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瑞士苏黎世仪器 (Zurich Instruments) 的 HF2LI锁相放大器（高频，双通道）是可以测量从直流到 50 MHz 频率范围的数字锁相放大器。它具备双输入通道，可以替代许多需要用到2 台单通道锁相放大器的情况。128 位的数字信号处理提供卓越的精确度，因而提高噪声性能和动态储备。通过这些前所未有的功能，HF2LI 把锁相放大器提高到了新的水平，并能够应用到频率要求更高的更多的场合，以前模拟仪器的频率范围受到了极大的限制。高速数据采集可通过高速 USB 连接计算机来实现。HF2LI 具有强大的图形用户界面和多种编程接口，使用非常方便。
With multi-device synchronization (MDS) it is possible to operate multiple HF2LIs as a single multi-channel device:
HF2LI 的 双输入通道经优化设计达到超低噪声水平。高达模拟输入带宽 4 倍的210 MSa/s 采样率充分保证信号的完全捕获信号并避免混叠。
HF2LI 的2路高频输出来源于最多6 个 直流到 50 MHz 的正弦波线性组合。当启用 HF2LI-MF 多频选件时，即可以为每个正弦波分量设置振幅、频率和相移。
HF2LI 提供 6 个双相解调器。每个解调器都可通过自带的滤波器做独立设置，包括从 1 μs 到 500 s 的时间常数（相当于 80 μHz 到 200 kHz的解调信号带宽）和1 到 8 阶滤波器。滤波器基于先进的128 位数字架构。相对普通模拟仪器来说，优势是具备更高的动态储备、零点漂移、精确相移和正交性。
2048 点存储深度的集成示波器提供直观的输入信号时域和频域视图。用户可以随时看到输入的和生成的信号，由此可迅速找到正确的设置。频率响应分析仪可提供精确的频响图。FFT 频谱分析仪可提供由锁相放大器解调出的高分辨率频谱图。
| 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), with HF2LI-MF |
| Arbitrary frequency mode | 6 frequencies, with HF2LI-MF |
| 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 bits, 210 MSa/s |
| 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 bits, 210 MSa/s |
| 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 bits |
| Maximum number of samples per shot | 2048 |
| Bandwidth limit mode, vertical resolution increase | Sample decimation, averaging |
| Cursor math | Location, area, wave, peak, tracking, histogram |
| Center frequency range | 0 - 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, logarithmic |
| Parameter sweep resolution | Arbitrary, defined by start/stop value, 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 |
| High-speed outputs | 4 channels, ±10 V, amplitude, phase, frequency, X/Y, or user-defined |
| D/A converter | 16 bits, 1 MSa/s |
| D/A analog bandwidth | 200 kHz |
| High-speed inputs | 2 channels, ±10 V |
| A/D converter | 16 bits, 400 kSa/s |
| A/D analog bandwidth | 100 kHz |
| Host connection | USB 2.0, 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 bits, 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 m |
| Internal oscillator output | Sine, ±1 V, 10 MHz |
| Internal oscillator initial accuracy | ±1.5 ppm |
| Internal oscillator temperature coefficient | 0.05 ppm/C |
