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BNC 745-T User 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 Ω load
T0 reference output
Clock output
Gate input
High precision internal clock (OCXO 50ppb)
USB
Ethernet interface (Web page)
Options:
4 auxiliary high resolution delay channels (1.25ns, 2 to
5V Amplitude but common tuning)
3/2/18
Berkeley Nucleonics Corporation, 2955 Kerner Blvd. San Rafael, CA 94901
Info@berkeleynucleonics.com, Call 800-234-7858 or Live-Chat @ www.berkeleynucleonics.com
MODEL 745-T
User Manual
The MODEL 745-T 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.
The MODEL 745-T
-8
max. which ensures a high performance
1 of 35

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Summary of Contents for BNC 745-T

  • Page 1 User Manual The MODEL 745-T Four high resolution delay channels 0.25ps delay resolution The MODEL 745-T digital delay generator provides four <25ps RMS jitter max (5ps for short delay) independent high resolution digital delay channels. The 20s delay range (relative/absolute reference)

  • Page 2: Table Of Contents

    Clock BNCs ............................8 AUX BNCs ............................8 Ethernet Port ............................ 8 USB Port ............................8 MENU STRUCTURE (NAVIGATING THE MODEL 745-T) ..........9 OPERATING INFORMATION ..................... 14 Operating Principles ........................14 Timing principle using external trigger ..................16 Timing principle using internal trigger ..................18 Timing principle using Burst mode ....................
  • Page 3 EDITION Date Description 07/09/2015 Creation 04/11/2015 Modification: channels T1-T8 become channels A-H 3/2/18 3 of 35 Berkeley Nucleonics Corporation, 2955 Kerner Blvd. San Rafael, CA 94901 Info@berkeleynucleonics.com, Call 800-234-7858 or Live-Chat @ www.berkeleynucleonics.com...

  • Page 4: 1- General Information

    The MODEL 745-T device provides four high precision independent delay channels. Access to these four outputs (A-D) 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). A-D can deliver up to 5V, 2ns rise time max (9-Annex A), into 50Ω.

  • Page 5: What Do You Need To Get Started

    Do not apply any voltage to either the shields or the output BNCs. Operating temperature The MODEL 745-T can be operated where the ambient air temperature is 10°C to 35°C and can be stored in ambient temperature from - 10°C to + 60°C. The MODEL 745-T is cooled by air circulation.

  • Page 6: 2- Specifications

    Communication serial, baudrate 38400 (Channel to channel) User Memory Accuracy < 250ps + delay x 10 Up to 4 sets of MODEL 745-T parameters can be Time base 200 MHz, 50 ppb stored/recalled via Front Panel or Telnet Trigger source...

  • Page 7: 3- Front Panel Overview

    ANEL VERVIEW The MODEL 745-T front panel is composed of several kinds of elements: the user interface which consists of a keyboard and an LCD display that allows the user to program various settings and to interact with the device in local mode, 4 status LEDs, BNC connectors.

  • Page 8: 4- Rear Panel Overview

    Figure - 2. Rear panel Power Switch The unit is turned on by depressing the Power button. The MODEL 745-T can be operated from 100 to 240V at a line frequency of 50-60Hz. T0 output A reference pulse output is available. It delivers a fixed amplitude pulse with adjustable width.

  • Page 9: 5- Menu Structure (Navigating The Model 745-T)

    With 8 channel option Here is given a presentation of the display menu for a 8 Channel Unit. From the main menu (Figure - 3) the user can access every MODEL 745-T settings by pressing the selected parameter zone. Figure - 3.
  • Page 10 Channel Setting Display Channel Tx can be channel A to H. Displayed Description and settings name To select Trigger source OFF= Trigger signal is inhibited TRIG= 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.
  • Page 11 Channel gate: to set individual behavior for each channels (independent Gate modes set in each Tx sub-menu) Store x To store current MODEL 745-T configuration in conf x (x=1 to 4) Recall x To recall conf x MODEL 745-T configuration RETURN...
  • Page 12 Figure - 6. General settings 1 Note: To access to the Ethernet parameters the user has to press the item on the right end of the bottom bar. Displayed Description and settings name IP ADRESS Set the instrument’s IP address NET MASK Set the instrument’s IP mask GATEWAY...
  • Page 13 External Trigger settings Displayed Description and settings name Polarity To trig on rising edge or on falling edge value of the Trig Ext input Threshold To adjust the threshold value of the Trig Ext input Prescaler To prescale the Trig Ext input frequency by a factor N (N = 1 to 2 RETURN To return to main menu MENU...

  • Page 14: 6- Operating Information

    6- O PERATING NFORMATION Operating Principles The principle of the programmable delay generator is described in the figure below: Figure - 10. Principle Trigger source can be provided by the TRIG IN input, by an internal trigger, by a software command trigger.
  • Page 15 Each channel can be independently or simultaneously “gated” by the Gate in input signal. A Gate menu is available in the main menu of the MODEL 745-T device and in each Tx sub-menu. 2 different modes can be selected in the general Gate menu: •...

  • Page 16: Timing Principle Using External Trigger

    At the end of sequence, after the last delayed pulse, the delay generator is ready for repetitive trigger mode. When a sequence is in progress, the instrument does not respond to a trigger event. The MODEL 745-T must be configured (trigger, delay, etc.) before starting any sequences. Figure - 12. External Trigger Timing In response to an input pulse the device can generate a single delayed output (single shot) or repetitive delayed output (repetitive mode with a Trig In prescaler value = 1).
  • Page 17 Figure - 13. Prescaler value 3/2/18 17 of 35 Berkeley Nucleonics Corporation, 2955 Kerner Blvd. San Rafael, CA 94901 Info@berkeleynucleonics.com, Call 800-234-7858 or Live-Chat @ www.berkeleynucleonics.com...

  • Page 18: Timing Principle Using Internal Trigger

    IN1 trigger with a specified delay of 0ps and B output uses IN2 trigger with a non-null delay. The MODEL 745-T must be configured (trigger, delay, etc.) before starting any sequences. The individual Channel Gate Mode is also depicted on Figure - 14. It is obtained by setting general Gate Mode to “CHANNEL”...

  • Page 19: Timing Principle Using Burst Mode

    If delay ���� > �������� − 15��������, the delay generation is shared between the delay register specific the MODEL 745-T manages the delay generation according to that rule: = �������� − 15��������) and the delay register associated to the burst trigger ����ℎ��������...

  • Page 20: 7- Operating Example

    7- O PERATING 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 745T with the rear panel power switch. After 30 seconds, the following information are displayed: MOD745 Sn xxxxx,4 V1...

  • Page 21: Stop The Generator

    • Burst pulse number: 10 Once this has been done, the user has to set the width, delay and trigger source (BURST) in the A channel sub-menu. The device will start to generate the requested pulse train. Stop the generator To stop the generation of that repetitive pulse, you have to set A trigger to OFF value.

  • Page 22: 8- Programming

    8- P ROGRAMMING Serial communication (USB port) Generality To access to MODEL 745-T via USB port, you have to configure the connection as follows: • Baud rate: 38400 • Data bits: 8 • Stop Bit: 1 • Parity: None •...
  • Page 23 Queries instrument identification. Answer gives instrument model, serial number and firmware version. Parameter: RST value Example: BNC,MODEL 745,53901/F,V1.1 Instrument model: MOD745 Serial number: 53901, Channel number: F => 4 active channels (FF => 8 active channels) Software version: 1.1 BURST TRIG...
  • Page 24 GENERAL GATE MODE Syntax: GGLOBAL mode GGLOBAL? Form: Set & Query Description: General Gate mode status Parameter: mode: OFF, ON and CH RST value Example: Set : inhibit all outputs : GGLOBAL ON Query: GGLOBAL? => :GGLOBAL ON CHANNEL GATE MODE Syntax: GCHAN Tx, value GCHAN? Tx...
  • Page 25 TRIG Syntax: TRIG Tx,DEC TRIG? Tx Form: Set & Query Description: Tx trigger mode selection: set trigger mode to internal, external, manual or off. Parameter: Tx: channel number 1 to 4 (or 1 to 8 for 8 channel) DEC: trigger mode : IN1, IN2, EXT, SS1, SS2, SSE, LSS, BST, OFF RST value Example: Internal mode to channel 2 : TRIG T2,IN1...
  • Page 26 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 Specified limit R_E or F_E parameters Example: Falling Edge: POLAR F_E Query mode: POLAR? :F_E EXT TRIG PRESCALER Syntax: TPRESC Value...
  • Page 27 Specified limit 0 to 3 Example: STORE 1 RECALL Syntax: RECALL n Form: Description: To recall a MODEL 745-T configuration previously stored Parameter: n: configuration number RST value Specified limit 0 to 3 Example: RECALL 1 3/2/18 27 of 35 Berkeley Nucleonics Corporation, 2955 Kerner Blvd.
  • Page 28 STAT Syntax: STAT CLEAR STAT? xxx Form: Set & Query Description: Equipment information Parameter: CLK: INTERNAL / EXTERNAL TRIG: trigger channel 1 to 4 states PLL: PLL oscillator state OSC: gated oscillator state RST value Example: STAT CLEAR : clear the information STAT? CLK =>...

  • Page 29: Web Page Control/Communication

    Web Page control/communication The user can open a web page to control the MODEL 745-T 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.

  • Page 30: 9- Annexa

    9- A NNEX High precision and auxiliary pulse results appear on the following figures. Figure - 18. Main pulse (channels A to D) 3/2/18 30 of 35 Berkeley Nucleonics Corporation, 2955 Kerner Blvd. San Rafael, CA 94901 Info@berkeleynucleonics.com, Call 800-234-7858 or Live-Chat @ www.berkeleynucleonics.com...
  • Page 31 Figure - 19. Auxiliary pulse (channels E to H) 3/2/18 31 of 35 Berkeley Nucleonics Corporation, 2955 Kerner Blvd. San Rafael, CA 94901 Info@berkeleynucleonics.com, Call 800-234-7858 or Live-Chat @ www.berkeleynucleonics.com...

  • Page 32: 10- Annexb

    NNEX 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)
  • 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.
  • Page 35 NOTES 3/2/18 35 of 35 Berkeley Nucleonics Corporation, 2955 Kerner Blvd. San Rafael, CA 94901 Info@berkeleynucleonics.com, Call 800-234-7858 or Live-Chat @ www.berkeleynucleonics.com...

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