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HF2LI Lock-in Amplifier0 pages
HF2LI
Lock-in Amplifier
Zurich
Instruments
2 Input Channel, 2 Generator,
50 MHz Lock-in Amplifier
Product Specification
Release date: August 2014
Key Features
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210 MSa/s, 0.7 μHz - 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
Frequency response analyzer, FFT spectrum analyzer and oscilloscope
Graphical user interface and programming interfaces included
Summary
The Zurich Instruments HF2LI (high-frequency, 2 inputs)
is a digital lock-in amplifier covering the frequency range
between 0.7 μHz 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.
Hardware
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.
