BNC 745-20C User manual

•20 independent delay channels
•100 ps delay resolution (1 ps option)
•10 seconds delay range
•Adjustable output level, polarity and width
Number of pages: 31
NUT 063 Ed. 2.2
September 2015
User's Manual
MODEL 745-20C
20 CHANNELS DIGITAL DELAY GENERATOR

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 2 / 31
TABLE OF CONTENTS
EDITION ...........................................................................................................................................................................4
1. GENERAL INFORMATION ..................................................................................................................................5
1.1. OVERVIEW...........................................................................................................................................................5
1.2. PRINCIPLE –BLOCK DIAGRAM .............................................................................................................................6
2. SPECIFICATIONS...................................................................................................................................................7
3. INSTALLATION......................................................................................................................................................9
3.1.1. Power source...............................................................................................................................................9
3.1.2. Power cord..................................................................................................................................................9
3.2. OPERATING TEMPERATURE..................................................................................................................................9
3.3. RACK MOUNTING INFORMATION ..........................................................................................................................9
3.4. SELF-TEST............................................................................................................................................................9
3.5. OPTIMAL PERFORMANCE......................................................................................................................................9
4. INTERFACES DESCRIPTION............................................................................................................................10
4.1. FRONT PANEL.....................................................................................................................................................10
4.1.1. Local interface ..........................................................................................................................................10
4.1.2. AUX 1 to 3.................................................................................................................................................10
4.2. REAR PANEL.......................................................................................................................................................10
4.2.1. Power switch.............................................................................................................................................11
4.2.2. Ethernet port (LAN) ..................................................................................................................................11
4.2.3. Trigger input (TRIG IN)............................................................................................................................11
4.2.4. Trigger ouptut (T0) ...................................................................................................................................11
4.2.5. Clock output (CLK OUT)..........................................................................................................................11
4.2.6. Clock input (CLK IN)................................................................................................................................11
4.2.7. Delayed output (T1 to T20).......................................................................................................................11
5. LOCAL OPERATION ...........................................................................................................................................12
5.1. MAIN MENU .......................................................................................................................................................12
5.2. SUB-MENU “PULSE SETUP OUTPUT” ...........................................................................................................13
5.1. SUB-MENU “DELAY”..........................................................................................................................................15
5.2. SUB-MENU “AMPLITUDE”..................................................................................................................................15
5.3. SUB-MENU “WIDTH”..........................................................................................................................................16
5.4. SUB-MENU “INTERNAL FREQUENCIES SETUP” ........................................................................................16
5.5. SUB-MENU “FREQUENCY” .................................................................................................................................17
5.6. SUB-MENU “NETWORK ADDRESS SETUP” .................................................................................................17
5.7. SUB-MENU “IP ADDRESS”..................................................................................................................................18
5.8. FRONT PANEL “RUN/STOP”BUTTON ..................................................................................................................18
6. REMOTE CONTROL............................................................................................................................................19
6.1. CONNECTION .....................................................................................................................................................19
6.2. COMMAND STRUCTURE......................................................................................................................................19
6.2.1. IDENTIFICATION....................................................................................................................................20
6.2.2. DELAY ......................................................................................................................................................20
6.2.3. TRIGGER..................................................................................................................................................21
6.2.4. VOLTAGE LEVEL ....................................................................................................................................21
6.2.5. WIDTH......................................................................................................................................................22
6.2.6. POLARITY ................................................................................................................................................22
6.2.7. FREQUENCIES........................................................................................................................................23
6.2.8. RUN...........................................................................................................................................................23
6.2.9. ARM ..........................................................................................................................................................24
6.2.10. STAT..........................................................................................................................................................25

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 3 / 31
6.2.11. IP adress ...................................................................................................................................................26
6.2.12. Netmask adress..........................................................................................................................................26
6.2.13. Gateway adress.........................................................................................................................................27
6.3. REMOTE CONTROL VIA WEB PAGE......................................................................................................................28
7. SOFTWARE............................................................................................................................................................30

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 4 / 31
Edition
Written by :
D. MONNIER-BOURDIN
Technical manager
Date & Visa :
Edition Date Description
1 January 2014 Creation
2 October 2014 Operating description updates
2.1 April 2015
Minor correction
2.2 September 2015
Add some informations
2.3 August 2016
Correct some mistake

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 5 / 31
1. GENERAL INFORMATION
1.1. Overview
The MODEL 745-20C Digital Delay Generator provides twenty independent delayed output pulses.
Delays up to 10 seconds may be programmed with 100ps resolution (1ps optional) and a channel to
channel jitter of less than 50 ps RMS.
BNC outputs deliver delayed pulses with adjustable level (3 to 6V) and width into 50Ωload. A polarity
control allows to have inverted pulses.
A trigger output signal (T0) is provided as the temporal reference for the delayed outputs.
The MODEL 745-20C may be remote controlled via Ethernet interface (10/100Mb/s) (basic commands or
Web page interface).
Instrument Options
Option 1 Clock output
Option 2 2.5 to 10 V channels, 1 ns rise time, positive polarity
Option 3 Amplitude up to 20 V, adjustable
Option 4 Maximum amplitude up to 32V (fixed)
Option 5 1 ps resolution
Option 6 Front panel for local control (touchscreen)
Other Trigger source saved after shut down, Immediate modification of outp
ut pulse without
validation, specific options available upon request.
Package contents
The box you receive should contain the following:
oMODEL 745-20C instrument,
oPower cable,
oUser’s manual,
oCD containing DLL and Labview driver.
Berkeley Nucleonics products
For more information about Berkeley Nucleonics products see our web site:
www.BerkeleyNucleonics.com

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 6 / 31
1.2. Principle – Block diagram
The principle of the MODEL 745-20C programmable delay generator is described in the figure bellow.
The sequence follows 3 phases:
1) After an insertion delay, a reference pulse appear at the “T0” output,
2) Following the reference, a pulse is generated on each channel after the specified delay,
3) At the end of the sequence, after last delayed pulse outputs, the delay generators are initiate.
When a sequence is in progress the instrument will not respond to a trigger event.
Each channel T1 to T20 can be independently set in level, width, delay, polarity and trigger source. All
these values are saving when the equipment is shut down, except the trigger source (option). After the power
on, all trigger sources are set to OFF (INH).

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 7 / 31
2. SPECIFICATIONS
Delays
Channels 20 independent delay channels
Range 0 to 10 seconds
Resolution 100 ps (1 ps option)
RMS Jitter < 25 ps + delay x 10-7 rms
Internal time base
Frequency CLK RF
Stability 10-8
Trigger
Single shot source SS1 and
SS2 SS1 synchronous with the first occurrence of F3 and SS2 with the second occurrence of F3.
Synchronous repetitive
triggers 3 frequencies: F1> F2 > F3 in 1, 2 , 5 sequence
F1: 1000, 500, 200, 100, 50, 20, 10, 5, 2 Hz
F2: 200, 100, 50, 20, 10, 5, 2, 1, 0.5 Hz
F3: 50, 20, 10, 5, 2, 1, 0.5, 0.2, 0.1 Hz
Outputs
Delayed output (T1 to T20)
Positive or negative pulse into 50 Ω,
Amplitude 3 to 6 V , resolution: 10 mV,
Rise time : < 5 ns,
Fall time: < 10 ns,
Width: 100 ns to 300 ms
Connector type BNC,
Reference output (T0) Positive pulse into 50 Ω, amplitude 3 to 6V, resolution 10 mV
Rise time < 5 ns, fall time < 10 ns, width 100ns to 300 ms
Connector type BNC
CLK RF / 2 (output option) Frequency: CLK RF / 2, > 1V / 50 Ω, Connector type BNC
Interface
Front panel (option), Ethernet 10/100 Mb/s, Internet (Web page)
General
Power Required 90 – 220 V / 50 – 60 Hz / 1 A.
Weight Net: < 10 kg
Dimensions 19’’, 2 U, 320 mm without handles
Level: 3 to 6 V
Width :
100 ns to 300 ms
Tm :
< 3 ns

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 8 / 31
Outputs (option 2)
Delayed output (T1 to T20)
Positive pulse into 50 Ω,
Amplitude 2.5 to 10 V , resolution: 10 mV,
Rise time : < 1 ns,
Fall time: < 5 ns,
Width: 100 ns to 10 ms
Connector type BNC,
Outputs (option 3)
Delayed output (T1 to T20)
Positive pulse into 50 Ω,
Amplitude 5 to 20 V , resolution: 10 mV,
Rise time : < 5 ns,
Fall time: < 10 ns,
Width: 100 ns to 1 µs
Connector type BNC,
Outputs (option 4)
Delayed output (T1 to T20)
Positive pulse into 50 Ω,
Amplitude 32 V ,
Rise time : < 10 ns,
Fall time: < 10 ns,
Width: 100 ns to 1 µs
Connector type BNC,

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 9 / 31
3. INSTALLATION
3.1.1. Power source
The MODEL 745-20C can be operated from 90 VAC to 240 VAC nominal supply source.
The maximum power consumption of the MODEL 745-20C is 80 W.
3.1.2. Power cord
The MODEL 745-20C comes with a removable power cord for US operation. It has a three contact plug
for connection to both the power source and protective ground.
3.2. Operating temperature
The MODEL 745-20C can be operated where the ambient air temperature is 0°C to 35°C and can be
stored in ambient temperature from - 10°C to + 60°C. The MODEL 745-20C is cooled by air circulation. To
prevent instrument damage a clearance of 2 inches on the side and 1 inch on the rear must be maintained
for proper cooling.
3.3. Rack mounting information
The MODEL 745-20C will fit a 19 inch rack.
3.4. Self-test
The model, firmware version, serial numbers of the equipment and self-test will be displayed for a certain
duration after the start up, depending on the ambient temperature. The self-test should not exceed 1 minute.
3.5. Optimal performance
To ensure optimal performance, it is recommended to wait 1 hour after the equipment’s switching on.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 10 / 31
4. INTERFACES DESCRIPTION
4.1. Front panel
The MODEL 745-20C front panel is depicted in the following figure.
4.1.1. Local interface
The MODEL 745-20C is equipped with a touch screen (option) on the front panel for local operation.
4.1.2. AUX 1 to 3
The three BNC connectors located on the front panel are used for extension to 40 channels. They are
unused in the MODEL 745-20C version.
4.2. Rear panel
All input/output connections on the MODEL 745-20C are located on the rear panel depicted in the
following figure.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 11 / 31
4.2.1. Power switch
The unit is turned ON by switching the red button located above the mains connector.
The MODEL 745-20C can be operated from 90 to 240 V at a line frequency of 50 – 60 Hz.
4.2.2. Ethernet port (LAN)
The “LAN” RJ45 rear panel connector is used to remote control the MODEL 745-20C with TCP/IP
protocol.
4.2.3. Trigger input (TRIG IN)
The “TRIG IN” BNC connector is used for application of the trigger input signal that generates the single
shot sequence.
4.2.4. Trigger ouptut (T0)
The “T0” BNC connector is used as the output temporal reference for delayed outputs. This should be
terminated in 50Ωif used.
4.2.5. Clock output (CLK OUT)
The “CLK OUT” BNC connector (option) is used to monitor the internal frequency reference divided by 2.
This signal is synchronous with the other outputs. This should be terminated in 50 Ωif used.
4.2.6. Clock input (CLK IN)
The “CLK IN” BNC connector is used to add an external frequency reference.
4.2.7. Delayed output (T1 to T20)
“T1” to “T20” BNC connectors are the 20 delayed outputs. They should be terminated in 50 Ωif used.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 12 / 31
5. LOCAL OPERATION
5.1. Main menu
After power on, the main menu appears on the touch screen as depicted below.
PULSE OUTPUT displays
the settings of
each channel T0 to T20.
INTERNAL FREQUENCIES displays the
actual set of frequencies F1, F2 and F3.
STATUS displays the status
of the
equipment (internal or external clock and
status).
1to 20 indicators light up in green when the
corresponding channel has been triggered.
TRIG runs a unique single shot sequence.
Notes:
-The displayed channel in PULSE OUTPUT window is set with the scroll bar at the bottom of the
screen.
-The STATUS OK indicator turns red when the equipment is in a default state.
-The 1 to 20 trigger status indicators turn green if the channel has delivered at least one pulse.
-Tapping on the 1 to 20 trigger status indicators will reset them until next trigger.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 13 / 31
5.2. Sub-menu “PULSE SETUP OUTPUT”
Tapping in the “PULSE OUTPUT” window on the main menu will open a sub-menu with the channel
settings depicted in the following figure.
DELAY
parameter is the delay of the
channel, relative to T0, in ps.
AMPLITUDE parameter is the voltage level
of the channel, in mV.
WIDTH
parameter is the width of the
channel, in ns.
POLARITY parameter is the quiescent level
of the channel.
TRIGGER parameter is the trigger source of
the channel.
Notes:
-At power on, all channels trigger are set to INH (disabled).
-To set delay, amplitude or width, tap on the corresponding window to open the sub-menu.
-To change polarity, tap on the button in the polarity window ( ).
-To change the trigger source tap on the corresponding source button.
-The displayed channel can be changed with the scroll bar at the bottom of the screen (left or right)
directly in this sub-menu.
-The sub-menu can be closed by taping and dragging up the center of the bottom scroll bar.
The following chart described the trigger source, amplitude, width and polarity possible value for each
channel.
T0 to T20
TRIGGER
SOURCE
Disabled (INH)
Repetitive F1 (F1)
Repetitive F2 (F2)
Repetitive F3 (F3)
Single Shot 1 (SS1)
Single Shot 2 (SS2)
AMPLITUDE 3000 mV to 6000 mV in 10 mV steps
WIDTH 100 ns to 300 ms in CLK RF steps

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 14 / 31
POLARITY Positive : quiescent level of the channel is 0V
Negative : quiescent level of the channel is at amplitude level
T1 to T20
DELAY 0 to 9 999 999 999 999 ps in 100 ps steps or 1 ps steps (option)
The default values of the equipment are the following:
•IP ADRESS : 99.0.0.18
•GATEWAY ADRESS : 99.0.0.01
•NET MASK : 255.0.0.0
•F1 : 1000 Hz
•F2 : 100 Hz
•F3 : 10 Hz
•Level: 5.00 V
•Width: 500 ns
•Trigger source: INH
•Polarity: Positive

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 15 / 31
5.1. Sub-menu “Delay”
Tapping in the “DELAY” window on the “PULSE SETUP OUTPUT” sub-menu will open another sub-menu
with the delay settings of the channel depicted in the following figure.
To set the channel delay, enter the value with the numbers, then tapping on the unit (ps, ns, µs, ms or s)
will validate the setting.
Erase
Exit sub-menu
Note: Out of range values are rejected.
5.2. Sub-menu “Amplitude”
Tapping in the “AMPLITUDE” window on the “PULSE SETUP OUTPUT” sub-menu will open another sub-
menu with the voltage level settings of the channel depicted in the following figure.
To set the channel level, enter the value with the numbers in millivolts, then tapping on the validate button
will send the setting.
Erase
Exit sub-menu
Validate
Note: Out of range values are rejected.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 16 / 31
5.3. Sub-menu “Width”
Tapping in the “WIDTH” window on the “PULSE SETUP OUTPUT” sub-menu will open another sub-menu
with the width settings of the channel depicted in the following figure.
To set the channel width, enter the value with the numbers in nanoseconds, then tapping on the validate
button will send the setting.
Erase
Exit sub-menu
Validate
Note: Out of range values are rejected.
5.4. Sub-menu “INTERNAL FREQUENCIES SETUP”
Tapping in the “INTERNAL FREQUENCIES” window on the main menu will open a sub-menu with the
internal frequencies settings depicted in the following figure.
To set the frequencies, tap on the window corresponding to the internal frequency to configure.
Notes:
-F1 is the highest frequency.
-F3 is the lowest frequency.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 17 / 31
5.5. Sub-menu “Frequency”
Tapping in the “F1”, “F2” or “F3” window on the “INTERNAL FREQUENCIES SETUP” sub-menu will open
another sub-menu with the corresponding frequency settings depicted in the following figure.
To set the frequency, enter the value with the numbers, then tapping on the unit (Hz or KHz) validate the
setting.
Erase
Exit sub-menu
Notes:
-Out of range values are rejected.
-The frequency values can be set in a 1 – 2 – 5 sequence.
-F1 > F2 > F3 and minimum gap of 2 between F1 and F2 or F2 and F3.
5.6. Sub-menu “NETWORK ADDRESS SETUP”
Tapping in the “STATUS” window on the main menu will open a sub-menu with the network address
setup as depicted in the following figure.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 18 / 31
5.7. Sub-menu “IP Address”
Tapping in the “IP Address” window in the “NETWORK ADDRESS SETUP” sub-menu will open another
sub-menu with the IP address setup as depicted in the following figure.
Erase
Exit sub-menu
Validate
Notes: Submenus “NETWORK MASK” and “GATEWAY ADDRESS” are identical.
5.8. Front panel “Run/Stop” button
The front panel ‘Run/Stop’ button enables channels programmed with a single shot trigger source (SS1 or
SS2) to trigger each time a pulse is present on the rear panel ‘TRIG IN’ input.
Each press of the button will change the state alternately.
When in ‘Run’ state, the led inside the button lights in red.

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 19 / 31
6. REMOTE CONTROL
6.1. Connection
To connect over the LAN, follow these steps:
•Connect the instrument LAN connector to the remote control computer,
•On the user interface, either specify the LAN address,
•On the remote controlcomputer, enter the instrument’s IP address,
•After the connection has been established, the following commands can be used to modify the
settings:
oSet the instrument’s IP address with: IP XXX.XXX.XXX.XXX
oQuery the instrument’s IP address with: IP? ⇒:IP XXX.XXX.XXX.XXX
oSet the instrument’s IP mask with: NM XXX.XXX.XXX.XXX
oQuery the instrument’s IP mask with: NM? ⇒:NM XXX.XXX.XXX.XXX
oSet the instrument’s IP gateway: GW XXX.XXX.XXX.XXX
oQuery the instrument’s IP gateway with: GW? ⇒:GW XXX.XXX.XXX.XXX
6.2. Command structure
MODEL 745-20C is compatible with all command of the LIL timing system.
Each command description has at least some of the following items:
•Full command syntax
•Form Set / Query
•Brief description
•Parameters
•RST value
•Specified limits
•Example

User's Manual - MODEL 745-20C NUT 063 Ed. 2.2 September 2015
Berkeley Nucleonics Page 20 / 31
6.2.1. IDENTIFICATION
Syntax: *IDN?
Form: Query
Description: Query instrument identification. Response gives instrument model, serial
number and firmware version.
Parameter: -
RST value: -
Example: Answer: GFTy/MIPSI,MODEL 745-20C,SN54001/000000,V1.0
Instrument model: MODEL 745-20C
Serial number: 54001
Firmware version: 1.0
6.2.2. DELAY
Syntax: DELAY T<n>,<D>
DELAY? T<n>
Form: Set & Query
Description: Query delay of channel T<n> or set the delay of channel T<n> to <D>
picosecond (relative to T0 channel)
Parameter: <n>: Channel number (1 to 20)
<D>: Delay value (in picosecond)
RST value: Last value set
Range: 0 to 9 999 999 999 999 ps
Example: Set 1 ns delay on channel 2: DELAY T2,1000
Query delay on channel 2: DELAY? T2 (Answer: :DELAY T2,1000)