skip to Main Content
  • 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

Compact lock-in amplifier module

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.

Two Ways of Programming

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


Compact Lock-In Amplifier Modules Selector

True-Differential Input
Voltage InputBNC
Single-Ended Instrumentation-Amplifier
Noise 12 nV/√Hz
True-Differential Instrumentation-Amplifier
Noise 12 nV/√Hz
Current InputBNC
Gain 1 kV/A
Noise 13 pA/√Hz
Gain 1 kV/A
Noise 13 pA/√Hz
Sensitivity (Full Scale)Voltage: 3 μV to 100 mV, switchable in 1-3-10
Current: 3 nA to 100 μA, switchable in 1-3-10
Gain Accuracy± 2% for a Sinusoidal Input Signal
Working Frequency10 Hz - 45 kHz
Reference InputBNC, ± 100 mV to ± 5 V, switchable to TTL
PhaseAdjustable 0 - 360°
Demodulator55 dB max. Dynamic Reserve, Square Wave Mixer
Time Constants3 ms to 10 s, switchable in 1-3-10, Slope switchable 6 dB or 12 dB/Octave
OutputBNC, X (in phase), ± 10 V Full Scale, short-circuit protected
Control Interface16 Opto-Isolated Digital Inputs, TTL/CMOS Compatible, 8 Bit Phase, 4 Bit Time Constant, 4 Bit Sensitivity
Interface Software OptionLUCI-10 Control Interface Software and Hardware option
Power Supply± 15 V, +100 mA/V -60mA typ.
Case170 x 60 x 30 mm (L x W x H), Weight 370 g (0.82 lbs)
LED overload and unlocked indication. Power supply via 3-pin LEMO socket. A mating connector is provided with the device.  Optional power supply PS-15 is available. For further information please view the datasheet.
Block Diagram LIA-MV

FEMTO Product Catalog

Return to selector

Back To Top