BNC MOD745T Manual

Four channel digital delay/ pulse generator

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FOUR CHANNEL DIGITAL DELAY/ PULSE GENERATOR
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
External trigger prescaler (pulse picking)
Tunable output (magnitude 2-5V, width 100ns-10µs)
50  load
T0 reference output
Ethernet interface (Web page)
Options:
4 auxiliary high resolution delay channels (1.25ns, 2 to
5V Amplitude but common tuning)
Clock output
Gate input
High precision internal clock (OCXO 50ppb)
USB
MOD745T
The MOD745T digital delay generator provides four
independent high resolution digital delay channels. The
rms jitter between the trigger and any outputs is 25ps +
delay x 10
delay. The device can be triggered by different ways:
External trigger via a BNC input, Internal trigger and
Software command trigger, each one with repetitive,
single and burst trigger modes.
NUT 083 . Ed. 1.0
07/2014
USER MANUAL
The MOD745T
-7
max. which ensures a high performance

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Summary of Contents for BNC MOD745T

  • Page 1 Three trigger sources: external, internal or command delay. The device can be triggered by different ways: Positive or Negative trigger slope External trigger via a BNC input, Internal trigger and Single, Repetitive or Burst trigger mode Software command trigger, each one with repetitive, Gate mode single and burst trigger modes.
  • Page 2: Table Of Contents

    SPECIFICATIONS ........................6 FRONT PANEL OVERVIEW ....................7 LCD screen ............................7 RUN/STOP Button ........................... 7 BNCs ..............................7 Optional BNC ........................... 7 REAR PANEL OVERVIEW ..................... 8 Power Switch ............................ 8 T0 output ............................8 Optional BNCs ..........................8 Ethernet Port ............................
  • Page 3 NUT83 Ed. 1.0 July 15 EDITION Date Description 07/09/2015 Creation © BNC MOD745T User Manual...
  • Page 4: 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 (9-Annex A), into 50Ω.
  • Page 5: What Do You Need To Get Started

    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. Notify BNC if the device appears damaged in any way.
  • Page 6: 2- Specifications

    General or Individual Connector: BNC on front panel Gate source Active high, Rep rate <100kHz -C: Clock output (10MHz, +/- 1 V, square) Output T1 to T4 (A-D) BNC connector -G: Gate input Amplitude 2 to 5V, 0.1V resolution -O: OCXO 50ppb Width 100ns to 10 µs, 5 ns resolution...
  • Page 7: 3- Front Panel Overview

    2 to 5V for each output independently and each one has to be terminated in 50. The input Trigger BNC connector provides a trigger signal operating up to 50 kHz. Optional BNC The four optional output (E – H) connectors are 50impedance with adjustable amplitude, delay and width.
  • Page 8: 4- Rear Panel Overview

    A RJ45 Ethernet connector is available to control the Model 745 with a computer. See § 8-. USB Port (Option) A female USB connector can be available allowing serial communication with the MOD745. See Chapter 8 – Programming for command syntax. © BNC MOD745T User Manual...
  • Page 9: 5- Menu Structure (Navigating The Mod745)

    Burst Input clock setting: 10 or 80MHz. Press Burst in the Setup box to display the menu Trigger Manual trigger button Channel Display the current channl status Press the zone to clear status channel status © BNC MOD745T User Manual...
  • Page 10 (see Figure - 4). To generate a pulse with a Single Shot setting (SS1, SS2, SSE or LSS), the user has to press the TRIG button displayed on the general menu. © BNC MOD745T User Manual...
  • Page 11 (independent Gate modes set in each Tx sub-menu) Store x To store current MOD745 configuration in conf x (x=1 to 4) Recall x To recall conf x MOD745 configuration RETURN To return to main menu MENU © BNC MOD745T User Manual...
  • Page 12 USE DHCP YES (automatic IP address assignment) or NO (for manual IP assignment) LANGUAGE Select French or English language for menu RETURN To Return to main menu MENU Figure - 7. General settings 2 - Network © BNC MOD745T User Manual...
  • Page 13 To select the pulse number in each burst to generate (from 2 to 2 Pulse Period To select the period between burst pulses (from 1000ns to 1s) RETURN To return to main menu MENU Figure - 9. Burst mode settings © BNC MOD745T User Manual...
  • Page 14: 6- Operating Information

    Each single shot mode is triggered by a software command. Software trigger command is available either via remote control or via front panel. Single shots synchronous to external source is depicted on Figure - 12. The same principle can be applied to any of the internal sources. © BNC MOD745T User Manual...
  • Page 15 1 “CHANNEL” mode to gate independently each channel by setting in each Tx sub-menu the desired Gate state (‘1’ active, ‘0’ inactive). Configuration summary On Figure - 11 is presented a functional diagram of the device. The different operation modes are illustrated. Figure - 11. Functional Diagram © BNC MOD745T User Manual...
  • Page 16: Timing Principle Using External Trigger

    (repetitive mode with a Trig In prescaler value = 1). As explain before, the single shot pulse is conditioned by the soft trigger command. The use of the Prescaler value is depicted on Figure - 13. T1 Channel trigger source is set to external trigger. © BNC MOD745T User Manual...
  • Page 17 NUT083 Ed. 1.0 July 15 Figure - 13. Prescaler value © BNC MOD745T User Manual...
  • Page 18: Timing Principle Using Internal Trigger

    The width parameter doesn’t appear on these two Figures (Figure - 12, Figure - 14). It has to be noticed that the frequency f used as repetitive input trigger (internal or external) and the maximum width of a corresponding output channel TX are linked by: ��������������ℎ ���� = 4�� © BNC MOD745T User Manual...
  • Page 19: Timing Principle Using Burst Mode

    When several channels are using Burst mode as trigger mode and one of the delay specified leads to the �� register use (�� > ���� − 15����), the �� value will be ignored (each channel will be delayed ������ ������ by �� ������ © BNC MOD745T User Manual...
  • Page 20: 7- Operating Example

    First the user has to configure the F1 frequency to 100 Hz and then the Burst Mode itself. That is to say, set in the Burst Mode menu:  Burst Trigger: IN1  Burst Period: 100000 © BNC MOD745T User Manual...
  • Page 21: Stop The Generator

    To stop the generation of that repetitive pulse, you have to set T1 trigger to OFF value. This will switch off the corresponding LED. With an oscilloscope you can check if the output signal is switch off. © BNC MOD745T User Manual...
  • Page 22: 8- Programming

    Each command description is composed at least of some of the following items (all commands are used in a telnet prompt):  Full command syntax,  Form Set / Query,  Brief description,  Parameters,  RST value,  Specified limits.  Example. © BNC MOD745T User Manual...
  • Page 23 N : Number of pulses RST value Specified limit 2 to 2 -1 (depending on trigger source period and Burst period) Example: BPULSE 1000 BPULSE? => :BPULSE 1000 GENERAL GATE MODE Syntax: GGLOBAL mode GGLOBAL? © BNC MOD745T User Manual...
  • Page 24 Tx: channel number 1 to 4 (or 1 to 8 for 8 channel) RST value Specified limit Example: Query: ABSDELAY? T2 => :DELAY T2, 5000.75 TRIG Syntax: TRIG Tx,DEC TRIG? Tx Form: Set & Query © BNC MOD745T User Manual...
  • Page 25 2.5 V: STRIG 2500 Query mode: STRIG? => : 2500 EXT TRIG POLARITY Syntax: POLAR Edge POLAR? Form: Set & Query Description: Edge: Rising Edge or Falling Edge Parameter: Edge: R_E or F_E RST value © BNC MOD745T User Manual...
  • Page 26 PERIOD? P1=> :PER 1000 CLKEXT Syntax: CLKEXT F CLKEXT? F Form: Set & Query Description: Set external PLL frequency Parameter: F: external PLL frequency: CLK10, CLK80 RST value Specified limit Example: CLKEXT CLK10 CLKEXT? => :CLKEXT: CLK10 © BNC MOD745T User Manual...
  • Page 27 STAT? PLL => PLL oscillator default, STAT? OSC => gated oscillator default IP address Syntax: IP x.x.x.x Form: Set & Query Description: IP Adress Parameter: x.x.x.x : IP address RST value Example: IP 172.17.23.6 IP? => :IP 172.17.23.6 © BNC MOD745T User Manual...
  • Page 28 RST value Example: NW 255.255.0.0 NW? => :NW 255.255.0.0 GW address Syntax: GW x.x.x.x Form: Set & Query Description: GW Address Parameter: x.x.x.x : GW address RST value Example: GW 172.17.23.6 GW? => :GW 172.17.23.6 © BNC MOD745T User Manual...
  • Page 29: Web Page Control/Communication

    From that page, the user can configure each output pulse (amplitude, width, trigger, delay, inhibit and delay reference), trigger settings, internal frequencies, external clock and burst mode. On the first setting change, the user will be asked for Login and Password (Default Login: BNC, Default password:bnc).
  • Page 30: 9- Annexa

    NUT083 Ed. 1.0 July 15 9- A NNEX High precision and auxiliary pulse results appear on the following figures. Figure - 18. Main pulse © BNC MOD745T User Manual...
  • Page 31 NUT083 Ed. 1.0 July 15 Figure - 19. Auxiliary pulse © BNC MOD745T User Manual...
  • Page 32: 10- Annexb

    The rms jitter for Internal and External source are depicted on figure 11 and 12. It is given for different delay values. Internal External 10000 1000000 100000000 Delay (ns) Figure - 20. Internal and External delay Jitter Internal External 10000 1000000 Delay (ns) Figure - 21. Zoom on delay jitter © BNC MOD745T User Manual...
  • Page 33 SJ/T 11363-2006. Product Marking Explanations In accordance with the requirements specified in SJ/T 11324-2006, all BNC EIPs sold in the People's Republic of China are marked with pollution control marking. The following marking applies to BNC products.
  • Page 34 EFUP markings. Table 1 applies to products that do not supply OEM product information Manufacture Date Manufacture dates of all BNC products are encoded into the product serial number. Contact your local sales office to obtain the manufacture date for your product. Packaging Recycling Marks EIP packaging is marked in accordance with the needs and requirements for recycling, reuse, and regeneration, as defined in standard GB 18455–2001, Packaging Recycling Marks.

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