Femtosecond Digital Delays with 5 Picosecond Jitter
New Product Press Release | Ethernet Programming Application Note | Labview Driver
The Model 745 Digital Delay Generator (DDG) offers the world's leading performance in a benchtop timing instrument. 25 years ago, our Model 7095 Digital Delay Generator dramatically advanced research with jitter below 25 picoseconds. Now, with all the features of a modern DDG, the Model 745 gives users incredible performance at a fraction of the cost. The Model 745 offers 4 precision delay channels from the front panel with an additional 4 channel option on the rear panel. The output risetime is 1 ns and the user may specify the frequency of the external clock. The Model 745 syncs to an external clock between 10 MHz and 80 MHz making the unit ideal for a broad range of applications requiring short time domain delays.
The optional channels (outputs for Ch 5 - 8) along with the Gate Out Connector and Clock Out Connector, are located on the rear panel of the instrument. A convenient Ethernet interface on the rear panel, allows control of the instrument. Berkeley Nulceonics' DDG-MUC software controls up to 8 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 745 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 745 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. See our video on Browser-Based Instrument Controls.
The Model 745 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 sync’ed 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 745
The Model 745 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 0.1V to 5.0V. An internal trigger generator is adjustable from 1 Hz to 50 kHz in 1 Hz increments. This 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.
The Model 745 Digital Delay Generator is housed in a compact design. The packaging dimensions are of 8.5" X 9.6" x 5.2". 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 many channels to be packed into a small space on a bench or in a rack system. Berkeley Nucleonics can offer a variety of custom packaging options as well. For even tighter space constraints, ask about a cPCI card-level version of the Model 745 or a custom enclosure design. Multi-instrument applications may find operating from a single master clock useful. The standard benchmount package can be mounted in a 19" rack with one or two instruments.
On the front panel there are four standard Outputs and one external Trigger Input. On the rear panel, there is a Clock Input and a To Output. There are 4 optional outputs on the rear panel in addition to a Gate In and Clock Out connector.
Ordering Instructions -
Order according to the following chart -
||Standard Model, 4 Precision Channels
||Standard Model, 4 Precision Channels, 4 Rear Panel Channels
||COG Includes Timebase Upgrade, 4 Channel Unit
||COG Includes Timebase Upgrade, 8 Channel Unit
||Rack Mount, accomodates 1ea or 2ea Model 745 units
Optional Channel Feature -- Channel Grouping
Rise times below 1ns and Pulse Widths down to 10ns 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 factory for special output requirements.
• 250 fs time resolution
• Down to 5 ps jitter (int trigger)
• 25 ps jitter (ext trigger)
• Output risetimes typically 1 ns
• Selectable clock inputs (10MHz to 80MHz, user may specify a value to the nearest 100 kHz)
• Ethernet GUI - Complete Configuration Displayed
• Up to 64 Channels Displayed on 1 GUI
• Sync with selectable external clock frequency - Mode Locked Lasers
• Delay and Gate ICCDs
• Control Flashlamps and Q-Switches
• Gate High Speed Cameras
• Triggering Ballistics Testing
• Radar / Lidar Testing