SRS Labs SR430 Page 129 Manual Download

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128

Part List

Summary of Contents for SR430

Page 1: ...erager Model SR430 1290 D Reamwood Avenue Sunnyvale CA 94089 USA Phone 408 744 9040 Fax 408 744 9049 www thinkSRS com e mail info thinkSRS com Copyright 1999 All Rights Reserved Revision 1 5 8 2007 Stanford Research Systems ...

Page 2: ......

Page 3: ...EE 488 Connector 25 RS232 Connector 25 Parallel Printer Connector 25 PC Keyboard Connector 26 BNC Connectors 26 MENUS Levels Menu 27 Mode Menu 29 Display Menu 35 Setup Menu 37 Save Menu 47 Recall Menu 53 Math Menu 59 Plot Menu 67 Test Menu 69 Info Menu 73 INSTRUMENT SETUPS Default Setup Power On Clear 75 Choosing Bin Width Record Length 76 Accumulation 76 Using the Trigger Offset 76 Using SYNC BUS...

Page 4: ...sition 114 CIRCUIT DESCRIPTION Circuit Boards 115 Video Driver and CRT 116 CPU Board 116 Microprocessor System 116 Keypad Interface 116 Keyboard Interface 116 Spin Knob 117 Speaker 117 Clock Calendar 117 Printer Interface 117 Video Graphics Interface 117 Disk Controller 117 GPIB Interface 117 RS232 Interface 117 Expansion Connector 117 Power Supply Board 118 Unregulated Power Supplies 118 Power Su...

Page 5: ...power source and to a protective ground The exposed metal parts of the instrument are connected to the outlet ground to protect against electrical shock Always use an outlet which has a properly connected protective ground WARNING REGARDING USE WITH PHOTOMULTIPLIERS The signal inputs may be damaged if a photomulti plier is used improperly with the photon counter When left completely unterminated a...

Page 6: ...4 ...

Page 7: ...lation is complete the memory is re armed for the next trigger The number of records accumulated is programmable 1 to 65 535 or free run The count capacity is 32 767 per bin per trigger The total accumulation capacity per bin is also 32 767 The SYNC BUSY output for each record remains high from the trigger until the end of accumulation When SYNC BUSY returns low another trigger can be received The...

Page 8: ... bin per trigger Records per accumulation 1 to 64k or free run Maximum accumulation 32 767 per bin in Add mode 16 383 per bin in Toggle or External mode Add Subtract Records may be added or added an subtracted Toggle between add and subtract every N triggers where N is programmable External subtract input may also control the toggle TRIGGER RATE Minimum period between triggers Tp Record time Accum...

Page 9: ...to be subtracted from the accumulation in external toggle mode GENERAL Interfaces IEEE 488 RS 232 and Centronics Printer standard All instrument functions can be controlled and read through the IEEE 488 and RS 232 interfaces Hardcopy Screen dumps to Epson compatible dot matrix or HP LaserJet print ers parallel Plots to HPGL compatible plotters serial or IEEE 488 Disk 3 5 MSDOS compatible format 72...

Page 10: ...an is done press AUTOSCALE to scale the display The TEST output is a 50 MHz signal so a pulse occurs every 20 ns or every 4 bins The data should have 1000 counts in every 4th bin Use the Mode menu to select different bin widths and records per scan Records with longer bin widths trigger at lower rates so the trigger rate needs to be lowered to avoid RATE errors Use the formula for Tbusy in the Spe...

Page 11: ... center the cursor Same as CENTER key LEFT i Set the Left edge of the graph to bin i BOTM i x Set the Bottom of the graph to i counts or x value HSCL i Set the Horizontal Screen Width to 8 bins 0 through 16k bins 22 VSCL i x Set the Vertical Scale to i counts division or x division in a 1 2 5 10 sequence CURS i Turn the Cursor Off 0 or On 1 CURW i Set the Cursor Width to Normal 0 Wide 1 or Spot 2 ...

Page 12: ... the cursor only DATA ACQUISITION CONTROL SSCN Start data acquisition Same as START key PAUS Pause a scan in progress Same as STOP key while BUSY CLRS Reset the data memory Same as STOP key while DONE SCAN Query the number of records which have been accumulated so far DATA TRANSFER BINA i Read the entire data record in ASCII format If i included read only bin i data BINB Read the entire data recor...

Page 13: ...ords The number of records in a scan may be pro grammed from 1 to 65 535 SR430 OVERVIEW The SR430 data acquisition timing is diagrammed below A trigger starts a record of up to 32 704 time bins T1 T2 TN Each time bin is of equal duration and is programmable from 5 ns to 10 ms There is no dead time between time bins During each time bin signal pulses are counted At the end of each time bin the coun...

Page 14: ...med to be much larger than 250 ns then the busy time is almost to tally due to the real time data acquisition and virtu ally no time is lost processing or accumulating SYNC BUSY is only output during actual data ac quisition Triggers that arrive when the unit is not acquiring data will not cause a SYNC BUSY out put BIN CLOCK OUTPUT The front panel BIN CLK output is a 50 NIM lev el signal showing t...

Page 15: ...g data the number of bins per record and the number of records per scan must be programmed The record length N is the num ber of time bins in a single record Each trigger will take N data points corresponding to N sequential time bins N may be programmed from1024 to 32704 including Trigger Offset Records are accumulated until the number of records per scan R have been acquired R may be programmed ...

Page 16: ...e TEST output is used to test that the counter and accumulator are working properly By connecting the TEST out put to the SIGNAL input a known number of counts can be put into every time bin This allows the user to quickly check the functionality of the unit DISK DRIVE The 3 5 disk drive is used to save data setups and configurations The format is DOS compatible and the capacity is 720k COMPUTER I...

Page 17: ...rightness control knob located at the upper left corner As with most video displays do not set the brightness higher than necessary The display may be adjusted left and right using the Setup Screen function in the SETUP menu The main area of the display is occupied by the data display Data is graphed as accumulated counts per bin on the vertical axis and bin or time from trigger on the horizontal ...

Page 18: ...the SR430 may be read by PC compatible computers equipped with a 3 5 drive and DOS 3 0 or higher BNC CONNECTORS TRIGGER The rising or falling edge of the TRIGGER input triggers a record The input impedance is 10 KΩ and the minimum pulse width is 10 ns The trigger level is adjustable from 2V to 2V with either slope The minimum pulse amplitude is 100 mV SYNC BUSY TTL output high whenever the SR430 i...

Page 19: ...ains con stant while the vertical and horizontal scales may be changed The graph area has a dotted grid for reference There are 8 vertical divisions and 10 horizontal divisions In addition to X and Y scaling the graph may also be translated in the X and Y di rections Data is shown in 2 modes depending upon the X scaling There are 496 pixels or X screen locations across the graph If the number of b...

Page 20: ...ata within the re gion When a spot cursor region is used the cur sor marker is confined to a single X screen loca tion However depending upon the horizontal scaling each X screen location may represent multiple data points The cursor marker can still seek the min max or mean of the data at a single X screen location The Cursor Position displays the X position bin and time and the Y data of the cur...

Page 21: ...ic leg ends printed below each key The ENTER key has the same function in the ALTERNATE keypad To enter the ALT mode press the ALT key once Pressing the keys will now enter alphabetic char acters into the active entry field To return to the normal keypad press the ALT key again Trigd Flashes on whenever a record is triggered during data acquisition Trigd does not flash unless the unit is in the BU...

Page 22: ...20 Guide To Operation ...

Page 23: ... zero The CLEAR condition is indicated by the CLR data acquisition status indi cator Triggers which arrive while in the CLEAR state are ignored and SYNC BUSY and BIN CLK OUT are inactive START begins the data acquisition The first trig ger after START is pressed will trigger the first data record The data acquisition status will switch to BUSY Successive triggers will acquire records which are acc...

Page 24: ...umulated will be lost and reset to zero In general pressing the STOP key twice in suc cession will put the unit in the CLEAR condition IMPORTANT NOTE Data which is cleared can not be recovered Be sure to save valuable data to the disk to avoid accidentally erasing it MENU KEYS All operating parameters of the SR430 are grouped into ten function menus The ten menu keys select which menu of parameter...

Page 25: ...values are divided by the cursor marker data val ue The new value of the cursor marker data is 1 000 The new data will no longer be counts per bin but will simply be floating point numbers See 10 0 mV 0 0 V 0 0 V 10 cnts Div bin 127 1 300 msec Record 100 bin 71 Y 50 cnts 727 0 µsec 500 mV Trigger Level Trigger Slope Disc Level Disc Slope Aux 1 Level Aux 2 Level the description of the MATH menu for...

Page 26: ...24 Guide To Operation ...

Page 27: ...will control the plotter to generate plots of the screen graph In this case use the SETUP PLOTTER menu to configure the SR430 to use a GPIB plotter RS232 CONNECTOR The RS232 interface connector is configured as a DCE transmit on pin 3 receive on pin 2 The baud rate parity and word length are pro grammed from the SETUP RS232 menu To con nect the SR430 to a PC serial adapter which is usually a DTE u...

Page 28: ...the accu mulation This input is sampled at the trigger to de termine what to do with the ensuing data record TOGGLE OUT The TOGGLE OUT is a TTL signal which indicates what the accumulation mode of the next record will be This output is only used if the accumulation mode is set to TOGGLE TOGGLE switches at the end of the SYNC BUSY time to reflect the accu mulation mode of the next trigger If TOGGLE...

Page 29: ...igger is 0 1V Trigger Slope The Trigger Slope key changes the trigger slope to either rising or falling edge Discriminator Level The Discriminator Level key selects the discriminator threshold as the ac tive entry field A new threshold level may be entered from the numeric keypad in units of Volts or the knob may be used to adjust the level The discriminator threshold is adjustable from 300mV to 3...

Page 30: ...e output level of the AUX 1 output as the active entry field A new output level may be entered from the numeric keypad in units of Volts or the knob may be used to adjust the present level The output level is adjustable from 10 000V to 10 000V with 5mV resolution Aux 2 Level The Aux 2 Level key selects the output level of the AUX 2 output as the active entry field A new output level may be entered...

Page 31: ...roduction The Mode menu sets up the data acquisition parameters including bin width accumulation mode bins per record and records per scan With the exception of the Records Scan and the ReAcquire Offset these pa rameters may not be changed unless the unit is in the CLEAR state Re Acquire may only be performed when data acquisition is done Bin Clock Source This key toggles the time base of the time...

Page 32: ...y field Both numeric entry and knob adjustment are allowed The Records Scan is the number of records which will be accumulated before the data acquisition is DONE The Records Scan may be programmed from 0 to 65 535 When set to 0 accumulation will continue indefinitely until the STOP key is pressed This mode of operation is useful when setting up an experiment since the BIN CLK OUT and SYNC BUSY ou...

Page 33: ...s to be subtracted and TTL low when the next record is to be added The TOGGLE output switches at the end of SYNC BUSY to reflect the accumulate mode of the next triggered record When data acquisition is started the first toggle count number of records is added before switching to subtract The Add Sub status indica tor on the screen shows the toggle status during a scan Toggle is gener ally used fo...

Page 34: ...completed ReAcquire The ReAcquire key will restore the display buffer with data from the data acquisition memory The total accumulated record of data is always avail able in the data acquisition memory while in the DONE state When the STOP RESET key is used to reset to the CLEAR state all accumulated data is lost The number of bins transferred to the display memory for graphing and analysis is equ...

Page 35: ...try field Since the Offset value may be less than the Trigger Offset bins which were not originally displayed while the data was taken may be displayed using ReAcquire Return The Return key will return to the first Mode menu Trigger Offset 0to16320 Bins Record 1024to16384 DataAcquisitionMemory 32704 ReAcquiredDisplayMemory equaltoBins Record Total Acquired Data From Offset ...

Page 36: ...34 Mode Menu ...

Page 37: ... Translate key again will toggle to the other axis Horizontal translation is in increments or 1 100 of the screen width round ed up to the nearest integer number of bins Translation below bin 0 or past the last bin is not allowed Vertical translation is in increments of 1 10 of a division or 1 count whichever is larger If the data is in floating point representation as a result of a Math function ...

Page 38: ...l dashed lines on the graph Normal width is 1 2 of a division Wide is 1 division and Spot is a single X position on the screen the cursor marker is a single dashed line The cursor region moves to the left and to the right a single pixel at a time There are 496 pixels across the graph Cursor Seeks The cursor marker searches the data points within the cursor region for the maximum or minimum data va...

Page 39: ...n SETUP Communications Sound Time Plotter Printer Introduction The Setup menu is used to configure the printer plotter and computer in terfaces and set the sound and clock calendar parameters Setup Keys Each Setup Key activates a sub menu Each sub menu is described in detail in the following pages ...

Page 40: ...R430 from a com puter Setup RS232 The Setup RS232 key activates the RS232 parameters sub menu Baud rate word length and parity may be configured in this sub menu GPIB RS 232 GPIB Output To Setup Setup View RS232 Queues Return Overide Remote GPIB Address Return Parity Word Length Baud Rate Setup GPIB Setup RS232 Output To Rs232 GPIB SETUP Communications Return View Queues Return Setup Communication...

Page 41: ...GPIB key activates the GPIB parameters sub menu GPIB in strument address and Remote Overide are set in this sub menu GPIB Address This key activates the GPIB Address entry field for nu meric and knob entry The instrument address can be set from 0 to 30 Overide Remote In general every GPIB interface command will put the SR430 into the REMOTE state with the front panel inac tivated To defeat this fe...

Page 42: ...n general the View Queues screen should be dis played only when testing or debugging a host program The most recent data is displayed at the right of the upper line of each queue display For example in the screen below the DCLV lf string was the most recently received command The lf character is a line feed and is the string delimiter The most recently transmitted string is 010000 lf in response t...

Page 43: ...click and alarms are enabled and disabled in this sub menu Key Click This key turns the key click on and off Alarms This key enables and disables the audible alarms Alarms will sound whenever a front panel programming error or interface error occurs Alarms are also used to draw the user s attention to a message Return The Return key will return to the main Setup menu ...

Page 44: ...nd does not advance until the menu is redrawn This key toggles the entry field from hours to minutes to seconds A new entry may be made using the knob When the knob is used the clock is set whenever the highlighted value is changed Date The date is displayed as month day year The date displayed is the date when the Setup Time menu was displayed and does not advance until the menu is redrawn This k...

Page 45: ...tart plotting use the PLOT key to select the Plot menu Plot Mode The SR430 can drive either an RS232 or GPIB interface plotter The plot ter must be HP GL compatible This function selects which interface to use The plotter connects to the RS232 or GPIB connector on the rear panel Baud Rate If the Plot Mode is RS232 then the Baud Rate for the plotter may be se lected The baud rate is adjusted using ...

Page 46: ...ble pen numbers are from 1 to 6 When using a single pen plotter all features are plotted using the one pen re gardless of the pen definitions RS 232 GPIB Plot Mode Plotter Addr Plot Speed Define 1 Pens Return Trace Pen This field assigns a pen number to the data trace on the screen Grid Pen This field assigns a pen number to the graph grid Alpha Pen This field assigns a pen number to all of the al...

Page 47: ...nter attached to the parallel printer port The PRINT key prints the screen to the printer Printer Type This function toggles the Printer Type between Epson and HP Epson is used for any Epson compatible graphics dot matrix printer and HP is used for an HP LaserJet laser printer or compatible Return The Return key will return to the main Setup menu ...

Page 48: ...reen menu is used to adjust the position of the display on the screen The display area may be moved left and right Move Right This function moves the display to the right on the screen Move Left This function moves the display to the left on the screen Return The Return key will return to the main Setup menu ...

Page 49: ...roduction The Save menu is used to save data and parameters to disk The Disk Utilities menu can erase files and format blank disks Files are saved as DOS files and can be read by a DOS compatible computer with a 3 5 disk drive The file format is described in the Remote Programming sec tion Save Keys Each Save Key activates a sub menu The Save Trace Settings and System menus are similar ...

Page 50: ... The highlighted file name will be copied into the File Name field If the Save Trace key is now pressed the data will be saved under an existing file name and the previous version of that file will be lost A warning message will appear if the File Name is al ready in use on the disk To create a new file name use the File Name key Directory entries made by the SR430 also have a type field shown in ...

Page 51: ...Only files created by the SR430 have a type Files created and saved on a DOS computer will not have a type dis played The file type is not necessary it is only an aid to identifying files Return The Return key will return to the main Save menu Re turn also removes the catalog display screen and re stores the graph ...

Page 52: ...and Mode menus i e the hardware configuration of the data acquisition system Return Save Catalog TEST DAT Off On File Name Settings Save System Pressing this key will save the current system informa tion Setup menu data to the file specified in the File Name field File Name This key activates the File Name entry field File names are entered using the keypad and alternate keypad The ALT key allows ...

Page 53: ... the highlighted file To select a file activate the cursor with the CURSOR key and use the knob to scroll the file entries Make sure the selected file is the correct file before pressing this key Return The Return key will return to the main Save menu Re turn also removes the catalog display screen and re stores the graph Return Format Disk Erase File Disk Utilities The Disk Utilities sub menu con...

Page 54: ...52 Save Menu ...

Page 55: ...l System Return Erase File Format Disk Introduction The Recall menu is used to recall data and parameters from disk Files may be recalled only when the unit is in the CLR state data memory cleared The Disk Utilities menu can erase files and format blank disks Recall Keys Each Recall Key activates a sub menu The Recall Trace Settings and System menus are similar ...

Page 56: ... pear in the File Name field Activating the cursor by pressing the CURSOR key allows the knob to scroll through the directory The highlighted file name will be copied into the File Name field If the Recall Trace key is now pressed the data in the highlighted file will be read Directory entries made by the SR430 also have a type field shown in the catalog display Files with type SET Return Recall C...

Page 57: ...he directory on the disk Only files created by the SR430 have a type Files created and saved on a DOS computer will not have a type dis played The file type is not necessary it is only an aid to identifying files Return The Return key will return to the main Recall menu Re turn also removes the catalog display screen and re stores the graph ...

Page 58: ...y screen and re stores the graph Recall Settings The Recall Settings sub menu is used to recall the settings in the Levels and Mode menus i e the hardware configuration of the data acquisition system from a disk file Settings may not be recalled unless the unit is in the CLR state data memory is reset Return Recall Catalog TEST DAT Off On File Name Settings Recall System Pressing this key will rea...

Page 59: ... the highlighted file To select a file activate the cursor with the CURSOR key and use the knob to scroll the file entries Make sure the selected file is the correct file before pressing this key Return The Return key will return to the main Recall menu Re turn also removes the catalog display screen and re stores the graph Return Format Disk Erase File Disk Utilities The Disk Utilities sub menu c...

Page 60: ...58 Recall Menu ...

Page 61: ...smoothing points Smoothing is performed on the entire data record in display memory re gardless of graph scaling Smoothing the data will change the data from integer count data into single precision 16 bits floating point representa tion Any calculation which requires a greater range will either underflow return zero or overflow An operation which overflows will display an er ror message and abort...

Page 62: ...s displayed below the graph Smoothing may be repeated until the desired noise reduction is attained Return The Return key will return to the main Math menu 25 pt 21 pt 17 pt 11 pt 5 pt 25 pt 256 µsec 21 pt 215 µsec 17 pt 174 µsec 11 pt 113 µsec 5 pt 51 2 µsec Return menu Once smoothed the data remains in floating point form even when the Smooth menu is exited If floating point data is saved to dis...

Page 63: ...rrent value of chi squared is displayed The algorithm is designed to terminate when the change in chi squared falls below 0 1 although the fit may be terminat ed at any time by pressing the Abort key When the fit terminates the best fit curve is plotted and the parameters of the fit are displayed at the bottom of the screen Pressing any key to continue will restore the graph to normal See View Par...

Page 64: ...ounts bin and counts second Exp Fit y ae t t0 b c t0 horizontal offset in bins and time units a amplitude in counts b time constant in bins and time units c vertical offset in counts Gauss Fit y ae t b 2 c where t t t 0 t0 peak center position in bins and time units a amplitude in counts b line width in bins and time units c vertical offset in counts Left and Right Limit The Left and Right Limit f...

Page 65: ...al lines as shown below Return The Return key will return to the main Math menu Any displayed fit will be removed and the graph restored Re entering the Fit menu and using the View Parameters function will re display the most recent fit DONE Limit Return bin 0 0 msec bottom 0 cnts 10 cnts Div bin 127 1 300 msec Record 100 SRS bin 110 Y 27 cnts 1 126 msec Type of Fit View Left Right Limit Do FIt Pa...

Page 66: ...ata save the count data to a disk file before performing Calc menu operations Do Calc log sqrt Return Operation Argument Type Argument Cursor 1 234 to Arg Const File Operation MATH Calc Argument Type Do Calc Cursor to Arg Return Constant File Argument Catalog On Off File Name Operation The Operation function selects the type of operation to be performed The add subtract multiply and divide functio...

Page 67: ...ment Integer 3 real 3 0 or floating point 0 3E 1 formats are all allowed Cursor to Arg The Cursor to Argument will copy the data value of the cursor marker to the constant argument field above This is convenient when subtracting a baseline or normalizing to a data point If the Argument type is a file then the file selection functions are dis played File Name Pressing the File Name key activates th...

Page 68: ...ints are calculated and displayed below the graph Total 8 619800e 004 Press Any Key to Continue Mean 3 367109e 002 1 936988e 001 Baseline Tot 3 840000e 004 σ Left and Right Limit The Left and Right Limit functions set the left and right limits of the calcu lation region The default positions of the limits are the the left and right edges of the graph To move a limit move the cursor using the knob ...

Page 69: ... Each feature uses the pen assigned in the Setup Plotter menu Features such as the cursor or a curve fit are plotted only if they are presently displayed Plot Trace The Plot Trace key plots only the data trace This allows multiple data traces to be plotted on a single sheet Traces may be made in different colors by changing pen definitions or pens between plots Plot Cursor The Plot Cursor key plot...

Page 70: ...68 Plot Menu ...

Page 71: ...f the manual Keypad Test This key activates the keypad test screen The keypad test screen dis plays a map of the keypad with each key represented by a small square Pressing each key will highlight the corresponding square When all squares are highlighted the test is complete Keyboard Test This key activates the keyboard test screen Characters typed on an at tached PC keyboard in PC or 8088 mode wi...

Page 72: ... Pressing this key will print the graphics screen on the printer This action is the same as using the PRINT key Print String Pressing this key prints a text string to the printer If the Print String test works but the Screen Dump test fails then the printer probably does not support the Epson or HP LaserJet graphics mode Return The Return key will return to the Test menu Disk Drive Test Pressing t...

Page 73: ...strument Memory Test The Memory Test key activates a memory test sub menu Select the de sired memory test Main Mem Video Mem Return Main Memory Pressing this key tests the program ROM and data RAM on the CPU board The data acquisition memory is not tested See the Test and Calibration section for more in formation on testing the data acquisition hardware Video Memory Pressing this key tests the vid...

Page 74: ...72 Test Menu ...

Page 75: ...ch may be help ful to the user About the SR430 This key displays the SR430 specifications About SRS This key displays information about Stanford Research Systems Inc Operating Hints This key displays information about the use of the SR430 Command List This key displays a list of the remote commands available Status Bytes This key displays an explanation of the remote programming status bytes Funda...

Page 76: ...74 Info Menu ...

Page 77: ... Registers Cleared 75 If there is a memory error when the unit is turned on then the default settings will be used instead of the set up retained in memory This can be due to a low battery The default setup may also be recalled using the RST command In this case the communications parame ters and status registers are not changed Menu Item Setting Trigger Level 100 mV Trigger Slope Positive Discrim...

Page 78: ...large data points Another reason is that wide bins mean less resolution when measuring narrow features When curve fitting over a small number of bins the fit may be less accurate Thus choosing the combination of bin width and number of bins is a compromise in many situa tions In general do not use more bins than neces sary since the extra resolution may not yield any more information Data may need...

Page 79: ...his is not a problem if the bin width is much longer than 2 5 ns but may be a problem for shorter bin widths In these cases the SYNC BUSY output should be used to trigger the experiment Since the record is synchronized to SYNC BUSY there will be no in determinacy of the time bins with respect to the experiment One way to accomplish this is to trig ger the SR430 with the experiment s master rate ge...

Page 80: ...sent on one command line separated by semicolons of course the answers will be returned individually each with a terminator Examples of Command Formats The SR430 Multichannel Scaler Averager may be remotely programmed via either the RS232 or GPIB IEEE 488 interfaces Any computer sup porting one of these interfaces may be used to program the SR430 Both interfaces are receiving at all times however ...

Page 81: ...eck that these operations executed without error In these cases after the command is sent the Status Bytes should be queried When using the GPIB interface serial polling may be used to check Interface Ready bit in the Serial Poll Byte while an operation is in progress After the Interface Ready bit becomes set signalling the completion of the command then the ERR bit may be checked to verify succes...

Page 82: ... the out put level The response is a floating point value AUX2 x The AUX2 command sets or reads the AUX 2 output level The AUX2 x command sets the output level to x Volts where 10 000 x 10 000 The resolution is 0 005V 5 mV The AUX2 command queries the out put level The response is a floating point value DETAILED COMMAND LIST The four letter mnemonic in each command sequence specifies the command T...

Page 83: ...eter i is an integer from 1 to 16 If the parameter i 1 the record length is 1k 1024 If i 2 the record length is 2k 2048 and so on The maximum value of i is 16 for a maximum record length of 16k 16 384 RSCN i The RSCN command sets or reads the records per scan The records per scan is the number of records which will be accumulated The records scan may be programmed from 0 i 65535 When set to 0 ac c...

Page 84: ... The LEFT parameter will be affected LEFT i The LEFT command sets or reads the number of the bin at the left edge of the screen The LEFT i command translates the graph horizontally to place bin i at the left edge The parameter i may range from 0 to the number of bins per record minus the number of bins per screen i e the graph may not be translated to display a bin which is beyond the end of the r...

Page 85: ...oceed in a 1 2 5 10 sequence The value of x is rounded down to the nearest al lowed scale There is no practical maximum value for x the graph simply compresses to a line However there is a minimum value of x which de pends upon the range of the data maximum data value minimum data value Because the floating point data is single precision the minimum value of x is 0 07 of the range of the data The ...

Page 86: ... is in the range 1 i 31 DYRS i The DYRS command sets or reads the years setting of the calendar The value of i is in the range 0 i 99 PLTM i The PLTM command sets or reads the plotter mode If i 0 plotting is di rected to the RS232 interface if i 1 plotting is to the GPIB interface PLTB i The PLTB command sets or reads the RS232 plotter baud rate The pa rameter i ranges from 0 to 4 and selects baud...

Page 87: ...he FNAM string command before any file operation commands For example FNAM MYDATA DAT will set the active file name to MYDATA DAT DOS file name conventions must be followed i e file names are 8 characters or less with an optional extension of up to 3 characters Subdirectories are not supported All file access is to the root directory SVTR The SVTR command saves the current display memory data sett...

Page 88: ... invalid and an execution error may result The FITS command uses the limits set by LLIM and RLIM and not the front panel limits Conversely the front panel Do Fit function uses the on screen limits and not the LLIM and RLIM limits Using the View Parameters function will display the most recent fit parameters whether the fit was performed from the front panel or from the computer interface PARS i Th...

Page 89: ... file op eration commands For example FNAM MYDATA DAT will set the active file name to MYDATA DAT DOS file name conventions must be followed i e file names are 8 characters or less with an optional exten sion of up to 3 characters Subdirectories are not supported All file ac cess is to the root directory STAT The STAT command starts the statistical calculations Only the data with in the region spe...

Page 90: ...ates a plot of the entire screen Each feature uses the pen assigned in the Setup Plotter menu PTRC The PTRC command plots only the data trace PCUR The PCUR command plots the cursor markers if the cursor is presently displayed on the screen DATA ACQUISITION CONTROL COMMANDS SSCN The SSCN command has the same effect as pressing the START key The SSCN command only has an effect when the unit is pause...

Page 91: ...te and will be transferred to the display buffer when the BINA transfer is complete BINB The BINB query reads the entire display memory data record in binary format over the GPIB interface The BINB command is not available over the RS232 interface The BINB command may only be used if the data is integer count data If the data has been converted to floating point BINB will cause an error BINB retur...

Page 92: ... i The ESE i command sets the standard status byte enable register to the decimal value i 0 255 The ESE command queries the value of the status byte enable register ESR i The ESR query reads the value of the standard status byte The value is returned as a decimal number from 0 to 255 If the parameter i 0 7 is included the value of bit i is returned Reading the entire byte will clear it while readi...

Page 93: ...wn The PSC command determines which action will be taken SERIAL POLL bit name usage STATUS BYTE 0 Scan Ready No scan data acquisition in progress 1 Interface Ready No command execution in progress 2 Error An unmasked bit in the error status byte has been set 3 MCS An unmasked bit in the MCS status byte has been set 4 MAV The interface output buffer is non empty 5 ESB An unmasked bit in the standar...

Page 94: ...ed primarily to report errors in com mands received over the communications interfaces The bits in this register remain set until cleared by read ing them or by the CLS command MCS STATUS BYTE bit name usage 0 Triggered Set when a record is triggered 1 Plot Complete Set when a plot is completed 2 Print Complete Set when a print screen operation is completed 3 Toggled Set when the accumulate mode t...

Page 95: ...etected 3 Disk Error Set when an error occurs during a disk or file operation 4 Unused 5 Clock Unlock Set when the internal bin clock time base is not valid 6 Rate Error Set when a trigger arrives while the previous record is still being acquired or accumulated 7 Overflow Set when the count in any bin overflows during acquisition or accumulation The Error Status bits stay set until cleared by read...

Page 96: ... integer data point for bin 0 50 2 byte integer data point for bin 1 continues until last data point in record If the trace file represents integer count data the data points are simply 2 byte integers which are the counts in each bin If the file was saved as floating point data after a CALC function then the data is stored differ ently Each data point is stored as a 2 byte integer which can be co...

Page 97: ...96 Remote Programming ...

Page 98: ...ET DATA MEMORY 210 PRINT 1 WRT 220 230 WRT SSCN START SCAN WITH NEXT TRIGGER 240 PRINT 1 WRT 250 260 WRT STB READ SERIAL POLL STATUS BYTE 270 PRINT 1 WRT 280 INPUT 1 SP 290 IF SP MOD 2 0 GOTO 270 WHILE SCAN IS IN PROGRESS 300 310 FOR I 1 TO 1024 STEP 1 READ 1024 DATA POINTS 320 PRINT 1 BINA I 1 USING BINA 330 INPUT 1 BIN 340 PRINT I BIN 350 NEXT I 360 400 STOP IBM PC IBM BASIC using the RS232 inte...

Page 99: ...98 98 Program Examples ...

Page 100: ...R430 will be set to GPIB address 8 whenever a reset is performed power on with the CLR key down Make sure that you follow all the instructions for installing the GPIB card The National Instruments card can not be simply unpacked and put into your computer To configure the card you must set jumpers and switches on the card to set the I O address and interrupt levels You must run the program IBCONF ...

Page 101: ...str 20 tstr ibcnt 0 Terminate Received String printf Trigger Level s n tstr ibwrt sr430 CLRS 4 Reset SR430 to Clear state clear data memory ibwrt sr430 SSCN 4 Start Scan next trigger starts scan do ibrsp sr430 sp Check Status using serial poll while sp 1 While Scan is still in progress ibwrt sr430 BINB 5 Dump the Scan ibrd sr430 char buff 2048 Read 2048 bytes back from SR430 each point is 2 bytes ...

Page 102: ...210 WRT OUTP 1 DIRECT SR430 OUTPUT TO GPIB INTERFACE 220 CALL IBWRT SR430 WRT 230 240 WRT BREC 1 SET RECORD LENGTH TO 1024 BINS 250 CALL IBWRT SR430 WRT 260 270 WRT TRLV 5 SET TRIGGER LEVEL TO 5 VOLTS 280 CALL IBWRT SR430 WRT 290 300 WRT TRLV QUERY TRIGGER LEVEL 320 CALL IBWRT SR430 WRT 330 350 S SPACE 20 PRINT TRIGGER LEVEL RESPONSE 360 CALL IBRD SR430 S 370 PRINT Trigger Level S 380 390 WRT CLRS...

Page 103: ...ND BINB COMMAND TO BINARY DUMP THE DATA 530 540 CALL IBRDI SR430 BUF 0 CNT READ 2048 BYTES INTO INTEGER ARRAY BUF 550 560 FOR I 1 TO 1024 STEP 1 PRINT DATA RECORD TO SCREEN 570 PRINT I BUF I 580 NEXT I 590 600 STOP 1000 PRINT CANNOT FIND DEVICE MCS 1010 STOP ...

Page 104: ... pulses such that they always occur right on a bin boundary In that case even though no counts are lost there will be some variation as to which bin each pulse goes into Use a slightly longer cable or add a short length of cable to delay the pulses away from the bin boundaries In either case the total number of counts should be correct Clear the data using the STOP key Select a bin width of 5 ns P...

Page 105: ... adding cable delay to the TEST cable can also move the pulses into new bins In this way every bin can be tested eventually Once these tests are completed any bin width up to 327 µs and any record length can be tested Re member that the TEST pulses come every 20 ns and that the first bin will always receive 1 less count per trigger than the rest of the bins Also for longer record times the 1 kHz t...

Page 106: ...he unit is plugged in Please be careful Turn the power off disconnect the power cord wait two minutes then remove the top cover of the chassis Plug the unit back in and turn on the pow er SIGNAL INPUT OFFSET To calibrate the input offset connect a voltmeter to the signal input P101 adjusts the voltage which is output from the signal input This output voltage should be set to 0V The potentiometer i...

Page 107: ...106 106 Test and Calibration ...

Page 108: ...um ef ficiency over the wavelength region of interest GAIN AND RISETIME It is important to select a PMT with sufficient gain and short enough risetime to produce a detecta ble pulse for counting In addition the risetime is an important figure of merit to determine the maxi mum count rate for the tube The criteria for a detectable pulse depends on the electrical noise environment of your laboratory...

Page 109: ... the pulse height of the detected signal Since statistical fluctuations in pulse height are caused by the low gain of the first few stages of the multiplier chain increasing the gain of these stages will reduce pulse height variations and so improve the plateau characteristics of the PMT To increase the gain of the first few stages the resis tor values in the bias chain are tapered to increase the...

Page 110: ...he dynodes of a PMT may cause high frequency ringing of the anode output signal This can cause multiple counts for a single photon The problem is significantly reduced by using small re sistors between the dynodes and the bypass ca pacitors as shown in Figure B SNUBBING Snubbing refers to the practice of adding a net work to the anode of the PMT to improve the shape of the output pulse for photon ...

Page 111: ... 1 Taper voltage divider for higher gain in first stages 2 Bypass last few dynodes in pulsed applica tions 3 Use a snubber circuit to shape the output pulse CATHODE SHIELDING Head on PMT s have a semitransparent photoca thode which is operated at negative high voltage Use care so that no objects near ground potential contact the PMT near the photocathode MAGNETIC SHIELDING Electron trajectories in...

Page 112: ... sources such as preamp noise and EMI pickup There are two reasons for carefully selecting the input discriminator level The first is to improve the signal to noise ratio by setting the discriminator level above most of the noise pulses but below most of the signal pulses The second reason is to reduce drift if the discriminator threshold is set to the middle of the signal pulse height distributio...

Page 113: ...112 112 Using Photomultiplier Tubes ...

Page 114: ...des are by passed and 100 Ohm resisters are used between the dynodes and their bypass capacitors to reduce ringing in the anode signal A snubber network consisting of a 10 inch piece of RG174 terminated into 20 Ohms is used to further reduce anode ring ing and reduce the falltime of the output current pulse OPERATION The PMT is operated at the maximum rated high voltage 1250 Vdc The output pulses ...

Page 115: ...per level are counted by the SR430 INSTRUMENT CONFIGURATION The multichannel scaler is triggered by the same pulse which flashes the LED The bin width is 20 48 µs and the record length is 1k bins The records per accumulation is set to 100 Thus each record takes approximately 21 ms of real time to acquire which is sufficient to measure the 3 5 ms lifetime of the excited state The pulse rate of 40 H...

Page 116: ...s OFF If the LED is ON then DO NOT attempt any service on the unit This unit is to be serviced by qualified service personnel only There are no user serviceable parts inside CIRCUIT BOARDS The SR430 has five main printed circuit boards The five boards shown above contain all of the ac tive circuitry of the unit A sixth front panel circuit board not shown only has keypad contacts print ed on it and...

Page 117: ...eral chip select strobes are used by peripherals on the CPU board PCS0 is decoded into 16 IO strobes which access the clock keypad keyboard knob printer port etc PCS1 decodes the disk controller the GPIB con troller and DMA acknowledge strobes PCS2 se lects the UART and PCS3 selects the video graphics controller Whenever the video controller is accessed the ARDY line is asserted U504A which puts t...

Page 118: ...ired for the display the 16 bits of data are latched into U804 and U809 which are parallel to serial converters The video data is then shifted out at 13 5 MHz and synchronized by U806B U803C blanks the video data except during active display times Memory is accessed twice during each display cy cle The first access reads the 16 bits of video data for the current display cycle The second ac cess is...

Page 119: ...The power switch simply switches the power to U9 When U9 is off the reference voltage is removed and the regula tors drop to zero volts There are 2 5V supplies one to power the CPU board and disk drive 5V_P and one to power the ECL and TTL data acquisition boards 5V_I The following description refers to the 5V_P sup ply but describes the 5V_I 5 2V and 2V sup plies as well The main pass transistor ...

Page 120: ...nal to the phase comparator U304 A 25 MHz crystal oscillator divided by 8 in U306 is the reference signal for U304 The output of the phase comparator is filtered and integrated by U305 to drive the frequency control input of the 200 MHz oscillator D301 The net result is a 200 MHz crys tal based time base available from U301C The discriminated trigger input clocks latch U311A The latched trigger is...

Page 121: ...the first pulse has propagated through U702B no matter when the pulse arrived Thus pulses are latched into U702A until they are cap tured by U702B All pulses clocked into U702B will be counted U703A is also clocked by the 200 MHz clock When its output and the output of U702B are dif ferent then a pulse has been detected and the output of U701C goes high If no other pulses ar rive U701C goes low af...

Page 122: ...for longer bin widths when the store and reset times are longer While the record is being ac quired U806 multiplexes the memory write signals to the fast buffer memories FAST BUFFER ADDRESS COUNTER Addresses for the fast buffers are generated by counters U908 U911 Before the trigger is armed the processor loads the number of bins in a record divided by 2 into the counter While data is being acquir...

Page 123: ...at the sign of the output is correct Accumulation pro ceeds as above with the new data being 1 or 0 only U1017 and U1018 are 32kbyte copy buffers which interface to the processor While data is accumu lating U1017 and U1018 can copy an image of the accumulation buffer U1014 and U1015 enable the adder outputs onto U1017 and U1018 s data bus The address to these buffer RAMs comes from a counter simil...

Page 124: ...via the expansion connector DIGITAL TO ANALOG CONVERTER U1602 is a 12 bit D A converter which is loaded 4 bits at a time by the processor The voltage output from U1603A is 0 to 5 12V U1603B shifts and scales this output to provide 2 to 2 V U1604 multiplexes this output to 4 sample and hold ampli fiers ...

Page 125: ...124 124 124 Circuit Description ...

Page 126: ...talum 35V 20 Rad C 901 5 00003 501 10P Capacitor Ceramic Disc 50V 10 SL C 902 5 00003 501 10P Capacitor Ceramic Disc 50V 10 SL C 903 5 00061 513 001U Capacitor Mylar Poly 50V 5 Rad C 904 5 00223 513 027U Capacitor Mylar Poly 50V 5 Rad C 905 5 00068 513 047U Capacitor Mylar Poly 50V 5 Rad C 906 5 00061 513 001U Capacitor Mylar Poly 50V 5 Rad C 907 5 00012 501 330P Capacitor Ceramic Disc 50V 10 SL C...

Page 127: ...r Ceramic 50V 80 20 Z5U AX C 1037 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 1038 5 00100 517 2 2U Capacitor Tantalum 35V 20 Rad C 1039 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 1040 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 1041 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 1042 5 00100 517 2 2U Capacitor Tantalum 35V 20 Rad C 1043 5 0022...

Page 128: ...rbon Film 1 4W 5 R 701 4 00088 401 51K Resistor Carbon Film 1 4W 5 R 702 4 00021 401 1 0K Resistor Carbon Film 1 4W 5 R 703 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 704 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 705 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 706 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 707 4 00063 401 3 0K Resistor Carbon Film 1 4W 5 R 708 4 00035 401 10M Resistor ...

Page 129: ...3 00049 340 74HC74 Integrated Circuit Thru hole Pkg U 611 3 00049 340 74HC74 Integrated Circuit Thru hole Pkg U 612 3 00039 340 74HC14 Integrated Circuit Thru hole Pkg U 701 3 00051 340 74HCU04 Integrated Circuit Thru hole Pkg U 702 3 00349 340 MC146818P Integrated Circuit Thru hole Pkg U 703 3 00300 340 74LS374 Integrated Circuit Thru hole Pkg U 704 3 00263 340 DS75451N Integrated Circuit Thru ho...

Page 130: ...eramic Disc 50V 10 SL C 12 5 00002 501 100P Capacitor Ceramic Disc 50V 10 SL C 13 5 00002 501 100P Capacitor Ceramic Disc 50V 10 SL C 14 5 00002 501 100P Capacitor Ceramic Disc 50V 10 SL C 15 5 00027 503 01U Capacitor Ceramic Disc 50V 20 Z5U C 16 5 00027 503 01U Capacitor Ceramic Disc 50V 20 Z5U C 17 5 00027 503 01U Capacitor Ceramic Disc 50V 20 Z5U C 18 5 00027 503 01U Capacitor Ceramic Disc 50V ...

Page 131: ...Wire Wound F 2 4 00436 409 1 Resistor Wire Wound F 3 4 00436 409 1 Resistor Wire Wound F 4 4 00436 409 1 Resistor Wire Wound J 1 1 00114 116 10 PIN WHITE Header Amp MTA 156 JP1 1 00039 116 5 PIN WHITE Header Amp MTA 156 JP2 1 00116 130 4 PIN DI DISK Connector Male JP3 1 00119 116 3 PIN WHITE Header Amp MTA 156 JP4 1 00117 116 20 PIN WHITE Header Amp MTA 156 PC1 7 00262 701 002 Printed Circuit Boar...

Page 132: ... R 33 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 34 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 35 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 36 4 00034 401 10K Resistor Carbon Film 1 4W 5 R 38 4 00081 401 470 Resistor Carbon Film 1 4W 5 R 39 4 00149 407 121 Resistor Metal Film 1 8W 1 50PPM R 40 4 00179 407 30 1K Resistor Metal Film 1 8W 1 50PPM R 41 4 00138 407 10 0K Resistor Metal Film 1...

Page 133: ...7 021 4 40X1 4PP Screw Panhead Phillips Z 0 0 00231 043 4 SHOULDER Washer nylon Z 0 0 00246 043 8 X 1 16 Washer nylon Z 0 0 00309 021 8 32X1 4PP Screw Panhead Phillips Z 0 0 00316 003 PLTFM 28 Insulators Z 0 7 00285 721 PLTFM 21 Machined Part Z 1 0 00158 000 60MM 24V Hardware Misc ECL LOGIC BOARD REF SRS part VALUE DESCRIPTION C316 5 00215 501 20P Capacitor Ceramic Disc 50V 10 SL C 1 5 00100 517 2...

Page 134: ...acitor Ceramic 50V 80 20 Z5U AX C 104 5 00159 501 6 8P Capacitor Ceramic Disc 50V 10 SL C 105 5 00033 520 47U Capacitor Electrolytic 16V 20 Rad C 106 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 107 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 108 5 00033 520 47U Capacitor Electrolytic 16V 20 Rad C 109 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 110 5 00033 ...

Page 135: ...amic 50V 80 20 Z5U AX C 702 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 703 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 704 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 1501 5 00012 501 330P Capacitor Ceramic Disc 50V 10 SL CX403 5 00003 501 10P Capacitor Ceramic Disc 50V 10 SL D 101 3 00202 301 MSD6100 Diode D 102 3 00203 301 1N5711 Diode D 103 3 00203 301...

Page 136: ...325 2N5770 Transistor TO 92 Package R 101 4 00374 407 51 1 Resistor Metal Film 1 8W 1 50PPM R 102 4 00347 407 7 50K Resistor Metal Film 1 8W 1 50PPM R 103 4 00347 407 7 50K Resistor Metal Film 1 8W 1 50PPM R 104 4 00348 407 2 21K Resistor Metal Film 1 8W 1 50PPM R 105 4 00088 401 51K Resistor Carbon Film 1 4W 5 R 106 4 00079 401 4 7K Resistor Carbon Film 1 4W 5 R 107 4 00322 407 316 Resistor Metal...

Page 137: ...r Carbon Film 1 4W 5 R 239 4 00031 401 100 Resistor Carbon Film 1 4W 5 R 240 4 00021 401 1 0K Resistor Carbon Film 1 4W 5 R 241 4 00103 401 820 Resistor Carbon Film 1 4W 5 R 242 4 00021 401 1 0K Resistor Carbon Film 1 4W 5 R 243 4 00103 401 820 Resistor Carbon Film 1 4W 5 R 301 4 00076 401 390 Resistor Carbon Film 1 4W 5 R 302 4 00076 401 390 Resistor Carbon Film 1 4W 5 R 303 4 00065 401 3 3K Resi...

Page 138: ... hole Pkg U 312 3 00194 340 MC10H131 Integrated Circuit Thru hole Pkg U 313 3 00194 340 MC10H131 Integrated Circuit Thru hole Pkg U 314 3 00359 340 MC10H125 Integrated Circuit Thru hole Pkg U 401 3 00206 340 MC10H102 Integrated Circuit Thru hole Pkg U 402 3 00194 340 MC10H131 Integrated Circuit Thru hole Pkg U 403 3 00194 340 MC10H131 Integrated Circuit Thru hole Pkg U 404 3 00194 340 MC10H131 Int...

Page 139: ... 340 MC10H125 Integrated Circuit Thru hole Pkg U 713 3 00356 340 74F374 Integrated Circuit Thru hole Pkg U 714 3 00356 340 74F374 Integrated Circuit Thru hole Pkg U 1501 3 00200 340 MC10124 Integrated Circuit Thru hole Pkg U 1502 3 00200 340 MC10124 Integrated Circuit Thru hole Pkg U 1503 3 00200 340 MC10124 Integrated Circuit Thru hole Pkg Z 0 0 00025 005 3 8 Lugs Z 0 0 00089 033 4 Tie Z 0 0 0012...

Page 140: ...mic 50V 80 20 Z5U AX C 36 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 37 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 38 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 39 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 40 5 00100 517 2 2U Capacitor Tantalum 35V 20 Rad C 41 5 00225 548 1U AXIAL Capacitor Ceramic 50V 80 20 Z5U AX C 42 5 00225 548 1U AX...

Page 141: ...241 701 SR430 TTL Printed Circuit Board Q 1001 3 00026 325 2N5210 Transistor TO 92 Package Q 1002 3 00026 325 2N5210 Transistor TO 92 Package R 801 4 00041 401 150 Resistor Carbon Film 1 4W 5 R 901 4 00027 401 1 5K Resistor Carbon Film 1 4W 5 R 902 4 00041 401 150 Resistor Carbon Film 1 4W 5 R 903 4 00041 401 150 Resistor Carbon Film 1 4W 5 R 904 4 00041 401 150 Resistor Carbon Film 1 4W 5 R 1001 ...

Page 142: ...Integrated Circuit Thru hole Pkg U 1009 3 00362 340 74F283 Integrated Circuit Thru hole Pkg U 1010 3 00356 340 74F374 Integrated Circuit Thru hole Pkg U 1011 3 00356 340 74F374 Integrated Circuit Thru hole Pkg U 1012 3 00299 341 32KX8 100L STATIC RAM I C U 1013 3 00299 341 32KX8 100L STATIC RAM I C U 1014 3 00046 340 74HC374 Integrated Circuit Thru hole Pkg U 1015 3 00046 340 74HC374 Integrated Ci...

Page 143: ...1007 Strip 1 4x1 4 Tin Z 0 0 00149 020 4 40X1 4PF Screw Flathead Phillips Z 0 0 00168 023 6 32X5 16R Screw Roundhead Phillips Z 0 0 00187 021 4 40X1 4PP Screw Panhead Phillips Z 0 0 00190 030 8X1 Spacer Z 0 0 00210 020 4 40X5 16PF Screw Flathead Phillips Z 0 0 00212 021 6 32X2PP Screw Panhead Phillips Z 0 0 00241 021 4 40X3 16PP Screw Panhead Phillips Z 0 0 00248 026 10 32X3 8TRUSSP Screw Black Al...

Page 144: ...ibbon Z 0 1 00138 130 5 PIN SI Connector Male Z 0 1 00141 171 5 PIN SIL Cable Assembly Ribbon Z 0 1 00183 171 20 COND Cable Assembly Ribbon Z 0 1 00193 131 12 PIN SIF Connector Female Z 0 2 00023 218 DPDT Switch Panel Mount Power Rocker Z 0 2 00034 220 ENA1J B20 SOFTPOT Z 0 2 00035 222 SAS50B Thermostat Z 0 4 00649 455 100K Trim Pot Cond Plastic PC Mount Z 0 4 00681 436 SG240 Thermistor ICL Inrush...

Page 145: ...ROM PROM I C Z 0 0 00159 000 FAN GUARD Hardware Misc Z 0 0 00179 000 RIGHT FOOT Hardware Misc Z 0 0 00180 000 LEFT FOOT Hardware Misc Z 0 0 00185 021 6 32X3 8PP Screw Panhead Phillips Z 0 0 00204 000 REAR FOOT Hardware Misc Z 0 0 00223 029 6 32X3 8TR PH Screw Truss Phillips Z 0 0 00248 026 10 32X3 8TRUSSP Screw Black All Types Z 0 0 00259 021 4 40X1 2 PP Screw Panhead Phillips Z 0 0 00315 021 6 32...

Page 146: ...o find low density disks DS DD However there is a quick and easy way to convert a high density disk to a low density one Just follow the procedure below 1 Orient the high density disk so that the label side is facing up and the metal slider is facing down Notice there are two small rectangular holes on the top of the floppy disk 2 Use a single piece of sturdy tape must be opaque to cover both side...

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