The Marconi IFR Aeroflex DT400H is a portable, handheld databus analyzer for testing and troubleshooting avionics systems. It delivers dual-port receive capability, single-port transmit, and comprehensive ARINC 429 analysis with optional Williamsburg protocol support. The instrument combines field-portable design with internal NiCad battery operation exceeding six hours, enabling technicians to perform detailed bus monitoring, signal generation, breakpoint triggering, and data recording across aerospace platforms.
Technical Specifications
Receiver
• 2 ports; bus frequency 12–14.5 kHz or 100 kHz (selectable)
• Input range ±6.5 VDC to ±13.5 VDC (A to B); input impedance 12.0 kΩ
• Word update rate 1 ms to 10 sec (instantaneous, minimum, or maximum display)
• Up to 256 words per SDI per channel
• Display formats: engineering units with pre-stored scaling, hexadecimal, binary, user-defined, graphic plots, or ASCII
• Bus activity monitoring with selectable sensitivity for word loss detection
Transmitter
• 1 port; bus frequency 12.5 kHz or 100 kHz
• Output ±10.0 VDC (A to B); output impedance 75 Ω
• Word update 1 ms to 10 sec (selectable); up to 128 words per channel
• Burst mode 01–99 outputs at selectable rate; transmit word gap 4 bits
• Dynamic transmit: programmable ramps and flat segments from ±full scale, segment times 0–999.999 sec
Breakpoint & Recording
• Label sequence logic (A, B, A or B, A then B, B then A); data conditions EQ, NEQ, OR, GT, LT, /GT/, /LT/
• Event count 1–99 before break; history buffer 24,540 words with selectable time stamp
• Trigger pulse 5 V, 0.02 ms
• Record up to 16 selectable labels at 1 ms–10 sec intervals; capacity 120 kBytes (~8.5 hours at 1-sec intervals)
• Playback: graphic plots, data lists, D/A conversion, RS-232C
BITE & Simulation
• BITE compatibility with 747-400, 737-300, MD-11, A320, A330, A340
• Display 350/351 label maintenance bits with pre-stored text
• Save up to 240 BITE screens; command output selection (NULL, DC1, DC2, DC4) for flight-phase simulation
– Key Features
• Backlit LCD display for field visibility
• Internal NiCad battery; >6 hours operation
• Compact, durable handheld form factor
• Programmable word update rates and burst sequences
• Multi-format data display with custom scaling
• On-board BITE screen storage and export capability
– Typical Applications
Field troubleshooting of avionics databus health; BITE screen capture and analysis; transmit/receive validation during manufacturing and maintenance; dynamic signal simulation for subsystem testing.
– Compatibility & Integration
Supports ARINC 429 standard with optional Williamsburg protocol. Compatible with major commercial and transport aircraft BITE implementations. RS-232C output for data transfer and PC integration.
