Brookhaven BI-9000AT Correlator Board (ISA)

The Brookhaven BI-9000AT Correlator Board is a full-length ISA bus card designed for high-speed photon counting and correlation analysis in dynamic and static light scattering experiments. It delivers real-time data acquisition and processing with 100% efficiency across delay times spanning over 10 decades, enabling precise measurement of particle size, molecular weight, and diffusion coefficients in laboratory research.

## Technical Specifications

**Correlation Modes:** Auto- and cross-correlation with photon counting for static light scattering (SLS).

**Delay Time Range:** 25 ns to 1,310 seconds, adjustable across 10+ decades with 100% real-time efficiency.

**Channel Configuration:** Up to 522 channels standard, with optional high-speed channels at 25, 50, 75, 125, 150, 175, 225, 250, 275, 325, 350, and 375 ns. Middle and low-speed circuits operate independently as simultaneous correlators.

**Sampling Times:** 25 ns to 40 ms, including standard intervals of 1.6 ms, 2.4 ms, and 20 ms.

**Maximum Count Rate:** 40 Mcounts/s (4 × 10⁷ counts/second).

**Input Specifications:** TTL levels, 50 Ω impedance, 5 ns minimum pulse width. Optional external converters support alternative input levels.

**On-board Processor:** Integrated microprocessor for circuit control and correlation function collection. No prescaling required.

**Power Consumption:** 22 W nominal; 12 W with Power Saver feature enabled. Power Saver automatically removes power from unused high-speed channels.

**Operation Modes:** Automatic and manual with user-definable macro commands for sequence control.

## Key Features

• Full AT-compatible ISA bus card, 33.5 cm length, ~100 grams
• Four coaxial Lemo input connectors for middle and low-speed correlators
• Two 4-pin Lemo connectors for low-voltage detector power
• I/O port occupancy: 300H–313H (conflict-free configuration required)
• Operating temperature: 10 °C to 75 °C
• Humidity rating: 0% to 95%, non-condensing

## Typical Applications

Dynamic light scattering (DLS) and static light scattering (SLS) measurements in particle characterization, macromolecular analysis, and materials science research.

## Compatibility & Integration

ISA bus-compatible personal computers with available I/O port space 300H–313H. Verify no address conflicts with existing expansion cards before installation.