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

NUT083 Ed. 1.0
July 15
© BNC 11 MOD745T User Manual
Internal Frequency Display
Displayed
name
Description and settings
Frequency 1
Frequency of internal trigger generator 1.
Frequency 2
Frequency of internal trigger generator 2.
Period 1
Period of internal trigger generator 1.
Period 2
Period of internal trigger generator 2.
RETURN
MENU
To return to main menu
Figure - 5. Frequency settings
Note:
Changing a frequency setting will change automatically the associated period setting and conversely.
General settings
Displayed
name
Description and settings
Ext Clock
Input clock setting: 10 or 80MHz.
Gate Mode
To select the Gate mode
General gate: to aim every outputs
Channel gate: to set individual behavior for each
channels (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
MENU
To return to main menu

NUT083 Ed. 1.0
July 15
© BNC 12 MOD745T User Manual
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
name
Description and settings
IP ADRESS
Set the instrument’s IP address
NET MASK
Set the instrument’s IP mask
GATEWAY
ADRESS
Set the instrument’s IP gateway
USE DHCP
YES (automatic IP address assignment) or NO (for manual IP assignment)
LANGUAGE
Select French or English language for menu
RETURN
MENU
To Return to main menu
Figure - 7. General settings 2 - Network

NUT083 Ed. 1.0
July 15
© BNC 13 MOD745T User Manual
External Trigger settings
Displayed
name
Description and settings
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 216-1)
RETURN
MENU
To return to main menu
Figure - 8. External trigger settings
Burst Mode Settings
Displayed
name
Description and settings
Burst Trigger
To select the trigger source : Int, Ext or manual
Pulse Number
To select the pulse number in each burst to generate (from 2 to 216-1)
Pulse Period
To select the period between burst pulses (from 1000ns to 1s)
RETURN
MENU
To return to main menu
Figure - 9. Burst mode settings

NUT083 Ed. 1.0
July 15
© BNC 14 MOD745T User Manual
6- OPERATING INFORMATION
Operating Principles
The principle of the programmable delay generator is described in the figure 4 below:
Figure - 10. 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.
Repetitive triggers
When the external trigger source is selected a rising edge on “TRIG IN” starts a delay sequence. The
sequence is depicted on Figure - 12. It has to be noticed that a Prescaler value can be used to divide
the Trig Ext input signal frequency.
To get this feature, the user has to select ‘EXT’ as trigger source on the device via the front panel or
via remote control (web page, Ethernet link).
If the internal trigger source is selected, the user can specify the needed trigger source via the front
panel or via remote control (web page, Ethernet link). 2 frequency generators derived from input
clock can be used as repetitive triggers: IN1 and IN2 corresponding to programmable Frequency 1
and 2. The use of internal trigger is depicted on Figure - 14. Frequency generation restarts when a
push on the ESC button is detected while Frequency/Period menu is displayed.
Note: The internal period P1 et P2 can only be increment by step of 5ns.
Single Shot triggers
3 single shot modes are available: one synchronous to the external source (SSE), one to an internal
source (SS1 synchronous to Frequency 1, SS2 synchronous to Frequency 2) and the last, an
asynchronous one (LSS).
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.

NUT083 Ed. 1.0
July 15
© BNC 15 MOD745T User Manual
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 - 15.
To generate a burst on a specified channel, first, the user has to configure the Burst mode itself
(trigger, pulse number and pulse period) and then select “Burst (BST)” in the trigger source selection
of the concerned channel.
Output channels
A T0 output pulse is the time reference of the delay output. It is generated for each selected trigger.
Each output delayed pulse values T1 to T4 can be independently tuned in level, absolute or relative
delay and width. All values (delay, delay reference, level, width, gate) are saved in memory except
the trigger source.
Each output delayed pulse values (T5 to T8) can be independently tuned in absolute or relative delay
and width. All values (delay, delay reference, width) are saved in memory except the trigger source.
Calibration parameters are saved onboard.
After the power on, all trigger sources are off.
It has to be noticed that several output channels can only be triggered by the same source, that is to
say an internal OR external source.
Gate mode
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 MOD745 device and in each Tx sub-menu. 2 different
modes can be selected in the general Gate menu:
1 “GENERAL” mode to gate simultaneously all channels,
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

NUT083 Ed. 1.0
July 15
© BNC 16 MOD745T User Manual
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).
The sequence includes two external trigger phases:
After an insertion delay (<60ns), a pulse appears on each channel after a specified delay
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 MOD745 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). 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.

NUT083 Ed. 1.0
July 15
© BNC 17 MOD745T User Manual
Figure - 13. Prescaler value

NUT083 Ed. 1.0
July 15
© BNC 18 MOD745T User Manual
Timing principle using internal trigger
Figure - 14. Internal Trigger Timing
In Internal trigger mode, two tunable frequencies are available (IN1 and IN2). On Figure - 14, 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 - 14. It is obtained by setting general Gate Mode to
“CHANNEL” and T1 Gate mode to “ON”. The result is that the Gate In signal allows the pulse output
of the channel T1.
The width parameter doesn’t appear on these two Figures (Figure - 12, Figure - 14). It has to be
noticed that the frequency fused as repetitive input trigger (internal or external) and the maximum
width of a corresponding output channel TX are linked by:
 


NUT083 Ed. 1.0
July 15
© BNC 19 MOD745T User Manual
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 - 15. 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.
   

So, to get a TBmin = 1000ns we can configure the device as follows:
Pulse nbr max = 5
Ttrigger min = 5000ns
As depicted on Figure - 15, in the case of a generation of pulse train (Burst Mode) on a channel, the
Gate In signal can allow some pulses among the pulse train.
It has to be noticed that when a delay D is specified on a channel using Burst mode as trigger mode,
the MOD745 manages the delay generation according to that rule:
-If delay    , the delay generation is shared between the delay register specific
to the channel (  ) and the delay register associated to the burst trigger
generation (     ).
-If delay    , the delay generation is managed as usual, that is to say by using the
selected channel delay register.
To summarize:       when    .
When several channels are using Burst mode as trigger mode and one of the delay specified leads to
the  register use (   ), the value will be ignored (each channel will be delayed
by ).

NUT083 Ed. 1.0
July 15
© BNC 20 MOD745T User Manual
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.
After 30 seconds, the following information are displayed:
MOD745 Sn xxxxx,4 V1
SELF TEST
Setting up the instrument (Recurrent mode)
The aim is to set a repetitive frequency of 1000Hz to output pulse T1 (A), with an amplitude of 4V
and a width of 1µs. Use the touch screen to configure the settings as following:
-Go to the internal frequency display
-Set Freq 1 to 1000Hz and return to the main menu
-Go the channel setting display and select channel T1 (or A)
-Set amplitude to 4V and width to 1µs
-Select IN1 as trigger source.
As soon as T1 (A) is set to IN1, the main display LED of T1 (A) will be on indicating that there is an
output signal on T1 (A) connector.
With an oscilloscope you can check the channel T1 (A).
Measurement should be:
Rectangular shape with repetitive frequency =1000 Hz, Amplitude= 4.0V, Width = 1.0 µs.
Setting up the instrument (Single shot mode)
The procedure explained before can be followed up to the trigger choice. 3 single shot modes
(external: SSEXT, internal: SS1 and SS2, asynchronous: LSS) can be set. Once the single shot trigger
mode is set, the user has to send a software command to trigger the single shot output pulse. To
send this software command, 3 ways are available:
Via the front panel: in the general menu, by pressing the TRIG button
Via a telnet command, by sending the ‘RUN’ command to the device
Via the web page, by pressing the ‘manual trigger’ button in the Trigger menu
Setting up the instrument (Burst Mode)
The aim is to set channel T1 (A) in Burst mode to get:
a 5V, 200ns width, 0ns delay pulse
100Hz IN1 trigger source
Burst period 100000ns, pulse number = 10
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