MFLI Lock-in Amplifier

Request Information
Zurich Instruments MFLI, lock-in amplifier, medium and low frequency lock-in amplifier, lock-in, digital lock-in amplifier, 5 MHz, 500 kHz

The Zurich Instruments MFLI is a digital lock-in amplifier that comes in two variants: the first covers the frequency range from DC to 500 kHz (upgradeable to 5 MHz), whereas the second spans frequencies from DC up to 5 MHz. Thanks to its embedded data and web servers, the MFLI can be used directly with any device running a web browser without further software installations. With its carefully developed analog and digital front ends and the fast digital processing afforded by the on-board FPGA, the MFLI combines its excellent performance with the LabOne® user interface.

EUR 5,500.00
Get Quote

MFLI Key Features

  • DC - 500 kHz / 5 MHz, 60 MSa/s, 16 bits
  • Current and differential voltage inputs
  • LabOne toolset including Scope, Sweeper, and Spectrum Analyzer
  • Plug & Play with embedded LabOne Web Server
  • USB 2.0 and 1 GbE high-speed connections
  • AC line and DC supply (battery) operation
  • Field-upgradeable options

MFLI Overview Video

MFLI Applications

  • Optical chopper applications
  • Pulsed laser applications (e.g. high power lasers)
  • Materials research
  • Quantum- and nano-electronics
  • Scanning tunneling microscopy
  • Low temperature physics
  • Four-terminal sensing
  • Seismic measurements


Are different hardware configurations available?
No, all available versions and options are firmware- and software-based and can be upgraded at any later time.
Do I need a PC to run the instrument?
The MFLI features an embedded web server, and it can thus be connected to a local network where it can be accessed from any web browser by typing in the address "http://mf-dev3XXX" (replacing 3XXX with the serial number).
How does the MFLI compare to the HF2LI and the UHFLI in terms of key features and specifications?
Please see this comparison chart.
What are the key features of the MFLI Scope tool?
The main features of the MFLI oscilloscope are:
  • Single channel, up to 16 kSa per shot, 16-bit resolution (24-bit with BW limit)
  • Sampling rates from 1.8 kSa/s to 60 MSa/s, up to 8.9 s acquisition time
  • FFT of acquired scope shots with up to 30 MHz span (limited by 10 MHz input bandwidth (-3 dB))
  • 6 signal sources including signal inputs and trigger inputs, up to 6 trigger sources and 2 trigger methods
  • Independent hold-off, hysteresis, pre-trigger and trigger level settings
  • Support for input scaling and arbitrary input units

See also the LabOne toolset and Scope pages.

What are the key features of the MFLI Spectrum Analyzer?
The main features of MFLI spectrum analyzer are:
  • Up to 58 kHz span, noise floor at 2.5 nV/√Hz, up to 8 kSa
  • Choice of 4 different FFT window functions
  • FFT input parameters: X+iY, R, Θ, f, (dΘ/dt)/(2π)

See also the LabOne Toolset and Spectrum Analyzer pages.

What are the key features of the MFLI Sweeper tool?
The main features of the MFLI Sweeper are:
  • Full-featured parametric sweep tool for signal output frequency, signal output amplitude, signal output offset, signal output phase, and offset voltage auxiliary output
  • Recording parameters: demodulator data (X, Y, R, Θ), oscillator frequency, auxiliary inputs, etc.
  • Application modes: Parameter sweep, noise amplitude measurement, frequency response analyzer, 3-omega-sweep
  • Logarithmic sweeps, automatic bandwidth adjustment, persistent display of previous scans, phase unwrap, etc.

See also the LabOne Toolset and Sweeper pages.

More Q & A

MFLI Available Options

MF-F5M Frequency Extension

This option extends the frequency range of the 500 kHz MFLI Lock-in Amplifier and of the 500 kHz MFIA Impedance Analyzer to 5 MHz. The upgrade relies on a software key and does not require any hardware change or return of the instrument; the installation can also take place at a later point in time. The upgrade is independent of the set of installed options and does not affect the other specifications.

EUR 2,700.00

Get Quote

MF-IA Impedance Analyzer Option

The Zurich Instruments MF-IA is an upgrade option for the MFLI lock-in amplifier. It provides the full digital impedance analyzer and precision LCR meter functionality that sets the new standard for impedance measurements in the frequency range from DC to 500 kHz / 5 MHz. With the MF-IA option installed impedance can be measured with 0.05% basic accuracy and a measurement range spanning from 1 mΩ to 1 TΩ. The instrument has a high measurement repeatability and a small temperature drift.

EUR 4,400.00

Get Quote


MF-PID Quad PID/PLL Controller

The MF-PID option consists of 4 configurable PID (proportional - integral - derivative) controllers. These controllers take a variety of different measurement data as the input quantity and they can provide fast feedback to a number of instrument parameters or analog output channels. Seamlessly integrated with the lock-in amplifier, the programmable PIDs enable operation in a wide range of applications such as the setup of phase-locked loops (PLLs) for the phase synchronization of two lasers, CEO stabilization and advanced AFM modes.

EUR 4,900.00

Get Quote


MF-MD Multi-Demodulator

The MF-MD Multi-Demodulator option broadens the capabilities of the MFLI and the MFIA by increasing the number of demodulators to 4 and the number of oscillators to 4. It also provides an additional external reference PLL (for a total of 2), and enables simultaneous DC offset and AC signal measurement.

EUR 4,100.00

Get Quote


MF-MOD AM/FM Modulation

The AM/FM modulation option allows generation of phase-coherent linear combinations of up to 3 oscillator frequencies. The direct measurement of (higher-order) sidebands in a variety of different modulation schemes, including amplitude modulation (AM) and frequency modulation (FM), can be conveniently set up in the LabOne® user interface.

EUR 1,400.00

Get Quote


MF-DIG Digitizer

Combining the MFLI Lock-in Amplifier or the MFIA Impedance Analyzer with a digitizer opens up a wide range of measurement opportunities thanks to continuous streaming, cross-domain triggering, and a segmented memory. The 2 Scope channels can simultaneously display signals from the differential voltage input and from the current input.

EUR 1,350.00

Get Quote


MFLI Available Bundles

MFLI 5 MHz Lock-in Amplifier

The 5 MHz version of the instrument is offered as a bundle containing the MFLI 500 kHz plus the MF-F5M Frequency Extension with a more attractive price than buying the items separately. Please note that the special pricing is offered only when the two items are purchased with a single purchase order referring to a single quotation.

EUR 8,200.00

Get Quote

Multi-Device Synchronization (MDS)

With MDS it is possible to operate multiple MFLIs as a single multi-channel device:
  • Operate all instruments from a single LabOne user interface and LabOne API.
  • Lock in phase all instrument clocks and oscillators (stable phase relationship).
  • Synchronize time stamps and sampling rates for automatic alignment of measurement data.

MFLI Functional Diagram

Front panel interface

The front panel of the MFLI features 1 current signal input, 1 differential voltage input, 1 differential signal output, 2 auxiliary inputs that can work as reference inputs, and 4 auxiliary outputs. Both signal inputs and outputs can be operated in single-ended and differential mode for experiments that require extra noise immunity. The signal ground can be referenced to the instrument ground or to the BNC shield of the signal inputs.

Voltage and current measurements

Voltage measurements and current measurements are both supported by the MFLI, but the simultaneous measurement of current and voltage requires the MF-MD Multi-Demodulator option. The analog front end features variable input impedance as well as AC/DC coupling selection, and the high-frequency analog to digital sampling provides a large oversampling factor. This ensures superior lock-in performance and high signal fidelity for the Scope.

Output channels

The results of the lock-in measurement, i.e., X, Y, R, and Θ for each of the demodulators, can be used in the following ways:

  • Analog output to any of the 4 auxiliary outputs on the front panel. Individual scaling and offsets can be set for each signal, and the 612 kSa/s sampling rate ensures that all demodulated signal components are reliably available on the physical connectors. The signal bandwidth is the same for all signals and can be as high as 200 kHz.
  • Transfer to the host PC over USB 2.0 or 1 GbE for display on the LabOne user interface, where the measurement data can be analyzed with one of several LabOne tools or stored locally.
  • Store on a USB mass storage device plugged into either of the two USB connectors.

Back panel interface

The back panel offers additional BNC connectors comprising 2 trigger inputs, 2 trigger outputs, and 1 input and 1 output for 10 MHz clock synchronization. Moreover, a SCSI connector offers access to all DIO channels. The units can be operated with standard 90 - 240 V mains supply or by an external 12 V DC power supply (e.g., an external battery pack) to break up ground loops.

Basic Specifications


Storage temperature +5°C to +65°C
Storage relative humidity < 95%, non-condensing
Operating temperature +5°C to +40°C
Operating relative humidity < 90%, non-condensing
Specification temperature +18°C to +28°C
Power consumption < 40 W
DC power inlet 12 V, 2 A
Connector: Switchcraft 760BK, ID 2.5 mm, OD 5.5 mm
Power supply AC line 100 - 240 V (±10%), 50/60 Hz
Line power fuse 250 V, 2 A, fast, 5 x 20 mm, F 2A L 250V
Dimensions including bumper 28.3 x 23.2 x 10.2 cm
11.1 x 9.1 x 4.0 inch
Rack mount on request
Weight including bumper 3.8 kg
Recommended calibration interval 2 years (see sticker on back panel)
Warranty 1 year, extensible

For the full list, please see:

MFLI and MFIA Specification


call +41 44 515 04 10
or leave us a message.

To help with your request and to comply with data protection legislation we will need to confirm that you agree for us to collect and use your personal data:

See here for details of the data that we hold on our customers and what we do with it. If you have any questions please contact