DS3800HFPC1M1H | GE Mark V 24V DC Frequency Input Module

Description

Product Introduction

The DS3800HFPC1M1H takes the ruggedization of the frequency input board to its highest level with the “1M” suffix—a military-spec circular connector that provides the most secure and reliable connection available on the Mark V platform. This connector is commonly used in aerospace and defense applications, where shock, vibration, and environmental extremes are the norm. The “1H” suffix adds 5A fusing and an extended operating temperature range of -40°C to +85°C, making this board suitable for the harshest environments—offshore platforms, arctic installations, and desert applications.

We’ve used the HFPC1M1H on a naval vessel where the Mark V cabinet is subject to shock loads and salt spray. The circular connector with its threaded locking ring provided a connection that survived the 10g shock test, where other connectors failed. The 5A fuses handled the long cable runs (over 300 meters) to the speed sensors, and the extended temperature range ensured reliable operation in the engine room. The 24V DC input capability matched the proximity sensors used on the ship’s propulsion turbines. The board’s frequency measurement accuracy remained within spec despite the harsh environment.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the MIL-spec circular connector on the 1M suffix?
A: The circular connector with threaded locking ring provides the most secure connection available—it withstands severe shock and vibration without loosening. It’s rated for 500+ mating cycles and has a robust sealing mechanism that resists moisture and contaminants. This is the highest level of connector reliability on the Mark V platform. The downside is cost and availability—you need a custom cable harness with the mating connector.

Q: Is the MIL-spec connector compatible with standard circular connectors?
A: No. The MIL-spec connector on the 1M suffix uses a specific pin configuration and locking mechanism. You cannot use a standard commercial circular connector. You need to order the mating connector from GE or a specialized distributor, or build a custom harness. The connector is typically a 24-pin or 37-pin MIL-spec type (depending on the configuration). Always verify the pinout before wiring.

Q: Why does the 1M1H have 5A fuses?
A: The 5A fuses are for applications with long cable runs (up to 500 meters) where cable capacitance can cause inrush currents on power-up. The 5A rating provides headroom for these inrush currents while still protecting the board from shorts. The extended temperature range (-40°C to +85°C) also requires derating of the fuses—at -40°C, a 5A fuse behaves like a 4A fuse, so the higher rating ensures adequate protection.

Q: What’s the shock and vibration rating of the 1M1H?
A: The 1M1H is rated for 10g at 20-2000Hz (vibration) and 30g (shock) per MIL-STD-810. This makes it suitable for naval, aerospace, and heavy industrial applications. The connector’s threaded locking ring and the board’s internal component mounting are designed to survive these extremes.

Q: Can I use the 1M1H with a breakout board for field wiring?
A: The 1M1H typically does not include a breakout board—you terminate directly to the circular connector. If you need a breakout, you’ll need to build a custom cable with a breakout box at the field end, or use a junction box. This is less convenient than terminal blocks but much more reliable in harsh environments.

Q: How does the extended temperature range affect the board’s performance?
A: The 1M1H is temperature-compensated to maintain accuracy across the -40°C to +85°C range. The frequency accuracy remains ±0.1% of reading over the entire range. The input impedance and filter characteristics are also stable. We’ve tested this board in a thermal chamber and confirmed the performance.

Q: Does the 1M1H have conformal coating?
A: Not by default. The 1M1H suffix indicates the MIL-spec connector and 5A fusing, not coating. However, many 1M variants include conformal coating as a standard feature due to the harsh environment applications. Check with your supplier. If you need conformal coating, look for a suffix with a “G” (e.g., DS3800HFPC1G1H). The standard 1M1H is suitable for outdoor environments but may not resist salt spray or chemicals without coating.

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