Racal Instruments 9478

The Racal Instruments 9478 is a frequency standard distribution system that generates and distributes multiple synchronized frequency outputs to nine independent channels. Designed for automated test equipment, scientific laboratories, and communication systems, the unit provides stable, phase-locked frequency references with independent output control and external standard capability.

– Technical Specifications

Frequency Outputs

• Available frequencies: 1 MHz, 5 MHz, 10 MHz
• Standard configuration: Channels 1–3 output 10 MHz; Channels 4–6 output 5 MHz; Channels 7–9 output 1 MHz
• Internal jumper links permit custom frequency assignment to any channel
• Nine rear-panel BNC connectors for main outputs
• Front-panel 10 MHz monitor output (BNC socket)
• Main output level: 1 V ± 0.1 V r.m.s. into 50 Ω
• Monitor output level: 500 mV ± 100 mV r.m.s. into 50 Ω
• Output sockets withstand continuous short circuit

External Frequency Standard Input

• Supported input frequencies: 1 MHz, 2 MHz, 2.5 MHz, 5 MHz, 10 MHz
• Minimum input level for automatic lock: 100 mV
• Phase lock pull-in range: 10 × 10⁻⁶ of nominal frequency
• “In Lock” indicator confirms synchronization

Indicators & Status

• Individual channel output indicators (front panel)
• External standard detection indicator
• TTL-compatible logic ‘1’ output at rear panel connector on any channel failure
• Loop lock status monitoring capability

Electrical

• Power input: 100 V, 120 V, 220 V, or 240 V AC ±10% (selectable)
• Power consumption: 15 VA

Physical

• Manufacturer: Racal-Dana
• Product type: Frequency Standard Distribution System

– Key Features

• Configurable multi-frequency output architecture
• Automatic phase locking to external master or atomic standards
• Individual channel monitoring with discrete output indicators
• Fail-safe output alarm for channel diagnostics
• Compatible with precision oven-controlled crystal oscillators

– Typical Applications

Automated test environments, metrology labs, communication system synchronization, and multi-instrument test benches requiring precise timing distribution.