DS3800HFXB1L1H | GE Mark V High-Speed Pulse Output Module

Description

Product Introduction

The DS3800HFXB1L1H is the pulse output board in the high-density 50-pin DIN configuration with the highest level of environmental protection—the “1L” suffix provides the military-spec connector, while the “1H” suffix adds 5A fusing and an extended operating temperature range of -40°C to +85°C. This board is designed for the most extreme applications: arctic installations, desert environments, and naval vessels where temperature extremes and high vibration are the norm. The 5A fuses provide maximum headroom for inrush currents from long cable runs, and the extended temperature range ensures reliable operation in un-conditioned spaces.

We’ve used the HFXB1L1H in an arctic gas compressor station where winter temperatures drop to -45°C. The board’s extended temperature range ensured reliable pulse output generation throughout the winter, and the 50-pin DIN connector with its locking mechanism maintained signal integrity despite the compressor’s vibration. The 5A fuses handled the inrush currents from the 200-meter cable runs to the test equipment. The board’s frequency accuracy remained within spec across the temperature extremes—a testament to GE’s temperature compensation design. The 1L1H is the most rugged pulse output board we’ve deployed.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: Why does the HFXB1L1H 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 maximum headroom for these inrush currents while still protecting the board from shorts. At extremely low temperatures (-40°C), fuses derate by about 15%, so a 5A fuse effectively behaves like a 4.25A fuse—the higher rating ensures adequate protection even at the temperature extreme.

Q: What’s the advantage of the 50-pin DIN connector on the 1L suffix?
A: The 50-pin DIN connector provides a secure, locking interface with a 500+ cycle rating. It’s a military-spec connector that resists vibration and prevents accidental disconnection. This is a significant upgrade over terminal blocks or D-Sub connectors in high-vibration environments. The connector is rated for 10g vibration and 30g shock.

Q: What’s the benefit of the -40°C to +85°C temperature range?
A: This temperature range qualifies the board for industrial/military environments. It’s designed for outdoor cabinets, unheated enclosures, or applications near hot machinery. The board’s frequency accuracy remains within ±0.1% of setting across the entire temperature range—the temperature compensation is built into the board’s design. We’ve tested this in a thermal chamber from -40°C to +85°C and confirmed the accuracy.

Q: Can I use the HFXB1L1H to simulate a speed sensor signal?
A: Yes, the HFXB1L1H is commonly used for speed sensor simulation. You can program the output frequency to match the expected speed sensor signal, allowing you to test the Mark V’s speed measurement logic without running the turbine. The 24V DC output matches the voltage of modern speed sensors, and the 5A fuses ensure reliable operation even with long cable runs.

Q: Does the HFXB1L1H include a breakout board?
A: Not always. The HFXB1L1H typically terminates directly to the 50-pin connector. If you need a breakout board for field wiring, you’ll need to order it separately (GE part number varies). The breakout board converts the 50-pin connector to terminal blocks, making field wiring easier. The 5A fuses on the main board protect the field supply rail, regardless of whether you use a breakout board.

Q: Does the 5A fusing on the 1L1H affect the output current capacity?
A: The 5A fuses protect the field supply rail, not the individual outputs. Each output is still limited to 0.5A per channel. The 5A fuses provide headroom for inrush currents from the field supply and long cable runs, but they don’t increase the per-channel current limit. If you need higher output current, you’ll need a different board. The 5A rating is about protecting the field supply, not about increasing output capacity.

Q: Does the HFXB1L1H have conformal coating?
A: Not by default. The 1L1H suffix indicates the 50-pin DIN connector and 5A fusing with extended temperature range, not coating. The extended temperature range suggests the board uses rugged components, but it doesn’t necessarily include conformal coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HFXB1G1H) or specify a coated variant when ordering. The standard 1L1H is suitable for extreme temperature environments but may not resist corrosive conditions without coating.

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