L3 – Elapsed Time Indicators

Elapsed Time Indicators & Event Counters

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Elapsed Time Indicators by L3 Electrodynamics – Precision That Defines Reliability

In the world of defense-grade power and control systems, time is not just a parameter — it’s a mission-critical measurement.
The Elapsed Time Indicators (ETI) by L3 Electrodynamics, distributed in Israel by Amironic Ltd, are designed to record every operational second with absolute accuracy, durability, and compliance to MIL-SPEC standards such as MIL-PRF-83287, MIL-PRF-39019, and MIL-STD-202.

Used in airborne, naval, and ground platforms, these military-qualified solid-state hour meters and event counters provide verifiable runtime data essential for maintenance, readiness, and life-cycle management — whether in an aircraft mission computer, a radar transmitter, or an armored vehicle’s power module.

⚙️ What Is an Elapsed Time Indicator (ETI)?

An Elapsed Time Indicator (also known as a solid-state hour meter or maintenance timer) is a device that measures and records the cumulative operating time of a system or component.
Unlike a simple counter, an ETI is engineered for continuous, high-reliability operation in harsh environments — capable of enduring vibration, shock, EMI, and salt-spray conditions per MIL-STD-202 Method 101.

Each L3 ETI functions as an independent time base, driven by quartz-controlled or electronic pulse logic, ensuring precise accumulation of total on-time even under variable input voltage or environmental extremes.

🧭 Military-Grade Design and Construction

L3 Electrodynamics designs its ETI family for DoD-certified defense systems, combining electromechanical reliability with solid-state precision.
Models such as the L3 ETI 1170-004 or L3 SSETI feature sealed housings, corrosion-resistant terminals, and robust panel-mount or PCB configurations.

Key Design Features:

Operating range: 5 to 250 V AC/DC
Display: mechanical odometer, LED, or LCD readout
Accuracy: ±0.02 % over full scale
Sealing: IP65 front panel, conformal-coated electronics
NVIS and Non-Glare glass for night-vision compatibility
Shock & Vibration: 15 g per MIL-STD-810, random vibration tested
Temperature: −55 °C to +85 °C
Reset options: electrical or manual, lockable per spec requirement

These solid-state hour meters employ non-volatile memory ensuring data retention after power loss — ideal for flight-line diagnostics, ground vehicle service logs, or remote telemetry systems.

🔩 Integration Across Defense and Industrial Platforms

Because runtime tracking is fundamental to predictive maintenance, the L3 ETI product line integrates seamlessly with existing BITE (Built-In Test Equipment) and RS-232-based PCB monitoring systems.

Typical integration scenarios include:

Aerospace and UAV systems – monitoring avionics and propulsion modules
Naval platforms – runtime logging of pumps, compressors, and weapon control units
Ground vehicles – cumulative hours for hybrid-drive engines or auxiliary systems
Energy & radar stations – mission duration and transmitter operation time
Test benches and calibration setups – accurate cycle and duty tracking

Amironic’s engineering team provides cross-reference support for legacy mechanical hour meters, replacing them with L3 solid-state counters compatible with MIL-PRF-39019 and AS9100 environments.

⚙️ Why Choose L3 Electrodynamics ETIs

Proven MIL-SPEC performance – fully qualified under MIL-PRF-83287 and MIL-STD-810 environmental standards.
Long-life solid-state design – maintenance-free operation exceeding 100,000 hours MTBF.
Versatile mounting – panel, rear, or PCB versions for embedded use.
Integration flexibility – digital outputs for RS-232 or CAN monitoring.
Custom configurations – labeling, voltage scaling, or non-resettable hour metering per OEM spec.
Full traceability – each unit serialized and tested per DoD QA procedures.

These instruments are not simple time counters — they are mission assurance tools.
By logging the precise runtime of a power converter, gimbal, radar transmitter, or avionics bay, engineers can correlate real-time wear with preventive maintenance schedules, dramatically reducing unplanned downtime.

🛡 Compliance and Qualification

All L3 Electrodynamics Elapsed Time Indicators meet or exceed the following specifications:

MIL-PRF-83287 – performance and reliability standard for elapsed time meters
MIL-PRF-39019 – mechanical and electrical qualification for hour counters
MIL-STD-202 – environmental and salt-spray endurance testing
MIL-STD-810 – shock, vibration, and thermal stress
RTCA DO-160 – airborne electronic equipment standard
UL 60601-1 / IEC 61010 – optional certification for industrial and medical control

💡 The Amironic Advantage

As the authorized L3 Electrodynamics distributor in Israel, Amironic provides full engineering and commercial support — from technical selection to procurement and integration.
Our team specializes in military hour meters, event counters, and BITE monitoring solutions for the defense, aerospace, and industrial sectors.

Amironic’s added value lies in local availability, fast logistics, and direct communication with L3’s engineering teams, ensuring reliable delivery and continuous compliance documentation (CoC, test reports, and MIL-STD certificates).