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====== Lock-In Amplifiers ======
===== MFLI Zurich Instrument =====
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 {{ :setup:lock_in:zimfli_usermanual.pdf |here}}.

==== Remote access ====
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
===== SRS SR860 =====
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:
  * {{ :setup:lock_in:sr860m.pdf |Manual}}

==== Remote access ====
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

===== EG&G 72xx =====
The Signal Recovery 7260 and 7280 DSP Lock-in Amplifiers are high-performance digital lock-in amplifiers designed for precision AC signal recovery and phase-sensitive measurements in noisy laboratory environments. Both systems use advanced DSP technology to provide high sensitivity, low phase noise, flexible operating modes, and extensive automation capabilities for scientific and industrial measurements. The 7260 supports measurements up to 250 kHz, while the 7280 extends the operating range up to 2 MHz for wide-bandwidth applications.
Key features include:

  * Frequency range: up to 250 kHz (7260) and 2 MHz (7280)
  * Voltage sensitivity: down to the nanovolt range
  * Current sensitivity: down to the femtoampere range
  * Dual-phase demodulation with simultaneous X/Y and R/θ outputs
  * Dual reference and dual harmonic modes for simultaneous multi-frequency measurements
  * Virtual reference mode for reference-free signal detection
  * Integrated frequency and amplitude sweep generation
  * Low phase noise and high dynamic reserve for stable measurements under noisy conditions
  * Selectable digital filtering and programmable output time constants
  * Integrated noise measurement and spectral display functions
  * Auxiliary ADC/DAC channels and programmable digital I/O
  * Internal curve storage and graphical visualization capabilities
  * Remote control via RS232 and IEEE-488 (GPIB) interfaces

There manuals can be found here:
  * {{ :setup:lock_in:190163-a-mnl-d.pdf |7260}}
  * {{ :setup:lock_in:190398-a-mnl-d_1_.pdf |7280}}

==== Remote access ====
Both the 7280 and 7260 allow for daysi chaining. The 7260 is daisychained to the 7280 and the 7280 uses a startech RS-232 to Land adapter with the following properties:
  * Data Format on StarTech adapter: 9600-8N-1-N
  * 7280 Settings: Baud Rate 9600; Data Bits 8+0 parity; Parity none, Adress 0; Echo Off; Prompt Off; Delimiter cr(ASCII 13) 

The 7260 uses the following properties
  * Baud Rate 9600; Data Bits 8+ no parity; Delimiter cr(013); Adress 1; Echo Off; Parity odd; Prompt Off

Use the following command to test communication with the 72xx:
  * printf '\\N **0**\rID\r' | nc 192.168.100.19 4001

it should reply:
  * 7280

The bold number represents the adress number given in the RS-232 communication setting.
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