESHOLD EDGE POLARITY 13 Gate Trigger Mode MODE THRESHOLD EDGE POLARITY NOTE When the gate disables the System Timer the timer is reset The gate edge to enable the timer will restart the System Timer which synchronizes the To pulse to the gate and minimizes jitter relative to the gate The trigger threshold applies to all uses channel and system of the trigger gate input SYSTEM Menu Selects external input usage for controlling To disabled edge triggered or level gated Sets the voltage threshold for the external input This level is applied to all uses of the external input Selects rising or falling edge for the trigger mode Selects active high or active low in the gated mode SYSTEM Menus Comm Parameters Keypad Parameters Misc Parameters Baud Rate Key Repeat Rate Echo Enable Key Volum
26. t 1 No Connection Tx Transmit to computer Rx Receive from computer DTR connected to pin 6 Ground DSR connected to pin 4 RTS connected to pin 8 CTS connected to pin 7 Noconnection o 00 lo tA RR O io A standard straight through cable is used with most PCs Programming Command Types and Format The Model 555 Pulse Generators use two types of programming commands IEEE 488 2 Common Commands and Standard Commands for Programmable Instruments SCPI The format is the same for both the RS232 interface and the optional IEEE 488 interface Hyperterminal in Windows or any other generic terminal program may be used to interactively test the commands using the RS232 interface The format of each type is described in the following paragraphs IEEE 488 2 Common Command Format The IEEE 448 2 Common Commands control and manage generic system functions such as reset self test and identification Common commands always begin with the asterisk character and may include parameters The parameters are separated from the command pneumonic by a space character For Example RST lt cr gt lt lf gt RCL 1 lt cr gt lt lf gt IDN lt cr gt lt lf gt x24 SCPI Command Keywords The commands are shown as a mixture of upper and lower case letters The upper case letters indicate the abbreviated spelling for the command You may send either the abbreviated version or the entire keyword Upper and or lower case
27. t is in process will stop the output After the burst has been completed pressing the RUN STOP button will gener ate another burst Duty Cycle RUN STOP button starts a continuous pulse stream which oscillates for the n pulses and off for m pulses where n and m are specified by the ON and OFF parameters re spectively The rate is specified in the RATE menu Operation Modes w External Trigger Continuous RUN STOP button arms unit The first trigger received starts continuous pulse stream at the rate specified by the RATE menu Additional triggers are ignored Pressing the RUN STOP button a second time will stop and disarm the instru ment 19 Single Shot Burst Duty Cycle RUN STOP button arms unit Generates a pulse for every external trigger received Press the RUN STOP button a second time to disarm the instrument This corresponds to the normal externally triggered mode for most pulse genera tors RUN STOP button arms unit Generates a stream of n pulses where n is specified by the Burst parameter for every external trigger received The rate is specified in the RATE menu RUN STOP button arms unit The first trigger starts a con tinuous pulse stream which oscillates on for n pulses and off for m pulses where n and m are specified by the ON and OFF parameters respectively The rate is specified in the RATE menu Additional triggers are ignored 20 COMPUTER INTERFACE Serial Port Pinou
28. ur parameters The status block in the upper left corner of the display shows a vertical arrow if the current menu contains additional pages To select the next page select the same menu button again pressing the FUNCTION key and blue function again for higher order menus Selecting Menu Items Within a menu the blinking cursor indicates the current menu item for editing The NEXT key or pressing the adjustment knob will select a different menu item Numeric Input Mode When the current item is numeric the system enters the Numeric Input Mode In this mode data may be edited in one of three ways Using the arrow keypad the Left and Right arrow keys are used to select a digit to edit The selected digit blinks to identify itself as the active digit The Up and Down arrow keys are then used to increment or decrement this digit Alter nately after using the Left and Right arrow keys to select an active digit the adjustment knob may be used to increment and decrement this digit The adjustment knob features speed dependent resolution Slow rotation will increment or decrement the active digit by one As you increase the speed of rotation the parameter will be 10 to 1000 times faster depending on the speed The last entry mode is using the numeric keypad Enter the number including decimal point using the numeric keypad When complete enter the number using the ENTER key Errors may be corrected using the backspace key or to start over press the
29. ut is affected Enabling To is the same as pressing the RUN button 26 Model 555 SCPI Command Summary Std Keyword Parameter Comments New Subsystem Contains commands to control the PULSe 0 Sid output pulse generation Commands without suffix refer to the currently selected logical instrument See INSTrument subsystem Enables Disables the output for all channels dd Ran values Std Command is the same as pressing the RUN button BCOunter rente values New Burst Counter Number of pulses to generate in the Burst mode PCOunter Loue vhs New Pulse Counter Number of pulses to generate during on cycle of the Duty Cycle mode OCOunter DEd New Off Counter Number of pulses to inhibit output during the off cycle of the Duty Cycle mode OSCillator INTernal EXTemal New Selects the To oscillator source Internal 80 MHz or external 10 MHz EXTernal New Subsystem Contains the commands to define the system use of the external input Sets the trigger threshold Value is in volts with a LEVel emmers vals New fange of 200 300 volts Note This command is an alias to GATE AMPLitude both adjust the threshold for the external input ar Model 555 SCPI Command Summary Keyword Parameter red Comments ew Subsystem Contains commands to control the outp
30. ut pulse generation Valid suffix range depends PULSe 1 2 n St on the number of channels CHA 1 ChB 2 etc Command without suffix refers to the currently selected logical instrument See INSTrument subsystem STATE boolean values st Enables Disables the output pulse for selected channel WIDTh lt numeric value gt St Sets the width or duration of the output pulse DELay mare Valus St Sets the time from the start of the To period to the first edge of the pulse Sets the polarity of the pulse For NORMal NORMal operation the second nominal state is more positive POLarity COMPlement Std than the first COMPlement and INVerted are INVerted aliases For both the second state is more negative than the first OUTPut New Subsystem Contains command to control output mode TTL Selects output mode TTL CMOS Adjustable or 35 MODE ADJustable 35 V NEW vor AMPLitude lt numeric value gt New Sets Adjustable output level NORMal SINGle CMODe BURSt New Channel Mode Sets the channel output mode DIVide RM Burst Counter Sets the number of pulses to Om sumene values New generate when channel is in the BURST mode Divide Counter Sets the number of pulses to DCOunter lt numeric value gt New generate when the channel is in the divide by n mode Channel Gate Subsystem Contains commands to CGATE New control using the gate input to control the output channel STATe lt boolean value gt New Enables disables t
31. utton function store Set all parameters to the desired value Select a configuration number NOTE The number of storage locations is model dependent see the speci fications for your model You cannot store to the zero location as that contains the factory default values 15 e Label the configuration as desired Press enter key to save label From the Store menu press the store button function store Configuration Specifies the location to store the current system configuration Numbers range from 1 to n where n is the number of stored configuration Name Prior to storing the system configuration a label may be added to help identify the configuration later Enter a new label using the alphanumeric keypad RECALL Menu RECALL Menu Recall Menu Configuration Name Help Line Recalling a Configuration Use the following procedure to recall a stored or default system configuration To enter the Recall Menu press the recall button function recall Select a configuration number Note that configuration O is the factory default setting From the Recall Menu press the recall button function recall Configuration Specifies the location of the system configuration Numbers range from 0 to n where n is the number of stored configuration Zero is the factory default values Name A label may be added to help identify the configuration This is a
32. xtemal trigger pulse 30 SPECIFICATIONS Internal Rate Generator Trigger Modes Rate Resolution Accuracy Jitter Burst Range On Off Cycle Range Single shot continuous burst duty cycle 1 s 99 99999999 s 01 Hz to 1 Mhz 100 ns 1 ns 0001 x period ns RMS 50 000 pulses 50 000 pulses Channel Timing Parameters Delay Pulsewidth Resolution Accuracy Timebase Jitter 0 99 999999999s 2 amp 4 Channel Units 0 20 s 8 Channel Unit channels 1 amp 2 0 13 s 8 Channel Unit channel 3 0 1 6 s SChannel Unit channels 4 8 10 ns 99 999999999 s 2 amp 4 Channel Units 10 ns 20s 8 Channel Unit channels 1 amp 2 10 ns 13 s 8 Channel Unit channel 3 10 ns 1 6 s 8 Channel Unit channels 4 8 Ins 2 ns 0001 x delay 80 MHz ns RMS Output Channel Parameters Impedance Output Slew Rate Channel Modes Burst Range Divide by n Range 50 ohm TTL CMOS Adjustable 2 00 V 12 V into high impedance load Independently adjustable for each channel gt I V ns TTL CMOS Mode gt 1 V ns Adjustable Mode Single shot normal burst divide by n 50 000 pulses 50 000 312 External Trigger and Gate Computer Interface General Rate DC 1 MHz Threshold 100 mV 12V Insertion Delay 250 ns Jitter 15 ns RMS Trigger Slope Rising or falling edge Gate Active low or active high Impedance 1000 ohm RS232 4800 9600 19200
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