The Model 725 provides eight functional channels, or internal signal paths. At any time, each channel can be assigned one of eight timing modes. Timing modes include clocks, counters, delayed pulses after triggers, etc.





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  • Description
  • Additional information


The Model 725 coordinates, integrates and synchronizes complicated setups, simply, reliably and affordably. Featuring eight timing channels with programmable logic, unique timing modes and 10 ns resolution, the Model 725 outperforms a rack full of instruments, specialized boxes, filters and cables. Inputs can be logic signals, switches, transducers, interlocks, computer commands and gauges. The Model 725 can be programmed and controlled easily via LabVIEW or Windows. It contains sophisticated logic, gating and filtering. It has eight inputs, eight outputs and eight separate timers.

Researchers and system integrator s, needing controls and diagnostics for their experiments and systems, are regularly forced to build from scratch or to piece together several boxes. Many hours are spent learning the idiosyncrasies of each box and how to properly couple boxes to each other. Each box has its own programming protocol. Valuable time is lost to tracking connections, taming noisy signals, adjusting timing on multiple boxes and other aggravating chores. Now, one box will eliminate such issues.


The Model 725 logic is engineered for fast data throughput (11 ns) and minimal throughput spread (~1 ns). It would be difficult to match this performance with external cabling and hard-wired logic.


Multi-trigger digital delay generator

Timing Diagram for Model 725 shows Independant Timers for Each Channel, Interrelated


The Model 725 hardware controller can operate in stand-alone mode or via computer control. The computer control system uses its own user-friendly software, timerPRO or LabVIEW,™ both tested and proven in many experiments. timerPRO makes it easy to create sophisticated control schemes from your PC. With the Model 725 linked to your computer, you will quickly program, refine and expand experiments. Using stand-alone mode, you can store and recall up to 64 complete settings, then trigger and monitor an experiment from the Model 725’s front panel. You will have the flexibility to design experiments offline, then to embed the controller in your test environment for “set and forget” operation. The firmware in the Model 725 is field upgradeable, allowing access to new timing modes and capabilities as they become available. timerPRO’s opening window summarizes the settings and lets you configure them.

Additional information

Dimensions24.2 × 20.8 × 6.0 cm
Trigger-pulse delay50 ns1370s-delays over 20 s have 640 ns timing resolution
Trigger-pulse duration7.7 µs1370 s-
Delay resolution10 ns10 ns-
Duration Resolution10 ns10 ns-
Delay jitter from synchronous source-10 ns-
Delay jitter from internal source-200 ps50ps
Absolute timing accuracy-0.01%0.001%0 to 50°C
Internal Timing1.5625 MHz100 MHz-
External timing1 MHz100 MHz-
External trigger pulse duration50 ns--
Inputs--8 external 7 internal
Outputs--8 internal (to timing processors)
Throughput delay-11 ns10 ns
Width208 mm (8.2")black enamel-coated anti RFI steel enclusure electrostatically shield
Length242 mm (9.5")
Height60 mm (2.4")
Input impedance--4.7kΩDC
Input capacitance--20 pF
Output voltage levelsTTL-compatible
Logical high3.5 V4.9 V4.5 V1kΩload
Logical low0.0 V0.2 V0.1 V
Output source/ current
Logical high32 mA-50 mAShort-circuit current
Logical low64 mA-80 mAShort-circuit current
Output rise time--10 nS1kΩload
input/ output voltage protection-30 V+30 V-
  • Standard RS-232 interface, (e.g., external IBM PC-compatible COM port)
  • 38400 baud, 1 stop bit, no parity, RTS/CTS(hardware) flow control
  • Unit is supplied with cable for 9-pin D connector
  • PC-compatible computer
  • Trigger software for Windows 95, NT, Me, 2000, XP or later, included
  • LabView drivers available
  • Other enviroments: Call for details
VOLTAGE-100-250 VAC 50-60 HZexternal male AC connector with fuse, internal cooling fan internal fuse DC supply
Specifications CertificationCE

The Model 725 provides eight functional channels, or internal signal paths. At any time, each channel can be assigned one of eight timing modes. Timing modes include clocks, counters, delayed pulses after triggers, etc. You can set various properties for each timing mode—for example, the delay length on a Delayed Pulse After Trigger. All modes are aligned to a precise, 100 MHz internal clock or an external clock, allowing resolution down to 10 ns. Each channel also includes logic settings which specify the conditions that will trigger the channel. A channel can be triggered by any logical combination of signals from the eight inputs and/or the outputs of other channels. The timing properties and logic that you set up in timerPRO can be transferred and stored in the memory of the Model 725. You can store up to 64 variations of these properties in settings profiles in the Model 725. You can then switch between settings profiles to switch experiments, compare different timing scenarios, or simulate different real world conditions. All settings and setting profiles for a particular experiment can be stored as an experiment file on your computer. Experiment files bear a .trg extension.

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