Astronics / EADS / Trig-Tek 850A Contact Chatter Detector

The Astronics / EADS / Trig-Tek 850A Contact Chatter Detector is a 10-channel instrument for monitoring switch and relay contact continuity under environmental stress. It identifies intermittent faults in electrical and mechanical systems by detecting contact anomalies with precision timing and current control. The unit supports both Normally Closed (NC) and Normally Open (NO) contact configurations, selectable per channel via toggle switch.

## Technical Specifications

• **Channels:** 10 independent channels with individual fault indication
• **Contact Modes:** NC and NO, toggle-selectable per channel
• **Current Source Compliance:** 3 Volt maximum per channel
• **Current Source Accuracy:** ±3% Full Scale
• **Contact Current Range:** 0.1 mA to 11 mA, adjustable for all channels simultaneously
– X0.1 position: 0.1 mA to 1.1 mA
– X1 position: 1 mA to 11 mA
• **Timing Interval:** 1 µs to 999 µs or 1 ms to 999 ms via dual selector switches
• **Timing Interval Accuracy:** Setting ±3 LSB
• **Fault Output:** 12 Volt for fault condition, 0 Volt for no fault per channel
• **Power Requirements:** 117 or 234 Volts RMS AC, selectable via internal switch
• **Dimensions:** 19 inches wide × 3.5 inches high × 8 inches deep

## Key Features

• Individual fault latch per channel with dedicated LED indicator
• Manual fault reset via front panel switch or remote reset terminal
• Adjustable contact current dial with dual-range multiplier (X1, X0.1)
• Precision timing interval control via microsecond/millisecond selector and thumbwheel
• Per-channel fault output terminals for external integration

## Compatibility & Integration

• **850A Model:** BNC connectors for 10-channel input
• **850B Model:** Terminal interface for channel inputs
• Fault reset capability via front panel or dedicated remote terminal
• Electrical fault signals enable integration with external monitoring systems