The Zurich Instruments MFLI is a high-performance digital lock-in amplifier platform designed for precision low-noise measurements, impedance spectroscopy, and advanced signal analysis. The base system operates from DC to 500 kHz, with an optional frequency extension up to 5 MHz (MF-F5M option). It combines FPGA-based digital signal processing with a modern web-based LabOne software environment for real-time control, visualization, and automation. Key features include:

• Frequency range: DC – 500 kHz standard, expandable to 5 MHz
• Ultra-low input noise: typically 2.5 nV/√Hz above 1 kHz
• Dynamic reserve: up to 120 dB
• 16-bit, 60 MSa/s digitization for precise signal acquisition
• Sensitivity range: from 1 nV to 3 V (voltage input) and 10 fA to 10 mA (current input)
• Support for single-ended and differential measurements
• Optional multi-demodulator operation with up to 4 simultaneous demodulators and oscillators
• Integrated tools including FFT spectrum analysis, sweeper, oscilloscope, PID/PLL control, data acquisition, and impedance analysis
• High-speed interfaces via 1 GbE Ethernet and USB 2.0
• Web-based LabOne software with API support for Python, MATLAB, LabVIEW, .NET, and C
• Synchronization support via 10 MHz clock input/output and multi-device synchronization

It's manual can be found here.

The MFLI is remotely controlled through the LabOne Data Server, which communicates over Ethernet (1 GbE) or USB 2.0. Remote access can be done either via the graphical LabOne web interface or through programming APIs (Python, MATLAB, LabVIEW, C, etc.).

To check if you have remote acces to the device use:

• python3 -c “from zhinst.core import ziDAQServer; d=ziDAQServer('localhost', 8004, 6); print(d.getString('/zi/devices'))”

It should return:

"DEV30208": {
  "AVAILABLE": 1,
  "INTERFACE": "PCIe",
  "INTERFACES": "1GbE",
  "DEVICEIP": "192.168.100.17",
  "OWNER": "",
  "STATUS": "Available",
  "DEVTYPE": "MFLI",
  "STATUSFLAGS": 2

The Stanford Research Systems SR860 is a high-performance DSP lock-in amplifier designed for precision measurements of small AC signals in noisy environments. It operates over a frequency range from 1 mHz to 500 kHz and provides exceptional sensitivity down to 1 nV (voltage mode) or 1 fA (current mode), with a dynamic reserve greater than 120 dB for stable measurements even under high background noise conditions. Key features include:

• Wide frequency range: 1 mHz – 500 kHz
• Ultra-low input noise: typically 2.5 nV/√Hz above 1 kHz
• High precision phase detection with extremely low phase noise and drift
• Dual reference and harmonic detection capabilities
• Advanced digital filtering with selectable RC, Gaussian, and linear-phase filters
• Integrated FFT analysis, strip-chart recording, and high-speed data capture/streaming up to 1.25 MHz
• Differential or single-ended signal inputs and outputs
• Modern touchscreen interface with real-time visualization and data history
• Multiple communication interfaces: Ethernet, USB, RS-232, and GPIB

The manual of the SR860 also contains the commands that are accepted by the software:

• Manual

THe SR860 uses a direct Lan connection with the static ip set to 192.168.100.18. As mentioned above a list of valid commands can be found in the manual. To check if you have remote acces use the following command:

• printf “*IDN?\r\n” | nc 192.168.100.18 23

it should reply:

• SR865 Lockin Amplifier: Connection x