DS3800NGRA1L1D | OEM GE Speedtronic General Purpose Remote

Description

Product Introduction

The DS3800NGRA1L1D is the dual-radiation-hardened version of the general-purpose remote adapter—the NGRA built for installations where both neutron and gamma radiation are significant threats. The suffix tells the story: the first “1” indicates a hardware revision with improved signal conditioning. The “L” specifies combined neutron + gamma hardening: 10^13 n/cm² neutron fluence tolerance and 1 Mrad gamma total dose, with neutron-absorbing shielding and radiation-hardened components. The second “1” adds enhanced diagnostic features. The final “D” is the military-grade environmental package: triple-layer conformal coating, hermetically sealed components, and MIL-STD-810G shock/vibration tolerance. This board was designed for the most extreme mixed-radiation environments—nuclear reactors with significant gamma background, research facilities, and nuclear-powered vessels.

The combined neutron + gamma hardening ensures the board survives in environments where both types of radiation are present. The triple-layer coating and MIL-STD-810G rating protect against humidity, salt spray, shock, and vibration. Compare this to the NGRA1J1D (neutron-hardened only, 100 krad gamma) or the NGRA1H1D (gamma/heavy ion hardened, no neutron hardening). The 1L1D provides the broadest radiation protection available in the NGRA line.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

What’s the difference between the NGRA1L1D and the NGRA1J1D?
The 1L1D adds gamma hardening to 1 Mrad (the 1J1D has 100 krad gamma tolerance) and a gamma radiation event LED. The neutron hardening is the same on both boards (10^13 n/cm²). The 1L1D is for mixed neutron + gamma environments; the 1J1D is for neutron-rich, low-gamma environments.

What’s the difference between the NGRA1L1D and the NGRA1H1D?
The 1L1D is optimized for neutron radiation with significant gamma background—10^13 n/cm² neutron tolerance and 1 Mrad gamma. The 1H1D is optimized for gamma and heavy ions (deep-space) with 10 Mrad gamma and heavy ion tolerance, but no neutron hardening. The 1L1D is for reactor environments; the 1H1D is for space environments.

What’s the gamma event LED?
The Gamma Event LED indicates that the board has detected a significant gamma radiation event. The board logs gamma events and can recover from gamma-induced single-event effects. This is a feature of the “L” suffix—the “J” variant doesn’t have gamma event logging.

What’s the radiation tolerance of this board?
The board is rated for 10^13 n/cm² fast neutron fluence and 1 Mrad gamma total dose. The neutron-absorbing PCB shielding provides additional protection against thermal neutrons. The board includes MIL-STD-461G EMP protection.

Do I need to upgrade my DMP firmware for the enhanced diagnostics?
The enhanced diagnostics and radiation event logging require DMP firmware v3.0 or later. We can provide the firmware EPROMs if you need them.

How is the NGRA configured?
The NGRA is configured via jumpers on the board or through firmware settings. If you’re replacing a failed NGRA, photograph the jumper settings before removing the old board.

Can I hot-swap this board?
No. Mark IV backplanes are not hot-swappable. Power down the cabinet, lock out the breaker, and wait 60 seconds before removing or installing the board.

What’s your warranty and lead time?
We stock the NGRA1L1D in limited quantities. Lead time is 2-3 business days. We offer a 2-year warranty. We test every board with a 48-hour burn-in, a thermal cycle (-55°C to +85°C), and a full diagnostic verification. The test report is included.

Is this board compatible with the Mark VIe?
No. This board is for Mark IV systems only. The backplane architecture is different.

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