In modern optoelectronic systems lock-in-amplification is one of the most useful techniques to get rid of unwanted noise and to improve the measurement sensitivity. Therefore we have created a miniaturized, powerful module operating reliably even in heavy noise environments.


  • Current and voltage input

  • Working frequency up to 45 kHz

  • Adjustable sensitivity, time constant and phase

  • Local and remote control

  • Compact and EMI-shielded case


The amplifier settings - e.g. phase, gain, time constant - are controlled either by switches directly on the amplifier module or externally using a standard digital I/O computer board. The variable working frequency is determined by an external reference signal which may be e.g. the synchronization signal of a chopper wheel or the modulation signal of a laser. The current input is well suited for amplifying signals from high impedance sources like photodiodes or PMTs while the voltage input can be used to measure signals from low impedance sources like pyros or coils.


  • Spectroscopy

  • Laser stabilization

  • Luminescence, fluorescence, phosphorescence measurements

  • Light scattering measurements

  • Opto-electronical quality control

  • Integration in industrial and scientific measurement systems

  • OEM systems





True-Differential Input

Voltage Input

BNC connector


Instrumentation amplifier

Noise 12 nV/√Hz

Lemo® connector


Instrumentation amplifier

Noise 12 nV/√Hz

Current Input

BNC connector

Transimpedance amplifier, gain 1 kV/A

Noise 13 pA/√Hz

Lemo® connector

Transimpedance amplifier, gain 1 kV/A

Noise 13 pA/√Hz


(Full Scale)

Voltage: 3 µV to 100 mV, switchable in 1-3-10 steps

Current: 3 nA to 100 µA, switchable in 1-3-10 steps

Working Frequency

10 Hz - 45 kHz

Reference Input

±100 mV to ±5 V, switchable to TTL


Adjustable 0° - 360° (8-bit resolution),

Temperature drift <0,01°/K

Demodulator Dynamic Reserve

35 dB @ low drift setting, 55 dB @ high dynamic setting

Time Constants

3 ms to 10 s, switchable in 1-3-10 steps, slope switchable 6 dB or 12 dB/octave


X = in phase, ±10 V full scale, short-circuit protected

Digital Control

16 TTL, CMOS, opto-isolated

8-bit phase, 4-bit time constant, 4-bit sensitivity

Power Supply

±15 V, 100 mA typ.


170 x 60 x 30 mm (L x W x H), weight 370 g


201 kB


Power supply via 3-pin Lemo® socket. A mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet.

Block Diagram LIA-MV-150