HF2LI Lock-in Amplifier

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Zurich Instruments HF2LI, lock-in amplifier, high frequency lock-in amplifier, lock-in, digital lock-in amplifier, 50 MHz

The Zurich Instruments HF2LI (high-frequency, 2 inputs) is a digital lock-in amplifier covering the frequency range between DC and 50 MHz. It features 2 physical input channels so that it can replace 2 devices in many measurement setups. The 128-bit digital signal processing delivers superior precision thus boosting both the noise performance and the dynamic reserve. With these unprecedented capabilities, the HF2LI brings lock-in amplification to a new level and enables new applications in a frequency range that was previously tied to analog instrumentation. The computer is connected by a high-speed USB interface, which allows data acquisition at high rates. The HF2LI is delivered with a fully featured graphical user interface and a choice of programming interfaces that greatly add to the usability of the instrument.

HF2LI Key Features

  • 210 MSa/s, DC - 50 MHz operation
  • 2 independent lock-in units, 2 signal generators
  • 1 fundamental and 2 harmonics per lock-in unit
  • 4 auxiliary outputs, 2 auxiliary inputs
  • USB 2.0 high-speed, 480 Mbit/s
  • LabOne® toolset: Scope, Sweeper, Spectrum Analyzer, etc.

HF2LI Overview Video

HF2LI Applications

  • Atomic Force Microscopy (AFM), Scanning Probe Microscopy (SPM)
  • Non-linear imaging (CARS, SRS, Terahertz, etc.)
  • Sensors & Actuators, MEMS, e.g. gyroscopes and accelerometers
  • Laser Spectroscopy
  • Sensors & Actuators (MEMS)
  • Astronomy
  • Nondestructive Testing (NDT)
  • Med-tech, Radiology and Ultrasound
  • Industrial processing

HF2LI Available Options

HF2LI-MF Multi-frequency

The HF2LI-MF multi-frequency option impressively extends the capability of the HF2LI lock-in amplifier by adding a wide range of configuration alternatives. This largely improves the flexibility of the instrument and enlarges the research horizon of scientists.

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HF2LI-MOD AM/FM Modulation

The HF2LI-MOD is an option for the HF2LI and allows for the direct analysis of sidebands in dynamic AM (amplitude modulation) and FM (frequency modulation) schemes. This option helps the user to precisely measure periodic variations in the frequency or the amplitude of the application signal. Such schemes are typically applied in oscillator and resonator related setups.

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HF2LI-PLL Dual Phase-locked Loop

The HF2LI-PLL is an option for the HF2LI and essentially provides a dual programmable digital phase-locked loop which enables fast frequency tracking. Zurich Instruments offers the world's fastest digital PLL, with a unique frequency range of up to 50 MHz using direct sampling technology. In combination with the multi-frequency and the AM/FM modulation options, the HF2LI can be considered as a ground breaking measurement tool for all advanced oscillation applications.

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HF2LI-PID Quad PID Controller

The HF2LI-PID option builds on the HF2LI and seamlessly integrates no less than 4 high performance PID (proportional integral derivative) controllers for general purpose control. The controllers provide the means to efficiently implement closed loop control on several measured physical units.

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HF2TA Current Amplifier

The HF2TA current amplifier converts 2 input currents into voltage output in a wide frequency range up to 50 MHz. This device is an active probe which can be conveniently placed close to the measurement setup. It supports most applications where a current must be converted to a voltage. The dedicated design of the HF2TA ensures stability and a smooth operation over the entire frequency range.

EUR 2,500.00

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HF2LI Instrument Calibration

HF2LI-CAL includes

  • Instrument calibration valid for another 2 years
  • Full calibration report
  • 2 weeks turnaround
  • 20% discount on all non-warranty repairs
  • 6 months warranty extension (within 7 years)
  • World-wide return shipping


EUR 700.00

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HF2LI Functional Diagram

The HF2LI combines the latest analog front-end circuits, for signal sampling, and high-performance digital signal processors.

High-Precision Inputs

The 2 input paths of the HF2LI are optimized for very low noise operation. The sampling rate of 210 MSa/s is 4-times the analog bandwidth to ensure full capture of the signal and to avoid aliasing.

Signal Outputs

The HF2LI generates 2 high-frequency outputs as a linear combination of up to 6 sinusoids in the range from DC to 50 MHz. The amplitude, frequency, and the phase shift can be set for each component when the HF2LI-MF Multi-frequency option is enabled.

Demodulators and Filters

The HF2LI provides 6 dual-phase demodulators. Each demodulator can be configured with its own filter properties including time constant from 1 μs to 500 s (corresponding to signal bandwidths from 80 μHz to 200 kHz) and filter order from 1st to 8th. The filters are implemented in advanced 128-bit digital architecture. The advantages over common analog instruments are higher dynamic reserve, zero drift, precise phase shifts, and orthogonality.

Integrated Toolset

An integrated oscilloscope with memory for 2048 samples provides direct signal-vs-time and spectral views of the input signal. Users obtain an overview of the incoming and generated signals at any time to quickly find the right settings. A frequency response analyzer provides precise signal-vs-frequency plots. The FFT spectrum analyzer delivers a high-resolution spectral view of the signals demodulated by the lock-in amplifier.

HF2LI Specifications

Lock-in Operating Modes
internal reference mode single and dual lock-in
external reference mode single and dual lock-in
auto reference mode single and dual lock-in
dual-harmonic mode 1 fundamental + 2 harmonics (simultaneous)
multi-harmonic mode 1 fundamental + 5 harmonics (simultaneous), requires HF2LI-MF
arbitrary frequency mode 6 frequencies, requires HF2LI-MF
HF Analog Input
frequency range DC - 50 MHz
input impedance 50 Ω or 1 MΩ || 20 pF
input noise voltage 5 nV/√Hz (above 10 kHz)
dynamic reserve 120 dB
input range ±3.3 V
input AC range ±1.5 V (with DC coupling)
input full range sensitivity 1 nV to 1.5 V
A/D conversion 14 bit, 210 MSa/s
HF Analog Output
frequency range DC - 50 MHz
output ranges ±10 mV, ±100 mV, ±1 V, ±10 V
signal adder ±10 V, DC to 50 MHz bandwidth
D/A conversion 16 bit, 210 MSa/s
Demodulator & Reference
number of demodulators 6 dual-phase
output sample rate on USB: up to 460 kSa/s
on Auxiliary outputs: 1 MSa/s
filter time constant 1 µs - 500 s
filter bandwidth 80 µHz - 220 kHz
filter slope 6, 12, 18, 24, 30, 36, 42, 48 dB/Oct
X, Y, R, Theta 64-bit full range
reference frequency resolution 0.7 µHz
reference phase angle resolution 1.0 µ°
Input channels Signal Inputs, Signal Outputs
Scope modes Time domain, frequency domain (FFT)
Number of display channels 1
Trigger channels Signal Inputs, Signal Outputs, Oscillator Phases, DIOs
Trigger modes Edge
Sampling rates 6.4 kSa/s to 210 Msa/s
Vertical resolution 14 bit
Maximum number of samples per shot 2048
Bandwidth limit mode, vertical resolution increase sample decimation, averaging
Cursor math Location, Area, Wave, Peak, Tracking, Histogram
Spectrum Analyzer
Center frequency range 0 to 50 MHz
Spectrum modes FFT(X+iY), FFT(R), FFT(Θ), FFT(f) and FFT((dΘ/dt)/2π)
Statistical options Amplitude, Spectral density, Power
Averaging modes None, Exponential moving average
Maximum number of samples per spectrum 8.4 MSa
Maximum span 460 kHz
Window functions Rectangular, Hann, Hamming, Blackman Harris
Cursor math Location, Area, Wave, Peak, Tracking, Histogram
Scan parameters Oscillator frequency, Demodulator phase shift, Auxiliary Offset, Signal Output Amplitudes, etc.
Parameter sweep ranges Full range, Linear and Logarithmic
Parameter sweep resolution Arbitrary, defined by start/stop value and number of sweep points
Display parameters Demodulator Output (X, Y, R, Θ, f), Auxiliary Input
Display options Single Plot, Dual Plot (e.g. Bode Plot), Multi-trace
Statistical options Amplitude, Spectral density, Power
Preset measurement modes Parameter sweep, Noise amplitude measurement, Frequency response analyzer, 3-Omega-Sweep
Auxiliary Signals
high-speed outputs 4 channels, ±10 V, amplitude, phase, frequency, X/Y, or user defined
D/A converter 16 bit, 1 MSa/s
D/A analog bandwidth 200 kHz
high-speed inputs 2 channels, ±10 V
A/D converter 16 bit, 400 kSa/s
A/D analog bandwidth 100 kHz
Other Interfaces
host connection USB 2.0 high-speed, 480 Mbit/s
pre-amplifier control bus ZCtrl proprietary bus to control external pre-amplifiers
synchronization bus ZSync proprietary bus to locally interconnect ZI instruments
digital I/O 32 bit, general purpose
dimensions 45 x 35 x 10 cm (19" rack)
weight 6.2 kg
power supply 110-120 V, 220-240 V, 50/60 Hz
operating temperature +5 °C to +40 °C
operating environment IEC61010, indoor location, installation category II, pollution degree 2
operating altitude up to 2000 meters
internal oscillator output sine, ±1 V, 10 MHz
internal oscillator initial accuracy ±1.5 ppm
internal oscillator temperature coefficient 0.05 ppm/C

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