Super User Specifications Signal chain Phase sensitive detection using microprocessor controlled lock-in amplifier with digital dual phase oscillator and differential electrometer input. Lock-in amplifier Software controllable gain range. Gain 1-105. Maximum theoretical sensitivity 0.5 µV FSD. Output time constant 0.1, 1, 10 s. Differential electrometer 1015 Ohms input impedance. Decade gain ranges 0 to 80 dB. Common mode range ±12 V. Vibration actuator: One dimensional low voltage piezo-electric actuator. Vibration amplitude (±10%): Software set from 0 – 30 µm perpendicular to sample surface. Backing potential controller Potential range ±10 V DAC resolution 300 μV. Sampling 0.1 to 1000 Hz. Type PID Controller Probe type: SKPR Tungsten air gap. Electrochemical sensitivity: Better than 0.15 meV. Positioning system specifications Stepper Motors Scan Range (x,y,z): 110 mm x 110 mm x 110 mm Minimal step size on all axes: 20 nm Closed loop positioning linear zero hysteresis encoder with direct real-time readout of displacement in x, y and z Linear position encoder resolution: 20 nm. Max. scan speed: 10 mm/s Measurement resolution: 32-bit decoder @ up to 40 MHz Piezoelectric element (for z axis only) Vibration range 20 nm – 2 µm peak to peak with 1 nm increments Min. vibration resolution: 0.12 nm calculated (16-bit DAC on 4 µm) Piezo crystal extension: 100 µm Positioning resolution: 0.09 nm calculated (20-bit DAC on 100 µm)
