Model 745 DIGITAL DELAY/PULSE GENERATOR USER MANUAL Ver. 4.0 (Nov.
Four high resolution delay channels 0.25ps delay resolution <25ps RMS jitter max (5ps for short delay) 20s delay range (relative/absolute reference) Three trigger sources: external, internal or command Positive or Negative trigger slope Single, Repetitive or Burst trigger mode Gate mode Tunable output (magnitude 2-5V, width 100ns-10µs) 50 Ω load T0 reference output Ethernet interface (Web page) Options: 4 auxiliary high resolution delay channels (1.
Model 745 Digital Delay Generator. 2013February 14 CONTENT 1- GENERAL INFORMATION .................................................................................................... 4 What do you need to get started ....................................................................................................... 5 Unpacking Caution .......................................................................................................................... 5 Operating temperature .....................
Model 745 Digital Delay Generator. 2013February 14 EDITION Ed. Date Description 1 02/06/2011 Creation 2 06/04/2012 Modification 3 29/07/2013 Modification (new functions) 4 11/12/2013 Modification (reviewed by J.L.) © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator. 2013February 14 1- GENERAL INFORMATION The MOD745 device provides four high precision independent delay channels. Access to these four outputs (T1-T4) is given by four BNC connectors on the front panel. The achieved delay resolution is about 0.25ps, and trigger-to-channel jitter is less than 25ps (Annex B). T1-T4 can deliver up to 5V, 2ns rise time max (Annex A), into 50Ω.
Model 745 Digital Delay Generator. November 2013 What do you need to get started To set up and use the MOD745, you need the following items: • MOD745 Digital Delay Generator, • MOD745 User Manual Unpacking Caution The MOD745 is shipped in an antistatic package to prevent electrostatic damage to the device. Electrostatic discharge (ESD) can damage several components on the device. Remove the device from the package and inspect the device for loose components or any sign of damage.
Model 745 Digital Delay Generator. November 2013 2- SPECIFICATIONS Clock Input Delays Channels 4 independent delay outputs Range 0 to 20 seconds Resolution 0.
Model 745 Digital Delay Generator. November 2013 3- FRONT PANEL OVERVIEW The Model 745 front panel is composed of several kinds of elements: the user interface which consists of a keypad and an LCD display that allows the user to program various settings and to interact with the device in local mode, 4 status LEDs, 5 BNC connectors. Comment [JL1]: Figure - 1. Front panel LCD screen A 2 line x 20 character module displays parameters for programming operations and status information.
Model 745 Digital Delay Generator. November 2013 4- REAR PANEL OVERVIEW All optional output connectors/modules appear on that side of the device. The other features are listed below. Figure - 2. Rear panel Power Switch The unit is turned on by depressing the Power button. The MOD745 can be operated from 100 to 240V at a line frequency of 50-60Hz. Optional BNCs Clock input and clock output connectors are available.
Model 745 Digital Delay Generator. November 2013 5- MENU STRUCTURE (NAVIGATING THE MOD745) A three level Menu is available: • A Menu to display settings • Sub-Menus to select parameters to set • A Cursor-Mode to modify selected parameter Without option Here is given a presentation of the display menu for a standard 8 Channel Unit.
Model 745 Digital Delay Generator. November 2013 Under item #4 and #6 to #13 we get the following sub-menu: T0-T8 SUB-MENU Displayed name TX TRIG= TX RET= TX Delay= TX Ampl= TX Width= TX Gate RETURN MENU Description and settings To select Trigger source OFF= Trigger signal is inhibited IN1= Trigger signal coming from internal frequency 1 IN2= Trigger signal coming from internal frequency 2 EXT= Trigger signal coming from the front panel (TRIG IN) SS1= Single Shot trigger synchronous with internal freq.
Model 745 Digital Delay Generator.
Model 745 Digital Delay Generator. November 2013 6- OPERATING INFORMATION Operating Principles The principle of the programmable delay generator is described in the figure 4 below: Figure - 4. Principle Trigger source can be provided by the TRIG IN input, by an internal trigger, by a software command trigger. Repetitive, single shot trigger and burst modes are available with internal and external sources. An asynchronous single shot and burst mode are also available.
Model 745 Digital Delay Generator. November 2013 Burst mode The Burst mode is defined by its trigger source (internal, external, software / single shot or repetitive), its pulse number in each burst and the period between pulses. A pulse train can be independently set and defined on each channel: amplitude, width and delay are defined in the corresponding channel menu. An example of Burst mode is depicted on Figure - 9.
Model 745 Digital Delay Generator. November 2013 Timing principle using external trigger When the device is in a rest state (no current output signals), a rising edge on a trigger starts a delay sequence. The trigger comes from TRIG IN, or from a software command trigger (depending on the selected channel source).
Model 745 Digital Delay Generator. November 2013 Figure - 7. © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator. November 2013 Timing principle using internal trigger Figure - 8. Internal Trigger Timing In Internal trigger mode, two tunable frequencies are available (IN1 and IN2). On Figure - 8, T1 output uses IN1 trigger with a specified delay of 0ps and T2 output uses IN2 trigger with a non-null delay. The MOD745 must be configured (trigger, delay, etc.) before starting any sequences. The individual Channel Gate Mode is also depicted on Figure - 8.
Model 745 Digital Delay Generator. November 2013 Timing principle using Burst mode Each Channel can be independently set to Burst mode. In the following example Burst trigger has been set to IN1, Burst pulse number to 5 and Burst period to TB Figure - 9. Burst Mode Timing The minimal burst period value is 1000ns. But it has to be noticed that this value depends on the Burst trigger period value and on the Burst pulse number.
Model 745 Digital Delay Generator. November 2013 7- OPERATING EXAMPLE Default value These values are the one stored by default: • IP: 99.0.0.18 • Gateway: 99.0.0.01 • NetMask: 255.0.0.0 • Frequency1: 1000Hz • Frequency2: 1000Hz • TX Level: 5V, Width: 200ns. Initial setup Turn on the Model 745 with the rear panel power switch.
Model 745 Digital Delay Generator. November 2013 As soon as T1 is set to IN1, the front panel LED of T1 output will be on (In fact, it will blink at the output pulse rate, in that case at INternal frequency 1=1000Hz) indicating that there is an output signal on T1 connector. With an oscilloscope you can check the channel T1. Measurement should be: Rectangular shape with repetitive frequency =1000 Hz, Amplitude= 4.0V, Width = 1.0 µs.
Model 745 Digital Delay Generator. November 2013 8- PROGRAMMING Ethernet connection/communication Generality For connection over a LAN, you have to do the following: • Connect the instrument to the LAN physically, • In the graphical user interface, specify the LAN address, • On the control PC, enter the instrument’s IP address, • After the connection has been established, the following commands can be used to modify the settings: o Set’s the instrument’s IP address with: IP XXX.XXX.XXX.
Model 745 Digital Delay Generator. Example: BURST PULSE PERIOD Syntax: Form: Description: Parameter: RST value Specified limit Example: BURST PULSE NUMBER Syntax: Form: Description: Parameter: RST value Specified limit Example: GENERAL GATE MODE Syntax: Form: Description: Parameter: RST value Example: CHANNEL GATE MODE Syntax: Form: Description: Parameter: RST value Example: RELATIVE DELAY Syntax: © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator. Form: Description: Parameter: RST value Specified limit Example: November 2013 DELAY? Tx Set & Query Delay time of channel Tx relative to channel Ti (reference channel) is set to delaytime picosecond Tn: channel number 1 to 4 (or 1 to 8 for 8 channel) Ti: channel number 0 to 4 (or 0 to 8 for 8 channel) Tn and Ti have to be different delaytime: picosecond delay 0 to 19 999 999 999 999 picoseconds Set : program 1ns to channel 2 relative to channel 1 : DELAY T2, T1, 1000.
Model 745 Digital Delay Generator. WIDTH Syntax: Form: Description: Parameter: RST value Specified limit Example: EXT TRIG THRESHOLD Syntax: Form: Description: Parameter: RST value Specified limit Example: EXT TRIG POLARITY Syntax: Form: Description: Parameter: RST value Specified limit Example: EXT TRIG PRESCALER Syntax: Form: Description: Parameter: RST value Specified limit Example: FREQUENCY Syntax: Form: © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator.
Model 745 Digital Delay Generator.
Model 745 Digital Delay Generator. November 2013 About Telnet Ports 3 ports can be used to configure the communication link and/or the µcontroller used to communicate. • Port 4000: general communication port • Port 4001: re-initialization communication port. Used to reinitialize the communication between µC and PC. Used in case of frozen device. • Port 4002: force reset the µC. Used in case of frozen device. © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator. November 2013 Web Page control/communication The user can open a web page to control the MOD745 device via Internet Explorer, Firefox or Chrome (last versions supported). To access the web page, the IP address of the device has to be typed in the navigator address field. Once that is done, the user should access to the following page. Figure - 10.
Model 745 Digital Delay Generator. November 2013 9- ANNEX A High precision and auxiliary pulse results appear on the following figures. Figure - 12. © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator. November 2013 Figure - 13. © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator. 10- November 2013 ANNEX B Jitter (ps) The rms jitter for Internal and External source are depicted on figure 11 and 12. It is given for different delay values. 260 240 220 200 180 160 140 120 100 80 60 40 20 0 Internal External 1 100 10000 1000000 100000000 Delay (ns) Figure - 14. Internal and External delay Jitter 30 25 Jitter (ps) 20 15 Internal 10 External 5 0 1 100 10000 1000000 Delay (ns) Figure - 15. © Berkeley Nucleonics Corp.
Model 745 Digital Delay Generator. November 2013 BNC Product Information for People’s Republic of China This document provides product information as required by the People’s Republic of China Electronic Industry Standard SJ/T11364–2006, Marking for Control of Pollution Caused by Electronic Information Products.
Model 745 Digital Delay Generator. November 2013 or hazardous substances or elements contained in EIPs will not leak or mutate under the normal operating conditions described in the EIP user documentation, resulting in any environmental pollution, bodily injury, or damage to assets. Original Equipment Manufactured (OEM) EIP SJ/T11364–2006 specifies that OEM EIPs shipped by BNC should include hazardous substance information and EFUP markings.
