Model 745
DIGITAL DELAY/PULSE GENERATOR
USER MANUAL
Ver. 4.0 (Nov. 2013)
The Model 745
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
Tunable output (magnitude 2-5V, width 100ns-10µs)
50 Ω 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)
The MOD745 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.
Model 745 Digital Delay Generator.
2013February 14
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
Keypad ............................................................................................................................................. 7
BNCs ................................................................................................................................................ 7
LED indicators ................................................................................................................................. 7
4- REAR PANEL OVERVIEW ..................................................................................................... 8
Power Switch .................................................................................................................................... 8
Optional BNCs ................................................................................................................................. 8
Ethernet Port .................................................................................................................................... 8
USB Port (Option) ........................................................................................................................... 8
5- MENU STRUCTURE (NAVIGATING THE MOD745) ........................................................ 9
6- OPERATING INFORMATION ............................................................................................. 12
Operating Principles ...................................................................................................................... 12
Timing principle using external trigger ......................................................................................... 14
Timing principle using internal trigger .......................................................................................... 16
Timing principle using Burst mode ................................................................................................ 17
7- OPERATING EXAMPLE ....................................................................................................... 18
Default value .................................................................................................................................. 18
Initial setup .................................................................................................................................... 18
Setting up the instrument (Recurrent mode) .................................................................................. 18
Setting up the instrument (Single shot mode) ................................................................................. 19
Setting up the instrument (Burst Mode) ......................................................................................... 19
Stop the generator .......................................................................................................................... 19
8- PROGRAMMING .................................................................................................................... 20
Ethernet connection/communication .............................................................................................. 20
Web Page control/communication ................................................................................................. 27
9- ANNEX A .................................................................................................................................. 28
10- ANNEX B .................................................................................................................................. 30
© Berkeley Nucleonics Corp. 2 Model 745 User Manual
Model 745 Digital Delay Generator.
EDITION
Ed. Date Description
1 02/06/2011 Creation
2 06/04/2012 Modification
3 29/07/2013 Modification (new functions)
4 11/12/2013 Modification (reviewed by J.L.)
2013February 14
© Berkeley Nucleonics Corp. 3 Model 745 User Manual
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2013February 14
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 (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 rear 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
Package Contents
The box you receive should contain the following:
- MOD745 Digital Delay Generator
- CD containing the PDF user manual and Labview driver.
- Certificate of calibration
BNC product:
For more information about BNC product see our web site: http://www.berkeleynucleonics.com/.
© Berkeley Nucleonics Corp. 4 Model 745 User Manual
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November 2013
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).
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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 B
20ps RMS + delay x 10-7 (Channel
to channel) Annex B
< 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 loa d: 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 (Annex A)
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
Connector BNC
Clock Input
Frequency 10 or 80 MHz, 50% duty cycle.
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
(External trigger to any output)
Accuracy: < 1ns + delay x 10
Output (Annex A
Amplitude: 2 to 5V
Width: 100 ns to 10ms; 5ns resolution
Load: 50Ω
Rise and Fall time < 5 ns
Connector: BNC on rear panel
-C: Clock output (10MHz, +/- 1 V, square)
-G: Gate input
-O: OCXO 50ppb
November 2013
Ask factory for custom clock
frequency.
-7
-7
)
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Comment [JL1]:
November 2013
3- FRONT PANEL OVERVIEW
The Model 745 front panel is composed of several kinds of elements: the user interface which
consists of a keypad and an LCD display that allows the user to program various settings and to
interact with the device in local mode, 4 status LEDs, 5 BNC connectors.
Figure - 1. Front panel
LCD screen
A 2 line x 20 character module displays parameters for programming operations and status
information.
Keypad
A six touch keypad provides access to the configuration menu:
- ▲▼ are used to select the line/function to display. After a press on the ‘OK’ button,
up/down increments/decrements digit at the current cursor location
- ◄► are used to move the cursor position among digits
- Ok sets Sub-Menu and ‘cursor mode’, or if this mode is already set, it stores the current
value and clear the cursor mode. Transition from Menu item to Sub-Menu item.
- Esc clears the cursor mode without storing any value, gets out from the Sub-Menu item or
run/stop a channel pulse generation.
BNC Connectors
One Trigger Input and 4 independent output channels are available. The output voltage is tunable
from 2 to 5V for each output independently and each one has to be terminated in 50Ω.
The input Trigger BNC connector provides a trigger signal operating up to 50 kHz.
Status LED indicators
One status LED by output channel, each LED blinking at the output pulse frequency.
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November 2013
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.
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.
The four optional output (T5 – T8) connectors are 50Ω impedance with adjustable amplitude, delay
and width.
Ethernet Port
A RJ45 Ethernet connector is available to control the Model 745 with a computer. See Chapter 8 –
Programming for command syntax.
USB Port (Option)
A female USB connector can be available allowing computer communication with the MOD745.
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Menu n°
Displayed
name
Description
1
MOD745
Reference of the unit: name, serial number and software reference.
2
XXXX
General state
3
Gate Mode
Setting of Gate mod e
4
T0
Settings of T0 channel: trigger, output pulse amplitude and Width
5
Clock In
Input clock setting: 10 or 80MHz.
6
T1
T1 channel settings: trigger, amplitude, width, delay, reference, gate
7
T2
T2 channel settings: trigger, amplitude, width, delay, reference, gate
8
T3
T3 channel settings: trigger, amplitude, width, delay, reference, gate
9
T4
T4 channel settings: trigger, amplitude, width, delay, reference, gate
10
T5 (optional)
T5 channel settings: trigger, amplitude, width, delay, reference, gate
11
T6 (optional)
T6 channel settings: trigger, amplitude, width, delay, reference, gate
12
T7 (optional)
T7 channel settings: trigger, amplitude, width, delay, reference, gate
13
T8 (optional)
T8 channel settings: trigger, amplitude, width, delay, reference, gate
14
REF
Dealy reference summary: absolute (T0) or relative (Tx) reference
15
GATE
Gate setting summary
16
Trig Ext
External trigger settings: threshold value, polarity and prescaler value
17
Freq/Period 1
Frequency or Period of internal trigger generator 1.
18
Freq/Period2
Frequency or Period of internal trigger generator 2
19
Burst Settings
Burst mode settings
20
Trigger
Manual trigger (to launch single shot triggers: SS1, SS2, SSE or LSS
trigger source)
21
Store/Recall
To store/recall up to 4 personal MOD745 configuration
22
Status
Display trigger status of channels (‘*’ appears when the channel is
active)
Displayed
name
Description an d se t t ings
Gate Mode
To select the Gate mode
General gate: to inhibit every outputs
sub-menu)
RETURN
MENU
To return to main menu
5- MENU STRUCTURE (NAVIGATING THE MOD745)
A three level Menu is available:
• A Menu to display settings
• Sub-Menus to select parameters to set
• A Cursor-Mode to modify selected parameter
Without option
Here is given a presentation of the display menu for a standard 8 Channel Unit.
MENU
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Under item #2 we get information about the clock used by the device and device errors that could
occur such as PLL or Oscillator error.
Under item #3 we get the following sub-menu
Gate Mode SUB-MENU
Channel gate: to set i n di vid ua l behavior for each
channels (independent Gate modes set in each Tx
When items #4 (T0) and #6 to 13 (T1 to T8) are displayed, the ESC button allows the user to launch
Single Shot triggers – if selected – for the current channel.
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Displayed
name
Description an d se t t ings
TX
To select Trigger source
OFF= Trigger signal is inhibit ed
IN1= Trigger signal coming from int ernal frequency 1
IN2= Trigger signal coming from int ernal frequency 2
trigger input
TX RET=
To select the channel delay reference: T0 to T8
TX
Delay=
To adjust Output pulse delay of channel T1 to T 8 (1ps resolutio n display).
TX
Ampl=
To adjust Output pulse amplitude of channel T 1 to T8.
TX
Width=
To adjust Output pul se wi dth o f channel TX
TX Gate
To set Channel Gate mode On or Off (available if general Gate mode is set to “Channel
Gate”) of Channel T1 to T 8
RETURN
MENU
To Return to main menu
Comment [JL2]: newer image recommended
Under item #4 and #6 to #13 we get the following sub-menu:
T0-T8 SUB-MENU
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TRIG=
EXT= Trigger signal coming from the front panel (TRIG IN)
SS1= Single Shot trigger synchronous with internal freq. 1
SS2 = Single Shot trigg er synchronous with internal freq. 2
SSE= Single Shot trig g e r synchro nous with trigger inp ut
LSS = Software Single Shot trigger (launched by item #20
or ESC button when Tx di splayed)
BST = Pulse train Trigger sync. With internal freq. o r
Note: T0 doesn’t allow Delay changes.
It allows the user to configure each output pulse by selecting its amplitude, width and trigger source.
Internal and External sources cannot be set at the same time for two different channels.
Note: An output delay with 0.25ps resolution can only be configured by telnet command or via the
web page.
Trigger Output pulse
Channel N° source amplitude width delay
Figure - 3. T1 item example
With standard 4 channel unit
The item #10, 11, 12 and 13 will be skipped and will not be displayed.
Item #14 displays a summary of each channel delay reference setting (e.g. for Channel T1: T0 for
absolute reference and T2 to T8 for relative reference). The channel delay reference is set in its
specific setting menu.
Item #15 displays a summary of the channel gate state (‘1’ active and ‘0’ inactive).
Under item #16 we get the following sub-menu allowing users to configure the external trigger:
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Displayed
name
Description an d se t t ings
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 fre q ue nc y by a factor N (N = 1 to 216-1)
RETURN
MENU
To return to main menu
Displayed
name
Description an d se t t ings
Burst Trigger
To select the trigge r sourc e : 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
Displayed
name
Description an d se t t ings
Store x
To store current MOD745 configuration in conf x (x=0 to 3)
Recall x
To recall conf x MOD745 configuration
RETURN
MENU
To return to main menu
Displayed
name
Description an d se t t ings
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
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Trigger SUB-MENU
Item #17 and 18 are specific items: setting of frequency or period is available for each internal source
(use right or left arrow button to access one or the other). The period setting provides a resolution of
5ns and the frequency setting a resolution of 1Hz. By pressing the ESC button, the user can restart
internal frequencies when item 17 or 18 is displayed.
Under item #19 we get the following sub-menu
Burst Mode SUB-MENU
Under item #21 we get the following sub-menu allowing users to store/recall MOD745 parameters:
Store/Recall SUB-MENU
To refresh the channel status (item #22), a press on the OK button is needed.
IP Address SUB-MENU
The IP configuration menu can be accessed by a double press OK button on Main menu item #1.
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6- OPERATING INFORMATION
Operating Principles
The principle of the programmable delay generator is described in the figure 4 below:
November 2013
Figure - 4. 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 - 6. 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 - 8. 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 (by pressing ESC button when items #6 to 13 are
displayed or by using item #20).
Single shots synchronous to external source is depicted on Figure - 6. The same principle can be
applied to any of the internal sources.
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November 2013
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 - 9.
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 inhibited 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 inhibit simultaneously all channels,
• 1 “CHANNEL” mode to inhibit independently each channel by setting in each Tx sub-menu
the desired Gate state (‘1’ active, ‘0’ inactive).
Configuration summary
On Figure - 5 is presented a functional diagram of the device. The different operation modes are
illustrated.
Figure - 5. Functional Diagram
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November 2013
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 - 6. External Trigger Timing
In response to an input pulse the board 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 - 7. T1 Channel trigger source is set to external
trigger.
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November 2013
Figure - 7. Prescaler value
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Timing principle using internal trigger
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Figure - 8. Internal Trigger Timing
In Internal trigger mode, two tunable frequencies are available (IN1 and IN2). On Figure - 8, 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 - 8. It is obtained by setting general Gate Mode to
“CHANNEL” and T1 Gate mode to “ON”. The result is that the Gate In signal inhibits the trigger source
of the channel T1, that is to say IN1 in that case.
The width parameter doesn’t appear on these two Figures (Figure - 6, Figure - 8). 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:
𝑴𝒂𝒙𝑾𝒊𝒅𝒕𝒉 𝑻𝑿 =
𝟒𝒇
𝟏
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November 2013
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 - 9. 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.
𝒎𝒊𝒏
𝑻
𝑻𝑩𝒎𝒊𝒏 =
𝒕𝒓𝒊𝒈𝒈𝒆𝒓
𝟐 ∗ 𝑷𝒖𝒍𝒔𝒆
𝑵𝒃𝒓
So, to get a TBmin = 1000ns we have to configure the device as follows:
• T
min = Pulse nbr * 2000ns
Trigger
• Pulse nbr min = 2
• T
min = 4000ns
trigger
As depicted on Figure - 9, in the case of a generation of pulse train (Burst Mode) on a channel, the
Gate In signal can inhibit some pulses among the pulse train.
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Button operation
Display
Start at menu item #1
Up 2 times and press OK
T1
Trigger = OFF
Up 1 time
T1
Ampl 5.00 V
Press OK
T1
Ampl 5.0 0 V
Left 2 times
T1
Ampl 5.00 V
Up 1 time
T1
Ampl 4.00 V
Press OK
T1
Ampl 4.00 V
Up 1 time
T1
Width 200 ns
Press OK
T1
Width 200 ns
Left 3 times
T1
Width 200 ns
Up 1 time
T1
Width 1200 ns
Right 1 time
T1
Width 1200 ns
Down 2 times
T1
Width 1000 ns
Press OK
T1
Width 1000 ns
Up 2 times and press OK
T1
Trigger = OFF
Up 1 time
T1
Trigger = IN1
Press OK
T1
Trigger = IN1
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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, with an amplitude of 4V and a
width of 1µs. Use keys to configure the settings as following (Internal frequency 1 has been set to
1000Hz previously):
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As soon as T1 is set to IN1, the front panel LED of T1 output will be on (In fact, it will blink at the
output pulse rate, in that case at INternal frequency 1=1000Hz) indicating that there is an output
signal on T1 connector.
With an oscilloscope you can check the channel T1.
Measurement should be:
Rectangular shape with repetitive frequency =1000 Hz, Amplitude= 4.0V, Width = 1.0 µs.
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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:
o In the Trigger menu (item #16 of the general menu), by pressing the Ok button
o If item #6 to 9 are displayed, by pressing the ESC 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 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 (item# 15 in the main menu):
• Burst Trigger: IN1
• Burst Period: 100000
• Burst pulse number: 10
Once this has been done, the user has to set the width, delay and trigger source (BURST) in the T1
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 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.
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Syntax:
*IDN?
Form:
Query
Description:
Queries instrument identification. Answer gives instrument model,
serial number and firmware version.
Parameter:
-
RST value
-
Example:
BNC,MODEL 745,53901/F,V1.1
Syntax:
BTRIG Source
BTRIG? source
Form:
Set & Query
Description:
Trigger source for Burst mode: internal, external or local
Parameter:
Source: IN1, IN2, EXT, SSL
RST value
-
November 2013
8- PROGRAMMING
Ethernet connection/communication
Generality
For connection over a LAN, you have to do the following:
• Connect the instrument to the LAN physically,
• In the graphical user interface, specify the LAN address,
• On the control PC, enter the instrument’s IP address,
• After the connection has been established, the following commands can be used to modify
the settings:
o Set’s the instrument’s IP address with: IP XXX.XXX.XXX.XXX
o Query’s the instrument’s IP address with: IP? ⇒ :IP XXX.XXX.XXX.XXX
o Set’s the instrument’s IP mask with: NM XXX.XXX.XXX.XXX
o Query’s the instrument’s IP mask with: NM? ⇒ :NM XXX.XXX.XXX.XXX
o Set’s the instrument’s IP gateway: GW XXX.XXX.XXX.XXX
o Query’s the instrument’s IP gateway with: GW? ⇒ :GW XXX.XXX.XXX.XXX
Command structure
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.
*IDN?
Instrument model: MOD745
Serial number: 53901,
Channel number: F => 4 active channels (FF => 8 active channels)
Software version: 1.1
BURST TRIG
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Example:
Set external trigger source: BTRIG EXT
Syntax:
PERIOD PB, T
PERIOD? PB
Form:
Set & Query
Description:
Set Burst period
Parameter:
PB
T: period in ns (5ns resolution)
RST value
-
Specified limit
1000 ns to 1s
Example:
PERIOD PB, 1000
Syntax:
BPULSE N
BPULSE?
Form:
Set & Query
Description:
Set the number of pulses in a burst
Parameter:
N : Number of pulses
RST value
-
Specified limit
2 to 216-1 (depending on trigger source period and Burst period)
Example:
BPULSE 1000
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
Syntax:
GCHAN Tx, value
GCHAN? Tx
Form:
Set & Query
Description:
Individual channel Gate mode status
Parameter:
Tx: T1 toT 4 (or 1 to 8 for 8 channel)
Value: ON, OFF
RST value
-
Example:
Set : T1 channel mode On : GCHAN T1, ON (GENERAL GATE MODE
Query: GCHAN? T1 => :GCHAN T1, ON
Syntax:
DELAY Tx,Ti, delaytime
Query: BTRIG? => :BTRIG EXT
BURST PULSE PERIOD
PERIOD? PB=> :PER 1000
BURST PULSE NUMBER
November 2013
GENERAL GATE MODE
CHANNEL GATE MODE
RELATIVE DELAY
BPULSE? => :BPULSE 1000
has to be set to CH to activate this setting)
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DELAY? Tx
Form:
Set & Query
Description:
Delay time of channel Tx relative to channel Ti (reference channel)
is set to delaytime picosecond
Parameter:
Tn: channel number 1 to 4 (or 1 to 8 for 8 channel)
delaytime: picosecond delay
RST value
-
Specified limit
0 to 19 999 999 999 999 picoseconds
Example:
Set : program 1ns to channel 2 relative to channel 1 : DELAY T2, T1,
device, user can specify delay with 0.25ps resolution.
Syntax:
ABSDELAY? Tx
Form:
Query
Description:
Absolute delay time of channel Tx in ps
Parameter:
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
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
off
Example:
Internal mode to channel 2 : TRIG T2,IN1
Query mode to channel 2: TRIG? T2 => :TRIG T2,IN1
Syntax:
AMPL Tx, mV
AMPL? Tx
Form:
Set & Query
Description:
Tx channel voltage level setting
Parameter:
Tx: channel number 1 to 4 (or 1 to 8 for 8 channel)
mV: Volt Amplitude in milliVolt
RST value
-
Specified limit
2000 to 5 000 mV
Example:
2.5 V to channel 4: AMPL T4,2500
Query mode to channel 4: AMPL? T4 => :TRIG T4,2500
Ti: channel number 0 to 4 (or 0 to 8 for 8 channel)
Tn and Ti have to be different
1000.75
Query: DELAY? T2 => :DELAY T2, T1, 1000.75
Note : By using the Web page or Telnet command to configure the
ABSOLUTE DELAY
November 2013
TRIG
AMPLITUDE
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Syntax:
WIDTH Tx,W
WIDTH? Tx
Form:
Set & Query
Description:
Channel Tx width setting
Parameter:
Tx: channel number 1 to 4
W: width ns
RST value
-
Specified limit
Channel T0 to T4 : 100 to 10 000 ns
Channel T5 to T8 : 100 to 10 000 000ns
Example:
250 ns to channel 4: WIDTH T4,250
Query mode to channel 4: WIDTH? T4 => :WIDTH T4,250
Syntax:
STRIG mV
STRIG?
Form:
Set & Query
Description:
Set and Query trigger threshold voltage
Parameter:
mV: Threshold level in milliVolt
RST value
-
Specified limit
100 to 5 000 mV
Example:
2.5 V: STRIG 2500
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
Syntax:
TPRESC Value
TPRESC??
Form:
Set & Query
Description:
Set prescaler value to divide Trig In source frequency
Parameter:
Value: Trig In prescaler value
RST value
-
Specified limit
from 1 to 216-1
Example:
4: TPRESC 4
Syntax:
FREQ Fx, F
FREQ? Fx
Form:
Set & Query
WIDTH
EXT TRIG THRESHOLD
Query mode: STRIG? => : 2500
November 2013
EXT TRIG POLARITY
EXT TRIG PRESCALER
FREQUENCY
Query mode: POLAR? :F_E
Query mode: TPRESC? :4
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Description:
Set internal mode frequency
Parameter:
Fx : F1, F2
F: frequency Hz
RST value
-
Specified limit
1 Hz to 1 MHz
Example:
FREQ F1, 1000
FREQ? F1=> :FREQ 1000
Syntax:
PERIOD Px, T
PERIOD? Px
Form:
Set & Query
Description:
Set internal mode period
Parameter:
Px : P1, P2
T: period in ns (5ns resolution)
RST value
-
Specified limit
1000ns to 4s
Example:
PERIOD P1, 1000
PERIOD? P1=> :PER 1000
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
Syntax:
RUN
Form:
Set
Description:
Software trigger
Parameter:
-
RST value
-
Example:
RUN
Syntax:
STORE n
Form:
Set
Description:
To store MOD745 current configuration
Parameter:
n: configuration number
RST value
Specified limit
0 to 3
Example:
STORE 1
Syntax:
RECALL n
Form:
Set
Description:
To recall a MOD745 configuration previously stored
Parameter:
n: configuration number
PERIOD
CLKEXT
November 2013
RUN
STORE
RECALL
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RST value
Specified limit
0 to 3
Example:
RECALL 1
Syntax:
STAT CLEAR
STAT? xxx
Form:
Set & Query
Description:
Equipment information
Parameter:
CLK: INTERNAL / EXTERNAL
OSC: gated oscillator state
RST value
Off
Example:
STAT CLEAR : clear the information
TRIG => :STAT TRIG,1,0,0,1 Channel 1 and 4 trig on mode
STAT? OSC => gated oscillator default
Syntax:
IP x.x.x.x
IP?
Form:
Set & Query
Description:
IP Adress
Parameter:
x.x.x.x : IP address
RST value
Off
Example:
IP 172.17.23.6
IP? => :IP 172.17.23.6
Syntax:
NM x.x.x.x
NM?
Form:
Set & Query
Description:
Net mask Address
Parameter:
x.x.x.x : NW address
RST value
Off
Example:
NW 255.255.0.0
NW? => :NW 255.255.0.0
Syntax:
GW x.x.x.x
GW?
Form:
Set & Query
Description:
GW Address
Parameter:
x.x.x.x : GW address
RST value
Off
Example:
GW 172.17.23.6
STAT
TRIG: trigger channel 1 to 4 states
PLL: PLL oscillator state
STAT? CLK => :STAT CLK,INTERNAL
STAT?
internal, external or manual
STAT? PLL => PLL oscillator default,
IP address
November 2013
Net mask address
GW address
GW? => :GW 172.17.23.6
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November 2013
About Telnet Ports
3 ports can be used to configure the communication link and/or the µcontroller used to
communicate.
• Port 4000: general communication port
• Port 4001: re-initialization communication port. Used to reinitialize the communication
between µC and PC. Used in case of frozen device.
• Port 4002: force reset the µC. Used in case of frozen device.
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November 2013
Web Page control/communication
The user can open a web page to control the MOD745 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.
Figure - 10. Configuration page
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).
Status LEDs indicate which outputs are active or not and Fault LEDs warn the user in case of errors.
To refresh led status, the user has to click on one off these LEDs.
The “manual trigger button” is used to trigger a channel sets to SS1, SS2 or LSS (Single shot 1 & 2 and
Local Single Shot)
And at last, the user can access to the password setting page by typing in the address field: “Device
IP/passwd.htm”.
Figure - 11. Password page
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9- ANNEX A
High precision and auxiliary pulse results appear on the following figures.
November 2013
Figure - 12. Main pulse
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November 2013
Figure - 13. Auxiliary pulse
© Berkeley Nucleonics Corp. 29 Model 745 User Manual
Model 745 Digital Delay Generator.
November 2013
10- ANNEX B
The rms jitter for Internal and External source are depicted on figure 11 and 12. It is given for
different delay values.
260
240
220
200
180
160
140
120
Jitter (ps)
100
80
60
40
20
0
1 100 10000 1000000 100000000
Delay (ns)
Figure - 14. Internal and External delay Jitter
30
Internal
External
25
20
15
Jitter (ps)
10
5
0
1 100 10000 1000000
Delay (ns)
Figure - 15. Zoom on delay jitter
Internal
External
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Component
Toxic or Hazardous Substances and Elements
Lead
Mercury
Cadmium
Hexavalent
(Cr6+)
Polybrominated
(PBB)
Polybrominated
(PBDE)
Printed circuit
card assembly
Metal
enclosure
O: Indicates that the toxic or hazardous substance contained in all of the homogeneous materials for
materials used for this part is above the limit requirement in SJ/T 11363-2006.
November 2013
BNC Product Information for People’s Republic of
China
This document provides product information as required by the People’s Republic of China Electronic
Industry Standard SJ/T11364–2006, Marking for Control of Pollution Caused by Electronic Information
Products.
Table 1 lists toxic or hazardous substances or elements contained in Greenfield Technology electronic
information products (EIPs), including subassemblies, that exceed limits specified in SJ/T11363–2006.
Table 1. Example Toxic or Hazardous Substances and Elements Contained in Product
Name
(Pb)
this part is below the limit required in SJ/T 11363-2006.
X: Indicates that the toxic or hazardous substance contained in at least one of the homogeneous
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.
(Hg)
X O O O O O
X O O X O O
(Cd)
chromium
biphenyls
diphenylethers
This marking indicates that some homogeneous substance within the EIP contains toxic or hazardous
substances or elements above the requirements listed in SJ/T11363–2006. These substances are
identified in Table 1.
The size or function of some products may prevent them from being directly marked. These products
still meet SJ/T11364–2006 requirements, and their marking information is covered by this document.
Environmentally Friendly Use Period
The number in the marking, shown as 40 in the illustration above, refers to the EIP’s environmentally
friendly use period (EFUP). The EFUP is the number of years from the date of manufacture that toxic
© Berkeley Nucleonics Corp. 31 Model 745 User Manual
Model 745 Digital Delay Generator.
or hazardous substances or elements contained in EIPs will not leak or mutate under the normal
operating conditions described in the EIP user documentation, resulting in any environmental
pollution, bodily injury, or damage to assets.
Original Equipment Manufactured (OEM) EIP
SJ/T11364–2006 specifies that OEM EIPs shipped by BNC should include hazardous substance
information and 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. As specified in
SJ/T11364–2006, the following packaging information may be used for instances in which it is not
possible to provide recycling marks on the packaging material.
November 2013
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of the product life cycle, all products must be sent to a WEEE
recycling center.
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