BNC 750 User manual

BNC Page - 1 / 42
Model 750
MINI PULSE & DELAY GENERATOR
Key features
•Delay channel: Model 750 has 4 / 8channels
100 ps delay resolution
100 second delay range
50 MHz internal trigger rate / 40 MHz external trigger rate
•Channel output pulse
Up to 5 V, 1 ns into 50 Ω
Independent control of delay, width, polarity, burst count, and amplitude
•Trigger for every channel may be single or repetitive from these sources:
Two inputs with pre-trigger
Or three synchronous programmable timers (0.01 Hz to 50 MHz)
Or program command
•External clocking 10 MHz to 240 MHz (User programmable)
•Controlled via Internet, Ethernet and USB
User Manual
June 2021

User Manual – Model 750 June 2021
BNC Page - 2 / 42
CONTENTS
GENERAL INFORMATION....................................................................................................................................3
Presentation .........................................................................................................................................................3
Instrument Options:..............................................................................................................................................3
Installation ...........................................................................................................................................................4
Operating temperature .........................................................................................................................................4
Power On & Self-test............................................................................................................................................4
Applications..........................................................................................................................................................5
Accessories ...........................................................................................................................................................5
SPECIFICATIONS ....................................................................................................................................................6
OPERATING INFORMATION ...............................................................................................................................7
Operating Principles ............................................................................................................................................7
Example of channel outputs mode........................................................................................................................7
Output pulse into 50 Ω or high impedance example ..........................................................................................10
Delay Jitter & Accuracy Notes...........................................................................................................................11
Maximum rate and width versus Model 4C or 8C..............................................................................................12
Automatic monitoring of operating limits ..........................................................................................................13
Front and Rear panel Overview.........................................................................................................................14
GPIO interface ...................................................................................................................................................17
IP Address and default value..............................................................................................................................18
EASY control and operating example.................................................................................................................18
Remote Control ..................................................................................................................................................19
Auto RUN & Auto POWER ................................................................................................................................21
PROGRAMMING THE GENERATOR................................................................................................................22
Serial communication (USB port) ......................................................................................................................22
Ethernet connection/communication ..................................................................................................................26
Command structure (Ethernet and USB connection) .........................................................................................27
Device programming examples ..........................................................................................................................38
INDEX: ETHERNET/USB COMMAND...............................................................................................................41
EDITION
Ed.
Date
Description
1
05/2021 Creation
1.2 10/2022 Updated wording for clarity

User Manual – Model 750 June 2021
BNC Page - 3 / 42
GENERAL INFORMATION
Presentation
The Mini Pulse & Delay Generator provides up to 8 independent delayed pulses at up to
50 MHz. The model Model 750 is available in 4 channels (base version) or 8 channels as
an option. The form factor is a mini box.
Delays up to 100 seconds can be programmed with 100 ps resolution and channel-to-channel
jitter less than 50ps RMS.
SMB outputsdeliver 1.5 Vto 5V, 1ns rise time pulses, into 50 Ω. Pulse amplitude, polarity,
burst count, and width are adjustable on each output channel.
The model Model 750 offers two inputs and three (3) internal synchronized Timers
(adjustable from 0.01 Hz to 50 MHz) and one software command for triggering all
selected delay channels. Any trigger rate may be set as one-shot or repetitive. Thus, the
Model 750 with its multi-trigger system, can be considered as 4 independent generators in
a single box (see example below).
Generators
N°1
N°2
N°3
N°4
Triggered from
Trigger input
Gate / Trigger
Timer N°1
Command
Multi-generator example
The generator uses an internal 100 MHz TCXO clock reference, or an external, user
programmable (from 10 MHz to 240 MHz) clock (sine or square).
The pulse and delay generator parameters can be easily controlled remotely via Internet,
standard PC browser, or controlled remotely via USB to UART or Ethernet.
Instrument Options
Option Description
8C Extension to 8 channels

User Manual – Model 750 June 2021
BNC Page - 4 / 42
Installation
Package Contents
The box you receive should contain the following:
-Pulse & Delay Generator
-AC /DC compact power supply and power cord
-USB and Ethernet cables
-USB stick containing pdf User Manual.
-Certificate of calibration
Unpacking Caution
The Model 750 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 Berkeley Nucleonics Corporation if the device appears damaged in
any way.
Power source
The supplied power supply operates from 80 Vto 264 V AC, with a frequency range from 47
Hz to 63 Hz, and delivers avoltage of +5 VDC under 4A max.
Important: this power supply is internally earthed (outer plug connected to earth) to avoid
any hazardous potential onthe different metal parts ofthecase. Do not replace it with a
model from another reference.
To avoid any damage of the device, donot apply any voltage toeither the shield or the
outputs.
Power cord
The Model 750 comes with aremovable power cord for European or US usage. It has a
three- contact plug for connection to both the power source and protective ground.
Operating temperature
The Model 750 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 750 is cooled
by air circulation.
Power On & Self-test
After connecting the power supply, all the LEDson the front panel must be off.
•To switch ON the device, briefly press the front panel ON/OFF button (same as
RUN/STOP function), TRIG, T1 to T4 and Lock LEDs should light up briefly, TRIG to
T3 LEDs should blink for a few seconds, and then turn off. The ON/OFF button should
light yellow (STOP state).
The device is ready when the Lock LED lights green (internal system clock is locked).
•To switch OFF the device, press the ON/OFF button for more than 5 s.
All LEDs should turn off.
Auto power On: For specific applications (system, OEM…) an “auto-power On” is available
(see § Auto RUN & auto POWER).

User Manual – Model 750 June 2021
BNC Page - 5 / 42
Applications
-System Laser Timing Control
-ATE Application
-Laser Pulse Picking
-Precision Pulse Application
-Instrument Triggering
-Components Test
Application example:The Model 750 is well suited to synchronize all the devices of
aPicosecond Laser system with only one compact unit and one GUI. Inthis application
the“Clock reference input” of the pulse and delay generator receives asignal (80 MHz
for example) from the laser oscillator via an O/E (optical-to-electrical converter).
From theModel 750 Generator each amplifier (Pump-laser, Q-switch, Pockel cell...)
or diagnostic instrument (Digitizer, Calorimeter, CCD camera…) can receive repetitive or
single pulses (adjusted in rate, delay, amplitude, polarity, andwidth) synchronized on
“Clock reference input” with avery low jitter.
Picosecond Laser System
Accessories
The following modules are available to provide specific Output pulse shape.
Model
Description
GFT101
Electrical-to-optical pulse converter
GFT200
Optical-to-electrical pulse converter
GFT300
Sub-nanosecond pulse stretcher
GFT632
For more detail see on our site www.berkeleynucleonics.com
Oscillator Amplifier
N°1
Amplifier
N°2 Experiment
Diagnostics
Model 750 Generator
O/E
Clock
2 ns rise time, 15 - 70 V, 50 ns to 1 µs under 50 ΩPulse Generator
GFT614 1 to 4, up to 150 MHz 50 Ω Line driver

User Manual – Model 750 June 2021
BNC Page - 6 / 42
SPECIFICATIONS
Delay channels
Number
4 independent (up to 8 channel option)
Range
100 seconds
Resolution
100 ps
RMS jitter
< 50 ps + delay x 10-7, channel to channel
< 1 ns , external trigger to any channel
Accuracy
< 500 ps + delay x 10-6
Time base
Internal 100 MHz, ±5 ppm stability
External Trigger Mode
Input “TRIG”
Adjustable threshold from 100to 5000 mV (step of 10 mV)
Impedance = 50 Ω
Max input voltage: 50 V
Minimum pulse width: 5ns
Rate single or repetitive up to 50 MHz,
Programmable prescaler up to 1000 000 000 (step of 1)
Positive or negative slope .
Trigger delay
<85 ns (insertion delay)
Internal Trigger Mode
Rate repetitive
From three Timers with frequency = 0.01 Hz to 50 MHz (in step of 5 ns)
Rate single
From “Input trigger” or soft command
Channel Output pulse T1 to T4 (and T5 to T8)
Amplitude
1.5 V to 5 V in step of 10 mV into 50 Ω
3.0 V to 10 V in step of 20 mV into high impedance (> 1 KΩ)
Rise/Fall Time
1 ns / 1 ns into 50 Ω or 2 ns / 2 ns into high impedance @ full scale
Width
10 ns to 10 s in steps of 5 ns
Pulse Polarity
Positive or Negative
Burst Mode
From 1 to 1 000 000 000, adjustable period in step of 5 ns
MUX Mode
Any channel may be Or’ed to all outputs
Connector
SMB
External Clock reference
Threshold
0 V, internal 50 Ω
Level
Min -10 dBm, typical 6 dBm
Frequency
10 MHz to 240 MHz, user programmable in steps of 0.25 MHz up to 120
MHz (0.5 MHz from 120 MHz to 240 MHz)
Clock Output
Level
>500 mV p-p, into 50 Ω, AC coupling
Frequency
100 MHz if internal clocked or same as external clock if external clocked
Gate or second trigger
Input
Active high, adjustable threshold, positive slope, rate < 10 MHz
Function
Gate or second External Trigger
GPIO
4 x GPIO
Input or output, 0 or 3V level, SMH-103-02-D Samtec connector
General
Interface Control
USB to UART, Ethernet 10/100Mb/s
Software tools
Free Drivers for Windows 10, Linux
Power Voltage
+5 Volts, 2.5 W to 15 W according to configuration
Power supply
USB or External AC (80 - 264 V/47- 63 Hz) to DC (5 V, 4 A)
Weight
< 1 kg
Size
108 x 58.6 x 129 mm

User Manual – Model 750 June 2021
BNC Page - 7 / 42
OPERATING INFORMATION
Operating Principles
Block diagram of the generator
Time
Bas e
CLK IN CLK OUT
Trigger
Controller
4 Delay Channels
4 Delay Channels
(optional)
Channel
Outputs
T1
T2
T3
T4
T5
T6
T7
T8
Channel
Outputs
Time
Bas e
Time
Bas e
TRI GGER INPU T
Interface Controller USB / EthernetGPIO
GATE/TRIGGER
Time base:This function provides a 200 MHz time base from an internal reference or an
external 10 MHz to 240 MHz reference.
Trigger controller: This function provides 2 Trigger Modes,
-External Trigger Mode: In this mode, a rising edge on input “Trigger input” triggers all
delay channels. Every channel trigger rate can be single or repetitive or inhibited.
A Prescaler may be used to divide the Trigger Input frequency by integer value from 1 to
1 000 000 000.
-Internal Trigger Mode: In this mode, delay channels can be triggered from 3 frequency
programmable Timers. Every channel trigger rate can be single or repetitive or burst or
inhibited.
“Gate Input” quickly inhibits all or selected channel Outputs. This input function can be
selected as a second External Trigger.
The six (6) Trigger sources that are possible for each channel are presented below.
Trigger input
Gate
Timer N°1
Timer N°2
Timer N°3
Command
External mode
X
X
Internal mode
X
X
X
X
Trigger sources
Delay Channel:They are 4 independent delay channels (or 8 as an option). The delay
from the selected trigger source is programmable up to 100 seconds in 100 ps increments.
Channel Output
Each delayed output pulse T1 to T4 (and T5 to T8 as an option) is independently adjustable
in level (1.5 V to 5 V in 10 mV steps), width (10 ns to 10 s in 5 ns steps), and polarity,
and may be Or’ed to all other outputs. The outputs are designed to drive 50 Ω load. On
“high impedance” load, output level will be double the selected value.
Interface Controller: This element manages internal functions and user interface. All the
parameters can be remotely controlled via USB-to-UART and Ethernet (10/100 Mb/s). All
parameter values are automatically saved.
Four “GPIO” lines under software command allow control of other devices.
Example of channel outputs mode
Mode repetitive and single

User Manual – Model 750 June 2021
BNC Page - 8 / 42
Channel T1
(Repetitive from Timer n°1)
Channel T2
(Repetitive from Timer n°2)
Channel T3
(Single from Command)
Channel T4
(Repetitive from Timer n°3)
Mode burst and Mux
Channel T1
(Repetitive from Timer n°1)
Channel T2
(Repetitive from Timer n°1
and Burst count = 3)
Channel T3
(Repetitive from Timer n°1
and Burst count = 2)
Channel T4
(Mux = T2 + T3 )
Prescaler and gate mode
Input Trigger
Channel T1
(From Prescaler = 4 )
Gate on Channel T2
(Active High )
Channel T2
(From Prescaler = 4 and
Ga te )
Pulse picking

User Manual – Model 750 June 2021
BNC Page - 9 / 42
External clock
(80 M Hz fo r exam ple )
Channel T1
(From timer n°1 & delay = 0 )
Channel T2
(From timer n°1 & delay )
Channel T3
(From timer n°3 )
Channel T4 = Pulse picking
(Single shot from command )
Delay Delay Delay Delay

User Manual – Model 750 June 2021
BNC Page - 10 / 42
Output pulse into 50 Ω or high impedance example
(1 V/div, 20 ns/div)
Trise = 677 ps Tfall = 739 ps
Output pulse into 50 Ω load
(2 V/div, 20 ns/div)
(Trise = 1.73 ns Tfall = 1.91 ns)
Output pulse into high impedance load

User Manual – Model 750 June 2021
BNC Page - 11 / 42
Delay Jitter & Accuracy Notes
Jitter is the delay uncertainty of the channel output edge between successive triggers.
The jitter specification is valid for an observation period up to 10 seconds.
Jitter is measured in RMS picoseconds (ps).
Typical channel-to-channel jitter versus delay in ps
Delay accuracy is the difference between the programmed value and the measured
value. One channel programmed with delay = 0 is the reference of measurement.
The accuracy is the average of 1000 measurements at rate of 1 kHz.
Accuracy is measured in picoseconds.
Typical channel-to-channel delay accuracy versus delay in ps
(Red indicates max accuracy = 500 ps + delay x 10-7)
0
50
100
150
200
250
300
350
1ns 10 ns 100 ns 1 µs 10 µs 100 µS 1 ms 10 ms 100 ms
1
10
100
1000
10000
100000
1ns 10 ns 100 ns 1 µs 10 µs 100 µS 1 ms 10 ms 100 ms
Série1 Série2

User Manual – Model 750 June 2021
BNC Page - 12 / 42
Maximum rate and width versus Model 4C or 8C
Because the power consumption per bank of two channels (T1-T2 or T3-T4 or …) is
limited, there are some limitations on trigger rate and pulse width.
These limitations are automatically controlled before a RUN or each time you change a
setting during a RUN. If some settings are not allowed, then the local GUI displays a
message (see example below).
Maximum allowed with Model 4C:
•Per bank, if the Rate of one channel is > 1 MHz, then the rate of the other
channel must be ≤ 1 MHz
Note: so at most, you may have only 2 channels at 50 MHz or > 1 MHz
•Per bank, if the polarity of one channel is negative, then the polarity of the
other channel must be positive
•Per bank, if the width of one channel is >10 ms, then the width of the other
channel must be <10 ms
Note: If the amplitude of all channels is ≤ 2.5 V (TTL level) there is no rate limitation
Maximum allowed with Model 8C:
•Per bank, if the Rate of one channel is > 1 MHz, then the rate of the other
channel must be ≤ 1 MHz
•Note: so at most, you may have only 4 channels at 50 MHz or > 1 MHz
•Per bank, if the polarity of one channel is negative, then the polarity of the
other channel must be positive
•Per bank, if the width of one channel is >10 ms, then the width of the other
channel must be <10 ms
Example of configuration error

User Manual – Model 750 June 2021
BNC Page - 13 / 42
Automatic monitoring of operating limits
Maximum allowed consumption, internal temperature, and minimum power supply level
of the unit are permanently controlled by the embedded software. All three values are
displayed in the lower part of the graphical interface.
Caution: if one of these values is at allowed maximum, then the overload indicator on the
GUI turns on and the instrument automatically goes into a STOP state.
When there is an overload, try to reduce the trigger rate below 1 MHz to suppress it, and
click on the “click to clear” indicator to turn off the overload indicator.
Example of overload GUI

User Manual – Model 750 June 2021
BNC Page - 14 / 42
Front and Rear panel Overview
Front panel indicators
On the front panel, up to 7 separate LED indicators inform the user in real time if I/O or
functions are running. The description of each LED indicator is as follows:
•TRIG
Indicates that external triggered mode is active
(blinks at trigger recurrence)
•Output Channel T1 to T4
Indicates which channels are enabled (blinks at
•RUN /STOP
•Comm
•Ext ClK
•Lock
channel recurrence)
Indicates if the unit is powered,yellow when in
STOP state, green when in RUN state
Indicates that there is traffic over USB
Indicates the unit is running on External Clock
Indicates that the internal clock System is locked
Note: The RUN / STOP button is used for two functions: Power ON / OFF for the unit or
RUN / STOP the trigger system.
-A short press is needed to RUN or STOP the equipment.
-The button needs to be pressed and held for approximately 5 seconds in order to
power off the equipment.
Rear panel indicators
On the rear panel, up to 4 separate LED indicators inform the user in real time if a function
is running.
•GATE
•Over current
•USB link
•Ext DC
Indicates that input Gate is active (blinks at Gate
recurrence)
Indicates that the maximum allowed current has
been reached
Indicates that aUSB connection is established
Indicates that the Model 750 is powered by the +5
V /DC input
Notes:
-A standard USB connector provides power to the unit as well as communication.
-When powered from the USB, note that the maximum allowed current may be
limited to a lower value (500 mA) which can lead to limitations (lower output work
rate, only basic configuration supported…)
-A grounding screw is available

User Manual – Model 750 June 2021
BNC Page - 15 / 42
Model 750 FRONT &REAR panel
Front panel
Rear panel

User Manual – Model 750 June 2021
BNC Page - 16 / 42
Connectors, switch
Front panel
Rear panel
•Connector
•Connector
1
Trigger input: SMB connector
7
Gate input: SMB connector
2
T1 channel output: SMB connector
8
Clock input: SMB connector
3
T2 channel output: SMB connector
9
Clock output: SMB connector
4
T3 channel output: SMB connector
A
USB connection: micro-AB connector
5
T4 channel output: SMB connector
B
LAN connection: RJ45 connector
•Switch
C
GPIO: SHM-103 Samtec connector
6
Power ON/OFF and RUN/STOP triggers
D
+5V DC power plug: Jack 2.10 mm

User Manual – Model 750 June 2021
BNC Page - 17 / 42
GPIO interface
Four “GPIO” lines under software command are available on the rear panel. Each line can
be set as an input or an output (see command in § 4)
Specifications
Parameter
Value
Line number
4
Input low-high level
1 – 2.3 V
Input impedance
>20 kΩ
Output low – high level
0.1 – 3 V
Output impedance
100 Ω
Output rise/fall time
5 ns / 5 ns
Connector
SMH-103 Samtec
Input /Output connector
View of GPIO connector from rear panel
The pinout of the GPIO connector is:
Pin number
Description
1
Line 1
2
Line 2
3
+ 3.3 V
4
Line 3
5
Line 4
6
Ground
1
2
3
4
5
6

June 2021
BNC Page - 18 / 42
User Manual – Model 750
IP Address and default value
These values are the one stored by default (or after areset, see p. 26):
•IP: 192.168.0.10
•Gateway: 192.168.0.1
•NetMask: 255.0.0.0
•External Clock: NO
•External Clock Frequency: 100 000 000 Hz
•Clock Output: OFF
•Frequency 1: 10 000 Hz
•Frequency 2: 1000 Hz
•Frequency 3: 1 Hz
•Prescaler 1: 1
•Ext. Trigger Level 1: 1500 mV
•Ext2 Input: Gate
•Prescaler 2: 1
•Ext. Trigger Level 2: 1500 mV
•Trigger Source: OFF
•Trigger Rate: Single
•Delay: 0 ps
•Width: 100 ns
•Amplitude: 1500 mV
•Polarity: Positive
•Burst Count: 1
•Burst Period : 200 ns
•Tx Gated: NO
•Tx ‘ORed’: NO
EASY control and operating example
Initial setup
•After connecting acable from the Model 750 Ethernet port to your computer
network turn on the Model 750 with the front panel power switch.
•Change your laptop IP address (192.168.0.100) and Netmask (255.0.0.0).
•Enter the Model 750 IP address followed bytheport number
(192.168.0.10:8080) into your PC's browser.The browser will automatically open
the control panel web page on your PC (see page 19).
Setting up the instrument
The aim of the setting is to provide a repetitive pulse on output T1 with a frequency of
1 Hz, an amplitude of 5 V and a width of 1 µs.
Use your PC keypad (or mouse) to adjust the settings on your Web page.
-Set Generator F1 = 1.000
-Set Channel T1 as follows
Trigger
Source
Trigger
rate
Delay
ps
Width
ns
Amplitude
mV
Polarity
Channel T1
Generator F1
repetitive
0
1000
5000
Positive
Click “RUN” on the control panel web page to initiate pulses
On the front panel below T1, the orange indicator blinks at 1 Hz
Use an oscilloscope to check channel T1 output
Click “STOP” on the control panel web page to end pulses
The T1 indicator stops blinking

User Manual – Model 750 June 2021
BNC Page - 19 / 42
Remote Control
There are two ways to control the generator: the easy remote way via Internet or the
general remote way via Ethernet and USB software application (see Programming section
for command and examples).
Easy remote way via Internet and control panel web pages.
The web page, from the embedded Web server, provides an easy method to configure
settings.
A Main menu allows display and control of
-Trigger and clock system (trigger level, pre-scaler, clock input/output, trigger
generators)
-Delay channel (Trigger source, trigger rate, delay, amplitude/width/polarity of
channel output pulse)
-Extended delay channel settings (burst mode, gate and MUX mode)
-RUN button initiates the delay channel output pulse (similar to gate function, but
only for the outputs that are not set in the OFF state)
-Trigger button may be used to enable a single trigger (synchronized with the trigger
source) only on channels set in “single rate”. If trigger source = Manual, then the
trigger is immediately executed.
-Status Indicators indicate several critical parameters
An Extended setup allows specific adjustment of delay channel settings (burst
mode, gate and MUX mode)
A Parameters page allows you to change the IP address and configure specific
parameters
A GPIO page allows you to configure I/O lines
The configuration information (all settings) of the instrument is stored and saved in
theModel 750.
The web page can be opened via Internet Explorer, Mozilla Firefox, or Chrome.
After connecting acable from the Model 750 Ethernet port to your computer network,
enter the Model 750 IP address into your PC's browser (theIPaddress can be identified
in § IP address). The browser will automatically open the control panel web page on your
PC.
Setup of main menu (Model 4C)

User Manual – Model 750 June 2021
BNC Page - 20 / 42
Setup of main menu (Model 8C)
Extended Setup
General remote way via Ethernet or USB and software application (see programming
examples).