USB Lock-In Amplifier 250D

250 kHz 2-phase Lock-In Amplifier

The unique USBLockIn250D is a compact dual input Lock-in amplifier based on highest quality digital design. Its parameters are comparable with the eLockIn203. The control via USB-Interface allows to virtually connect an infinity number of USBLockIn250D to one PC. The integrated PID control allows easy integartion into more complex setups. It can be simultaneously operated with our PCIe Lockin Amplifiers AMU5.0.

Core Features

• 2-phase digital lock-in amplification
• Noise: < 10 nV/√Hz (typ. 2.2 nV/√Hz @ 100 kHz)
• Sensitivity: 10 nV to 10 V
• Integrated PID control
• Dynamic reserve: 135 dB
• Frequency range: 0.1 Hz to 250 kHz
• Synchronous filtering over full frequency range

Inputs & Outputs

• Dual input A, A-B, A&B
• Input: Sigma-Delta ADC, 20 MSPS sampling rate
• PLL input for external triggering: sine wave > 20 mV rms or TTL
• 14-bit sine wave generator: 0.1 mV_rms to 7 V_rms
• Output amplitude accuracy: < 0.2% + 10 µV (Out to In, DC to 250 kHz)
• Two auxiliary analogue outputs, up to 1 µs group delay (250 kSPS)

Data & Acquisition

• Spectra acquisition up to 250 kHz (1 MHz internal)
• Digital results: float

Time Constants & Filtering

• Time constant (sync mode): 1 µs
• Time constants (Butterworth filter mode): 10 µs to 5 s
• Selectable roll-off: 6, 12, or 24 dB/oct

Connectivity & Software

• Remote control via USB 2.0
• User-friendly software interface
• Open-source software examples and ready-to-use UI
• Windows drivers (32/64-bit): XP, 7, 10, 11
• Remote control examples in Delphi, C, Python, Scilab, Matlab®