SSI Multi-channel Lock-in Amplifier

Parameters per lock-in unit

Signal channels
        Voltage input mode                Single-ended or differential input
        Full-scale sensitivity                1 nV to 5 V, in 1-2-5 sequence steps
        Current input gain                106  V/A
        Input impedance
                Voltage                          10 MΩ//10 pF, AC or DC coupling
                Current                          1 kΩ to virtual ground
        Common-mode rejection ratio                     >70 dB to 10 kHz, decreasing at 6 dB/oct
        Dynamic reserve                         >120 dB
        Gain accuracy                         Standard 0.5%, max 2%
        Voltage noise
                at 997 Hz                5 nV/√ Hz

Reference channel
        Input
                Frequency range                 1 uHz to 100 or 500 kHz
                Reference input                 Square wave or sine wave
                Input impedance                 10 MΩ
                Square-wave reference level         VIH>3V，VIL<0.5V
                Sine reference signal         >2 Hz
                                             >400 mVpp
        Phase
                Resolution                     1 udeg
                Absolute Phase Error        < 1 deg

                Relative phase error        <0.001 deg

                Orthogonality
                        Internal reference         At 1 kHz: <0.0001° rms
                        External reference         At 1 kHz: 0.005° rms (time constant 100 ms, 12 dB/oct)
                Temperature drift
                        Below 10 kHz      <0.01°/℃
                        Above 10 kHz      <0.1°/℃

        Harmonic detection                           2F, 3F, …nF up to 100/500  kHz (n<65,535)

        Acquisition time

                Internal reference                  Real-time acquisition

                External reference                (3 cycles + 5 ms) or 40 ms

Demodulator

        Stability

                Digital Output                 No zero drift for all settings

                Display                        No zero drift for all settings

                Analog output                 All dynamic reserve settings less than 5 ppm/℃

        Harmonic suppression                         -90 dB

        Time constant                        1 us to 3 ks . 6, 12, 18, 24, 30, 36, 42, 48 dB/oct steep roll-off

        Synchronous filter                     Effective below 1 kHz and above 18 dB/oct steep roll-off

Signal generator

        Frequency

                Range                          1 uHz to 100 or 500 kHz

                Accuracy                          2 ppm+10 uHz

                Resolution                      1 uHz

        Distortion                                  -70 dBc 

        Sine Amplitude                         0.001 Vrms to 5 Vrms (resolution 1 mVrms)

                Error                          Standard 0.5% (f<10 kHz), max 2%

                Temperature stability             100 ppm/℃

        Sine output                         Sine signal, output impedance 50 Ω

        TTL sync output                  5 V TTL/CMOS level, output impedance 200 Ω

Auxiliary inputs and outputs

        CH 1 and CH 2

                Function                          Outputs X, Y, R, θ and harmonics

                Amplitude                          ±10 V

                Drive current                 ±30 mA max

        AUX Inputs

                Function                          2-channel input

                Amplitude                          ±10 V, 1 mV resolution

                Impedance                          1 MΩ

                           Multi-channel system parameters

Communication interface

        RS-232                             Standard 9-pin RS-232 female connector

        USB2.0                            USB 2.0 high-speed communication interface

        Enternet                          1 Gbps Gigabit Ethernet communication interface

Others

      Power requirements

              Voltage                    220~240 VAC (110~120 VAC optional)

              Frequency                    50 Hz / 60 Hz

              Power                    50 W to 200 W (power increases with the number of channels)

              Power supply noise rejection      70 dB@1 MHz