Page 1 Multichannel Scaler/Averager SR430 odel 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 3: Table Of Contents
Specifications BNC Connectors Quick Performance Check MENUS Abridged Command List Levels Menu INSTRUMENT OVERVIEW Mode Menu SR430 Overview Display Menu Trigger and Sync/Busy Setup Menu Bin Clock Output Save Menu Ext Bin Clk Input Recall Menu Signal Input and Discriminator...
Page 4 Printer Interface File Formats Trace File Video Graphics Interface Settings File Disk Controller GPIB Interface Program Examples RS232 Interface IBM PC BASIC, RS232 Expansion Connector Microsoft C, Nat'l Instruments GPIB 99 IBM PC BASIC, Nat'l Instruments GPIB Power Supply Board Unregulated Power Supplies TEST AND CALIBRATION Power Supply Regulators...
Page 5: Safety And Preparation For Use
The signal inputs may be damaged if a photomulti- plier is used improperly with the photon counter. The SR430 operates from a 100V, 120V, 220V, or When left completely unterminated, a PMT will charge a cable to a few hundred Volts in a very 240V nominal ac power source having a line fre- short time.
Page 7: Specifications
GPIB and RS-232 in- terfaces. The SR430 is also easy to use. It has a menu based user interface which makes front-panel adjust- ments intuitive and straightforward. Entries are made with the front-panel knob or numeric keypad. On screen help is available at all times.
Page 8 SR430 Multichannel Scaler Protection 15 VDC, 100 V for 1 µs INTERNAL TIME BINS Bin width 5 ns, 40 ns, 80 ns, 160 ns, 320 ns, 640 ns, 1.28 µs, 2.56 µs, ... 10.486 ms. (10 ns or 20 ns bins are not available)
Page 9 SR430 Multichannel Scaler Output current rating 10 mA Output impedance < 1 Ω Accuracy 0.1% + 10 mV INPUTS SIGNAL Analog 50 Ω input. TRIGGER 10 k Ω input. BIN CLK INPUT TTL input. Rising edge triggers next time bin ACCUMULATOR INHIBIT TTL input, sampled each trigger.
Page 10: Quick Performance Check
This setup requires a 1 Hz to 2 kHz TTL trigger source. A simple function generator will suffice. Hold down the CLR key while turning the unit on. This resets the SR430 to its default state. Connect the trigger source to the TRIGGER input on the front panel. Set the Trigger Level and Slope in the LEVELS menu appropriately for the trigger source.
Page 11 SR430 Multichannel Scaler COMMAND LIST LEVELS TRLV(?) {x} Set the Trigger Level to -2.000 <= x <= 2.000 V. TRSL(?) {i} Set the Trigger Slope to Positive (0) or Negative (1). DCLV(?) {x} Set the Discriminator Level to -0.3000 <= x <= 0.3000 V.
Page 12 Read the entire data record in binary format. INTERFACE *RST Reset the unit to its default configurations. *IDN? Read the SR430 device identification string. LOCL(?) {i} Set the Local/Remote state to LOCAL (0), REMOTE (1), or LOCAL LOCKOUT (2). STATUS *CLS Clear all status registers.
Page 13: Instrument Overview
(4 * 10 ns = 40 ns). If the bins width is 5 ns, then the maximum number of counts per bin is 1. The The SR430 data acquisition timing is diagrammed maximum count capacity of each bin is 32,767.
Page 14: Trigger And Sync/Busy
One way to accomplish this is to trig- bin boundaries. When the bin width mode is pro- ger the SR430 with the experiment's master rate grammed to EXTERNAL, the EXT BIN CLK will generator and use the SYNC/BUSY (which is de- clock the bins.
Page 15: Timing
Instrument Overview polarity may be detected. ber of time bins in a single record. Each trigger will take N data points corresponding to N sequential The discriminator output is labelled DISC OUT on time bins. N may be programmed from1024 to the front panel.
Page 16 TOGGLE will switch between ADD and SUB- ed directly connected to the RS232 or GPIB inter- TRACT every M records where M is programma- face. Data will be plotted directly from the SR430 ble. In this mode, the rear panel TOGGLE OUT- without a computer.
Page 17: Front Panel Overview
Video Display Front Panel BNC Connectors POWER BUTTON The SR430 is turned on by pushing in the POWER The main area of the display is occupied by the button. The video display may take a few seconds data display. Data is graphed as accumulated to warm up and become visible.
Page 18: Keypad
The disk capacity is 720k bytes active only when SYNC/BUSY is active. formatted. The disk format is DOS compatible. Disks written by the SR430 may be read by PC EXT BIN CLK INPUT compatible computers equipped with a 3.5" drive The EXT BIN CLK is a TTL input whose rising and DOS 3.0 or higher.
Page 19: Screen Display
Guide To Operation SCREEN DISPLAY Cursor Position and data Soft Key Definitions. Pressing the Data Acquisition value. When surrounded by a status (CLR, BUSY, corresponding soft key will either box, indicates that the knob PAUSE, or DONE). highlight a field or select an option. will move the cursor region.
Page 20: Cursor Display
Guide To Operation scaling, each X screen location may represent The Right most displayed bin and time is the X multiple data points. The cursor marker can still value of the right edge of the graph. These values seek the min, max, or mean of the data at a single represent the X scale and translation.
Page 21: Status Indicators
This indicator turns on when a GPIB Service Re- acters into the active entry field. To return to the quest is generated by the SR430. SRQ stays on normal keypad, press the [ALT] key again. until a serial poll of the SR430 is completed.
Page 22 Guide To Operation...
Page 23: Keypad
Guide To Operation KEYPAD CONTROL SYSTEM START STOP CURSOR AUTO PRINT HELP RESET SCALE ENTRY MENU PEAK LEVELS MODE CENTER DISPLAY SETUP NORM SAVE MATH RECALL PLOT • ENTER TEST INFO state are ignored and SYNC/BUSY and BIN CLK NORMAL AND ALTERNATE KEYS OUT are inactive.
Page 24: Menu Keys
Trigger Level Y = 50 cnts 500 mV All operating parameters of the SR430 are grouped into ten function menus. The ten menu keys select which menu of parameters is dis- played next to the six soft keys. The soft keys then...
Page 25: Peak
Guide To Operation the description of the MATH menu for more infor- 727.0 µsec mation about floating point representations of the bin 71 Trigger Level data. Data may be restored to the original count Y = 50 cnts data using the [REACQUIRE] function in the 500 mV MODE menu.
Page 26 Guide To Operation...
Page 27: Rear Panel
Refer to the first page of this manual for in- grammed from the SETUP RS232 menu. To con- structions on selecting the correct line voltage and nect the SR430 to a PC serial adapter, which is fuse. usually a DTE, use a straight thru serial cable.
Page 28: Pc Keyboard Connector
Guide To Operation what the accumulation mode of the next record will PC KEYBOARD CONNECTOR be. This output is only used if the accumulation mode is set to TOGGLE. TOGGLE switches at the A n IBM PC or XT compatible keyboard may be at- end of the SYNC/BUSY time to reflect the accu- tached to the keyboard connector.
Page 29: Levels Menu
LEVELS MENU Introduction The Levels menu is used to set the trigger and discriminator settings as well as the Aux output levels. Trigger Level LEVELS 500 mV Trigger Level Trigger Slope Trigger Slope Disc. Level Discriminator Level -10.0 mV Disc. Slope Discriminator Slope Aux 1 Level Aux.
Page 30 Levels Menu slope should be set to falling. If the signal pulses are positive going, then slope should be rising. In either case, the Disc. Output is always active low; i.e., a discriminated rising edge of the signal will be output as a neg- ative going NIM pulse at the Disc.
Page 31: Mode Menu
MODE MENU Introduction 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.
Page 32 Mode Menu Bin Width This key is activated only when the Bin Clock Source is Internal. Press- ing this key will activate the internal bin width entry field. The bin width may only be adjusted using the knob. The available bin widths are 5ns, 40ns, 80ns,160 ns, ...
Page 33 Mode Menu The Trigger Offset entry field accepts numeric entry or knob adjustments. The resolution is 16 bins and the limit is 16,320 bins. Below the entry field, the actual time corresponding to the trigger offset is displayed. This is simply the Trigger Offset (in bins) multiplied by the bin width. The Trigger Offset is used when the data of interest occurs long after the trigger and short bin widths are required for resolution.
Page 34 Mode Menu Toggle Count This key is active only if the Accumulate Mode is set to Toggle. The Tog- gle Count is the number of records accumulated in one mode (add or subtract) before switching to the opposite mode. For example, if the Tog- gle Count equals 4, then the first 4 records are added, the next 4 records are subtracted, the next 4 are added, etc.
Page 35 Mode Menu Data Acquisition Memory (32704) Total Acquired Data Trigger Offset Bins/Record (0 to 16320) (1024 to 16384) From Offset ReAcquired Display Memory (equal to Bins/Record) The From Offset value may be set from 0 to the Trigger Offset in incre- ments of 16 bins.
Page 36 Mode Menu...
Page 37: Display Menu
DISPLAY MENU Introduction The Display menu is used to change the graph parameters and cursor mode. Note that cursor movement is activated by the [CURSOR] key and not by this menu. Translate DISPLAY Translate Zoom Zoom Cursor Cursor On/Off Cursor Width Cursor Width Norm Wide...
Page 38 Display Menu and going up to 5000 counts/division (40000 counts full scale). This al- lows the full range of count data to be displayed. If the data is in floating point representation (as a result of a Math function), zooming in is limited by the 16 bit resolution of the data.
Page 39: Setup Menu
SETUP MENU Introduction The Setup menu is used to configure the printer, plotter and computer in- terfaces, and set the sound and clock/calendar parameters. Setup SETUP Commun. Communications Setup Sound Sound Setup Time Time Setup Plotter Plotter Printer Setup Printer Screen Setup Screen...
Page 40 Return Output To RS232/GPIB The SR430 only outputs data to one interface at a time. Commands may be received over both interfaces but responses are directed only to the interface selected by the Output To key. Make sure that the Output inter- face is set correctly before attempting to program the SR430 from a com- puter.
Page 41 To defeat this feature, set the Overide Remote ? to Yes. In this mode, no GPIB remote enable will put the unit into REMOTE state. If the SR430 is in the REMOTE state, the [HELP] key re- turns the unit to local front panel control. Return The Return key will return to the Setup Communications menu.
Page 42 Setup Menu View Queues The last 256 characters received or transmitted by the SR430 may be displayed to help find programming errors. The View Queues key will dis- play the interface buffers as they are when the key is pressed. This screen is updated regularly to display new interface activity.
Page 43 Setup Menu Setup Sound The Setup Sound key activates the sound sub menu. Key click and alarms are enabled and disabled in this sub menu. Key Click SETUP Sound Alarms Key Click On/Off Alarms On/Off Return Return: Key Click This key turns the key click on and off. Alarms This key enables and disables the audible alarms.
Page 44 Setup Menu Setup Time The Setup Time key activates the clock/calendar sub menu.The time and date are used to label all screen prints and plots as well as disk files. This menu is used to check or change the time and date. Time SETUP 09 : 10 : 23...
Page 45 Return 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 Plot Mode panel.
Page 46 Setup Menu Plot Mode RS-232 GPIB ter Address may be entered from the keypad or by using the knob. The Plotter Addr. Plotter Address must agree with the address of the plotter in use. Plot Speed Plot Speed This key toggles the Plot Speed. Normally, when plotting on paper, the Fast Plot Speed is used.
Page 47 Setup Menu Setup Printer The Setup Printer menu is used to select the type of printer attached to the parallel printer port. The [PRINT] key prints the screen to the printer. Printer Type SETUP Epson Printer Printer Type Return Return: Printer Type This function toggles the Printer Type between Epson and HP.
Page 48 Setup Menu Setup Screen The Setup Screen menu is used to adjust the position of the display on the screen. The display area may be moved left and right. Move SETUP Right: Screen Move Left: Move Right Move Left Return Return: Move Right This function moves the display to the right on the screen.
Page 49: Save Menu
SAVE MENU Introduction 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.
Page 50 To create a new file name, use the File Name key. Directory entries made by the SR430 also have a type field shown in the catalog display. Files with type SET are settings, type SYS are system, and type TRC are DONE 727.0 µsec...
Page 51 The file type is not an extension but is infor- mation stored in the 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.
Page 52 Return: stores the graph. Save System The Save System sub menu is used to save the SR430 system configu- ration. All parameters in the Setup menu are saved. Save System Pressing this key will save the current system informa-...
Page 53 Save Menu Disk Utilities The Disk Utilities sub menu contains the Format Disk and Erase File functions. These functions should be used with care since disk data will be erased. The catalog screen is displayed when in this sub menu. Format Disk Pressing this key will format the disk.
Page 54 Save Menu...
Page 55: Recall Menu
RECALL MENU 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 RECALL Trace:...
Page 56 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 DONE 727.0 µsec...
Page 57 The file type is not an extension but is infor- mation stored in the 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.
Page 58 Recall System The Recall System sub menu is used to read the SR430 system configu- ration from a disk file. All parameters in the Setup menu are read. Recall- ing System data does not affect any count data presently in memory.
Page 59 Recall Menu Disk Utilities The Disk Utilities sub menu contains the Format Disk and Erase File functions. These functions should be used with care since disk data will be erased. The catalog screen is displayed when in this sub menu. Format Format Disk Pressing this key will format the disk.
Page 60 Recall Menu...
Page 61: Math Menu
MATH MENU Introduction The Math menu is used to smooth, fit, change and analyze the data in the display memory. MATH Smooth: Smooth Fit: Calc Calc: Stats Stats: Math Keys Each Math Key activates a sub menu. Each sub menu is described in de- tail in the following pages.
Page 62 Math Menu menu. Once smoothed, the data remains in floating point form even when the Smooth menu is exited. If floating point data is saved to disk using the Save Trace function, it will be recalled as floating point data us- ing Recall Trace.
Page 63 Math Menu The Fit sub menu allows the user to fit one of three curves to the dis- played data: lines, exponentials, and Gaussians. Fitting is done using the Marquardt 'Gradient-expansion' algorithm to minimize chi-squared. Type of Fit MATH Line Exp.
Page 64 Math Menu like the one shown below. In this example screen, the fit is a line. The curve fit region is delimited by DONE bin 110 1.126 msec Type of Fit Y = 27 cnts Line Exp. Gauss. Do Fit: View Params: Left...
Page 65 Math Menu key to the desired location of the limit. Pressing the Left or Right Limit key will set the limit to the cursor position. The Limits are set each time a limit key is pressed. The limits are displayed as heavy dashed vertical lines as shown below. Return The Return key will return to the main Math menu.
Page 66 Math Menu Calc The Calculation sub menu allows the user perform simple arithmetic cal- culations with the displayed data. Operations are performed on the entire data record in display memory, regardless of graph scaling. Performing a calculation on the data will change the data from integer Performing a calculation on the data will change the data from integer count data...
Page 67 Math Menu Note that many operations will require an AutoScale to display the result on the graph. Operation Argument Type The Argument Type function selects between a constant argument and a data file on disk. A constant argument adds or subtracts a constant or log sqrt multiplies or divides by a constant.
Page 68 Math Menu Stats The Stats sub menu calculates a variety of statistical information about a display calculation region defined by the Left and Right Limits. MATH Do Stats: Stats Do Stats Left Limit: Left Limit Right Limit: Right Limit Return Return: Do Stats Pressing this key starts the actual calculation.
Page 69: Plot Menu
PLOT MENU Introduction The Plot menu is used to plot the screen display to an HPGL compatible plotter. Use the Setup Plotter menu to configure the plotter interface, plot speed, and pen definition. P l o t PLOT All: Plot All Plot Trace: Plot Trace...
Page 70 Plot Menu...
Page 71: Test Menu
TEST MENU Introduction The Test menu allows the user to test various features of the SR430 such as the keypad, knob, screen, memory, etc. To test the data acquisi- tion hardware, see the Test and Calibration section of the manual.
Page 72 Test Menu Knob Test This key activates the knob test screen. A circle with a marker is dis- played. Select one of the 4 speeds displayed in the menu. Turning the knob will cause the marker to move around the circle verifying knob ac- tion and direction.
Page 73 Test Menu More The More key activates the second Test menu described below. RS-232 Test Memory Test Screen Test Return: RS-232 Test Pressing this key activates the RS232 test screen. A special loop back adapter is required to complete this test. The loop back adapter is simply a mating connector with pins 2 and 3 connected so characters transmit- ted by the interface will be received by the instrument.
Page 74 Test Menu...
Page 75: Info Menu
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.
Page 76 Info Menu...
Page 77: Instrument Setups
INSTRUMENT SETUPS DEFAULT SETUP / POWER ON CLEAR If the [CLR] key is held down when the power is turned on, the instrument settings will be set to the defaults shown below instead of the settings in effect when the power was turned off. Menu Item Setting Menu Item...
Page 78: Choosing Bin Width & Record Length
The acquisition starts from the trigger time. The "convenient" combination is found. SR430 can acquire up to 32k bins in a single record at up to 10.486 ms per bin for a maximum record time of 343 seconds. In an experimental sit-...
Page 79 One way to accomplish this is to trig- ger the SR430 with the experiment's master rate generator and use the SYNC/BUSY (which is de- layed from trigger by only 45 ns) to trigger the ac-...
Page 80: Remote Programming
Multiple parameters are separated by commas (,). COMMUNICATING WITH RS232 Multiple commands may be sent on one command The SR430 is configured as a DCE ( transmit on line by separating them with semicolons (;). The pin 3, receive on pin 2) and supports CTS/DTR difference between sending several commands on hardware handshaking.
Page 81: Interface Ready And Status
INTERFACE READY AND STATUS The Interface Ready bit in the Serial Poll Status Byte signals that the SR430 is ready to receive and execute a command. When a command is re- ceived, this bit is cleared indicating that an opera- tion is in progress.
Page 82: Detailed Command List
Remote Programming DETAILED COMMAND LIST The four letter mnemonic in each command sequence specifies the command. The rest of the sequence con- sists of parameters. Multiple parameters are separated by commas. Parameters shown in { } are optional or may be queried while those not in { } are required. Commands that may be queried have a question mark in parentheses (?) after the mnemonic.
Page 83: Mode Control Commands
An execution error is generated if a Mode Control Command which attempts to change a mode parameter is received during BUSY, PAUSE, or DONE states. Use the serial poll status byte to determine if the SR430 is CLEAR. BCLK (?) {i} The BCLK command sets or reads the bin clock time base.
Page 84: Display Control Commands
The REAC command performs the ReAcquire function. The display buf- fer is restored with original count data from the data acquisition memory. Reacquire will only function when the SR430 is in the DONE state. ROFF (?) {i} The ROFF command sets or reads the ReAcquire From Offset value.
Page 85: Setup Commands
Remote Programming screen width in bins screen width in bins VSCL (?) {i} {x} The VSCL command sets or reads the vertical scale. Unlike vertical scal- ing from the front panel which takes place about the center of the screen, the VSCL i or VSCL x commands change the vertical scale while leaving the BOTM value unchanged.
Page 86 Remote Programming SETUP COMMANDS OUTP (?) {i} The OUTP command sets the output interface to RS232 (i=0) or GPIB (i=1). The OUTP i command should be sent before any query commands to direct the responses to the interface in use. KCLK (?) {i} The KCLK command sets or reads the key click on (i=1) or off (i=0) state.
Page 87: Save And Recall Commands
Remote Programming PNCR (?) {i} The PNCR command sets or reads the cursor pen number. The pen number is in the range of 1 to 6. PNFT (?) {i} The PNFT command sets or reads the fit pen number. The pen number is in the range of 1 to 6.
Page 88: Math Operation Commands
Remote Programming MATH OPERATION COMMANDS When using the math commands SMTH, FITS, CALC, and STAT, the status bytes should be queried after the command is sent to check if the command generated an error. Common sources of errors are divide by zero, math overflow or underflow, and file not on disk.
Page 89 Remote Programming record and i must be greater than the left limit set by LLIM. OPER (?) {i} The OPER command sets or reads the type of math operation selected. The parameter i selects the operation. operation sqrt CALC The CALC command starts the calculation selected by the OPER com- mand.
Page 90: Print And Plot Commands
Remote Programming PRINT AND PLOT COMMANDS When using the print or plot commands, the status bytes should be queried after the command is sent to check if the command generated an error. Common sources of errors are printer/plotter not connected and printer/plotter interface incorrectly configured.
Page 91: Data Transfer Commands
Remote Programming DATA TRANSFER COMMANDS BINA? {i} The BINA? query reads the display memory record data in ASCII format. If the parameter i is included, only the value of the data in bin #i is re- turned. The first bin is i=0 and the last bin is i=bins/record-1. If the pa- rameter i is omitted, then the entire record of data is returned.
Page 92: Interface Control Commands
LOCL i The LOCL command sets the RS232 local/remote function. If i=0 the SR430 is LOCAL, if i=1 the SR430 will go REMOTE, and if i=2 the SR430 will go into LOCAL LOCKOUT state. The states duplicate the GPIB local/remote states. In the LOCAL state both command execution and keyboard input are allowed.
Page 93: Status Byte Definitions
STATUS BYTE DEFINITIONS The SR430 reports on its status by means of four status bytes: the serial poll byte, the standard status byte, the MCS status byte, and the error status byte.
Page 94: Mcs Status Byte
Remote Programming mands received at once, queues cleared) Unused Query Error Set on output queue overflow (too many re- sponses waiting to be transmitted, queues cleared) Unused Execution Error Set when a command can not execute correctly or a parameter is out of range Command Error Set when an illegal command is received Set by any key press or knob rotation...
Page 95: Error Status Byte
Remote Programming ERROR STATUS BYTE name usage Plot Error Set when an error occurs during plotting Print Error Set when an error occurs during a print screen operation Memory Error Set when a memory error is detected Disk Error Set when an error occurs during a disk or file operation Unused Clock Unlock...
Page 96: Trace File
FILE FORMATS The formats of the files stored by the SR430 are described below. Disks written by the SR430 may be read on a MSDOS computer with a 3.5" disk drive. However, the files are not stored as ASCII files. They cannot be simply typed on the screen.
Page 97 Remote Programming...
Page 98: Program Examples
PROGRAM EXAMPLES IBM PC, IBM BASIC using the RS232 interface In this example, the IBM PC serial port COM1: is used at 9600 baud. Configure the SR430 to 9600 baud, 8 bits, no parity before running the program. To read the data record over the RS232 interface, the BINA? n command is used to read points individually.
Page 99 Program Examples...
Page 100 SETUP menu. The default GPIB address is 8; use this address unless a conflict occurs with other instruments in your system. The SR430 will be set to GPIB address 8 whenever a reset is performed (power on with the [CLR] key down).
Page 101 /* 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) */ for (i=0; i<1024; i++) /* Print data record to screen */ printf("Bin = %d Count= %d\n",i,buff[i]);...
Page 102 10 ' EXAMPLE PROGRAM USING MICROSOFT BASIC AND THE NATIONAL INSTRUMENTS GPIB CARD 20 ' THIS PROGRAM ASSUMES THAT A TTL TRIGGER SOURCE IS CONNECTED TO THE TRIGGER IN- 30 ' THIS PROGRAM ASSUMES THAT THE SR430 IS INSTALLED AS DEVICE MCS USING IBCONF 40 ' 50 ' USE THE FILE DECL.BAS PROVIDED BY NATIONAL INSTRUMENTS TO INITIALIZE THE GPIB DRIV-...
Page 103 520 CALL IBWRT(SR430%, WRT$) ' SEND 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...
Page 104: Test And Calibration
TRIGGER input of the window on the power entry module. Verify that the SR430. The trigger rate should be variable up to 2 line cord is plugged all the way into the power en- kHz. Set the Trigger Level and Slope to trigger on try module and that the power button on the front the generator output.
Page 105: Counting Problems
If all signals check out and problems still exist, contact the factory for more information. COUNTING PROBLEMS There are several reasons why the SR430 may not seem to be counting correctly. 1)Bad triggering. The trigger input may not be dis-...
Page 106: Calibration
Test and Calibration CALIBRATION WARNING Most of the calibration parameters are determined The calibration procedure requires adjusting the by a computer aided calibration procedure after instrument with power applied and so there is a burn-in at the factory. These calibration parame- risk of personal injury or death by electric shock.
Page 107 Test and Calibration...
Page 108: Using Photomultiplier Tubes
A good, wide bandwidth pre- a potential of 100 to 400 Vdc. Secondary electrons amplifier (such as the SR430) will have about 1.5 are ejected when the electron strikes the first dy- nV per root Hertz, or about 25 µV rms over its 250 node, and these electrons are accelerated toward MHz bandwidth.
Page 109: Pmt Base Design
Using Photomultiplier Tubes PMT's which are specifically designed for photon ber of ejected electrons) gives rise to a large varia- counting will specify their noise in terms of the rate tions in the pulse height of the detected signal. of output pulses whose amplitudes exceed some Since statistical fluctuations in pulse height are fraction of a pulse from a single photon.
Page 110: Snubbing
Using Photomultiplier Tubes with Zener Diodes. As long as there is some re- frequency ringing of the anode output signal. This verse current through a Zener, the voltage across can cause multiple counts for a single photon. The the diodes is nearly constant. This will prevent the problem is significantly reduced by using small re- voltage on these stages from dropping as the out- sistors between the dynodes and the bypass ca-...
Page 111: Cathode Shielding
Using Photomultiplier Tubes flections from the input to the preamplifier. PMT PULSE A good starting point for a snubber network is a 10 WITHOUT inch piece of RG174/U coax cable with a small 50 2 ns SNUBBER Ohm pot connected to the end so that the termi- nating impedance may be adjusted from 0 to 50 Ohms.
Page 112: Gain Requirement
PMT's. The PMT should be operated at (or a bit above) the recommended The SR430 can detect pulses as low as 2 mV. To maximum high voltage. Provide enough illumina- allow for some adjustment of the discriminator...
Page 113 Using Photomultiplier Tubes...
Page 114: Typical Experiment
694.3 NM BANDPASS INTERFERENCE FILTER Av=5 RUBY TO SR430 DISK R928 PMT 50Ω SNUBBER 10" RG174 GREEN 1/4 SR440 20Ω...
Page 115: Instrument Configuration
Hz will not generate rate errors. 100 records will take 2.5 sec to complete. DATA ACQUISITION After the SR430 Levels and Mode menus have been setup, data acquisition may begin. Pressing the [START] key starts the first record. Data accu- mulates on the screen until all 100 records have been acquired.
Page 116: Circuit Boards
CPU Board ECL Logic Board CAUTION CIRCUIT BOARDS The SR430 has five main printed circuit boards. Always disconnect the power cord and The five boards shown above contain all of the ac- wait at least two minutes before open- tive circuitry of the unit. A sixth, front panel circuit board (not shown), only has keypad contacts print- ing the unit.
Page 117: Video Driver And Crt
Circuit Description U403 and U404 are also 32kbyte static RAMs. VIDEO DRIVER AND CRT They are mapped at 40000H to 4FFFFH (64k) and are used as the display data memory. Up to 16k data points may be stored in this memory. Data Potentially lethal voltages are present stored in this memory may be graphed on the in this circuit.
Page 118: Spin Knob
Circuit Description latched into U804 and U809 which are parallel to Only keyboards which operate in the PC or 8088 serial converters. The video data is then shifted mode will function with this interface. out at 13.5 MHz and synchronized by U806B. U803C blanks the video data except during active display times.
Page 119: Power Supply Board
Circuit Description set all of the output voltages. This provides very POWER SUPPLY BOARD accurate power supply outputs. The power switch simply switches the power to U9. When U9 is off, CAUTION: Dangerous voltages are present the reference voltage is removed and the regula- on this circuit board whenever the instru- tors drop to zero volts.
Page 120: Ecl Logic Board
Circuit Description vides the oscillator output by 64 to provide a 3.125 ECL LOGIC BOARD MHz signal to the phase comparator U304. A 25 MHz crystal oscillator, divided by 8 in U306, is the The ECL Logic Board contains the discriminator, reference signal for U304.
Page 121: Pulse Sorter
Circuit Description There are 2 count channels, even and odd. While U703A is also clocked by the 200 MHz clock. one counter is counting, the other is storing data When its output and the output of U702B are dif- and resetting. The complete cycle time is 40 ns of ferent, then a pulse has been detected and the counting and 40 ns of resetting and storing.
Page 122: Control Signals
Circuit Description shift register which stores the state of each 5 ns TTL LOGIC BOARD sample, either a one or a zero. The TTL Logic board contains the data acquisition U703B divides the 200 MHz clock by 2. The 100 memory and bin counters as well as the accumula- MHz and -100 MHz outputs clock 2 8-bit shift reg- tion circuitry.
Page 123: Accumulator
Circuit Description the DONE signal becomes active. DONE inter- rupts the processor to rearm the trigger to acquire U1017 and U1018 are 32kbyte copy buffers which the next record. interface to the processor. While data is accumu- lating, U1017 and U1018 can copy an image of the accumulation buffer.
Page 124: Digital To Analog Converter
Circuit Description U1302-U1306 are the output ports. The processor writes to these ports 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.
Page 125 Circuit Description...
Page 126: Parts Lists
Part List SR430 COMPONENT PARTS LIST CONTROL BOARD REF. SRS part VALUE DESCRIPTION BT701 6-00001-612 BR-2/3A 2PIN PC Battery C 101 5-00177-501 Capacitor, Ceramic Disc, 50V, 10%, SL C 102 5-00215-501 Capacitor, Ceramic Disc, 50V, 10%, SL C 103 5-00028-507...
Page 127 Part List C 1016 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1017 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1018 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1019 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 1020 5-00225-548 .1U AXIAL...
Page 128 Part List JP901 1-00209-133 34 PIN DRA Connector, Male, Right Angle JP902 1-00238-161 GPIB SHIELDED Connector, IEEE488, Reverse, R/A, Female JP903 1-00016-160 RS232 25 PIN D Connector, D-Sub, Right Angle PC, Female JP1000 1-00088-130 40 PIN DI Connector, Male JP1001 1-00088-130 40 PIN DI Connector, Male...
Page 129 Part List U 101 3-00354-340 80C186-12 Integrated Circuit (Thru-hole Pkg) U 201 3-00340-340 74ALS373 Integrated Circuit (Thru-hole Pkg) U 202 3-00340-340 74ALS373 Integrated Circuit (Thru-hole Pkg) U 203 3-00340-340 74ALS373 Integrated Circuit (Thru-hole Pkg) U 204 3-00341-340 74ALS245 Integrated Circuit (Thru-hole Pkg) U 205 3-00341-340 74ALS245...
Page 130: Power Supply Board
Part List U 906 3-00109-340 MC1488 Integrated Circuit (Thru-hole Pkg) U 907 3-00353-340 DP8473N Integrated Circuit (Thru-hole Pkg) U 908 3-00040-340 74HC157 Integrated Circuit (Thru-hole Pkg) X 101 6-00068-620 24.000 MHZ Crystal X 701 6-00015-620 32.768 KHZ Crystal X 801 6-00069-620 13.5168 MHZ Crystal...
Page 131 Part List C 36 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad C 37 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad C 38 5-00098-517 Capacitor, Tantalum, 35V, 20%, Rad C 39 5-00098-517 Capacitor, Tantalum, 35V, 20%, Rad C 40 5-00098-517 Capacitor, Tantalum, 35V, 20%, Rad C 41 5-00098-517 Capacitor, Tantalum, 35V, 20%, Rad...
Page 132 Part List 4-00034-401 Resistor, Carbon Film, 1/4W, 5% 4-00305-401 4.3K Resistor, Carbon Film, 1/4W, 5% 4-00046-401 2.0M Resistor, Carbon Film, 1/4W, 5% R 10 4-00065-401 3.3K Resistor, Carbon Film, 1/4W, 5% R 11 4-00185-407 4.02K Resistor, Metal Film, 1/8W, 1%, 50PPM R 12 4-00470-407 10.5K...
Page 133: Ecl Logic Board
Part List R 64 4-00051-401 2.7K Resistor, Carbon Film, 1/4W, 5% R 65 4-00027-401 1.5K Resistor, Carbon Film, 1/4W, 5% R 66 4-00076-401 Resistor, Carbon Film, 1/4W, 5% R 67 4-00051-401 2.7K Resistor, Carbon Film, 1/4W, 5% R 68 4-00027-401 1.5K Resistor, Carbon Film, 1/4W, 5% 3-00143-340...
Page 134 Part List C 19 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 20 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 21 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad C 22 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 23 5-00225-548 .1U AXIAL...
Page 135 Part List C 221 5-00012-501 330P Capacitor, Ceramic Disc, 50V, 10%, SL C 301 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 302 5-00237-523 Capacitor, Silver Mica, Miniature C 303 5-00238-523 Capacitor, Silver Mica, Miniature C 304 5-00151-501 680P Capacitor, Ceramic Disc, 50V, 10%, SL C 305 5-00151-501...
Page 136 Resistor Network SIP 1/4W 2% (Common) N 1501 4-00247-425 100X9 Resistor Network SIP 1/4W 2% (Common) P 101 4-00326-441 Pot, Multi-Turn Trim, 3/8" Square 7-00267-701 SR430-ECL Printed Circuit Board Q 101 3-00018-324 MRF904 Transistor, TO-72 Package Q 102 3-00178-327 MRF965...
Page 137 Part List R 213 4-00031-401 Resistor, Carbon Film, 1/4W, 5% R 214 4-00034-401 Resistor, Carbon Film, 1/4W, 5% R 215 4-00034-401 Resistor, Carbon Film, 1/4W, 5% R 216 4-00063-401 3.0K Resistor, Carbon Film, 1/4W, 5% R 217 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5% R 218 4-00080-401 Resistor, Carbon Film, 1/4W, 5%...
Page 138 Part List R 405 4-00027-401 1.5K Resistor, Carbon Film, 1/4W, 5% R 406 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5% R 407 4-00103-401 Resistor, Carbon Film, 1/4W, 5% R 408 4-00031-401 Resistor, Carbon Film, 1/4W, 5% R 409 4-00086-401 Resistor, Carbon Film, 1/4W, 5% R 501 4-00471-401 Resistor, Carbon Film, 1/4W, 5%...
Page 139: Ttl Logic Board
Capacitor, Ceramic Disc, 50V, 20%, Z5U 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad 6-00212-630 1"X.25"CYL Ferrite Beads 6-00213-630 2-HOLE Ferrite Beads 7-00282-720 SR430-22 Fabricated Part TTL LOGIC BOARD REF. SRS part VALUE DESCRIPTION 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad 5-00225-548 .1U AXIAL...
Page 140 Part List C 10 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 11 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 12 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 13 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 14 5-00225-548 .1U AXIAL...
Page 141 Resistor Network SIP 1/4W 2% (Common) N 1004 4-00592-425 4.7KX9 Resistor Network SIP 1/4W 2% (Common) P 1601 4-00008-440 Trim Pot, Single Turn, In-Line Leads 7-00241-701 SR430-TTL Printed Circuit Board Q 1001 3-00026-325 2N5210 Transistor, TO-92 Package Q 1002 3-00026-325 2N5210...
Page 142 Part List U 801 3-00367-341 8KX8-45 STATIC RAM, I.C. U 802 3-00367-341 8KX8-45 STATIC RAM, I.C. U 803 3-00367-341 8KX8-45 STATIC RAM, I.C. U 804 3-00367-341 8KX8-45 STATIC RAM, I.C. U 805 3-00299-341 32KX8-100L STATIC RAM, I.C. U 806 3-00365-340 74F157 Integrated Circuit (Thru-hole Pkg) U 901...
Page 143: Hardware
0-00287-053 8.5 #24 GRN Wire #24 UL1007 Strip 1/4x1/4 Tin 0-00310-010 HEX 3/8-32 Nut, Hex 0-00318-004 SR430 Knobs 0-00320-004 SR430 CAP Knobs 0-00330-050 5-1/2" #18 Wire #18 UL1007 Stripped 3/8x3/8 No Tin 0-00331-031 4-40X5/8 F/F Standoff 0-00335-000 FAN GUARD 2 Hardware, Misc.
Page 144 7-00284-720 PLTFM-20 Fabricated Part 7-00286-720 7" CRT SCREEN Fabricated Part 7-00287-721 PLTFM-23 Machined Part 7-00289-720 PLTFM-26 Fabricated Part 7-00291-709 SR430-23 TO 25 Lexan Overlay 7-00292-720 PLTFM-27 Fabricated Part 7-00350-720 PLTFM-29 Fabricated Part 7-00396-701 PLTFM FP Printed Circuit Board 7-00414-720 SR770-17...
Page 145: Miscellaneous
Part List 7-00473-720 SR770-27/28/29 Fabricated Part 8-00034-850 FLOPPY Disk Drive 8-00040-840 7" Z-AXIS CRT Display 9-00267-917 GENERIC Product Labels MISCELLANEOUS REF. SRS part VALUE DESCRIPTION U 301 3-00345-342 64KX8-120 EPROM/PROM, I.C. U 302 3-00345-342 64KX8-120 EPROM/PROM, I.C. U 303 3-00345-342 64KX8-120 EPROM/PROM, I.C.
Page 146: Addendum
RE: Disk Utilities of the SR430 Date: Sept. 10, 2002 Some of the SRS instruments have build-in floppy disk drives. The SR430 only works properly with low-density disks (DS/DD). Recently, it has become increasing difficult to 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.

SRS Labs SR430 Manual

Condensed Information

Instrument Overview

Operation

Front Panel Overview

Screen Display

Keypad

Rear Panel

Menus

Instrument Setups

Remote Programming

Detailed Command List

Status Byte Definitions

File Formats

Program Examples

Test and Calibration

Calibration

Using Photomultiplier Tubes

Typical Experiment

Circuit Description

Circuit Boards

Video Driver and CRT

CPU Board

Power Supply Board

ECL Logic Board

TTL Logic Board

Parts Lists

Addendum

Quick Links

Need help?

Questions and answers

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Summary of Contents for SRS Labs SR430

Table of Contents