#502 UnoBldg., 219 Dogok-ro, Gangnam-gu, Seoul 06231, Korea
745T Femtosecond Digital Delays with 5 Picosecond Jitter

Model 745T 디지털 지연 생성기 (DDG)는 벤치 탑 타이밍 계측기에서 세계 최고의 성능을 제공합니다. 25 년 전, 당사의 모델 7095 디지털 지연 생성기는 25ps 미만의 지터로 연구를 획기적으로 개선했습니다. 이제 최신 DDG의 모든 기능을 갖춘 Model 745T는 적은 비용으로 놀라운 성능을 제공합니다. 모델 745T는 전면 패널에서 4 개의 정밀한 지연 채널 (2ns 미만의 출력 상승 시간)을 제공하며 후면 패널의 추가 4 채널 옵션 (5ns 미만의 출력 상승 시간)을 제공합니다. 모델 745T는 10MHz 또는 80MHz의 외부 클록 또는 10MHz와 80MHz 사이의 맞춤형 주파수와 동기화되어 단시간 도메인 지연이 필요한 광범위한 애플리케이션에 이상적입니다.

Clock In Connector 및 Clock Out Connector는 계측기 후면 패널에 있습니다. 후면 패널의 편리한 이더넷 인터페이스로 기기를 원격으로 제어 할 수 있습니다. Berkeley Nucleonics의 DDG-MUC 소프트웨어는 최대 8 개의 계측기 (64 채널)를 제어합니다. 또는, 설정 및 제어가 용이하도록 LabVIEW 드라이버 또는 내장 웹 인터페이스를 사용할 수 있습니다. 컨트롤 소프트웨어 및 LabVIEW 드라이버는 추가 비용없이 Model 745T에 포함되어 있습니다.

많은 산업이 현재 로컬로 설치된 소프트웨어 패키지에서 멀어지고 있기 때문에 Model 745T 계측기에 제어 인터페이스를 내장했습니다. 또한 웹 브라우저가있는 모든 PC, Mac 또는 Linux 시스템에서 모든 매개 변수를 제어 할 수 있습니다. 이더넷 포트에서 컴퓨터 또는 네트워크로 케이블을 연결 한 후 장치의 IP 주소를 브라우저에 입력하기 만하면됩니다. LAN 포트를 사용할 수없는 경우 USB 포트도 사용할 수 있습니다. 이더넷 포트를 통해 사용자는 웹 인터페이스를 사용하거나 USB가 SCPI 인 동안 SCPI 명령을 보내고받을 수 있습니다. 지연 발생기를 다른 위치로 이동해야하는 실험실에 이상적입니다.




The Model 745T virtually eliminates triggering indeterminacy by having a clock that is now in phase with an External Trigger. The resulting external trigger jitter is far better than instruments whose outputs are synched to an internal free-running clock. See the datasheet for exact jitter specification and additional details on “Achieving 2 Picoseconds Jitter in a DDG”. The following chart indicates typical jitter at various delays:

  • Internal Trigger, Delays < 100ns: 2 picoseconds
  • Internal Trigger, Delays > 100ns: 15 picoseconds + timebase
  • External Trigger, Delays < 100ns: 25 picoseconds
  • External Trigger, Delays > 100ns: 25 picoseconds + timebase

Back of Model 745T


The Model 745T Digital Delay Generator offers users several options for triggering timing channels: External, Internal, and Remotely (Remote trigger: only asynchronous Single-Shot). Externally trigger on the positive or negative slope of your trigger signal and select a level from 0.lV to 5.0V. Two internal trigger generators are adjustable from 0.25 Hz to 1 MHz in 1 Hz increments (note: it’s possible to set the period by step of 5ns as well, the range is then 1µs to 4s by step of 5ns). These internal rep rate generators may be started by front panel pushbutton or remotely via your software interface. Either trigger mode may be set as one-shot or repetitive.

BURST MODE, for instance: pulse number 2 to 2^16-1, period 1000ns to 1s (depending on the trigger rate)

TRIGGER PRESCALER, for instance: prescaler value applied to the external trigger goes from 1 to 2^16-1

GATE MODE, for instance: can be set to General or individual channel

*See the user manual for more details.


The Model 745T Digital Delay Generator is housed in a compact design. The packaging dimensions are of 8.5″ X 9.6″ x 5.3″. The convenient design allows two instruments (up to 16 channels) to fit side-by-side in a 19″ rack mount (sold separately). This small footprint allows for many channels packed into a small space on a bench or in a rack system. Berkeley Nucleonics offers a variety of custom packaging options as well. For even tighter space constraints, ask about a cPCI card-level version of the Model 745T or a custom enclosure design. Multi-instrument applications may find that operating from a single master clock may be useful. The standard benchtop package can be mounted with one or two instruments in a 19″ rack.


On the front panel there are four standard Outputs, one external Trigger Input, and one Gate Input. Optionally, four more Outputs can be available on the front panel as well (total eight channel outputs) On the rear panel, there are Clock In, Clock Out, T0, and Auxiliary connectors.

Ordering Instructions

Model NumberDescription
745T-4CStandard Touchscreen Model, 4 High Precision Channels
745T-8CStandard Touchscreen Model, 4 High Precision Channels, 4 Standard Channels

Add On Module / Options

Model NumberDescription
745-RMRack Mount System. Accommodates one or two Model 745T units
GFT101Electrical to Optical Converter – Takes a 2.5V to 10V input and produces a 1310nm output with 1 ns Risetime and 30ps RMS jitter. The convertor connects to the front panel of the Pulse/Digital Delay Generator. The optical pulse is appx 0.3mW and allows long range transmission in remote locations. 
GFT500200ps Fast Rise Time Step Generator Module – This device provides fast Step Pulses with <2ps RMS jitter and amplitudes from 4V to 9V, settable by the factory. Connectors are high speed SMA. 
GFT200Optical to Fast Electrical Pulse of 10 volts under 50Ω – This unit takes 1310nm wavelength pulses at -15dBm or better, and converts them to 10V output pulses with 30ps RMS jitter. This unit enables long range transmission of timing signals. 
GFT632High Voltage Module – Offers fast output pulse 32V amplitude under 50Ω, < 3ns rise time – This module is externally triggered and provides high voltage pulses with fast risetimes. The device can be up to 20 meters from your pulse generator so it is closer to the device being triggered. A 70V option is also available with widths of 1uS and risetime of 1.2 nanoseconds. 
GFT400Narrow Pulse Module – Achieve 2V into 50 Ω with narrow 500ps wide pulses. Jitter is <5ps RMS and the module operates on standard 12V AC/DC adapters. Input signals can be as low as 1.5V and require a width of >10ns. 

Optional Channel Feature — Channel Grouping

Rise times below 1 nanosecond and Pulse Widths down to 10 nanoseconds are achieved by Channel Grouping. In this example, we group Channel 1 + Channel 2. The jitter is below 5 picoseconds and the delay and width resolution are both 250 femtoseconds. Contact the customer support for special output requirements. Available with GFT400 Module.


Channels4 or 8 independent delay outputs
Range0 up to 20s
Resolution 1 ps
RMS Jitter25 ps + delay x 10e-8 (T0 to any output)
Accuracy< 250 ps + delay x 10e-8
Time Base50 ppm stability

Trigger source (repetitive / shots / burst)

InternalTwo Timers, F= 0.25 Hz to 1 MHz

1 trigger input

Software Asynchronous single shot

Output T0 5 V / >50 Ω, 100ns to 10µs

Posititve or negative slope

Minimum trigger delay < 65 ns

ControlFront Panel or Remote via Ethernet or USB

Outputs T1 to T4

Amplitude2 V to 5 V / 50 Ω
Rise/Fall time< 2 ns / <2 ns
Width100 ns to 10µs
Clock InputStandard 10 MHz and 80 MHz     *ask factory for custom clock frequency


Interface Control

Front panel, Ethernet/

Internet (Webpage)

SoftwareFree Drivers for Win7
SizeRack 19″, 2U, D= 300mm
Power90 to 220 VAC / 0.5 A

Software, firmware and drivers

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Manuals and support documents 



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Model 745 Femtosecond Front Panel Controls

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Diplaying Dual Frequencies with the Model 745

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BNC Pulse Generator Output Modules – Overview