TRIUMF: Canada's national laboratory for particle and nuclear physics

Magnetic field mapping system : an operation and service manual Cobb, Roland W. Feb 28, 1969

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MAGNETIC FIELD MAPPING SYSTEM  AN OPERATION AND SERVICE MANUALRoland W. C obb  University of VictoriaMESON F A C IL IT Y  OF:UNIVERSITY OF ALBERTA SIMON FRASER UNIVERSITY UNIVERSITY OF VICTORIA UNIVERSITY OF BRITISH COLUMBIA T R I - 6 9 - 3T R I U M FMAGNETIC FIELD MAPPING SYSTEMAn Operation and Service ManualRoland W. CobbTRI-69-3Physics Department University of Victoria February 1969TABLE OF CONTENTS1. INTRODUCTION ..................................  12. COORDINATE TABLE ..............................  33. READOUT SYSTEM3.1 Data a c q u i s i t i o n .......................... 43.2 Readout routine . . . . . . . .  53.3 Readout format ...........................  64. OPERATING INSTRUCTIONS4.1 Manual control of the saddle . . . .  74.2 The limit switches.......................... 84.3 Z-direction speed .......................  84.4 X- and Y-position . . . . . . .  94.5 Grid s i z e ................................. 104.6 Teletype . . . . . . . . .  104.7 Digital voltmeter . . . . . . .  114.8 Control electronics OFF and ON switch . . 1 14.9 Control panela. EMERGENCY O F F .......................... 11b. Mode S w i t c h ............................. 11c. OVERRIDE.................................13d. R E S E T ................................. 13e. Manual mode buttons and switchi) MOTOR ON - O F F ...................... 13ii) DIRECTION LEFT - RIGHT . . . . 1 4iii) R E C O R D ..............................14iv) PAUSE (manual) . . . . . . 1 4v) END R E C O R D ..........................14f. Automatic mode buttonsi) START R U N .......................... 14ii) PAUSE (automatic) ................ 154.10 Suggested Operating Procedures . . . .  15/TABLE OF CONTENTS(continued)5. THEORY OF OPERATION5.1 Control U n i t ............................. 175.2 Read Pulse . . . . . . . . .  195.3 Rotation Counter Coder ...................  195.4 Code Converter............................. 205.5 Teletype Control and Date Transfer Unit . 206. CIRCUIT DETAILS..................................22-  1 -1. INTRODUCTIONThe purpose of this report is to provide an operating and service manual for the magnetic field measuring system developed at UVic to study TRIUMF beam line magnets. The system is described as it existed in January, 1969.The field measuring system consists of a three-dimensional coordinate table, a digital voltmeter (DVM), control and readout elec­tronics, and a Teletype equipped with a paper tape punch. This system provides a method of transporting a field-sensitive device throughout the volume of a magnetic field while obtaining a punched and typed record of positions and field readings. The field measuring devices are not described here.The volume capable of being mapped is 54 inches by 8.8 inches by 8 inches high, which is ideal for quadrupoles and quadrupole combinations. The width can be easily extended by a simple bracket from 8.8 inches to 24 inches, which is suitable for bending magnets. Positional accuracy approaches ±0.002 inches per foot and position measurements are read to 0.001 inch.The system is partially automated, the extent of automation being based on an estimate of the amount of use. Only the longitudinal 54 inch motion is motor-controlled. Position and DVM readings are automatically read and recorded on the Teletype during motion in this direction.- 2 -The digital voltmeter used is a Hewlett Packard Model 3440A (a meter on hand but perhaps not the best choice). This DVM will prove inadequate if voltages of 10 microvolts must be accurately measured or if sampling times less that 60 msec are necessary. Since the field readings are made while the field sensitive device is in motion, a long sampling time may greatly lengthen field mapping times. The meter had 1-2-2-4 BCD output; a code converter, to 1-2-4-8 BCD, was therefore required. The code converter is described in a separate report.Although Digital Equipment Corporation R series "Flip Chip" modules were used in much of the electronics, a large amount of the electronics was designed and built here. The "home built" electronics will be described in some detail since future modifications to the operation of the system may be desired.The system was put together with the help of Jack Nelson, who built most of the electronics. The lathe modifications were made by W. Thomson.- 3 -2. COORDINATE TABLE1The coordinate table consists of a lathe - "Versa-Mil" combination.2The lathe is a Standard-Modern Series 3000 which provides 54 inches travel of the saddle along the bed of the lathe (subsequently to be referred to as the Z-direction) and 8.8 inches travel of the cross slide across the bed (subsequently to be referred to as the X-direction). The Z-direction motion is controlled by the lead screw which is driven by a motor through a quick change feed box. The feed box allows Z-direction speeds of from 0.03 inches/ sec to 0.205 inches/sec. The lead screw is also used to measure distance in the Z-direction (accurate to ±0.0015 inches per foot). Likewise the X-directional motion is controlled and measured by the cross feed screw; however, this screw is not motor driven.Motion in the vertical direction (to be referred to as the Y-direction) is obtained with the use of a "Versa-Mil". This machine has four vertical posts. A gear box can be moved up and down on these posts over a distance of eight inches. The position of the box is controlled and measured by a vertical lead screw. The gear box provides the supporting base for a field sensitive device.When the "Versa-Mil" is mounted on the lathe cross slide, a three-dimensional coordinate table results. The heavy construction of both the lathe and the "Versa-Mil" produces a very rigid coordinate table.The position in all three dimensions can be read to 0.001 inches. With care in leveling the lathe and "Versa-Mil", positional accuracies approaching 0.002 inches should be obtainable.1The Dumore Co., Racine, Wisconsin, U.S.A.2Standard-Modern Tool Co. Ltd., Toronto, Ontario- 4 -3. READOUT SYSTEM3.1 Data acquisitionThe recording of position and voltage readings, or readout, is accomplished by the readout system. Readout occurs during motor controlled motion in the Z-direction. Each readout event is initiated in sequence by a read signal produced by a microswitch working off a cam wheel on the Z-direction lead screw. The sequence of readout events occurring during a Z-direction traverse is automated but the X- and Y-positions must be set by hand between every traverse.Rotation counters with visual and electrical readouts are attached to all three lead screws. These counters only count the number of complete revolutions (or half revolutions, depending on gearing); therefore, accurate positions cannot be read from them. However, if the counters are read only at a well known angle of lead screw rotation, accurate positions can be inferred. This principle must be observed when setting the X- and Y-positions if counter readout is used and also if a regular grid of field readings is wanted.The Z-direction counter is read only when a read signal is received from the readout microswitch. The point at which this micro­switch is switched accurately defines a rotation angle of the cam wheel and therefore a precise measurement of the Z-position is obtained.Since the microswitch read signal also initiates DVM readings, we also can infer the precise locations at which DVM voltage samplings begin.- 5 -It should be noted that runs can be made in two directions. Due to backlash, the Z-positions, as defined by the microswitch, will depend on the direction of motion. Since backlash can change during the life of the lathe, it must be measured from time to time.3.2 Readout routineThe readout routine programmed into the control electronics in the present system results in the following readout sequence called a "run".Microswitch read _ ..signal numbers1 (start) Rotation counters recorded2 Nothing3 DVM reading recorded4 DVM reading recordedetc Etc.• • •  •  • •n-3 DVM reading recordedn-2 DVM reading recordedn-1 Nothingn (end) Rotation counters recordedThe second and n-l1"^  microswitch read signals have no effect. This is necessary if no error is to result during change from rotation counter to DVM readout for the fastest lead screw speeds. It is assumed that, previous to each readout sequence or run, a manual setting of the X- and Y-positions has been made. The positions of the first and last read signals are set by limit switches on the lathe.- 6 -3.3 Readout formatReadout of a rotation counter involves the typing and punching of seven digits and two carriage control commands. The first three digits are read from the Z-direction rotation counter, the next two from the X-direction counter, and the last two from the Y-direction counter. The carriage control commands normally are two spaces but at the end of a typing line these are replaced by a carriage return and line feed.As for the rotation counter reading, a DVM readout involves nine characters. In this case, however, the first character is a plus or minus sign indicating the polarity of the voltage read. This is followed by four digits, an asterisk, and another digit, i.e. ±nnnn*m.The last two characters are carriage control commands identical to that for the rotation counter readout. To obtain the measured voltage in millivolts, place a decimal in front of the four digits and multiply the four digits by 10 to the power m, where m is the digit in the seventh place. That is, if the readout is ±nnnn*m, the voltage is iO.nnnn x 10m millivolts.From the readout routine described before, it can be seen that the readout from a run will consist of a rotation counter reading followed by an arbitrary number of DVM readings followed by another rotation counter reading. Fig. 1 shows the typed readout for several runs.0604231 +0005*3 +0005*3 +0006*3 +0006*3 +0008*3 +0009*3 +0013*3+0014*3 +0014*3 +0010*3 +0008*3 +0006*3 +0005*3 +0005*3 04342310434231 +0005*3 +0005*3 +0006*3 +0007*3 +0011*3 +0015*3 +0015*3+0014*3 +0012*3 +0009*3 +0007*3 +0006*3 +0005*3 +0005*3 06042310604231 +0005*3 +0004*3 +0005*3 +0008*3 +0010*3 +0011*3 +0014*3+0015*3 +0014*3 +0011*3 +0009*3 +0006*3 +0004*3 +0005*3 0434231Fig. 1. A Sample of Typed Readout- 7 -4. OPERATING INSTRUCTIONS4.1 Manual control of the saddleThe saddle can be moved along the bed of the lathe manually using the apron hand wheel located to the left on the apron. To do this, the saddle must be freed from the lead screw by turning the half nut lever so it points up. The half nut lever is located to the right on the apron just below the X-direction rotation counter. (See lathe instruction manual.)When moving the saddle, great care must be exercised to ensure that the limit switches on the back of the lathe are not damaged. These switches are attached at the back of the bed and are actuated when the back of the saddle strikes them. However, they are designed to be struck from one direction only. Under manual control, it is possible to move the saddle one way so far that on return it destructively strikes the limit switches from the wrong direction.Lead screw control of the carriage is regained by turning the half nut lever to the right using care that it engages the lead screw freely. Accuracy can be destroyed by forcing this lever. Once field mapping has begun, the lead screw must remain engaged until the entire field is plotted.- 8 -4.2 The limit switchesThe limit switches slide along a T slot on the back of the lathe bed. Each limit switch can be locked in position by two levers.It will be noticed that each limit switch consists actually of two microswitches. The inner microswitch (the microswitch first to be struck by the saddle) initiates an "end run" routine when the readout is in automatic mode. The outer microswitch is a safety switch which turns off the motor if ever it is struck. It is not expected that the outer switches will normally be used except in error.The limit switches are used to define the length of a run inthe automatic readout mode. In the manual mode, the inner switches haveno effect. In both modes, the outer switches operate.4.3 Z-direction speedThe Z-direction speed of the saddle is determined by the gear setting in the feed box located at the left end of the lead screw beneath the headstock. The various settings are listed on a plate on front ofthe feed box. The fine and coarse option is not available.The Z-direction saddle speed v can be obtained by using the following expression:0.41 v = — -—- 9 -The value of t is the listed number of threads per inch for the gear setting used. This list is found on the feed box plate. Use only the coarse thread section, i.e. a number between 2 and 14. The speed v is in inches per second. The speed should be chosen so that there is at least one second between microswitch read signals.4.4 X- and Y-positionThe X- and Y-lead screws are controlled by large hand wheels. For each screw there is a dial marked in thousandths of an inch. One complete revolution of the vertical Y-lead screw moves the Versa-Mil gear box 0.1 inches while one revolution of the X-cross feed lead screw moves the cross slide 0.2 inches.For rotation counter readout, the Y-lead screw must be rotated until the zero mark on the lead screw dial is lined up with the index mark. In the case of the X-lead screw, either the zero mark or the 100 mark on the X-lead screw dial may be lined up with the index mark. Due to backlash it is essential that the same direction of hand wheel rotation be always used for alignment. The aligning should always involve a final 1/8 revolution of the hand wheel in the fixed selected direction to yield the aligned setting.- 10 -4.5 Grid sizeWhen mapping a volume, the smallest grid size in the X- and Y-direction is 0.1 inches. Any multiple of 0.1 inches can be used.The pitch of the Z-direction lead screw is 0.25 inches and with the present lead screw cam wheel, the Z-direction grid spacing is0.25 inches.To make finer grids than now available, the gearing between the lead screws and the rotation counters must be changed so that the rotation counter can distinguish between two adjacent grid points.A cam wheel to allow Z-direction grid spacings of 0.125 inches has been made and new gearing for this wheel is planned.4.6 TeletypeThe teletype is turned on by switching the control knob on front from OFF to LOCAL.There are four push buttons on top of the tape punch at the left of the teletype. The ON and OFF buttons turn the punch on and off. The button marked REL releases the tape feed mechanism so that tape can be easily removed from the tape punch. The button marked B.SP. backspaces the tape one combination of code holes.- 11 -4. 7 Digital voltmeterFor field mapping purposes, the sampling rate knob on the front of the DVM should be turned to HOLD.The range selection knob on the DVM plug-in unit may be setat the 100 mv, 1000 mv, 10 v, 100 v, or 1000 v range. The remote settingis never used. The automatic setting can be used but timing allowancesmust be made. With this setting, the sampling time may increase toseveral times 60 msec. The maximum rate is correspondingly lowered.4.8 Control electronics OFF and ON switchThe CONTROL switch which turns the control electronics on and off is located on the side of a box that is attached to the back of theIlathe headstock at the left end of the lathe. Before using, see the section "Suggested operating procedures" on pages 15 and 16.4.9 Control panela. EMERGENCY OFFThe control panel is shown in Fig. 2. At the top of the panel there is a button encircled in red paint marked EMERGENCY OFF. This will always turn off the motor directly if any destructive error is being made.b. Mode SwitchIt will be noticed that two groups of control buttons are defined by red lines. The two groups are separated by the mode switch, whose positions are marked MANUAL and AUTOMATIC. When the mode switch is set to MANUAL, the top group of buttons become effective and the bottom group ineffective. The opposite is true when the mode switch is set at AUTOMATIC.- 12 -F I G U R E  2  C O N T R O L  P A N E L- 13 -The top group or manual group of buttons includes: the MOTOR ON - OFF switch, the DIRECTION LEFT button, the DIRECTION RIGHT button, the RECORD button, the PAUSE button, and the END RECORD button. In the bottom or automatic group are the START RUN and PAUSE buttons.c. OVERRIDEThe button marked OVERRIDE is unaffected by the mode switch.The OVERRIDE switch overrides the effect of the outer limit switches on the lathe. The outer limit switches cause the motor to stop when by error they are struck. If they are struck, the motor can be restarted with the OVERRIDE button. Supposedly the OVERRIDE button would be used after first changing the motor direction as can be done in the manual mode.d. RESETThis is another button not affected by the mode switch. During readout, a routine is established in the control electronics. The RESET button resets the routine; that is, it clears the electronics so that it is in a state which permits a new readout routine to begin. Note that the RESET button also resets the readout format. Therefore, the carriage return key on the teletype should always be used when the electronics is reset.e. Manual mode buttons and switchi) MOTOR ON - OFFThe MOTOR switch turns the motor off and on only when the mode switch is at manual. If the electronics has been reset, readout is not initiated by this switch.- 14 -ii) DIRECTION LEFT - RIGHTThe two DIRECTION buttons can be used to select the direction of lathe saddle motion. They only work with the mode switch at MANUAL and the MOTOR switch OFF.iii) RECORDIf the electronics is in the reset state and the mode switch is at MANUAL, the RECORD button will initiate the readout routine. The readout routine can be initiated before or after the MOTOR switch is turned on but the routine will not proceed until the MOTOR switch is on.iv) PAUSE (manual)In the manual mode, depressing the PAUSE button will temporarily stop the motor. If the readout routine is in progress when the button is used, both the motor and the routine will temporarily halt. When the button is again depressed, the motor will start and the routine willresume from the point at which it was when temporarily halted.v) END RECORDWhen the readout routine is proceeding in the manual mode, the conclusion of the routine can be initiated with the END RECORD button. The button should not be used until at least one DVM reading has been recorded.f. Automatic mode buttonsi) START RUNThe START RUN button is used to initiate a run in the automaticmode. It is assumed that the electronics is in a reset state when thebutton is used.- 15 -When a run is initiated, the motor starts and the readout routine begins. No control over the direction of the saddle motion exists. The run will proceed until an inner limit switch is struck, at which time the run is concluded. The conclusion of a run involves two DVM readings, one rotation counter reading, the turning off of the motor, the automatic resetting of the routine, and changing of motor direction in preparation for a subsequent run in the opposite direction.If the START RUN button is depressed while an inner limit switch is switched, that inner limit switch has no effect.ii) PAUSE (automatic)/The automatic PAUSE button in the automatic mode has the same effect as the manual PAUSE button in the manual mode.4.10 Suggested Operating ProceduresBefore turning on the control electronics ON - OFF switch, it is advisable to set the mode switch to MANUAL and set the MOTOR ON - OFF switch to OFF. It is also better if the teletype control knob is off.After the control electronics ON - OFF switch is turned on, the RESET button should be used to clear the electronics. The teletype carriage should be returned at this time. The system is now ready for use.- 16 -Under certain circumstances, the mode switch can be usefullyswitched while the motor is running or during readout. If the MOTORswitch is turned on, the mode switch may be turned from AUTOMATIC to MANUAL during the progress of an automatic run. This feature can be used when it is desired to initiate the ending of a run routine before an inner limit switch is struck. When under manual control in which readout is in progress, the mode switch can be switched to AUTOMATIC if it is desired that the readout should proceed in automatic mode.If the motor will not turn on, check the EMERGENCY OFF button or the two PAUSE buttons. Also check the outer limit switches.If readout cannot be made to proceed, check to see if thelathe lead screw is turning. No readout or unwanted readout may result if the DVM sampling rate knob is not at hold.- 17 -5. THEORY OF OPERATION5.1 Control UnitThe operation of the system is controlled by the "control unit". The function of the unit is to turn the motor on and off, control motor rotation direction, select rotation counter or DVM data for recording, and transmit read data pulses.To usefully record data, the functions of the control unit must be undertaken in a suitable order. There are two sequences in which the functions are undertaken, the "begin sequence" and the "end sequence". When it is desired to begin the recording of data, the begin sequence is selected with the result that a rotation counter reading is made, followed by an arbitrary number of DVM readings. On switching to the end sequence, two more DVM readings are made, followed by one rotation counter reading.The operation of the control unit depends on six basic flip-flops and to understand the operation of the unit, it is necessary to know the purpose of these flip-flops. The flip-flops and their purposes are as listed:Flip-flop number Function Result when cleared1 rotation - DVM selection rotation counters selected2 read transmission read pulse transmitted3 motor direction4enables begin or end no sequence of functionssequence to proceed can occurr begin or end sequence , . . ,5 r begin sequence selectedselection, set for begin to end ,6 ? no change setsequence changeNote: In the automatic mode, flip-flop 4 also controls whether the motor is on or off (off when cleared).- 18 -If data is to be recorded, the begin run sequence is initiated. This is accomplished in the automatic mode by depressing the START RUN button and in the manual mode by depressing the RECORD button after first turning the motor switch on. The begin run sequence proceeds when microswitch read pulses are received. The begin sequence is as follows:Sequence of events 1Flip-flops 2 4 5 6 Operation Undertakeninitial state c c c c cstart pulse(from control panel) c c c->s c cenables control to receive microswitch read pulses and therefore to start the begin sequence1 st microswitch pulse c c->-s s c c rotation counters read2nd microswitch pulse c->-s s-^-c s c c nothing read, selection relays changed3rd microswitch pulse s c s c c DVM read4th, 5th, etc. s c s c c DVM readc = clear s = setTo end the data recording, it is necessary to change to the end sequence. This change is effected in the manual mode by depressing the END RECORD button and in the automatic mode by the tripping of inner limit switches on the lathe. The end sequence proceeds as follows:- 19 -Sequence of eventsFlip-flops 1 2 4 5 6 Operation Undertakenbegin sequence statechange to end sequence signals c s c cs c s c c->-snext microswitch pulse s c s c->-s s DVM readnext microswitch pulse s c-*-s s s s DVM readnext microswitch pulse s->c s>c s s snothing read, selection relays changedrotation counters read,next microswitch pulse c c s-*c s-*c s->-c no more microswitch readIt should be noted that the end sequence leaves the control unit cleared. Also, in the automatic mode, the last step of the end sequence complements the third flip-flop.5.2 Read PulseThe read pulse originates at the microswitch operating off the lead screw cam. Such a pulse only occurs when the fourth flip-flop is set. The pulse is sent to the control unit and will be retransmitted from the control unit if the second flip-flop is cleared.The transmitted read pulse is sent to both the rotation counter coder and the DVM. The pulse is used to produce a read and hold in both the coder and DVM.When the DVM receives the read pulse, the voltage is measured and digitized. After some delay for this process (60 msec in the HP 3440A voltmeter) a further read pulse or print command is sent from thepulses can occur- 20 -DVM to the teletype control unit. It should be noted that the teletype control unit receives the print command from the DVM even though rotation counter data are to be printed.5.3 Rotation Counter CoderThe count from the rotation counters is in decimal form. The coder transforms this into binary coded decimal for transmission to the teletype control unit. Since the Z-direction counter is continually rotating, the Z-direction count is read and stored in the coder upon receipt of a read pulse from the control unit.5.4 Code ConverterThe DVM output is in 1-2-2-4 BCD code and therefore unsuitable. The code converter converts the output to 1-2-4-8 BCD code.5.5 Teletype Control and Data Transfer UnitThe data from the rotation counters and the DVM are in the form of seven BCD numbers in parallel. The numbers must be transmitted to the teletype in serial form using 8 level ASCII code. The teletype control unit is used to accomplish this and to control the format of the printed numbers.A read or print command received by the teletype control unit starts a clock. The pulses from the clock are counted by an up counter consisting of four flip-flops. The count existing in this up counter determines which of the seven input data lines is connected to the output drivers.- 21 -The data line selection counter counts to nine before being cleared. During the eighth and ninth count, no input data line is connected to the output drivers. Instead, the code for two spaces or a carriage return and line feed are switched to the output.The tenth clock pulse is used to clear the data line selection counter and to turn the clock off. While the clock is on, the tape reader feed magnet is disconnected and an eighth level contact is made in the teletype.For each of the first nine clock pulses, a punch pulse is sent to the teletype distributor clutch coil after a suitable small delay.The output format is controlled by a second four flip-flop up counter. The format counter counts each time an eight count occurs in the data line selection counter. Normally, two spaces are switched to the output drivers during the eighth and ninth count in the data line selection counter. However, when eight is set in the format counter, a carriage return and line feed replace the two spaces. When eight appears in the format counter, the format counter is cleared on the tenth clock pulse.- 22 -6. CIRCUIT DETAILSThe circuit modules in the control unit and memory of the rotation coder were designed and built here. In order that these modules may be reused and added to, they will be described in some detail.The module circuits, such as flip-flops, inverters, etc.,, are mounted on cards which plug into connectors. To ensure that the circuits are useful for general applications and to ensure modifications to the logic are easily made, all interconnections between circuits were made externally between plug-in connectors and not internally between the module circuits on the same card.Logic levelsThe logic levels used are 0 volts for upper level and -10 vto -15 v for the lower level. Level changes occur in less than 1 ysec.Standard pulseThe standard pulse used is a positive pulse of 6 volts. Ithas a rise time of less than 1 ysec and a length of 50 ysec.- 23 -Diode gatePulse inputs to flip-flops and pulse amplifiers are through standard diode gates which will be given the symbol:Fig. 4. Symbol for standard diode gateA standard pulse, received at the input, will result in an output signal if the gate is at zero volts. However, -10 v to -15 v on the gate will prevent any output. The effect of a change in gate level is delayed at least 100 psec.Standard flip-flopThe symbol for a standard flip-flop is shown below:Fig. 5. Symbol for standard flip-flop- 24 -F I G U R E  6  S T A N D A R D  F L I P  -  F L O PT R A N S I S T O R S ;  2 N I 3 0 5  D I O D E S ;  I N 4 7 8- 25 -Fig. 6 shows the circuit corresponding to this symbol.Standard logic levels are produced at the "0" and "1" outputs if no more than -5 ma are drawn from these outputs. The outputs for the clear and set states are:IfQlf ll^llset 0 v -15 vclear -15 v 0 vThe dc clear or set inputs are activated by a negative voltage between -10 v and -15 v. A zero volt level will have no effect on the flip-flop.The pulse clear and set inputs are through standard diode gates. It will be necessary to have two diode gates to set one flip- flop. When there are two diode gates which are connected to the base of one transistor, the symbol shown in Fig. 7 will be used.Fig. 7The corresponding circuit is shown in Fig. 8.- 26 -iiiiFig. 8Pulse AmplifiersThere are three types of pulse amplifiers used:1. The first pulse amplifier is given the symbol shown in Fig. 9.output o- P A 1 -o inputFig. 9This amplifier is designed to produce a standard pulse when the input is switched from open circuit to a capacitor C.27 -One side of the capacitor is normally held at ground. When the switch is thrown, the capacitor turns the input transistor off while being charged. To work correctly, C must be less that .01 yf. (See Fig. 10.)The output is a standard pulse if no dc current is drawn. The output voltage is normally - 6 v. Up to 85 ma. can be grounded during a pulse. The maximum pulse rate is 10^  pulses per second. (See Fig. 11 for circuit details.)2. The second -type of pulse amplifier is given the symbol shown in Fig. 12.The input is a standard diode gate. The output is the same as for the first pulse amplifier. (For circuit details, see Fig. 14A.)pulse inputFig. 12FIRST PULSE AMPLIFIER- 28 ->10hDAnHDO-2Da:DOD(LZTRANSISTORS: 2NI305- 29 -3. The third pulse amplifier is given the symbol shown in Fig. 13.TO o gatestandard pulse output o- special pulse output o- -o inputFig. 13It is the same as the second pulse amplifier except that a special output is added. This special output is normally at -15 v (4.7 K output impedance) but during a pulse, it changes to 0 v while grounding up to 15 ma. (For circuit details, see Fig. 14B.)Level Change StandardizationA change from a standard lower logic level to an upper level results in a 10 v to 15 v level change. This change must be standardized to 6 v if it is used to trigger a standard diode gate. The circuit of Fig. 15 accomplishes this.input o- L C S -o outputSymbolFig. 15- 30 -F I G U R E  1 4 a  P U L S E  A M P L I F I E RS Y M B O LCIRCUITF I G U R E  1 4 b  P U L S E  A M P L I F I E RSYMBOLC I R C U I T31 -Other Symbols and CircuitsThe following symbols and circuits will be used:A)inputo-gateo 0-o outputSymbolNote: The output of this circuit will change from 0 v to -15 vfor about 12 msec when the input is switched from open circuit to ground. This output occurs if the gate is grounded but is inhibited if the gate is open circuited. There is about 70 msec delay in the gate.Fig. 16- 32 -B) First Driverinput o- R D 1 -ooutputSymbolNote: Multiple output equivalent to single output.This circuit allows use of transistors on hand.Fig. 17- 33 -C) Second Driverinputo- R D 2 -o outputSymbolCircuitFig. 18D) Third DriverAo-B°" 2c°~R D 3 -> outputSymbol+10 vCircuitFig. 19- 34 -E) Or GatesA-B-SymbolA o- + 6 -■K-Circuit-o C22 K-AA.B-c-SymbolF) And GatesA-BSymbolDFig. 20Fig. 21-H-1+A —B —C H < —Circuit■ H eCircuit68 K-o DFigs. 22, 23, 24, 25, and 26 show the logic circuit cards which are made. Each circuit card has 23 terminals. It is assumed that terminals 12, 13, and 23 will be used for ground, +10 volts and -15 volts respectively. The terminal connections for each circuit are indicated by numbers.FIGURE 22 CIRCUIT ON CARD CA | FIGURE 23 CIRCUIT ON CARD CB- 35 -CVJ CVJ 'O   <02•FIG FURII ECOU ONRTE LIRI PA6SD A-; A3SUSED IN THE ROTATION COUNTER CODER.QOQa.<o2ODO£O10CV1Ula.DOo •Qa:<o z oDOcrCVJua.D0- 37 -F I G U R E  2 6  C I R C U I T  ON C A R D  CE2 I14F IG U R E  2 7  C O N T R O L  U N IT-  38 -T E L E T Y P E  C O N T R O L C L E A R .  T O  P IN  K O F T E L E T Y P E  C O N T R O L  M O D U L E  W 9 9 4  BR O T A T I O N  C O U N T E R  H O LD . T O  P IN S  C A 3 . 8 ,  15 a  2 0  O F R O T A T IO N  C O U N T E R  C O D E RD V M  H O L D .T O  P I N  18 OF C O N N E C T O R  J 4  O F  D V MTO  L I N E  S E L E C T I O N  R E L A Y ST O  M O T O R  O IR E C T IO N  - <  R E L A YTO  M O T O RO N  -  O F F  ~ <R E L A YT O  R E A D  M IC R O S W IT C HL I N E  T O  L A T H E  T E R M I N A L  S T R I PLINE TO CONTROL PANELLINE TO CONTROL UNIT- 39 -F I G U R E  2 8  C O N T R O L  P A N E LT E R M I N A L  S T R I PSI - R E C O R DS 2 - S T A R T  R U NS 3 - D I R E C T I O N ,  L E F TS 4 - D I R E C T I O N ,  R I G H TS 5 - R E S E TS 6 - A U T O M A T I C  M O D E  P A U S ES 7 - M A N U A L  M O D E  P A U S Es e - M O T O R ,  O N  -  O F F  ( S H O W N  IN  O F F  P O S I T I O N )S 9 - A U T O M A T IC  -  M A N U A L  M O D E  S W I T C H  ( S H O W N  IN M A N U A L  M O D E )S IO - END R E C O R DS l l - E M E R G E N C Y  O F FS 12 _ O V E R R ID E- 40 -F I G U R E  2 9  M O T O R  C O N T R O L  C I R C U I T-  41 -F I G U R E  3 0  C I R C U I T  F O R  L A T H E  L I M I T  S W I T C H E SF I G U R E  31 R E A D  M I C R O S W I T C H  C I R C U I TT O  C O N T R O L  U N ITTO  C O N T R O L  P A N E LFIGURE 32 ROTATION COUNTER CODER FIGURE 33 CODE USED ON ALL DATA LINES- 42 ->- _i UJ>UJQ CD * £ID - 1 UJ< > UJ _1COUJ -C? 5 -1 « ■ow 10TJcCVJHZS A V 1 3 y  N O I A 3 3 T 3 S  3 N I 1  OJ.  / \ _________________________________O O Q O QQ9 9NX- 43 -F I G U R E  3 4  Z  D I G I T  R O T A T I O N  C O U N T E R  C O D E R S- 44 -F I G U R E  3 5  X &  Y  D I G I T  R O T A T I O N  C O U N T E R  C O D E R S>- 45 -F I G U R E  3 6  S E L E C T I O N  R E L A Y ST O  D R IV E R  R DI O F C O N T R O L  U N ITT Y P I C A L  R E L A Y  F O R  O N E  OF T H E  S E V E N  B C D  D A T A  L I N E S- 46 -Line or digit numberBCD level or conductor letterDVM line Rotationp  D 1 1 t" 0  ■v*Teletype control linewirecolorselection relay connector pin no.teletype control module pin no.wirecolorconverter output pin no.L .O U .I lL c irlinewirecolor1 A to ground 0 R 1 W994A(1)EB Y 23 0 Y 2 ” (2)EC P 25 0 G 3 " (3)ED to ground 0 P 4 " (4)E2 A R 1 0 R 5 " (1)HB Y 2 0 Y 6 " (2)HC G 3 0 G 7 " (3)HD P 4 0 P 8 " (4)H3 A R 5 0 R 9 " (1)KB Y 6 0 Y 10 " (2)KC G 7 0 G 11 " (3)KD P 8 0 P 12 " (4)K4 A R 9 R R 13 " (1)MB Y 10 Y Y 14 " (2)MC G 11 G G 15 " (3)MD P 12 P P 16 " (4)M5 A R 13 R R 19 " (1)PB Y 14 Y Y 20 " (2)PC G 15 G G 21 " (3)PD P 16 P P 22 " (4)P6 A R 22 R R 23 " (1)SB to ground Y Y 24 " (2) SC G 24 G G 25 " (3) SD to ground P P 26 " (4) S7 A R 19 R R 27 " (1)UB Y 20 Y Y 28 " (2)UC G 21 G G 29 " (3)UD to - 15 v P P 30 " (4)UFig. 37Connections to the selection relaysDATA LINE SELECTION UP COUNTER- 1+7 -F I G U R E  3 8  T E L E T Y P E  C O N T R O L  U N IT*  I N D I C A T E S  A  D IO D E  O F  R O O I  O R  R 0 0 2  U S E D .D A T A  L I N E S  (B C D F R O M  S E L E C T O R  R E L A Y SOUTPUT TO TELETYPE DATA RELAYSF I G U R E 3 9  S P E C I A L  T E L E T Y P E  C O N T R O L  M O D U L E S- 48 -M O D U L E  W 0 51  MV-O DNOTE: DIODE 04  WASINCORRECTLY INSTALLED BY MANUFACTURER.-O F-O  JO  LO  NO  RO  T2 • F I 0F I G U R ET H EI N °- 49 -4 0  M O D U L E  W 9 9 4  A  C L A M P E D  I N T E R F A C I N G  I N V E R T E R4  M A D ES Y M B O L S  IN T H E  A B O V E  M O D U L E  R E F E R  T O  T H E  C I R C U I T  B E L O W> " 5 4 7 ; 8S Y M  B O Li N P U Tl O v  T O  — 15  vO U T P U T { C I R C U I T— 3 . 2  v  T O  — 3 . 9  V O V- 50 -F I G U R E  41 M O D U L E  W 9 9 4  BE O -K O -A  O -B O -2 ^ X 3 ------------- ^ > 0 --------------O3^>0- - O  L+  l O v  I N P U TF I 1 5 v  I N P U TC O -D O -G R O U N D  I N P U TG I 3 . l v  T O  —3 . l 5 v  ( u n lo a d e d )  O U T P U TC I R C U I T-  51 -F I G U R E  4 2 T E L E T Y P E  C O N T R O L- 1 2  vP K _  T O  T E L E T Y P E  C O N T R O L115 ACO--OperatR E A D E R  T R IP  M A G N E TT E L E T Y P E  C O N N E C T O R  No. 6T E L E T Y P E  R E A D E R  C O N T A C T  B L O C K  A AD IS T R IB U T O R  C L U T C H  T R IP  C O IL  R E L A Y-12 vT O  D A T A  O U T P U T  > D R I V E R S  O F  T E L E T Y P E  C O N T R O LR E L A Y S- 52 -Power Supplies1 v, +10 v: Digital Equipment Corporation Model 783. 2* “12 v for teletype associated relays of Fig. 42.Fig. 43. -12 v for line selection relays and motor control relays.1%A SBFig. 44Note: All three power supplies are turned on by the control logic ON - OFF switch.m im iw  - : ^ -:r :‘l -  \ - : . \ rO D - ; --.v..-:.. ;-V ’ ^  ;. C":». . ’r - . r  : - . . s  ■%■ ^  v  ,» :.s , ■  , ' v c  , .' . r • - . .  ,  —  : ••. " - " . v ; i j . .  :;-_4mi- v?x xvxxx/x-:-: ixx ..... . x  :

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