OE1201 Lock-in Amplifier
120kHz Small-sized Lock-in Amplifier
50mHz to 120kHz frequency
Low-noise current and voltage inputs
1 nV to 1 V full-scale sensitivity
1us to 3ks time constants
>120 dB dynamic reserve
Small size, Easy integration
Command compatible with SR830

Performance parameter
Application Area
Software Interface
Optional Accessory
Data download
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Input Channel

    OE1201 detects an input signal in a single-ended mode or a differential voltage mode. With an ultra low-noise pre-amplifier, the input noise is as low as 9 nV/√Hz@997 Hz. The input impedance is 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1 V. Besides, OE1201 can be used for current measurement with gains of 10^6 or 10^8 V/A. Two line filters (50/60 Hz and 100/120 Hz) are designed to eliminate power frequency interference. A programmable gain amplifier is used to adjust the dynamic reserve of the system, so that OE1201 can keep a high dynamic reserve of 120 dB. 

Reference Channel

    The reference signal can work in external mode or internal mode. In internal mode, a precise and stable internal oscillator generates sine wave as an internal reference that is multiplied by the input signal. This internal signal is without any phase noise. With the digital phase-shifting technique, the phase resolution of the reference signal is 0.01 deg. OE1201 can work at any fixed frequency from 50 mHz to 120 kHz in this mode. In external mode, the reference signal can be a sine wave or a TTL pulse or a square wave. The rising or falling edge of the external reference signal triggers the Phase Lock Loop (PLL) to lock the external signal. Based on the frequency of the reference signal, the OE1201 can detect the harmonics of the input signal. The maximum harmonic signal frequency can reach 32,767 times the fundamental frequency, and the maximum harmonic frequency cannot exceed the maximum operating frequency of the instrument by 120 kHz. 


    OE1201 has a 3.5-inch 320 x 240 color TFT-LCD. The measurement results of OE1201, such as X, Y, R, and θ, are shown in numerical form.


Internal Oscillator

    The internal oscillator of OE1201 generates a low distortion (–80 dBc) sine reference signal varying from 50 mHz to 120 kHz, which has a high frequency resolution of 1 mHz. The frequency and amplitude of the reference signal can be set by using the front panel of OE1201 or communication interface. When OE1201 is set in the external reference mode, the internal reference signal is phase-locked with the external reference signal.



Signal Generator

    OE1201 uses a high precision digital-to-analog converter (DAC) to output a sine wave signal at the same frequency as the internal reference signal. The amplitude and phase of the output sine wave can be set through the OE1201's display, where the maximum amplitude of the sine wave is 1 Vrms.

Manual Operation

    All functions of OE1201 can be selected through the knobs and left and right keys on the interface, and the parameters of the response can be set directly through the Settings button in the right bar.  This instrument is equipped with the corresponding free LabVIEW program, which can effectively use all the test functions of OE1201, including setting the reasonable control parameters of the instrument and reading and saving the measured data of the instrument.  This makes OE1201 easy to use in complex scientific experiments.  On the LabVIEW interface, users can see all control commands and instrument feedback responses.  

Signal Channel

        Voltage input Mode                   Single-ended or Differential

        Full-scale Sensitivity                  1 nV to 1 V in a 1-2-5 sequence

        Current input                             106 or 108 V/A
                Voltage                              10 MΩ//25 pF,Ac or DC coupling 
                Current                              1 kΩ to virtual ground 
        C.M.R.R                                     >100 dB (within 100kHz),  >90dB (beyond 100kHz) 
        Dynamic reserve                        >100 dB
        Gain accuracy                            0.2% typ, 1% max 
        Voltage Noise 
                997Hz                                9 nV/Hz
        Current Noise 
                97 Hz                0.13 pA/√ Hz 
                997Hz                0.14 pA/√ Hz 
        Line filters                                   50/60 Hz and 100/120 Hz 
        Gounding                                    BNC (A/I, B)shield can be grounded or floated via 10 kΩ to ground

        Stability                   2ppm/℃

Reference Channel 

                Frequency range                50 mHz to 120 kHz
                Reference input                  TTL or Sine 
                Input impedance                 1 MΩ//25pF 
                 Resolution                           0.01°
                 Absolute phase error          <1°
                 Relative phase error           <0.01°  
                 Phase noise 
                       Internal ref.                   Synthesized, <0.0005°rms at1 kHz 
                       External ref.                  0.01°rms at 1 kHz (100 ms time constant, 12 dB/oct) 
                       Below 10 kHz               <0.01°/℃  
                       Above 10 kHz               <0.1°/℃ 

        Acquisition time 

                 Internal Ref.                         Instantaneous acquisition

                 External Ref.                        (10 cycles + 40 ms) or 100 ms


        Screen                                        3.5 inch, 640×480 TFT Color LCD

        Screen format                            Single or dual display

        Display quantities                       Each display shows one trace,

                                                            traces can be defined as X,Y,R,θ 

        Display types                              Numerical form, bar graph, XY plot and polar plot

        Color style                                  yellow,green

AUX Inputs and Outputs  

        CH1 and CH2 Outputs 

                Function                             Output X, Y, R, θ and harmonic

                Voltage                               ±10 V 

                Drive current                      ±30mA max


        RS-232 to USB                           RS-232 to USB2.0 interface

        RS-232 interface                         Standard 9 pin RS-232 male socket

        IEEE-488 interface(optional)


        Power requirements 

                Voltage                                220~240 V AC

                Frequency                           50/60 Hz 
                Power                                  Standard 10W, Max. 20W

        Power supply rejection                70dB@1MHz

        Weight                                         3.2 KG      


                Width                                  259 mm

                Depth                                  320 mm


                        With feet                     115 mm

                        Without feet                102 mm

Scanning microscope                AFM、STM、SPM

Materials science                      Carrier mobility, Carrier density, Hall effect, Ultrasonic materials  

Transport measurement            Conductivity measurement, Impedance measurement

Noise represents                       Noise density, Cross-correlation measurement

Optical experiment                    Spectral analysis, Spectral measurement, THz measurement, TDLAS 

Sensor measuring                     Gyroscope, Photoelectric sensor, Resonator, Accelerometer

Magnetic Sensor                       SQUIDs, NV color center, Atomic Magnetometer, VSM

Biomedical                                Microfluidic  

Chinese Interface


English Interface


RS232 to GPIB Modul

        RS232-GPIB conversion module is optional, which is compatible with RS232 interface of all Products of SSI. 


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