User Manual
Contents
1. 16 CH PROGRAMMABLI DISCRIMINATOR R Mod C207 REMOTE or LOCAL E e SELECTION Tee OR gt L OR Output gt lt Current Sum Output 6 Z Test Inputs E nputs0 7 gt eh T Veto Inputs E Ee Js Outputs Group L 15 O e 4 LOCAL LED lt ORLED R Outputs Group B gt 15 oo Inputs 8 15 gt o 10 11 j 8 9 Threshold setting amp THR O lt Width setting Trimmer Trimmer and O D Test Point FRONT PANEL BACK PANEL Fig 2 1 C207 Front and Back Panels CAEN 25 01 96 C207 User s Manual CH7 CH6 CH5 CH4 CHS ii STi 1 ST14 oia HERE SOLDERINGS SIDE VIEW CH12 CH13 CH10 CH11 CH8 CH9 Fig 2 2 C207 Range Selection Jumpers Location CAEN 25 01 96 C207 User s Manual 3 OPERATING MODES 3 1 GENERAL INFORMATION The CAEN Model C207 is a 16 CHANNEL PROGRAMMABLE DISCRIMINATOR housed in a 1 unit wide CAMAC module The module accepts 16 negative inputs via 16 front panel LEMO 00 type connectors INPUTS 0 to 15 and produces 16 differential ECL outputs with a FAN OUT of two for each channel that are available on two front panel flat c2. 9 LIST OF TABLES Table 4 1 Mod C207 CAMAC Funclions nennen nennen nennen nnn 12 CAEN 25 01 96 C207 User s Manual 1 DESCRIPTION 1 1 FUNCTIONAL DESCRIPTION The CAEN Model C207 is a 16 CHANNEL PROGRAMMABLE DISCRIMINATOR housed in a 1 unit wide CAMAC module a functional block diagram is shown in Fig 1 1 The module accepts 16 negative inputs via 16 front panel LEMO 00 type connectors INPUTS 0 to 15 and produces 16 differential ECL outputs with a FAN OUT of two for each channel that are available on two front panel flat cable connectors OUTPUTS 0 to 15 A and B Each channel consists of a discriminator on a hybrid circuit and an 8 bit DAC for the threshold setting The Timing Stage of the discriminator works in UPDATING mode It produces an output pulse whose width is independent from the input signal time over threshold and adjustable in two ranges via the front panel common trimmer WDT 16 internal jumpers one per channel allow the range setting The module s operations can be controlled either via CAMAC or locally A front panel LOC LED indicates when lit that the module is controllable locally A back panel switch disables the REMOTE operations and sets the module in LOCAL mode LOC LED is ON Each channel has its own discriminating threshold programmable via CAMAC and can be turned on or off via CAMAC by using a mask Register Pattern of Inhibit The
3. adjustment of the output pulses It is possible for each channel to have two adjustment ranges by setting the corresponding jumpers JP1 to JP16 as previously shown in Fig 2 2 for the short range setting The two selectable ranges are 4 ns 40 ns 40 ns 300 ns The position of the jumpers can also be deducted from the solderings side of the board the layout of the board contains a printed pattern with indications on Short Time ST or Long Time LT setting for the i th channel see fig 3 2 The jumper has to short circuit the middle pin hole with the desired external pin hole as in Figure 3 2 LTi Long Time Selection Short Time 2 Selection STi Fig 3 2 Pattern for the Time Range setting of the i th channel CAEN 25 01 96 C207 User s Manual 3 6 FRONT PANEL SIGNALS Some operations can be performed by two external NIM signals indicated on the back panel connectors with VETO TEST e TEST an input signal sent through this connector triggers all the enabled channels at once This useful feature allows a complete test of the module without removing any input cable as well as it allows generation of a pattern of pulses suitable to test any following electronics e VETO an input signal sent through this connector allows vetoing of all channels simultaneously A veto pulse of width T will veto the input during this time T Its leading edge must precede the input leading edge by at least 7
4. automatically the status of the Q line 10 CAEN 25 01 96 C207 User s Manual 3 9 LOCAL MODE OPERATION With the back panel switch in the LOC position the module is in LOCAL mode LOC LED is ON At Power On the bits of the Pattern of Inhibit and Threshold Registers are all set to 1 all channels are enabled but the thresholds of the Threshold Register are not active A common threshold must be set via front panel trimmer A front panel test point provides a monitoring of the threshold in a range 6 mV to 512 mV Once the threshold is set the module is ready to operate All inputs exceeding the threshold value will produce an output pulse of width that can be set via front panel trimmer In LOCAL mode the CAMAC readout of the Pattern of Inhibit and Threshold Registers F 0 N A 0 15 F 1 N Functions is active all bits must be 1 otherwise the module is not working correctly If the User switches the module from REMOTE to LOCAL while it is still powered the module will behave as above the bits of the Pattern of Inhibit and Threshold Registers are all set to 1 If the User switches the module from LOCAL to REMOTE while it is still powered the module will maintain its registers configuration i e the bits of the Pattern of Inhibit and Threshold Registers are still set to 1 and need to be set again via 11 CAEN 25 01 96 C207 User s Manual 4 CAMAC FUNCTIONS The standard CAMAC Functions listed in Tabl
5. thresholds can be set in a range from 0 mV to 510 mV 2 mV step though for proper functioning a minimum threshold of 6 mV is required In LOCAL mode a common threshold can be set and monitored respectively via front panel trimmer and test point Moreover the Pattern of Inhibit is disabled all channels are enabled and the CAMAC functions are ineffective Some operations can be also performed using two external NIM signals indicated on the back panel connectors with VETO and TEST VETO an input signal sent through this connector allows vetoing of all channels simultaneously A veto pulse of width T will veto the input during this time T TEST a pulse sent through this connector triggers all the enabled channels at once all channels in LOCAL mode This useful feature allows a complete test of the module without removing any input cable as well as it allows generation of a pattern of pulses suitable to test any following electronics These are high impedance inputs and each one is provided with two bridged connectors for daisy chaining On the front panel there is also available a Current Sum output that generates a current proportional to the input multiplicity i e to the number of channels over threshold at a rate of 1 0 mA per hit 50 mV per hit into a 50 Q load 10 An OR output signal on a front panel connector provides a global OR of the Shaped Outputs An OR LED lights up if at least one of the unma
6. 0 type These are the back panel connectors for the veto input signal that can be daisy chained No 2 TEST LEMO 00 type These are the back panel connectors for the test input signal that can be daisy chained DISPLAYS No 1 LOC red LED lit up if the module is in LOCAL mode No 1 OR green LED lit up if at least one channel is over threshold TRIMMERS SWITCHES No 1 WDT screw driver trimmer for the common output signals width adjustment No 1 THR screw driver trimmer for the common threshold adjustment in LOCAL mode No 1 REM LOC back panel switch for the operating mode REMOTE or LOCAL selection TEST POINTS No 1 THR test point for the common threshold monitoring 2 3 INTERNAL CONNECTORS 25 01 96 C207 User s Manual COMPONENTS No 16 JP1 JP16 LTi STi Jumpers for the width range selection 2 4 CHARACTERISTICS OF THE SIGNALS INPUTS INPUT CHANNELS THRESHOLD VETO TEST negative polarity 50 O impedance maximum absolute ratings 5 Volts input offset voltage 5 mV reflections lt 4 for 2 ns risetime pulses 6 mV to 510 mV 2 mV step in programmable mode continuous set in Local mode via front panel trimmer monitor test point on front panel with range 6 mV to 510 mV std NIM level high impedance minimum width 10 ns veto leading edge must precede of at least 7 ns the input leading edge and overlap co
7. 25 01 96 C207 User s Manual TABLE OF CONTENTS TABBE OE CONITENTS7 iiit hides er eee e este tte yl ge i LIST OF FIGURES ung pm t a aa a as i 1 i Fee DESCRIPTION uuu t nuan e 1 1 1 FUNCTIONAL DESCRIPTION 1 2 SPECIFICAT ON S su u RED HERE yaka t RAP kak aka 3 2 1 PACKAGING het ei 3 2 2 EXTERNAL COMPONENTS a 3 2 3 INTERNAL COMPONENTS nennen nnn trennen nnn nennen nnn 4 2 4 CHARACTERISTICS OF THE SIGNALS sss 4 2 5 GENERA onte tito ree 5 2 6 POWER 1 5 3 OPERATING MODE Sis ir P sana 8 3 1 GENERAL INFORMATION ssssseseeeeeenereeen nennen tnnt nnne nnne 8 3 2 MOD C207 POWER ON AND RESET 4er nnns 8 3 8 ENABLING DISABLING OF THE 5 8 3 4 THRESHOLDS SET FNG a a aeaa aana asas anaku kula qd 8 3 5 OUTPUT PULSES nt eite 9 3 6 FRONT PANEE
8. Function tests the status of the Q line The Q response is generated and held if at least one channel is over threshold The Q line is cleared with the F 2 N Function 12 CAEN 25 01 96 C207 User s Manual 4 4 F 16 N A 0 15 FUNCTION Write Discriminator Thresholds This CAMAC Function writes in the 8 bit Threshold Register via write lines W1 W8 subaddresses 0 through 15 select the different channels 0 through 15 For each channel the Threshold Register contains the value of the threshold and it can be read via CAMAC F 0 N A 0 15 Function 4 5 F 17 N FUNCTION Write Pattern of Inhibit This CAMAC Function writes the 16 bit Pattern of Inhibit Register via write lines W1 W16 each bit set to 1 corresponds to an active Discriminator channel 4 6 F 25 N Common Test This CAMAC Function allows the testing of the module it triggers all discriminator outputs at once 4 7 I Veto All Channels This CAMAC Function vetoes all channels It has no effect on the TEST input or the F 25 N Function 4 8 F 9 N C Z Reset Module This CAMAC Function resets the module this causes the following the Pattern of Inhibit bits are set to 1 all channels enabled the Q response on F 2 N is cleared 13 CAEN 25 01 96 C207 User s Manual APPENDIX A ELECTRICAL DIAGRAMS A 1 COUQI IOU2 p wiel JUSI pf CVEU 1609
9. SIGNALS iecit Pa detiene Laus 10 3 7 CHANNELS TES T netten dite titer cater sett pd aaa dla 10 3 9 MODULE OPERATION dei re tete e e E qt 10 3 9 LOCAL MODE OPERATION 11 4 QAMAG FUNGTIONS citet eset heh taa sag ei depre e Ete aed 12 4 1 F 0 N A 0 15 FUNCTION Read Discriminator Thresholds 12 4 2 F 1 N FUNCTION Read Pattern of 12 4 3 F 2 N FUNCTION Test Activity 12 4 4 F 16 N A 0 15 FUNCTION Write Discriminator Thresholds 13 4 5 F 17 N FUNCTION Write Pattern of Inhibit 13 4 6 du 5y N Gommorn Test e bett tem qa a Oa a 13 4 7 l Veto AIIl Gharnnels errem e 13 4 8 F 9 C Z Reset Module uuu uuu uu u aange ae aaa nennen nennen nnn 13 APPENDIX A ELECTRICAL DIAGRAMS a A 1 LIST OF FIGURES Fig 14 G207 Block Diagram eodeni tete ette P eain Dc D ge ro a de uoo 2 Fig 2 1 C207 Front and Back Panels n 6 Fig 2 2 C207 Range Selection Jumpers 7 Fig 3 1 Organization of the threshold registers T0 T15 9 Fig 3 2 Pattern for the Time Range setting of the i th channel
10. able connectors OUTPUTS 0 to 15 A and B Paragraphs 3 2 to 3 8 describe the various operations that can be done via CAMAC in order to use the C207 module in REMOTE mode Paragraph 3 9 describes the operations that can be done in order to use the C207 module in LOCAL mode 3 2 MOD C207 POWER ON AND RESET With the back panel switch in the REM position the module is in REMOTE mode At Power On the contents of the Pattern of Inhibit and Threshold Registers are not determined A reset of the module and a setting of the Registers must be performed before any other operation It is possible to reset the C207 by performing a C Z command or a F 9 N CAMAC Function After this operation the C207 is initialized this causes the following all channels are enabled all bits of the Pattern of Inhibit are set to 1 the Q response on the F 2 N Function is cleared The RESET operation doesn t affect the content of the Threshold Registers 3 3 ENABLING DISABLING OF THE CHANNELS The User can enable or disable each of the 16 channels via CAMAC by performing a F 17 N CAMAC Function with the Write Lines W1 W16 set to 1 or 0 according to the chosen configuration 16 bit Pattern of Inhibit A channel is enabled if the corresponding bit of the Pattern is high e g bin 0000000000001 100 or hex 0006 enables channels 2 and 3 of the discriminator A F 1 N CAMAC Function allows to read out the Pattern of Inhibit configuration It is also
11. e 4 1 allow the user to perform the required control and readout operations on the C207 module X response is generated for each valid function Q response is generated in REMOTE Mode only for each valid function unless otherwise specified Table 4 1 Mod C207 CAMAC Functions F 0 N A 0 15 3 Reads the Discriminator Thresholds on R1 R8 F 1 N Reads the Pattern of Inhibit on R1 R16 F 2 N Tests the module activity and clears the Q line Q response if at least one channel is over threshold F 16 N A 0 15 Writes the Discriminator Thresholds W1 W8 F 17 N Writes the Pattern of Inhibit on W1 W16 F 25 N Common Test Vetoes the channels via F 9 N C Z Resets the module Q response also in LOCAL mode 4 1 F 0 N A 0 15 FUNCTION Read Discriminator Thresholds This CAMAC Function reads the 8 bit Threshold Register on read lines R1 R8 subaddresses 0 through 15 select the different channels 0 through 15 For each channel the Threshold Register contains the value of the threshold set via CAMAC Read lines R9 R16 are set to 1 In LOCAL mode the R1 R16 lines are all set to 1 4 2 F 1 N FUNCTION Read Pattern of Inhibit This CAMAC Function reads the 16 bit Pattern of Inhibit Register on read lines R1 R16 each bit set to 1 corresponds to an active Discriminator channel In LOCAL mode the R1 R16 lines are all set to 1 4 8 F 2 N FUNCTION Test Activity This CAMAC
12. mpletely the input signal std NIM level high impedance maximum frequency 125 MHz minimum width 5 ns These inputs are at high impedance and each one is provided with two bridged connectors for daisy chaining Note that the high impedance makes these inputs sensitive to noise so the chains have to be terminated on 50 Q on the last module the same is needed also if one module only is used whose inputs have thus to be properly matched OUTPUTS CHANNELS CURRENT SUM gt differential ECL level into 110 twisted pair pulse width continuously adjustable via trimmer in two ranges 4 40 ns approx 40 900 ns approx range selection via internal jumpers Input Output delay 8 1 ns Test Output delay 13 ns Risetimes and Falltimes lt 3 ns high impedance current source current proportional to the input multiplicity rate 1 0 mA per hit 50 mV hit into a 50 Q load 14 offset 60 mV approx no channel over threshold CAEN 25 01 96 2 5 GENERAL Double pulse resolution 7 5 ns Maximum frequency 125 MHz Interchannel isolation better than 50 dB Time slewing lt 400 ps for input amplitudes from 2x to 20x over threshold 2 6 POWER REQUIREMENTS 24 V 25 mA 12V 15 mA 12V 30 mA 6 V 500 6 V 3 4 A C207 User s Manual CAEN 25 01 96 C207 User s Manual
13. ns and overlap completely the input signal These are high impedance inputs and each one is provided with two bridged connectors for daisy chaining Note that the high impedance makes these inputs sensitive to noise so the chain has to be terminated on 50 on the last module the same is needed also if one module only is used whose inputs have thus to be properly matched The VETO has no effect on the TEST input or the F 25 CAMAC Function On the front panel there is also available a Current Sum output connector that generates a current proportional to the input signal multiplicity i e to the number of channels over threshold at a rate of 1 0 mA per hit 50 mV per hit into a 50 Q load 10 An OR output connector provides the Logical OR of the Output channels 3 7 CHANNELS TEST It is possible to obtain pulses on all channels by sending a NIM pulse through one of the two TEST connectors located on the front panel by performing a F 25 N CAMAC Function 3 8 MODULE OPERATION Once the thresholds are set and the desired channels are enabled via the Pattern of Inhibit Register the module is ready to operate All inputs exceeding the threshold value will produce an output pulse of width that can be set via front panel trimmer A F 2 N CAMAC Function tests the activity of the module if at least one of the unmasked channels is over threshold this Function returns a Q 1 value see 4 3 This Function clears
14. possible to inhibit all channels via a CAMAC Inhibit operation The CAMAC Inhibit has no effect on the TEST input or the F 25 CAMAC Function 3 4 THRESHOLDS SETTING The discriminating thresholds can be programmed in a range from 0 mV to 510 mV in steps of 2 mV though for proper functioning a minimum threshold of 6 mV is required It is possible to set via CAMAC independent thresholds for each channel 16 eight bit registers TO T15 are accessible via CAMAC for the thresholds setting and monitoring The structure of these registers is shown in the following figure CAEN 25 01 96 C207 User s Manual 7 6 5 4 3 2 1 0 Threshold channel n Fig 3 1 Organization of the threshold registers TO T15 The bits lt 7 0 gt show the threshold absolute value of the channels the weight of the LSB is 2 mV In order to write the thresholds for each channel the User must perform a F 16 N A i CAMAC Function where subaddress i selects the i th channel The chosen value of the thresholds must be present on the CAMAC Write lines W1 W8 The thresholds can be read back for each channel the User must perform a F 0 N A i CAMAC Function where subaddress i selects the i th channel The chosen value of the thresholds is present on the CAMAC Read lines R1 R8 3 5 OUTPUT PULSES The width of the output signals does not depend on the time over threshold of the input signals The front panel trimmer WDT allows a common manual
15. sked channels is over threshold C207 User s Manual CAEN 25 01 96 DAC TEST INHIBIT R W LOGIC PARAE 8 bit 8 bit 8 bit 8 bit inhibit THR DAC DAC DAC DAC chi4 ch 15 THRESHOLDS CAMAC Qu INTERFACE za INPUTS lt 0 15 gt OR LED 9 L hybrid H hybrid hybrid H hybrid discr discr disc lt WDT va ch 0 amp 1 ch 283 ch 12813 ch 14 amp 15 VETO i n QUTPUTS 0 155 OR OUT Fig 1 1 6207 Block Diagram CAEN 25 01 96 C207 User s Manual 2 SPECIFICATIONS 2 1 PACKAGING 1 unit wide CAMAC module 2 2 EXTERNAL COMPONENTS CONNECTORS No 16 INPUT 0 15 LEMO 00 type These are the connectors for the input signals No 2 OUTPUTS 0 15 A B double row strip header 17 17 pin These connectors deliver the output signals No 1 gt LEMO 00 type It delivers a current proportional to the input multiplicity i e to the number of channels over threshold at the rate of 1 0 mA per hit 50 mV per hit into 50 Q load 10 No 1 OR LEMO 00 type It provides a signal that is the OR of the Output shaped signals No 2 VETO LEMO 0
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