OPERATOR’S MANUAL MODEL 3341 CAMAC 8-INPUT CHARGE ADC 1 Innovators in Instrumentation Corporate Headquarters 700 Chestnut Ridge Road Chestnut Ridge, NY 10977-6499 Tel: (914) 578-6013 Fax: (914) 578-5984 E-mail: [email protected] WWW: http://www.lecroy.com European Headquarters 27 Blacklands Way Abingdon Business Park Abingdon Oxon OX14 1DY United Kingdom Tel: (1235) 533114 Fax: (1235) 528796 E-mail: [email protected] Copyright© November 1995. LeCroy™ is a registered trademark of LeCroy Corporation. All rights reserved. Information in this publication supersedes all earlier versions. 2 CAUTION POWER REQUIREMENTS The Model 3341 requires both +12 V and -12 V in addition to +6 V, -6 V, +24 V and -24 V supplies for proper operation. SPECIFICATIONS The information contained in this manual is subject to change without notice. The reference for product specification is the Technical Data Sheet effective at the time of purchase. 3 4 TABLE OF CONTENTS 1. General Information Purpose 5 Unpacking & Inspection 5 Warranty 5 Product Assistance 5 Maintenance Agreements 5 Documentation Discrepancies 6 Software Licensing Agreement 6 Service Procedure 6 2. Operating Instructions General 7 Analog Inputs 8 CLEAR Function 8 External GATE Input 8 ADC Thresholds and Offset Memory 8 Test Function 10 Overflow 10 Status Register 10 ECL Data Bus 12 ECL BUS - Command 12 ECL Port Enable/Pass 13 ECL Bus Readout Interrupt 14 ECL Data Structures 14 CAMAC Commands and Functions 15 CAMAC Readout 17 LAM Handling 18 CAMAC Data Structures 18 Readout Timing Diagram 20 2. Technical Information General 23 Description 23 Autotrigger Mode (Single Channel Mode) 26 E Input LEMO Connector 27 Analog Inputs, Impedance, Attenuation and Connection 27 5 6 GENERAL INFORMATION PURPOSE This manual is intended to provide instruction regarding the setup and operation of the covered instruments. In addition, it describes the theory of operation and presents other information regarding its functioning and application. UNPACKING AND INSPECTION It is recommended that the shipment be thoroughly inspected immedi- ately upon delivery. All material in the container should be checked against the enclosed Packing List and shortages reported promptly. If the shipment is damaged in any way, please notify the Customer Service Department or the local field service office. If the damage is due to mishandling during shipment, you may be requested to assist in contacting the carrier in filing a damage claim. WARRANTY LeCroy warrants its instrument products to operate within specifications under normal use and service for a period of one year from the date of shipment. Component products, replacement parts, and repairs are warranted for 90 days. This warranty extends only to the originalpur- chaser. Software is thoroughly tested, but is supplied "as is" with no warranty of any kind covering detailed performance. Accessory products not manufactured by LeCroy are covered by the original equipment manufacturers’ warranty only. In exercising this warranty, LeCroy will repair or, at its option, replace any product returned to the Customer Service Department or an authorized service facility within the warranty period, provided that the warrantor’s examination discloses that the product is defective due to workmanship or materials and has not been caused by misuse, neglect, accident or abnormal conditions or operations. The purchaser is responsible for the transportation and insurance charges arising from the return of products to the servicing facility. LeCroy will return all in-warranty products with transportation prepaid. This warranty is in lieu of all other warranties, express or implied, includ- ing but not limited to any implied warranty of merchantability, fitness, or adequacy for any particular purpose or use. LeCroy shall not be liable for any special, incidental, or consequential damages, whether incon- tract, or otherwise. PRODUCT ASSISTANCE Answers to questions concerning installation, calibration, and use of LeCroy equipment are available from the Customer Service Department, 700 Chestnut Ridge Road, Chestnut Ridge, New York, 10977-6499, (914) 578-6030. MAINTENANCE AGREEMENTS LeCroy offers a selection of customer support services. For example, Maintenance Agreements provide extended warranty that allows the customer to budget maintenance costs after the initial warranty has expired. Other services such as installation, training, on-site repair, and addition of engineering improvements are available through specific Supplemental Support Agreements. Please contact the Customer Service Department for more information. 7 DOCUMENTATION DISCREPANCIES LeCroy is committed to providing state-of-the-art instrumentation and is continually refining and improving the performance of its products. While physical modifications can be implemented quite rapidly, the corrected documentation frequently requires more time to produce. Consequently, this manual may not agree in every detail with the accompanying product and the schematics in the Service Documentation. There may be small discrepancies in the values of components for the purposes of pulse shape, timing, offset, etc., and, occasionally, minor logic changes. Where any such inconsistencies exist, please be assured that the unit is correct and incorporates the most up-to-date circuitry. SOFTWARE LICENSING AGREEMENT Software products are licensed for a single machine. Under this license you may: n Copy the software for backup or modification purposes in support of your use of the software on a single machine. n Modify the software and/or merge it into another program for your use on a single machine. n Transfer the software and the license to another party if the other party accepts the terms of this agreement and you relinquish all copies, whether in printed or machine readable form, including all modified or merged versions. SERVICE PROCEDURE Products requiring maintenance should be returned to the Customer Service Department or authorized service facility. If under warranty, LeCroy will repair or replace the product at no charge. The purchaser is only responsible for the transportation charges arising from return of the goods to the service facility. For all LeCroy products in need of repair after the warranty period, the customer must provide a Purchase Order Number before any inoperative equipment can be repaired or replaced. The customer will be billed for the parts and labor for the repair as well as for shipping. All products returned for repair should be identified by the model and serial numbers and include a description of the defect or failure, name and phone number of the user. In the case of products returned, a Return Authorization Number is required and may be obtained by contacting the Customer Service Department at (914) 578- 6030. 8 OPERATING INSTRUCTIONS GENERAL The Model 3341 QADC incorporates 8 analog memories used to simulta- neously store 8 charge signals to be analyzed. The analog memories outputs are routed, through an analog multiplexer, to a fast analog-to-digital converter (3 m sec) featuring offset control and two thresholds: a lower (LLD) and an upper (ULD) threshold. This makes it possible to assign different threshold and offset (zero energy intercept) values to each measuring channel. A "Parameters Memory(cid:211) contains the LLD, ULD and OFFSET values of each single channel, as well as the common threshold value. A 6-bit register (STATUS REGISTER) allows different data acquisition and readout modes of the 8 measuring channels. Data may be read out either via CAMAC or via the ECL Data Bus, depending upon the pro- gramming of the Status Register. Both the Status Register and Parameters Memory must be previously loaded via CAMAC. If enabled, the ECL Data Bus, located on the front panel, sends analog- to-digital conversion data sequentially in words of 16 bits with differential ECL levels (the first 12 bits are data bits plus 3 subaddress bits, plus the (cid:210)Overflow(cid:211) bit, if it exists). A REQ output signal is generated when the ECL Data Bus is ready to deliver data. In CAMAC mode, data is always read in 16 bit words in either sequential (Q stop mode) or addressed mode. When data is ready, a LAM signal may be generated and there is Q=1 with the readout function N.F(0) or N.F(2). The instrument includes provisions for testing the 8 input modules of the 3341 via a CAMAC controlled TEST signal with function N.F(25) A(0). This signal simulates a GATE command and applies a charge corre- sponding to about 1/2 of the dynamics to the input of each channel. The ADC may be in two states: (cid:210)Idle(cid:211) or (cid:210)Busy(cid:211), depending on the GATE, CLEAR and internal CLEAR signals. (Internal CLEAR is applied after a conversion if here is no valid data or when data readout is performed in sequential mode.) GATE and CLEAR signals may be sent either via front-panel (ECL Command Bus) or via CAMAC. After a CLEAR signal the ADC is in the (cid:210)Idle(cid:211) state, that is, it is ready to receive a GATE signal (front-panel or test). The Status Register and the Parameters Memory may be loaded only when the module is in the (cid:210)Idle(cid:211) state. The GATE signal (front-panel or test) causes the ADC to go to the (cid:210)Busy(cid:211) state, during which no further GATE signal is allowed. Data conversion is enabled approximately 1 m sec after the GATE signal, and at the end of 9 the conversion time data readout is initiated. At this point, depending on the state of the Status Register and the data converted by the ADC, any of three conditions may occur: 1. Data read out via ECL port only (EEN = 1, see Status Register). 2. Data read out via CAMAC only (EEN = 0). 3. No data to be read. In this case, no data readout is performed. During the (cid:210)Busy(cid:211) state, to disable the ongoing data conversion or to accept further GATE signals, it is necessary to apply a CLEAR signal. The ADC is ready to perform a new data acquisition 1.2 m sec after the CLEAR signal. Analog Inputs The 8 analog inputs are designed for negative signals. The input circuit can work with any desired input impedance; it is normally provided with a 50 ohm input for coaxial cable connections, but it may also be supplied with other arrangements, for instance, a 100 ohm input suitable for twisted pair connections. CLEAR Function The CLEAR function may be enabled either by an ECL CLEAR com- mand of the front-panel ECL Bus or by CAMAC functions Z, C and N.F(9) A(0) strobed by S2 or by an internal command generated after completion of sequential data readout or at the end of conversion, if no valid data is present. After a CLEAR signal, the ADC changes to the (cid:210)Idle(cid:211) state and is held in this state until the next GATE signal is applied. During the CLEAR signal (duration of about 1.2 m sec) the input GATE is inhibited. It is recommended to avoid sending new GATE commands in coinci- dence with the end of the CLEAR signal. This will prevent generation of sliced GATE commands. External GATE Input The GATE command should be sent only when the module is in the (cid:210)Idle(cid:211) state. It should never be sent in coincidence with the CLEAR signal (at least 1.2 m sec after the CLEAR function has been initialized). The GATE input may be inhibited by line 1 (CAMAC inhibit). A GATE signal activates the following functions: 1. Enable the integrator circuit. 2. The end of the GATE signal automatically inhibits the GATE input disabling further GATE signals. After a 1 m sec time delay it starts conversion causing the ADC to change to the (cid:210)Busy(cid:211) state. ADC Thresholds and Offset Memory The 3341 includes a Parameters Memory made up of two 16x8 word groups. With the module in the (cid:210)Idle(cid:211) state, the threshold values (Low Level Discriminator-LLD; Upper Level Discriminator ULD), as well as the offset, Common Threshold and VSN (Virtual Station Number) values can be loaded into the Parameters Memory. Different threshold (ULD and LLD) and offset values may be assigned to each input; whereas the threshold is common to all the 8 input modules. 10