ILX Lightwave LDX-3207B: Precision Current Source, 200 mA, LDX-3220 Series

The ILX Lightwave LDX-3207B is a precision current source engineered for laser diode applications within the LDX-3220 Series. It delivers user-adjustable output current from 0 to 200 mA with independent current limit control, accommodating the stringent requirements of research, development, and production environments. Three selectable output modes - constant power, constant current, and high bandwidth current - provide operational flexibility for diverse laser control scenarios.

Modulation capability via BNC input extends to 100 kHz with 100 mA/V gain, enabling dynamic current control. The instrument combines low-noise output (<0.1 µA RMS) with exceptional stability (±0.01% of setting + 0.1 µA per hour) and current accuracy of ±(0.1% of setting + 1 µA), delivering 1 µA resolution across the full range. Integrated laser protection mechanisms guard against transients and overloads, while audible indicators signal current limit and open circuit conditions.

Compliance voltage reaches 5 V.

Technical Specifications

• Output Current: 0–200 mA, user-adjustable


• Current Limit: 0–200 mA, user-adjustable


• Current Resolution: 1 µA


• Current Accuracy: ±(0.1% of setting + 1 µA)


• Output Ripple and Noise: <0.1 µA RMS


• Stability: ±(0.01% of setting + 0.1 µA) per hour


• Compliance Voltage: 5 V


• Modulation Input: BNC connector, DC to 100 kHz, 100 mA/V gain


• Modulation Bandwidth (3 dB): DC to 100 kHz at 50 mA P-P output


• Display: 3-1/2 digit LED


• Dimensions: 4.00 in (H) × 8.00 in (W) × 13.00 in (L)


• Weight: 7.00 lbs


• Input Power: 100–240 VAC, 50/60 Hz (jumper selectable)

Key Features

• Three output modes: Constant Power, Constant Current, High Bandwidth Current


• Fine/coarse parameter adjustment knob for precision control


• Output connectors: Binding posts, isolated from chassis ground


• Optional GPIB interface for remote control and programming


• Audible alert: 1-second repeating tone at current limit; 3-second tone for open circuit


• Integrated laser diode protection against transients and overloads

Typical Applications

• Precision laser diode biasing and modulation


• High-stability current sourcing for photonics research


• Dynamic current control in production test environments

Compatibility & Integration Part of the ILX Lightwave LDX-3220 Series. Optional GPIB interface enables integration with automated test systems.