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Model 745T Digital Delay / Pulse Generator

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    Model 745T Digital Delay / Pulse Generator

    Manufacturer: Berkeley Nucleonics Corporation

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    • Description
    • Features
    • Specifications
    • Downloads

    Model 745T synchronizes to an external clock at 10 MHz or 80 MHz making the unit ideal for a broad range of applications that require short time domain delays.

    The Clock In Connector and Clock Out Connector, are located on the rear panel of the instrument. A convenient Ethernet interface on the rear panel, allows remote control of the instrument. Berkeley Nucleonics' DDG-MUC software controls up to eight instruments (64 Channels). Alternatively, you may use the LabVIEW driver or a new “Web-Command” interface embedded in the unit itself. The control software and LabVIEW drivers are included with the Model 745T at no additional cost.

    Because many industries are now moving away from locally installed software packages, we have embedded a control interface in the Model 745T instrument. This also allows all parameters to be controlled by any PC with a browser. You will need to enter the unit's IP address into the browser after connecting a cable from the Ethernet port to your computer network. The instrument will provide an IP address on the front panel display and the browser will open a virtual control panel. This is ideal for laboratories where you may need to move the delay generator to different locations.

    JITTER

    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

    Model 745T Back Image

    TRIGGERING

    The Model 745T Digital Delay Generator offers users several options for triggering timing channels: External, Internal and Remotely. 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. 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.

    PACKAGING

    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.

    OUTPUTS

    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

    Model
    Description
    745T-4C Standard Touchscreen Model, 4 Precision Channels
    745T-8C Standard Touchscreen Model, 4 Precision Channels, 4 Additional Channels
    745-RM Rack Mount, accomodates 1ea or 2ea Model 745T units
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    Add GFT200 module Optical to Fast Electrical Pulse of 10 volts under 50Ω
    Add P/N 7130 module Output pulse 32V amplitude under 50Ω
    Add GFT400 module 2V under 50 Ω, narrow 500ps width pulses

    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.

     Optional Channel Feature




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