Model 745T-20C

Model 745T-20CTwenty (20) Channel Digital Delay Generator

The Model 745T-20C Digital Delay Generator provides users with an amazing twenty independent channels of pulse delay and width. This multi-channel Digital Delay Generator provides delay resolution of 100 picoseconds (ps) with an optional 1 picosecond (ps) resolution. The jitter is less than 25 ps with internal or external triggers.

Overview

Overview 

Quick Specs

Applications

  • Channels: 20 Independent Channels
  • Resolution: 100 ps (standard)
  • Accuracy: < 250 ps + delay x 10-7
  • Jitter: 25 ps (T0 to any Output)
  • Jitter: 50 ps (Ext Trig IN to any Output)
  • Voltage: 2 to 5 V, step < 0.1 V / 50 Ω
  • Memory: 4 Sets of Parameters
  • Large Area Timing
  • Multiple Outputs
  • Explosive Testing
  • Precision Laser and Camera Timing
  • High Precision Pulse/Gate Application

The Model 745T-20C delivers up to 6 V into 50 Ω, meeting all TTL applications. The levels are adjustable on a channel-by-channel basis giving you complete time and amplitude domain control. The fast outputs, with risetimes of 1 ns, are on the rear panel for an elegant look for complex experiments. The front panel controls are accessed by a touchscreen interface with several programming options (Ethernet, etc) for remote control.

 All parameters (delay/amplitude/width/trigger) may also be controlled with an embedded GUI that opens in an HTML browser such as Internet Explorer, Firefox, or Chrome at 10 or 100 Mb/s rates.

The Model 745T-20C is uniquely suited to gate, delay, pulse and synchronize many experiments in the nanosecond and picosecond domain. The space saving, reduced calibration costs, and simple control of so many channels are ideal for users of multiple channels of timing.

Triggering

The Model 745T-20C Digital Delay Generator offers users several options for triggering timing channels: External, Internal and Remote. Externally trigger on the positive slope.  The internal rep rate generator may be started by front panel pushbutton or remotely via your software interface. Either trigger mode may be set in one-shot or repetitive.

Expand to 40 or 60 channels

The Model 745T-20C can be expanded to provide up to 60 channels, all with the same high performance. *Note: external triggering is not available for 40 / 60 channels. 

Specifications 

Delays

Number of Channels 20 independent delay outputs
Range 0 to 10 s
Resolution 100 ps (standard)

1 ps (option 4)

RMS Jitter 25 ps (T0 to any output)
Accuracy < 250 ps + delay x 10-7
Time Base 0.05 ppm stability

Trigger source

Internal 3 generators 0.1 Hz to 10 kHz in 1-2-5 sequence
External Rate up to 50 kHz, 1 V/50 Ω Threshold, slope positive; 5 ns minimum pulse width
Command 2 Single Shots

Outputs T1 to T20

Amplitude Adjustable 3 V to 6 V into 50 Ω
Rise/Fall time 5 ns/ 5 ns
Width 100 ns to 300 ms
Polarity Active Low / Active High
Connector BNC
Clock Input (1) 10 MHz to 100 MHz (customer choice fixed input)

General

Interface Control Front panel, Ethernet / Internet (web page or SCPI)
Software Free Drivers
Dimension
Weight

Rack 19"  2U  19"W x 3.5"H x 12"D [48.25mm x 8.9mm x 30mm] *with mounting ears
22 lbs [10 kg]

Power Autovolt 90 to 220 Vac / 0.5 Amp
Shipping Dimensions 24x19x12"
Shipping Weight 25 lbs
Options 
Option 1 Output 10 V (2) Amplitude = 2.5 V to 10 V, rise/fall time = 1 ns/3 ns into 50 Ω, width = 100 ns to 10 ms
Option 2 Output 20 V (2) Amplitude = 5 V to 20 V, rise/fall time = 3 ns/15 ns into 50 Ω, width = 0.1 us to 10 us
Option 3 Output 32 V (2) Amplitude = 32 V Fixed, rise/fall time = <3 ns/ <15 ns into 50 Ω, width = 1 us Fixed
Option 4 1 ps Delay Resolution [<10 ps RMS Jitter from T0 to Ch 1 to 10 and < 20 ps Jitter from T0 to Ch 11 to 20
Option 5 Optical Output [850 nm with ST Connector]
Option 6 Clock Input and Output Frequency 10 MHz to 100 MHz
Option 7 40 Channels -- Two 745T-20 Synchronized and fine tuned at factory

Example How to Configure 

Step 1: Choose Resolution 100 ps or 1 ps
Step 2: Choose Clock Frequency 10 MHz or 100 MHz or custom*
Step 3: Choose Output Frequencies *dependent on Clock Frequency
Step 4: Choose Output Pulse Amplitude TTL (Standard)

2.5 V to 10 V, Square

5 V to 20 V

32 V (4 Channel Max)

Technical resources 
Frequently Asked Questions (FAQ) 

Model 745T-20C | What if I need more than 20 channels of timing in my system ? 

Model 745T-20C | What if I need more than 20 channels of timing in my system ? 

The Model 745T-20C offers 20 channels per enclosure and can be daisy chained with additional units to a single trigger. However, for complex multi-channel applications, contact the factory. We can offer a custom card-level solution which may be more cost effective. 

Downloadable Resources 

Downloadable resources such as datasheets, firmware, software, drivers and products manuals. Alternatively, you can browse resources directly by visiting our downloads page.

Product Datasheets
• Product Firmware
• Product Software and Drivers
• Product Manuals

Media

Media 
Video URL 
Video title 
Dual Frequencies with the 745-XX Platform
Video URL 
Video title 
Model 745 Series Delay Generators enters Femtosecond Timing Domain
Video URL 
Video title 
BNC Pulse Generator Output Modules - Overview
Video URL 
Video title 
Webinar on Fast Pulse/Low Jitter Timing Solutions

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