Zurich Instruments 全新推出的 VHFLI Lock-in Amplifier 是一款數位化、多功能量測儀器，頻率範圍涵蓋 DC 至 50 MHz，搭配 VHF-F200M 選配後可擴充至 200 MHz。
VHFLI 採用業界領先的類比前端設計，延續 Zurich Instruments 過去多代產品的成熟技術與優異性能，包括整合式回授控制、多頻率同步量測、任意波形產生以及邊帶分析（Sideband Analysis）等功能。
VHFLI 優點：
- 從多個角度同步觀察訊號：同時執行 Scope（示波器）、Sweeper（頻率掃描器）、Spectrum Analyzer（頻譜分析儀）等多種分析工具。
- 建立複雜且自動化的量測流程：透過 LabOne Timeline Module 協調脈衝、觸發訊號、量測程序與控制迴路，輕鬆實現先進實驗控制。
- 快速建置高精度多通道電壓與電流量測：具備超低雜訊底限（Ultra-Low Noise Floor），適用於微弱訊號檢測。
- 擷取高速訊號變化：透過極短時間常數（Time Constant）提升量測反應速度與資料吞吐量。
- 提升操作效率：搭配 LabOne 圖形化介面（GUI）與完整 API 支援，提供直覺化操作及實驗室等級工作流程。
- 維持最佳訊號品質：採用差動輸入（Differential Inputs）設計，有效降低共模雜訊干擾。
- 進行即時訊號運算：透過內建 Arithmetic Unit，可直接對量測訊號執行數學運算。
- 兼具頂尖性能與成本效益：提供業界領先的功能與性能，同時具備極具競爭力的價格優勢。
應用領域
- 射頻（RF）與高頻電子量測
- 阻抗分析與材料特性研究
- 量子元件與量子計算研究
- 掃描探針顯微技術（SPM/AFM）
- 光電元件與光通訊測試
- 精密感測器訊號讀取
- PLL、PID 與回授控制系統開發，MEMS應用
選件:
- VHF-200M : 200MHz擴充選件
- VHF-MD： 多頻多解調選件，增加6組額外的震盪器和解調器 (共8組)
- VHF-MOD：AM/FM 調幅調頻選件
- VHF-PID/PLL：PID/PLL選件，4組獨立的PID控制器
- VHF-AWG：任意波形產生器選件，200 MHz bandwidth, 2 GSa/s
General:
| Dimensions |
32.5 × 44.5 × 10 cm (with handle); 19‑inch rack compatible |
| Weight |
6.3 kg (14 lb) |
| Power supply AC line |
100-240 V, 50/60 Hz |
| PC operating systems |
See LabOne Compatibility |
Signal inputs:
| Number of Lock-in Units |
2 |
| Channel Type |
1 Voltage (Differential and single ended) and 1 Current per Lock-in Unit |
| Frequency range |
DC - 50 MHz, DC - 200 MHz with VHF-F200M option |
| Input impedance |
50 Ω, 10 MΩ, selectable |
| Input voltage noise |
< 3 nV/√Hz (> 50 kHz) |
| Input current noise |
~ 50 fA/sqrt(Hz) @1kHz |
| Voltage Input ranges |
±5 mV to ±2 V |
| Current Input Ranges |
±10 nA to ±10 mA |
| Current Input Max Bandwidth |
50 MHz (3dB, for 10, 1 and 0.1 mA range) |
| Input AC coupling cutoff frequency |
~300 kHz (50 Ω) |
| A/D conversion |
14 bits, 2 GSa/s |
| Connectors |
BNC |
Signal outputs:
| Number of output channels |
2 |
| Output type |
Voltage, Differential and single ended |
| Frequency range |
30 MHz (0.1 dB), > 200 MHz (3 dB) |
| Output ranges |
±5 mV, ±50 mV, ±500 mV, ±5 V |
| Signal output impedance |
50 Ω |
| Signal adder |
Auxiliary input (digital adder) |
| Voltage output noise floor |
40 nV/√Hz (5V range), 4 nV/√Hz (5 mV range) |
| D/A conversion |
14 bit, 2 GSa/s |
| Connectors |
BNC |
Reference and triggers:
| Triggers |
2 inputs, 2 outputs |
| Frequency resolution |
7.1 µHz |
| Phase angle resolution |
2.7 µº |
| Trigger Connectors |
BNC front panel |
| Trigger inputs impedance |
low: 50 Ω, high: 1 kΩ |
| Trigger inputs levels |
low impedance: ±5 V, high: ±10 V |
| Trigger outputs impedance |
50 Ω, 1 kΩ |
| Trigger outputs levels |
3.3 V TTL |
Demodulators:
| Frequency range |
DC - 50 MHz, DC - 200 MHz with VHF-F200M option |
| Number of demodulators |
2 dual-phase (8 with VHF-MD option) |
| Number of oscillators |
2 (8 with VHF-MD option) |
| Output sample rate on LAN/USB 3.0 |
2 MSa/s maximum (total all demodulators)
25 MSa/s triggered mode
|
| Output sample rate on Aux outputs |
25 MSa/s, 14 bit |
| Dynamic reserve |
120 dB typical |
| Filter time constant |
14 ns to 21 s |
| Filter bandwidth |
3.2 mHz to 11 MHz |
| Filter slope |
6, 12, 18, 24 dB/Oct |
Scope:
| Input channels |
Signal inputs |
| Scope modes |
Time domain, frequency domain (FFT) |
| Number of display channels |
2 |
| Trigger mode |
Edge |
| Vertical resolution |
14 bits |
| Cursor math |
Location, area, wave, peak, tracking, histogram |
Sweeper:
| Scan parameters |
Oscillator frequency, demodulator phase shift, auxiliary offset, signal output amplitudes, signal output offset |
| 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) |
| Display options |
Single plot, dual plot (e.g. Bode plot), multi-trace |
| Statistical options |
Amplitude, spectral density, power |
Spectrum Analyzer:
| Centre frequency range |
0–50 MHz (200 MHz w/ F200M option) |
| Spectrum modes |
FFT(X+iY), FFT(R), FFT(θ), FFT((dθ/dt)/2π) |
| Statistical options |
Amplitude, spectral density, power |
| Averaging modes |
None, exponential moving average |
| Max number of samples per spectrum |
8.4 MSa |
| Max span |
1.56 MHz |
| Window functions |
Rectangular, Hann, Hamming, Blackman Harris, Flat Top, Exponential, cosine, cosine squared |
Auxiliary ports:
| Auxiliary inputs |
2 channels, ± 10 V, > 150 MHz BW
Digital adder with voltage input |
| Auxiliary outputs |
4 channels, ± 10 V > 30 MHz BW |
| Auxiliary output impedance |
50 Ω |
| Auxiliary ports amplitude |
± 10 V, ±1 V, ±100 mV (in and out) |
| Auxiliary output resolution |
0.012 mV |
| Auxiliary outputs signals |
R, Θ, X, Y, manual, options |
| Connectors |
BNC |
Connectivity and others:
| Host connection |
LAN / Ethernet, 1 Gbit/s
USB 3.0 |
| Digital I/O |
32 bits, 50 MHz |
| Clock |
10 MHz or 100 MHz input and output |
