Model 725 Multi-Trigger Digital Delay Generator

1Overview

The Model 725 coordinates, integrates, and synchronizes complex experimental setups. It pairs eight timing channels with programmable logic and 10 ns resolution, so a single instrument can watch several inputs and decide when to fire each output. Berkeley Nucleonics offers it as an upgrade to the discontinued PSPL2600C pulse generator.

The 725 carries eight inputs, eight outputs, and eight separate timers. Each timer triggers independently, and the timers can be combined through logical operations: AND, OR, XOR, and negated forms. That logic layer is what separates the 725 from a conventional delay generator. It is engineered for fast data throughput, 11 ns typical, with minimal spread of about 1 ns, and it includes sophisticated gating and filtering. The instrument runs stand-alone or under computer control through timerPRO or LabVIEW software.

2Key Features

• Eight timing channels with programmable logic
• Eight independent timers, each with its own timing mode
• 10 ns delay resolution
• Eight inputs and eight outputs
• Fast data throughput, 11 ns typical
• Minimal throughput spread, about 1 ns
• Stand-alone or PC-controlled operation
• Up to 64 storable complete settings
• Sophisticated logic, gating, and filtering
• Field-upgradeable firmware

3Trigger Logic & I/O

The heart of the 725 is its logic engine. Eight external inputs and seven internal logic inputs feed eight internal logic outputs that drive the timing processors. Each of the eight timers can be triggered on its own, and timers can be combined with boolean operations to express conditions like fire output 3 only when input 1 and input 2 both arrive, or when input 4 arrives but input 5 does not.

Logic resources

Input and output electrical behavior

4Specifications

5Triggering & I/O

The 725 triggers from internal or external timing. Internal timing covers 1.5625 MHz to 320 MHz, while external timing accepts 1 MHz to 100 MHz. An external trigger needs a pulse of at least 50 ns. Trigger pulse delay spans 50 ns to 1370 s, and duration runs from 7.7 µs to 1370 s. On the 725B, a pulse-stretch mode lowers the minimum duration to 10 ns.

Internal delay jitter is 50 ps typical and 200 ps maximum. Jitter referenced to a synchronous source is 10 ns maximum. Absolute timing accuracy is better than 0.0001% typical across the 0 to 50°C operating range. Communication is over RS-232 at 38400 baud through a DE-9F connector, and the instrument is controlled by the included timerPRO software or a downloadable LabVIEW driver.

6Options & Configurations

The 725 ships with timerPRO software included and a downloadable LabVIEW driver for integration into automated test environments. The firmware is field-upgradeable, so new logic and timing capabilities can be added without returning the unit.

• timerPRO control software, included
• LabVIEW driver, available for download
• Field-upgradeable firmware
• Up to 64 complete settings stored in stand-alone mode

7Applications

• Ballistics
• Multi-trigger input experiments
• Explosive testing
• Airbag (squib) testing
• Fluid dynamics
• High-speed gas flow
• Combustion-driven shock tubes
• Two-pulse laser experiments
• Pressure sensing and detonation control

These applications share a common need: several events arrive on independent inputs, and the system must combine them logically before acting. The 725 handles that decision in hardware, with throughput measured in nanoseconds.

8Ordering

The Model 725 is a multi-trigger digital delay generator with eight timers, eight inputs, eight outputs, and programmable boolean logic. timerPRO software is included.

To request a quote or discuss a multi-input synchronization setup, contact Berkeley Nucleonics Corporation at info@berkeleynucleonics.com or 800-234-7858.