OE2041 Lock-in Amplifier
60MHz Digital Lock-in Amplifier
DC to 60MHz frequency
30ns to 4.4ks time constants
>120 dB dynamic reserve
Multiple-harmonic measurement
2.5nV// √Hz input noise
Scope,Spectrum Analyzer
PID Controller, AM Modulation


Introduction
Performance parameter
Performance
Application Area
Software Interface
Data download
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Input Channel

    With the low-noise analog pre-amplifier, the signal input of OE2041 can be switched to operate in the single-ended or differential voltage mode, and the input noise is 6 nV/√Hz@100 kHz. The input impedance is 50 Ω or 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1V. Two line filters (50/60 Hz and 100/120 Hz) are designed to eliminate line related interference. The programmable gain amplifier is provided to adjust the dynamic reserve of the system according to the magnitude of the input signal, so that OE2041 has inherently large dynamic reserve up to 120dB. The sampling rate of 250MSPS is determined by a precision 14-bit A/D converter and a specific filter is designed to avoid aliasing.


Reference Channel

    In order to provide the reference signal for OE2041, an externally applied sine wave or square wave, or its owninternally synthesized reference source could be used. When the instrument is set to internal reference mode, the internal precision stabilized oscillator and the digital synthesized algorithm are used to generate sinewave output that multiplies the input signal, there is virtually no reference phase noise when choosing internal reference mode. Taking advantage of digital phase-shifting technique, the reference signal phase could be adjusted with 0.001° resolution. The internal reference mode can operate at a fixed frequency from 1 mHz to 60 MHz. In addition, the external reference is also applicable to OE2041, including the sinewave reference signal and TTL logic reference signal. The rising and trailing edge of external reference signal are applied to trigger off the internal Phase Locking Loop (PLL). Based on the frequency of reference signal, harmonic detection can be performed by OE2041. The maximum frequency of the measurable harmonics is 32767 times of basic frequency, and it is also less than the maximum operational frequency 60 MHz.


Digital Demodulator and Output Filter

    The key component of the OE2041 is the digital demodulator. Compared to traditional analog lock-in amplifiers, the OE2041's internal digital demodulator effectively rejects the measurement errors caused by DC drift and offset. In addition, by optimizing the multiplication of the internal coherent signal of the digital demodulator, the calculation error is minimized so that the instrument can accurately detect the input weak signal. Time constants of the output low-pass filter from 30 ns to 4.4 ks can be selected with a choice of 6,12, 18, 24, 30, 36, 42 and 48 dB/oct rolloff. This low-pass digital filter is implemented using a high performance digital filter with a sample rate of 250 MHz. The digitaldemodulation and the low-pass filter used in OE2041 guarantees a high dynamic reserve (>120dB), accurate phase (absolute phase error <1 deg). Moreover, when the frequency of the input signal is lower than 200 Hz, A synchronous filter can be used to eliminate the harmonic influence of the reference signal, ensuring that OE2041 can detect a lowfrequency signal quickly and effectively.


Display

    OE2041 has a 5.6-inch 640 x 480 color TFT-LCD. The measurement results of OE2041, such as X, Y, R, and θ, are shown in numerical form and bar graph on the display.In X-Y chart, OE2041 shows the trend of measurement results over time, and check the value by using knob control cursor.

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Remote Operation

    Users can use PC to control OE2041 through communication interfaces, including setting the parameters and reading the measurement data. OE2042 is equipped with a freeLabVIEW program, which makes it easy to use in complex scientific experiments.



Signal Channel

        Voltage input Mode                   Single-ended or Differential

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

        Impedance

                Voltage                              50 Ω // 5pF or 10 MΩ // 5pF,AC or DC coupled
        C.M.R.R                                     >70 dB to 100 Hz

                                                          >50 dB to 100 kHz

        Dynamic reserve                        >120 dB
        Gain accuracy                            0.5% typ(<1MHz), 3% max

        Voltage Noise
                                                           14 nV/Hz at 997 Hz
                                                           6nV/Hz at 99.99 kHz
        Line filters                                   50/60 Hz and 100/120 Hz
        Gounding                                     BNC shield can be grounded or floated via 10 kΩ to ground


Reference Channel


        Input
                Frequency range                1 mHz to 60 MHz
                Reference input                  TTL or Sine
                Input impedance                 1 MΩ
                Square reference level        VIH>3V, VIL<0.5V
                
Sine reference signal          >1 Hz
                                                            > 400 mVpp
        Phase
                 Resolution                          0.001°
       
         Absolute phase error          <1°
                 Relative phase error           <1 mdeg
                 Phase noise
                                                            Internal ref. Synthesized, <0.0001 deg at1 kHz
                                                            External ref. 0.001 deg at 1 kHz (100 ms time constant, 12 dB/oct)
                 Drift
                                                            <0.01 deg/℃ below 100 kHz
                                                            <0.1 deg/℃ above 100 kHz

        Harmonic detection                     2F, 3F, …nF to 60 MHz (n<32,767)

       

        Acquisition time

                                                            Internal Ref.     Instantaneous acquisition

                                                            External Ref.        (2 cycles + 5 ms) or 40 ms,whichever is larger


Demodulator     

        Stability            

                Digital outputs                      no zero drift on all setting

                Display                                 no zero drift on all setting

                Analog outputs                     <5 ppm/℃ for all dynamic reserve settings

        Harmonic rejection                     -90 dB

        Time constants                           30 ns to 4.4 ks (6,12,18,24,30,36,42,48 dB/oct rolloff)

        Synchronous filters                     Available below 200 Hz(18,24,30,36,42,48 dB/oct rolloff)


Internal Oscillator  

        Frequency                                 Range 1 mHz to 60 MHz

         Accuracy                                   2 ppm + 10 µHz

                Resolution                         1 mHz

        Disrortion                                   -80 dBc (f<10 kHz),-60 dBc (f>1 MHz)

        Amplitude                                   1uVrms to 1 Vrms ( Resolution:1 uVrms)

                Accuracy                            0.5%

                Stability                               50 ppm/℃

        Sine Outputs

                                                           Sine signal,output impedance 50 Ω

        TTL Outputs                               5V TTL/CMOS level,output impedance 50Ω


Display

        Screen                                       5.6 inch, 640×480 TFT

        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

        



AUX Inputs and Outputs  

        AUX Inputs

                Function                             4 Channel Inputs

                Amplitude                           ±10 V,1 mV resolution ratio

                Impedance                         1 MΩ

        AUX/CH Outputs

                Function                             4 Channel Outputs

                Amplitude                           ±10 V,0.1 mV resolution ratio

                Drive current                      30mA max


Interfaces

        USB2.0 , RS-232(DB-9) and 1000Mbps Enthernet


General

        Power requirements

                Voltage                                220~240 V AC

                                                            100~120 VAC(optional)

                Frequency                           50/60 Hz
                Power                                  60 W

        Power supply rejection                70dB@1MHz

        Weight                                         12 KG      

        Dimensions

                Width                                  448 mm

                Depth                                  513 mm

                      

                Height

                        With feet                     148 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  

English Interface

OE2042英文软件界面

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