BNC MOD745T User manual

MOD745T
FOUR CHANNEL DIGITAL DELAY/ PULSE GENERATOR
The MOD745T
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
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 10-7 max. which ensures a high performance
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

NUT83 Ed. 1.0
July 15
© BNC 2 MOD745T User Manual
CONTENT
1- GENERAL INFORMATION.................................................................................................... 4
What do you need to get started....................................................................................................... 5
Unpacking Caution .......................................................................................................................... 5
Operating temperature..................................................................................................................... 5
Self-test............................................................................................................................................. 5
The device software.......................................................................................................................... 5
Power fuses...................................................................................................................................... 5
RAM with battery back up................................................................................................................ 5
2- SPECIFICATIONS.................................................................................................................... 6
3- FRONT PANEL OVERVIEW.................................................................................................. 7
LCD screen ...................................................................................................................................... 7
RUN/STOP Button ........................................................................................................................... 7
BNCs ................................................................................................................................................ 7
Optional BNC................................................................................................................................... 7
4- REAR PANEL OVERVIEW..................................................................................................... 8
Power Switch.................................................................................................................................... 8
T0 output.......................................................................................................................................... 8
Optional BNCs................................................................................................................................. 8
Ethernet Port.................................................................................................................................... 8
USB Port (Option) ........................................................................................................................... 8
5- MENU STRUCTURE (NAVIGATING THE MOD745)........................................................ 9
6- OPERATING INFORMATION............................................................................................. 14
Operating Principles...................................................................................................................... 14
Timing principle using external trigger......................................................................................... 16
Timing principle using internal trigger.......................................................................................... 18
Timing principle using Burst mode................................................................................................ 19
7- OPERATING EXAMPLE....................................................................................................... 20
Default value.................................................................................................................................. 20
Initial setup .................................................................................................................................... 20
Setting up the instrument (Recurrent mode) .................................................................................. 20
Setting up the instrument (Single shot mode)................................................................................. 20
Setting up the instrument (Burst Mode) ......................................................................................... 20
Stop the generator.......................................................................................................................... 21
8- PROGRAMMING.................................................................................................................... 22
Serial communication (USB port).................................................................................................. 22
Ethernet connection/communication.............................................................................................. 22
Command structure (Ethernet and USB connection)..................................................................... 22
Web Page control/communication................................................................................................. 29
9- ANNEX A.................................................................................................................................. 30
10- ANNEX B .................................................................................................................................. 32

NUT83 Ed. 1.0
July 15
© BNC 3 MOD745T User Manual
EDITION
Ed.
Date
Description
1
07/09/2015
Creation

NUT083 083Ed. 1.0
July 15
© BNC 4 MOD745T User Manual
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. Amplitude and width are adjustable on each output channel
either programmed from the front panel or via Ethernet.
A T0 output pulse is also available. It gives a time reference for each generated delayed output.
This high accuracy and precision device is suitable for system/experiment in science or industry
that requires reliable timing solution.
The MOD745 also provides four optional delay channels to front panel T5 to T8 with also a delay
resolution of 1.25ns, trigger-to-channel jitter less than 50ps with a common 2 to 5V tunable
amplitude.
The internal timebase reference is a TCXO with a stability of 0.5ppm. An optional OCXO with a
50ppb precision can replace the standard one.
The device offers three operating trigger modes, repetitive (internal or external source), single
shot (internal, external or asynchronous source) and a burst mode (internal, external or
asynchronous source).
A Web page (accessed via Ethernet link) provides a simple method to configure the settings for
each channel, amplitude, width, trigger source, trigger mode and to control operation. You can
save and recall settings.
Instrument Options
745-4C
Standard device
745-8C
Extension to 8 channels (4 optional channels with 1.25ns resolution)
C
Clock output
G
Gate input
O
OCXO 50ppb
USB
Serial communication via USB port
Package Contents
The box you receive should contain the following:
-MOD745 Digital Delay Generator
-PDF user manual and Labview VIs can be downloaded at:
https://greenfield-technology.netexplorer.pro/
Login: MOD745
Pwd: driver_MOD745
-Certificate of calibration

NUT083 083Ed. 1.0
July 15
© BNC 5 MOD745T User Manual
BNC product:
For more information about BNC product see our web site: http://www.berkeleynucleonics.com/.
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. Notify BNC if
the device appears damaged in any way.
Caution:
Before device plug in, be sure to set the right voltage with the line voltage selector. It operates from
90V to 240 V.
Do not apply any voltage to either the shields or the output BNCs.
Operating temperature
The MOD745 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 MOD745 is cooled by air circulation.
Self-test
The unit model, firmware version, serial numbers and the result of self-test procedure will be
displayed one minute after power on. After 30s if the test is good then “self-test” disappears and the
device can be used. If the test is not ok then “self-test” stays displayed and the device is locked.
The device software
Labview Vi’s are provided with the MOD745 device. They allow users to control and/or configure the
equipment as planned. These Vis can be integrated in a top-level Vi where several devices are
controlled.
The communication is done with an Ethernet connection.
Power fuses
The MOD745 is protected against short circuit by means of one fuse according to nameplate of the
power supply (F2.5H250V).
RAM with battery back up
The MOD745 has a RAM with battery backup in which settings of the instrument can be stored
(Lithium battery ref 2032).

NUT083 083Ed. 1.0
July 15
© BNC 6 MOD745T User Manual
2- SPECIFICATIONS
Delays
Channels 4 independent delay outputs
Range 0 to 20 seconds
Resolution 0.25 ps
Jitter 25ps RMS + delay x 10-7 (external
trigger to any output) Annex
20ps RMS + delay x 10-7 (Channel
to channel) Annex
< 5ps RMS for short delay
(Channel to channel)
Accuracy < 250ps + delay x 10-7
Time base 200 MHz, 0.5 ppm
Trigger source
Internal 2 Timers tunable in Hz or ns
1Hz to 1MHz, 1Hz resolution
1µs to 4s, 5ns resolution
External Repetition rate < 1MHz
Prescaler : 1 to 216-1
Trigger level, from 0.1 to 5V,
Internal load: 50Ω
Positive or negative slope
Minimum trigger delay < 60ns
Trigger mode
Single, repetitive or burst
Burst specs. Pulse number: 2 to 216-1
Period: 1000ns to 1s
Gate Mode
2 settings: General or Individual
Gate source Active high, Rep rate <100kHz
Output T1 to T4 (A-D) BNC connector
Amplitude 2 to 5V, 0.1V resolution
Width 100ns to 10 µs, 5 ns resolution
Load 50 Ω
Rise time < 2ns max, 900ps typical
Fall time < 5ns max, 2ns typical
Clock Input
Frequency 10 or 80 MHz, 50% duty cycle.
Ask factory for custom clock
frequency.
User Memory
Up to 4 sets of MOD745 parametes can be
stored/recalled via Front Panel or Telnet
General specifications
Size 215 x 245 x 135 mm
Power 50 W –110 to 240 V
LEDs Orange: Trigger on
Software
Control panel Web page from embedded web
server for IE, Firefox or Chrome
Options
745-8C: 4-auxiliary delay output extension
Delay
Channels: 4 independent delay outputs
Range: 0 to 20 seconds
Resolution: 1.25ns
Jitter: 50ps RMS + delay x 10-7
(External trigger to any output)
Accuracy: < 1ns + delay x 10-7
Output T5 to T8 (E-H)
Amplitude: 2 to 5V
Width: 100 ns to 10ms; 5ns resolution
Load: 50Ω
Rise and Fall time < 5 ns
Connector: BNC on front panel
-C: Clock output (10MHz, +/- 1 V, square)
-G: Gate input
-O: OCXO 50ppb
-USB: Serial communication via USB port

NUT083 Ed. 1.0
July 15
© BNC 7 MOD745T User Manual
3- FRONT PANEL OVERVIEW
The Model 745 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.
Figure - 1. Front panel
LCD screen
The screen is a 4.3” touch screen.
RUN/STOP Button
Global RUN/STOP. It enables to RUN or STOP all output channels.
BNCs
One input Trigger, one Gate input and 4 independent output channels (A –D) are available. The
output voltage is tunable from 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.

NUT083 Ed. 1.0
July 15
© BNC 8 MOD745T User Manual
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.
T0 output
A reference pulse output is available. It delivers a fixed amplitude pulse with adjustable width.
Terminated in 50.
Optional BNCs
Clock input and clock output connectors are available. The CLK IN connector accepts either 10MHz or
80MHz (or custom frequency) clock frequency. The optional clock output (CLK OUT) comes from the
CLK IN connector or from the internal oscillator –if clock in signal not present.
For now, the AUX connector is not used.
Ethernet Port
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.

NUT083 Ed. 1.0
July 15
© BNC 9 MOD745T User Manual
5- MENU STRUCTURE (NAVIGATING THE MOD745)
A three level Menu is available:
A main menu to display settings
Sub-Menus to select the parameter to set
Keyboard to set the new parameter value
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 MOD745 settings by pressing the selected
parameter zone.
Figure - 3. Main Display
Main Display
Settings
name
Description
Special
Pulse Output
Channel settings: trigger, amplitude, width,
delay, reference, gate
Use the Pulse Channels bar
to change the displayed
channel
Internal
Frequencies
Frequency or Period settings of internal trigger
generator 1 & 2
Press the P button to
display period settings
General
Clock, gate, store/recall and network settings
Press General in the Setup
box to display the menu
External
trigger
Trigger settings: threshold, slope and
prescaler
Press Ext Trig in the Setup
box to display the menu
Burst
Input clock setting: 10 or 80MHz.
Press Burst in the Setup
box to display the menu
Trigger
Manual trigger button
Channel
status
Display the current channl status
Press the zone to clear
channel status

NUT083 Ed. 1.0
July 15
© BNC 10 MOD745T User Manual
Channel Setting Display
Displayed
name
Description and settings
TX
TRIG=
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. 1
SS2 = Single Shot trigger synchronous with internal freq. 2
SSE= Single Shot trigger synchronous with trigger input
LSS = Software Single Shot trigger
BST = Pulse train Trigger sync. With internal freq. or
trigger input
TX RET=
To select the channel delay reference: T0 and A to H
TX
Delay=
To adjust Output pulse delay of channel (A to D 1ps resolution display, E to H 1.25ns
resolution display).
TX
Ampl=
To adjust Output pulse amplitude of channel A to H.
TX
Width=
To adjust Output pulse width of channel TX
TX Gate
To set Channel Gate mode On or Off (available if general Gate mode is set to “Channel
Gate”) of Channel A to H
RETURN
MENU
To Return to main menu
Figure - 4. Channel settings
Note:
To escape from a submenu and go back to the main menu (RETURN MENU item in tables), the user
has to touch the bottom bar center and slide up his finger (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.
Next channel
Escape
Previous channel