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

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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

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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

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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

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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).

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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

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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,

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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.

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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.