Manual - Berkeley Nucleonics Corporation
Contents
1. ii 24 To Use Channel Burst Mode Function iii 25 To Use Channel Duty Cycle Function i 25 To Use the Channel Gating Function i 25 External Input Overview ann ih 25 To Generate a Pulse on Every Trigger INput 26 To Generate a Burst of Pulses on Every Trigger Input 26 To Start a Continuous Stream of Pulses Using the External Trigger 26 To use the External Gate to Control the System sesse ees ee ee ee 27 6 Programming the 505 cccccsscsccsccscsscsccscescsccsceses LI Talking to the Pulse Generator Re ee Re ee RE Re 30 RS232 Interface Overview as sesse nn nn 30 GPIB Interface Overview cccccccccccccccccccescescessssssesscsscssscnceccsscssscsscesessesses 30 Programming Command Types and Format ennen 31 IEEE 448 2 Common Command Format eeens 31 SCPI Command Keywords iii 31 SCPL Command Formation e apri 31 SCPL Query Formada Ge ee GE Re 31 SCPI Keyword Separar aka 32 SGPIOptonal Keywords nu 32 SCPI Specific and Implied Channel nneneeeenennennenenen 32 SCPIParati ler ire SR ie N tee eenderde oe 32 Error Code Rte A 33 Programming Example ara a 33 505 SCPI Command Summary ii 34 505 SCPI Command Summary ii 35 505 SCPI Command Summary conncnccccnononnnaannnonnnonnananonoccnoonannnn2. To T1 T2 Selects the Sync source Sets the polarity of the pulse For NORMal NORMal operation the second nominal state is more COMPlement positive than the first COMPlement and IN Verted IN Verted are aliases For both the second state is more negative than the first OUTPut New Subsystem Contains command to control output mode AMPLitude lt numeric value gt New Sets Adjustable output level NORM al SINGle BURSt DCYCLE BCOunt amp i lue gt IN Burst Counter Sets the number of pulses to ad EER EN generate when channel is in the BURST mode Pulse Counter Sets the number of pulses to PCOunter lt numeric value gt New generate during the on cycle of the Duty Cycle Mode y 5 Off Counter Number of pulses to inhibit output Sets the number of To pulses to delay until Channel Mode Sets the channel output mode WCOunter lt numeric value gt New n enabling output DISABLE Channel Gate Subsystem Contains commands CGATe LOW New to control using the gate input to control the HIGH output channel 38 505 SCPI Command Summary Sn ST Query only Returns the state of the machine STATE New returns ACTIVE if the machine is armed and or generating pulses or IDLE if the machine has been disarmed BEEPer Is Subsystem Controls the audible beeper lt boolean value gt Enables disables the beeper Sets the volume of the beeper Range is O to 100 where O is off and 1
3. lt numeric value gt NORMal SINGle BURSt DCYCle Sets the To mode Burst Counter Number of pulses to generate in the Burst mode Pulse Counter Number of pulses to lt numeric value gt generate during ON cycle of the Duty Cycle mode BCO unter lt numeric value gt Off Counter Number of pulses to inhibit output during the OFF cycle of the Duty Cycle mode OCO unter lt numeric value gt Subsystem Contains the commands to define the system use of the external input DISabled TRIGger GATe Selects the trigger mode Sets the trigger threshold Value is in volts nuns vales with a range of 20 to 15 00V RISing FALLing Selects which edge rising or falling to use as the trigger signal Sets the polairty of the gate signal HIGH output is active when gate signal is high LOW output is active when gate signal is low 505 SCPI Command Summary Std Keyword Parameter New Comments Subsystem Contains commands to control the output pulse generation Valid suffix range depends on the number of channels CHA 1 ChB 2 etc Command without suffix refers to the currently selected logical instrument See INS Trument subsystem PULSe 1 2 n Std Enables Disables the output pulse for selected lt boolean value gt Std channel lt numeric value gt Std Sets the width or duration of the output pulse Sets the time from the start of the To period to
4. 0023 lt cr gt lt If gt PULSEO MODE NORM lt cr gt lt If gt PULSEO PER 0 1 lt cr gt lt If gt PULSEO EXT MODE DIS lt cr gt 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 disables the external trigger To start the pulses use either of the following commands PULSEO STATE ON lt cr gt lt If gt INSTSTATE ON lt cr gt lt lf gt starts the pulses alternate form to start pulses Example 2 25 ms pulsewidth O delay external trigger one pulse for every trigger PULSE1 STATE ON lt cr gt lt If gt PULSE1 POL NORM lt cr gt lt If gt PULSE WIDT 0 000025 lt cr gt lt If gt PULSE1 DELAY 0 lt cr gt lt lf gt PULSEO MODE SING lt cr gt lt If gt PULSEXTLEV 2 5 lt cr gt lt lf gt PULS EXT EDGE RIS lt cr gt lt If gt enables channel A sets polarity to active high sets pulsewidth to 25 MS sets delay to 0 sets system mode to single shot sets trigger level to 2 5V set to trigger on rising edge 35 To arm the instrument use either ofthe following commands PULSEO STATE ON lt cr gt lt lf gt arms the instrument INST STATE ON lt cr gt lt lf gt alternate form A software generated external trigger can be generated by using the following command TRG lt cr gt lt If gt generates a software external trigger 505 SCPI Command Summary Std Keyword Par
5. Select the Duty Cycle mode On Cycle Set the number of pulses to produce during the ON cycle Off Cycle Setthe number of pulses to skip during the OFF cycle Note Older QC pulse generators had a divide by n function The duty cycle mode is a more general case To reproduce the divide by n function set the on cycle to 1 and set the off cycle to n 1 where n is the divide by n factor To Use the Channel Gating Function Each channel may use the external input to gate or control its output The gate controls the triggering of the channel Once a channel has started to produce a pulse it will complete the pulse even if the gate has been removed no partial pulses will be produced To use the gate setthe following parameters within the TRIG GATE menu Level Set the threshold voltage for the external input within the CHANNEL menu Gate Select active high or active low External Input Overview The external input may be used to trigger the unit or to gate the system or chan nel timers When used as a trigger input the external input acts as a system start pulse Depending on the system mode the result of a trigger input can be either a single pulse a burst of pulses or the start of a stream of pulses 27 To Generate a Pulse on Every Trigger Input To generate a pulse on every external trigger received set the following param eters within the Mode menu Mode Select the Single Shot mode within t
6. low or active high 12 Configuration The configuration specifies the location to store the current system configura tion Numbers range from 1 to n where n is the number of stored configura tions NOTE The number of storage locations is model dependent see the specifi cations for your model You cannot store to the zero location as that contains the factory default values e From the Store menu press the setup button function setup Storing a Configuration Use the following procedure to store a complete system configuration e Set all parameters to the desired value e Selecta configuration number Recalling System Configurations Use the following procedure to recall a stored or default system configuration e Selecta configuration number e From the Recall Menu press the recall button function recall Note Configuration 0 is the factory default setting Period 0 001s 1kHz Mode Continuous Trigger Disabled Pulsewidth 0 0002 Delay 0 0 Mode Normal Setting System Mode of Operation e MODE Selects the T mode Continuous Single Shot Burst or Duty Cycle mode e BURST Sets the number of pulses to be generated when in the Burst mode e DCON Sets the number of pulses to be generated for each ON cycle e DC OFF Sets the number of pulses to skip for each OFF cycle when in the Duty Cycle mode NOTE Any mode may be started by either the RUN key in the internal trigger m
7. of rotation the parameter will be 10 to 1000 times faster depending on the speed Entering Numeric Parameters 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 adjustement knob enables the item and the Down arrow CCW adjustment knob disables the item Selecting Menu Parameters Menus include all the parameters for setting up the pulse generator To selecta parameter within the current menu press the NEXT key Pressing the rotary adjustment knob is equivalent to pressing the NEXT key and will also select the next parameter Enable Disable Pulse Output Within the CHANNEL menu page to enable or disable the output of an individual timer e Channel Enables or disables the pulse output for the current channel Setting Pulse Sync Source Within the CHANNEL menu to set the starting point for the pulse delay param eter e Sync Set the sync source for the channel which may be T or any of the other channels The unit will not allow a chan nel to trigger itself Setting Pulse Gate Control e Gate 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 ensure that all uses of the trigger are compatible To enable the gate set the gate to active
8. 00 is maximum volume COMMunicate ES Subsystem Controls the RS232 and GPIB interfaces lt numeric value gt Std Subsystem Controls the physical configuration of the GPIB port lt numeric value gt Sets the GPIB of the instrument The first ADDRess parameter is the primary address SERial Subsystem Controls the physical configuration of the RS232 port 4800 9600 19200 38400 Enables Disables transmission of characters ECHO received by the RS232 port After power up unit will start generating pulses AUTorun lt boolean value gt New P A P Sp automatically Query only Returns SCPI version number in the form YYYY V ex 1999 0 Sets the baud rate for both receiving and transmitting using the RS232 port Valid rates are 4800 9600 19200 and 38400 BAUD VERS ion Std Keyword Parameter Li Comments i Subsystem Contains commands to control Query only Forces update of display UPDATE 39 IEEE 488 2 Common Commands Mnemonic IDN RCL RST SAV TRG 40 Command Name Identification Query Recall Command Reset Command state Save Command Parameters Comments Queries the Pulse Generator Identification The ID will be in the following format model option version Restores the state of the Pulse Generator from a copy stored in local nonvolatile memory 0 through 10 are valid memory blocks lt numeric value
9. BNC 505 Pulse Generator Operating Manual Berkeley Nucleonics Corporation 2955 Kerner Blvd San Rafael CA 94901 5418 415 453 9955 phone 415 453 9956 fax www berkeleynucleonics com May 2005 Contents 1 Introducti il Technical SUpport ee ee GE ee ee ee De ee Alena 2 WW ATE ALLY air ee oi De es 2 Pack APC DORA AS AI A os 2 Safety A II O ge 3 2 Front Panel Overview cccsccscssssscscsscescscescescescscs D 905 Front Panels asia lillo dti 6 Display Layeoit and Indicators A A dee Hows iA Nn 6 KEDAR is 6 3 Pulse Concepts amp Pulse Generator Operation 9 Counter Architecture Overview na E E A 10 System Timer Punch isa 10 Channel Timer Functions amenderen Gute dialisi 11 Dependent amp Independent Timing Events iii 11 selectie Mensili ATA EA A A ee ees 11 Numerie Input Mode iii 12 Entente Numeric Parameters na Rus 12 Selecting Menu Parameters alia ana 12 Enable Disable Pulse Ondina 12 Setting Puls Sync Source alal EA 12 Setting Pulse Gate Controla EE obiit RE ns 12 Conno ration sten EO OE A A A nn 13 Storing a Configuration iii 13 Recalling System Configurations uaar 13 Setting System Mode of Operation iii 13 Enabling External Gate Control sesse ss esse rien 13 Power On Configuration lai 14 Setting Auto Start Mode AA A AA ee 14 Setting System Serial Port Baud Rate iii 14 Setting Communication GPIB Addr
10. Set the period between pulses 28 within the TRIG GATE menu EXTin Select Triggered mode Level Set the trigger threshold level Edge Select which edge rising or falling to trigger on Pressing the RUN key will arm the unit Once the unit is armed it will begin generating pulses after an external trigger is received Triggers that occur after the pulses start are ignored Pressing the STOP key will disarm the unit To use the External Gate to Control the System The external trigger may be used to control the output of the unit To gate the system timer set the following parameters within the MODE menu Mode Select the desired mode Period Set the period between pulses within the TRIG GATE menu EXTin Select Gated mode Level Set the gate threshold level Gate Select active high or active low Pressing the RUN key will arm the unit Once the unit is armed it will begin generating pulses whenever the external trigger input is in the active state When the gate is in the active state the system timer is reset Pulses that have already started when the gate enters the inactive state will continue until the pulse is complete Pressing the STOP key will disarm the unit 29 30 Programming the 505 31 Programming the 505 Talking to the Pulse Generator The 505 comes standard with an RS232 serial interface and an optional GPIB interface All menu settings can be set and retrieved over the computer interface usin
11. ameter New Comments INST nt Std Subsystem Supports treating each channel as a logical instrument Query only Returns a comma separated list CATalog Std of the names of all channels A two channel instrument would return To T1 T2 Query only Returns a comma separated list of the names of all channels and their FULL F a Std associated number A two channel instrument would return To O T1 1 T2 2 COMMands New Query only Returns an indentured list of all SCPI commands en vic Selects a channel using the channel s numeric INSELect Std value All channel specific commands will value gt refer to the selected channel Selects a channel using the channel s identifier SELect lt identifier gt Std string All subsequent channel specific commands will refer to the selected channel Enables Disables the selected channel output f lt boolean If To is selected all output is affected A value gt Std Enabling To is the same as pressing the RUN button 36 505 SCPI Command Summary Std Keyword Parameter Nas Comments Subsystem Contains commands to control the output pulse generation Commands without suffix refer to the currently selected logical instrument See INSTrument subsystem PULSe 0 Enables Disables the output for all channels Command is the same as pressing the RUN or STOP button Sets the To period lt boolean value gt PERiod lt numeric
12. ate a stream of n pulses at a rate speci fied by the period parameter To Use Duty Cycle Mode To generate a stream of pulses which oscillates on for n pulses and off for m pulses within the MODE menu set the following parameters Mode Select Duty Cycle for the system mode DC On Selectthe number of on pulses DC Off Select the number of off pulses Period Select the desired period Pressing the RUN key will now generate a stream of pulses which oscillates on for n pulses and off for m pulses ata rate specified by the period parameter Channel Timer Overview The output of each channel is controlled by two timers to generate the delay timing and the pulsewidth All channels are simultaneously triggered depending on the system mode by either the internal T pulse the external trigger or a trigger provided by the cpu A given channel may or may not generate a pulse depending on its own channel mode as described below To Use Normal Mode Function The Normal mode generates a continuous stream of pulses at a rate determined by the system timer within the CHANNEL menu set the following parameters Channel Select Enable to enable channel output Delay Set the desired delay Width Set the desired pulsewidth Mode Select the Normal mode Pressing the RUN key will now generate a continuous stream of pulses To Use Channel Single Shot Function The Single Shot mode generates a single pulse
13. c 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 lt numeric value gt Accepts all commonly used decimal representation of numbers including optional signs decimal points and scientific notation 123 123e2 123 1 23e2 123 1 23e 2 1 2300E 01 34 lt boolean value gt Represents a single binary condition that is either true or false True is represented by a 1 or ON false is rep resented by a 0 or OFF Queries return 1 or 0 lt identifier gt Error Codes Selects from a finite number of predefined strings The unit responds to all commands with either OK lt cr gt lt lf gt or n lt cr gt lt lf gt Where n is one of the following error codes Missing command keyword Invalid command keyword Missing parameter Invalid parameter NOOR ON Programming Examples Incorrect prefix i e no colon or to start command Query only command needs a question mark Invalid query command does not have a query form Example 1 20 ms pulsewidth 2 3 ms delay 10 Hz internal continuous opera tion PULSE1 STATE ON lt cr gt lt If gt PULSE1 POL NORM lt cr gt lt lf gt PULSE WIDT 0 020 lt cr gt lt lf gt PULSE1 DELAY 0
14. d 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 para graphs IEEE 488 2 Common Command Format The IEEE 488 2 Common Commands control and manage generic system functions such as reset self test configuration storage and identification Com mon 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 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 characters are acceptable For example If the command keyword is given as POLarity then POL and POLARITY are both acceptable forms truncated forms such as POLAR will generate an error polar ity pol and PolAriTy are all acceptable as the pulse generator is not case sensi tive SCPI Command Format SCPI commands control and set instrument specific functions such as the pulsewidth delay and period SCPI commands have a hierarchical structure composed of functional elements that include a header or keywords sepa
15. enu Enabling System Trigger or Gate Enables the use of the trigger input by the system timer as a trigger source ora gate source within the TRIG menu EXTin Selects between disabling the use of the trigger and setting the system trigger mode to trigger or gate mode e Level Sets the trigger threshold e Gate Selects between active high and active low when the gate mode is selected Edge Selects between rising edge and falling edge as the trigger source when the trigger mode is selected Power On Configuration When the unit powers up it will recall the last stored or recalled configuration Any changes to the configuration which were not saved are not restored Setting Auto Start Mode The unit may be configured to automatically start generating pulses after power up within the SYSTEM menu 16 AutoStart Disable or enable the autostart feature 17 18 505 Menus 505 Menus 505 Menu Structure CHANNEL Menu Channel Sync Delay Width Mode H Burst On Cycle Off Cycle Wait Polarity Amplitude Gate MODE Menu Period Mode H Burst On Cycle Off Cycle TRIG GATE Menu EXTin Level Gate Edge 20 Disable enable channel output Select sync source Sets delay from sync source until pulse is started Sets width of active portion of pulse Selects the channel timer mode Sets the number of pulses in the burst mode Sets the number of pulses in the duty cycle mode Sets the number
16. ess rien 14 Setting Communication Echo Mode ieri 14 Bettie Key Repeat Rate eau idea aaa 14 Setting Key and Knob Volume iis ee ee 14 Setting Pulse Timing Parameters u a ea diia 15 Setting Pulse Output Parameters sesse esse esse iii 15 Setting Pulse Mode of Operation nnn iii 15 Delaying the Start of Channel Output nono nonnnonncn Re ee ee ee 15 Rearming the Channel Timers ii AAA ma talud 15 Settine Pulse Gate Controla ur 16 Setting the System Internal Rate Generator i 16 Setting System Mode of Operation iii 16 Enabling System Trigger or Gilera aaa 16 Power Om Configuta lola iii 16 Setting Auto Start Mode ii an la i 16 4 505 Mens LI 505 Men Structure xii baile inc ie 18 CHANNEL Men A Ad 18 MODE Menta ia 18 TEIG GATE Menta 18 SYSTEM Mei AA ai 19 SETUP METAS AAA Aia 19 5 Operating the 505 cccsccscssccscsccsccscsscsccscsscsccssescs AL Quick Start Normal Internal Rate Generator Operation 22 Quick Start Normal External Trigger Operation nnen 22 System Timer Overview rico ion ee ER a 23 To Use Continuous Mode itato 23 Lo VISE SO Shot Mode israele lit 23 To Use Burst Modes sas a 23 To Use Duty Cycle Mode unteren 24 Channel Timer Overview sil RZ 24 To Use Normal Mode Function iia ii wessen ana 24 To Use Channel Single Shot Function
17. every time the RUN key is pressed Ifthe unit is in the active i e channels which are set to the Normal mode are producing pulses pressing the RUN key will reset the Single Shot counters and generate one pulse in sync with the other channels running in the Normal mode To use the Single Shot mode within the CHANNEL menu set the following parameters Channel Select Enable to enable channel output Delay Set the desired delay Width Set the desired pulsewidth Mode Select the Single Shot mode 26 To Use Channel Burst Mode Function The Burst mode generates a burst of pulses every time the RUN key is pressed If the unit is in the active i e channels which are set to the Normal mode are producing pulses pressing the RUN key will reset the Burst counters and gener ate a new set of pulses in sync with the other channels running in the Normal mode To use the Burst mode within the CHANNEL menu set the following parameters Channel Select Enable to enable channel output Delay Setthe desired delay Width Set the desired pulsewidth Mode Select the Burst mode Burst Set the number of pulses to produce in the burst To Use Channel Duty Cycle Function To generate a stream of pulses which oscillates on for n1 pulses and off for n2 pulses within the CHANNEL menu set the following parameters Channel Select Enable to enable channel output Delay Set the desired delay Width Set the desired pulsewidth Mode
18. g a simple command language The command set is structured to be consistent with the Standard Commands for Programmable Instruments SCPI Although due to the high number of special features found in the 505 many of the commands are not included in the specification The syntax is the same for both interfaces RS232 Interface Overview The serial portis located on the back of the 505 and uses a 9 pin D type con nector with the following pinout as viewed from the back of the unit 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 No Connection OO ONOOU POND The serial port parameters should be set as follows Baud Rate 4800 9600 19200 or 38400 Data Bits 8 Parity None Stop Bits 1 GPIB Interface Overview An optional GPIB also known s IEEE 488 computer interface is available for the 505 Before using this interface the address must be set using the GPIB address menu item The command set is the same for both the RS 232 and the GPIB interfaces Both interfaces may be used at the same time Responses will be made to the most recently used interface 32 Programming Command Types and Format The 505 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 an
19. gt Resets the Pulse Generator to the default Stores the current state of the Pulse lt numeric value gt Generator in local nonvolatile memory 1 through 10 are valid memory blocks Generates a software trigger pulse Operation is the same as receiving an external trigger pulse Appendix 41 Appendix A Specifications 505 Specifications DELAYS CHANNELS MODES DELAY PULSEWIDTH RESOLUTION ACCURACY TIMEBASE RMS Jitter BURST MODE EXTERNAL TRIG GATE RATE THRESHOLD INPUT RANGE TRIGGER SLOPE RMS JITTER INSERTION DELAY 2 4 or 8 independent outputs with digitally con trolled delay and pulsewidth Normal Single Shot Burst Duty Cycle 0 to 999 9999999 sec 100 ns to 999 9999999 sec 10 ns 10 ns 0001 setpoint 50 MHz 50 PPM crystal oscillator lt 5 ns 1 1 000 000 pulses Dc 2 MHz 200 mV 15V 0 30V Rising or falling edge lt 25 ns lt 250 ns INTERNAL RATE GENERATOR MODES RATE To period RESOLUTION ACCURACY RMS JITTER BURST MODE OUTPUTS IMPEDANCE SLEW RATE OVERSHOOT AMPLITUDE 42 Single shot burst continuous duty cycle 500 ns to 999 9999999sec 001 Hz to 2 MHz 10 ns 5 ns 0001 x period lt 500 ps 1 to 1 000 000 pulses 50 Ohms gt 2 V ns lt 100mV 10 of pulse Adjust up to 4 independently adjustable outputs 8 channel units 1 amp 6 2 amp 7 etc share the same output voltage 1 10 V into 50 Ohms load 2 20 V into high impedance l
20. he TRIG GATE menu EXTin Select Triggered mode Level Set the trigger threshold level Edge Select which edge rising or falling to trigger on Pressing the RUN key will arm the unit Once the unit is armed it will generate a T pulse for every external trigger received Pressing the STOP key will disarm the unit This mode corresponds to the normal external trigger mode found on most other pulse generators To Generate a Burst of Pulses on Every Trigger Input To generate a burst of pulses for every external trigger received set the following parameters within the MODE menu Mode Select the Burst mode Burst Setthe number of pulses to generate in each burst Period Set the period between pulses within the TRIG GATE menu EXTin Select Triggered mode Level Set the trigger threshold level Edge Select which edge rising or falling to trigger on Pressing the RUN key will arm the unit Once the unit is armed it will generate a set of pulses for every external trigger received The unit is reset at the end of a burst and will generate another set of pulses upon receiving a new trigger Triggers that occur in the middle of a burst are ignored Pressing the STOP key will disarm the unit To Start a Continuous Stream of Pulses Using the External Trigger The external trigger may be used to startthe unit generating pulses by setting the following parameters within the MODE menu Mode Select the Continuous mode Period
21. he 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 e Never work alone Someone should always be nearby to render aid if neces sary Training in CPR first aid is highly recommended Front Panel Overview Front Panel Overview BNC 505 Front Panels Display Layout and Indicators A2 line x 16 character backlit LCD display module displays all system param eters and status information The status information is located in the upper right corner of the display There are two enunciators e Rotating Pie Indicates the unit is actively generating pulses or armed and waiting for an external trigger e Vertical Arrow Indicates the function key has been pressed The upper left side of the display contains the title of the current menu The center top line contains the title of the current parameter The bottom line dis plays the value of the current parameter e Power Switch The power switch is located on the lower right corner of the front panel Push once to turn the unit on push again to turn the unit off Keypads The keypad provides access to the various menus and easy editing of the parameters needed to control the instrument e Function Key The system parameters are organized in menus which are accessed by pressing the FUNCTION key and then the appropriate function yellow labels All the
22. ing Events The 505 allows the user to control the relationship between the Channel Timers by setting the sync source for each timer Independent events are all timed relative to the internal T start pulse Dependent events may be linked together by setting the sync source to the controlling event This allows the instrument to match the timed events and adjustments can be made in one event without detuning the timing between it and a dependent event Selecting Menus Parameters are grouped in menus selectable using the yellow menu keys To select the channel parameters press the FUNCTION key and the CHANNEL key Repeat this process until the desired channel appears To select other menus press the FUNCTION key and then the key corresponding to the desired func tion 11 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 two 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 Alternately 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 de pendent resolution Slow rotation will increment or decrement the active digit by one As you increase the speed
23. ing configuration 0 the following parameters need to be set Pulse Width Delay Enter the CHANNEL menu by pressing the FUNCTION key and then the CHANNEL key Enterthe required pulse width and delay Repeat for each output channel T Period Enter the MODE menu by pressing the FUNCTION key and then the MODE key Press the NEXT key until the Period menu is displayed Set the desired pulse pe riod Note that in general the pulse delay plus the pulse width for any channel should be less than the T period Start Press the RUN key to start generating pulses Stop Press the STOP key to stop generating pulses Quick Start Normal External Trigger Operation To generate a single pulse for every external trigger event based on the default configuration 0 the following parameters need to be set System Mode Enter the MODE menu by pressing the FUNCTION key and then the MODE key Press the NEXT key until the Mode parameter is displayed Select Single Shot mode EXTin Enter the TRIG GATE menu by pressing the FUNCTION key and then the TRIG GATE key Press the NEXT key until the EXTin parameter is displayed Select Trig gered Level Press the NEXT key until the Level parameter is dis played Set the trigger threshold voltage to approxi mately 50 of the trigger signal amplitude 24 Edge Press the NEXT key until the Edge parameter is dis played Set the instrument to trigger off the rising edge or falling edge as desired Pulse Wid
24. ion Echo Mode e Comm Echo Selects whether to echo characters back to the host computer or not Setting Key Repeat Rate e Key Rate Sets the rate at which the keys will repeat when held down This is most useful when using the Up Down ar rows to change parameters 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 14 Setting Key and Knob Volume e Key Volume Sets the key click volume e Knob Volume Sets the parameter adjustment knob click volume Setting Pulse Timing Parameters Within the CHANNEL menu set the delay until the start of a pulse and the pulsewidth e Delay Sets the delay from the sync source to the start of the pulse e Width Sets the width of the active portion of the pulse Setting Pulse Output Parameters Within the CHANNEL menu set the pulse polarity and the pulse amplitude whether the pulse is active high or active low e Polarity Sets the pulse polarity either active high or active low using the arrow keys or the rotary knob e Amplitude Sets the pulse amplitude 2 to 20 volts with a high im pedance load Setting Pulse Mode of Operation Each channel may be set independently to operate in one of four modes normal single shot burst or duty cycle within the CHANNEL menu e Mode Selects the mode for the current channel Additional parameters are provided for the burst mode and the duty cycle mode e Bu
25. nerated for each start command e Burst Mode n T pulses are generated for each start command e Duty Cycle Once started T pulses cycle on and off continuously The T pulses are distributed to all of the start inputs of the Channel Timers and Mode Generators 10 Channel Timer Functions The Channel Timer functions as a non retriggerable delayed one shot pulse generator This means that the timer will only generate one delayed pulse for every start pulse received Once the channel timer has started counting addi tional start pulses will be ignored until the pulse has been completed non retriggerable The start pulse for each channel is provided by the internal T pulse generated by the Internal System Timer Whether or not a pulse is gener ated for each T pulse is determined by the Channel Mode Generator Standard modes include e Normal A pulse is generated for each T pulse e Single Shot One pulse is generated at the first T pulse after which output is inhibited e Burst A pulse is generated for each T pulse n times after which output is inhibited e Duty Cycle A pulse is generated for each T pulse n times after which the output is inhibited for m times The cycle is then repeated Different modes may be selected for each output allowing a wide variety of output combinations Each output may also be independently disabled or gated using the external trigger input Dependent amp Independent Tim
26. nnonoconnannnanonoos 36 505 SCPI Command Summary ii 37 IEEE 488 2 Common Commands ii 38 APPERAIK ss di ire Appendix A Specifications 0000000000000000000000000000000000006060 40 509 Specifications lilla 40 Introduction Introduction This manual is a reference designed to familiarize you with the Berkeley Nucle onics 505 pulse generator and is arranged so that you can easily find the infor mation you re looking for Generally each topic has its own section and no section assumes that you ve read anything else in the manual Technical Support For questions or comments about operating the 505 our technical staff can be reached via one ofthe following methods Phone 415 453 9955 Fax 415 453 9956 Internet www berkeleynucleonics com Warranty In addition to a 30 day money back guarantee the 505 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 Package Contents The box you receive should contain the following 505 Pulse Generator AC Power Cord User s Manual Contact Berkeley Nucleonics 415 453 9955 if any parts are missing Safety Issues Normal use of test equipment presents a certain amount of danger from electri cal shock because testing must be performed where exposed voltage is pre
27. oad COMPUTER INTERFACE RS232 4800 9600 19200 38400 Baud All instrument functions and settings may be con trolled over the interface bus GENERAL STORAGE Storage for 6 complete configurations may be stored and recalled from the front panel or the computer interface DIMENSIONS T5 x9 x4 WEIGHT 6 lbs POWER 20 Watts 100 240 VAC 50 60 Hz 43 44 45
28. ode 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 has been disarmed will generate a new pulse train 13 Enabling External Gate Control e EXTin Selects external input usage for controlling T dis abled edge triggered or level gated 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 synchro nizes the T 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 Power On Configuration Upon power up the unit will load the last configuration stored or recalled Ifthe Autostart mode is enabled the unit will begin generating pulses after loading the latest configuration Setting Auto Start Mode e Auto Auto run startup function allows unit to automatically generate pulses after startup is complete Setting System Serial Port Baud Rate e Baud Rate Selects the baud rate within the SYSTEM menu for the RS232 interface NOTE The unit will not respond to computer commands unless the appropri ate BAUD rate or GPIB address is selected Setting Communication GPIB Address e GPIB Address Selects the GPIB Address within the SYSTEM menu Setting Communicat
29. of channels 185 28 6 387 and 4 amp 8 share the same voltage supply The external input provides a trigger and or gate func tion for both the system timer and the channel timers Pulse Concepts and Pulse Generator Operations Pulse Concepts and Pulse Generator Operation Counter Architecture Overview To Internal System Timer and System Mode Generator Internal To Pulse RUN Command External Input Channel Timers and Channel Output Mode Generators Pulses Start source is 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 a second time System Timer Functions The System Timer functions as a non retriggerable multi vibrator pulse genera tor This means that once started depending on the mode the timer will pro duce 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 Generator Standard modes include e Continuous Once started T pulses are generated continuously e Single Shot One T pulse is ge
30. of pulses to inhibit output in the duty cycle mode Sets the number of pulses to inhibit before enabling pulse output Sets the polarity active high or active low of the output pulse Sets the amplitude of the output pulse Enables channel gating Selects the internal T system period Selects the system timer mode Sets the number of pulses in the burst mode Sets the number of pulses in the duty cycle mode Sets the number of pulses to inhibit output in the duty cycle mode Enables trigger or gated system mode Sets the trigger threshold Selects active high or active low gating Selects rising or falling edge trigger SYSTEM Menu Baud Rate Comm Echo GPIB Addr Key Vol Key Rate Knob Vol Autostart Mark SETUP Menu Store Recall Selects the RS232 baud rate Enables RS232 input echo Sets the GPIB address Sets the key beep volume 0 is off Sets the key repeat rate Sets the knob beep volume Enables pulse output on startup Selects the decimal point character Store the current configuration Reloads the requested configuration 21 22 Operating the 505 23 Operating the 505 Quick Start Normal Internal Rate Generator Operation The 505 has a powerful set of functions providing a number of modes of opera tion Most of these functions can be ignored if all one wants to do is generate a simple continuous stream of pules Starting from the default settings which can be loaded by recall
31. param eters for one channel are grouped together in the CHANNEL menu To access additional channels press the FUNCTION key and then the CHANNEL key while in the CHANNEL menu and the menu will incre mentthe channel number The contents of each ofthe menus is discussed in detail in section 4 of this manual Next Key The NEXT key provides access to all the parameters in a menu Pressing the NEXT key selects the next pa rameter in the currently displayed menu Arrow Keys The up down arrows are used to increment decrement the current parameter For numeric parameters the blinking cursor indicates which digit will be incremented The right left arrows are used to change the selected digit for numeric parameters Rotary Knob Channel Outputs External Input The Rotary Knob may be used to adjust the current pa rameter as an alternate to the ARROW keypad The step size is controlled by the position of the cursor However turning the knob faster will increase the step size Pushing the knob performs the same function as pushing the NEXT key selecting the next parameter in the currently displayed menu The pulse generator output is available from BNC con nectors on the front panel The output is adjustable from 2V to 20V into a high impedance load The drive impedance is 50 ohm so if the load is 50 ohm the out put voltage will be one half of the set voltage Eight channel units share power supplies between pairs of channels Four pair
32. rated by a colon data parameters and terminators For example SCPI Query Format PULSE1 STATEON lt cr gt lt lf gt PULSe1 WIDth 0 000120 lt cr gt lt lf gt PULSe POL NORMal lt cr gt lt lf gt 33 Any parameter may be queried by sending the command with a question mark appended For example PULSE1 STATE Will return 1 lt cr gt lt lf gt PULSE 1 WIDT lt cr gt lt lf gt Will return 0 000120000 lt cr gt lt lf gt PULSE1 POL lt cr gt lt lf gt Will return NORM lt cr gt lt lf gt SCPI Keyword Separator A colon must always separates one keyword from the next lower level key word A space must be used to separate the keyword header from the first parameter SCPI Optional Keywords Optional keywords and or parameters appear in square brackets in this document s command syntax Note that the brackets are not part of the com mand and should not be sent to the pulse generator 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 to be sent to the pulse generator The numeric parameters correspond to the following channels 0 To 1 T1 2 T2 et
33. rst Sets the number of pulses in the burst mode to gener ate before inhibiting output e On Cycle Sets the number of pulses to generate before inhibiting output e Off Cycle Sets the number of pulses to inhibit before repeating the On Cycle Delaying the Start of Channel Output Within any channel mode the output of the channel can be delayed using the wait parameter within the CHANNEL menu e Wait Sets the number of T pulses to wait until enabling the channel output Rearming the Channel Timers In the single shot mode and the burst mode the Channel Timers may be rearmed after completing the pulse train by pushing the RUN key again 15 This allows other channels to be run continuously without interruption while generating individual pulses or a burst of pulses on the single shot or burst mode channels Setting Pulse Gate Control Enables the use of the external input to gate the channel output within the CHANNEL menu e Gate Enables disables the channel gating using the external trigger Enables the gate by selecting either active high or active low This function is independent of any other use of the trigger input Care should be taken to insure that all uses of the trigger input are compatible Setting the System Internal Rate Generator Set the internal T period within the MODE menu e Period Sets the internal rate generator period Setting System Mode of Operation Sets the System Timer Mode within the MODE m
34. sent 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 volt age and steer current away from your heart in case of accidental contact with a high voltage You will significantly reduce the risk factor if you know and observe the following safety precautions e f possible familiarize yourself with the equipment being tested and the location of its high voltage points However remember that high voltage may appear at unexpected points in defective equipment e Do not expose high voltage needlessly Remove housing and covers only when necessary Turn off equipment while making test connections in high voltage circuits Discharge high voltage capacitors after shutting down power e 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 transformer etc e 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 e Use t
35. th Delay Enterthe CHANNEL menu by pressing the FUNCTION key and then the CHANNEL key Enterthe required pulse width and delay Repeat for each output channel Start Press the RUN key to start arm the instrument The 505 will now generate a pulse for every valid trigger Stop Press the STOP key to stop disarm the instrument i e to stop generating pulses System Timer Overview For internal operation the 505 contains a timer and mode generator which generates an internal T clock that is used to trigger all the channel timers The period and the modes are controlled via the MODE menu The various modes are described below To Use Continuous Mode To generate a continuous stream of pulses within the MODE menu set the following parameters Mode Select Continuous for the system mode Period Select the desired period Pressing the RUN key will now generate a stream of pulses ata rate specified by the period parameter To Use Single Shot Mode To generate a single pulse with every press of the RUN key within the MODE menu set the following parameters Mode Select Single Shot for the system mode Pressing the RUN key will now generate a single pulse To Use Burst Mode To generate a burst of pulses within the MODE menu set the following param eters Mode Select Burst for the system mode Burst Selectthe number of pulses n in a burst Period Select the desired period 25 Pressing the RUN key will now gener
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