Zurich Instruments Parametric feedback cooling View File Related Products HF2LI 50 MHz Lock-in Amplifier HF2LI-MF Multi-Frequency Option HF2LI-MOD AM/FM Modulation Option HF2LI-PLL Dual Phase-Locked Loop Option HF2LI-PID Quad PID Controller Option UHF-MF Multi-Frequency Option UHF-MOD AM/FM Modulation Option UHF-PID Quad PID/PLL Controller Option Back to Publications