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Anfatec's lockin amplifiers use a unique DSP technology which is only found in these instruments.
High speed real-time data processing is combined with optimized analogue input stages.
Fully digitally designed high quality filtering ensures an excellent suppression of background signals and an unsurpassed dynamic reserve.

USB Lock-in Amplifier

10 mHz to 250 kHz

USB Lock-In 250

135 dB Dynamic Reserve

Integrated PID Control

1 µs Time Constant

Multi Lock-In Amplifier

10 mHz to 250 kHz

Multi Lockin

up to 7 USB Lock-In in one

Differential & Dingle Input

3 HE 19" Housing Lock-In

Comparison Table of all Anfatec Lock-In Models

Printversion
Print
AMU 2.4 AMU 5.0 eLockIn203 eLockIn204/2 eLockIn205/2 USB Lockin
Inputs Single Input Dual input
A, A-B, A&B
Single Input
typ. Noise @ 10 kHz and 100 kHz 8 nV / √Hz 2.5 nV / √Hz 2.5 nV / √Hz 3.5 nV / √Hz 4 nV / √Hz 4 nV / √Hz
Interface PCI PCIe Ethernet / USB USB
Calibrated Frequency Range 3 mHz to 1 MHz 3 mHz to 2 MHz 10 mHz to 250 kHz 10 mHz to 1 MHz 30 mHz to 10 MHz 10 mHz to 250 kHz
Time Constants 100 µs - 5 s 200 µs - 5 s 200 µs - 1 ks 200 µs - 1 ks 0.1 µs -1 ks 10 µs - 5 s
in Sync-Mode 1 - 200 cycles 1 - 200 cycles 1 µs / 1 - 200 cycles 0.1 µs / 1 - 200 cycles 1 µs
Aux Out - 8 channels
156 kHz
24 bit
8 channels
1 MHz
18 bit
2 channels
250 kHz
18 bit
Spectrum Acquisition mHz to 4 MHz mHz to 250 kHz mHz to 2 MHz mHz to 20 MHz mHz to 1 MHz
External Trigger TTL Sine > 50 mVrms,TTL Sine Wave > 50 mVrms, TTL Sine Wave > 50mVrms, TTL
Optional I/U converter - - Yes Yes - -
Input impedance 100 kΩ || 15 pF 1 MΩ || 15 pF 1 MΩ || 15 pF 1 MΩ || 15 pF 1 MΩ || 15 pF 1 MΩ || 20 pF
List Price 1550 € 1860 € 5030 € 6900 € 9180 € 2670 €

Lockin amplifiers are instruments designed to recover signals that are buried in noise. They require a reference signal at the same frequency as the signal that is being measured and then use this to demodulate the input signal before filtering.Scitec produces a range of lock-in amplifiers to meet different requirements. We also offer a DSP based lock-in amplifier
A lock-in amplifier is a type of amplifier that can extract a signal with a known carrier wave from an extremely noisy environment. Depending on the dynamic reserve of the instrument, signals up to 1 million times smaller than noise components, potentially fairly close by in frequency, can still be reliably detected. It is essentially a homodyne detector followed by low-pass filter that is often adjustable in cut-off frequency and filter order. Whereas traditional lock-in amplifiers use analog frequency mixers and RC filters for the demodulation, state-of-the-art instruments have both steps implemented by fast digital signal processing, for example, on an FPGA. Usually sine and cosine demodulation is performed simultaneously, which is sometimes also referred to as dual-phase demodulation. This allows the extraction of the in-phase and the quadrature component that can then be transferred into polar coordinates, i.e. amplitude and phase, or further processed as real and imaginary part of a complex number (e.g. for complex FFT analysis).

More information about Lock-In Amplifier Theory