OE1022 Lock-in Amplifier
102kHz Digital Lock-in Amplifier
1mHz to 102kHz frequency 
10us to 3ks time constants
>120 dB dynamic reserve
1nV to1V full-scale sensitivity
Multiple-harmonic measurement 
FFT spectral analysis
5.6-inch color display
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 OE1022 can be switched to operate in the single-ended or differential voltage mode, and the input noise is 5 nV/√Hz. The input impedance is 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1V. Besides, OE1022 can also be used for current measurements with variable current gains of 10^6 or 10^8 V/A. 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 OE1022 has inherently large dynamic reserve up to 100dB. The sampling rate of 312.5KSPS is determined by a precision 24-bit A/D converter and a specific filter is designed to avoid aliasing.


Reference Channel

In order to provide the reference signal for OE1022, 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 0.01° resolution. The internal reference mode can operate at a fixed frequency from 1 mHz to 100 kHz. In addition, the external reference is also applicable to OE1022, 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 OE1022. The maximum frequency of the measurable harmonics is 32767 times of basic frequency, and it is also less than the maximum operational frequency 100 kHz.


Display

OE1022 uses the 5.6 inch 640×480 TFT color display as its screen. Data measured by OE1022, such as, X, Y, R, θ, is stored in up to four traces. Trace values can be displayed as a bar graph or as a strip chart showing the trace values as a function of time.

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Besides, OE1022 can display polar plots, showing phasor composed by in-phase and quadrature components of the signal. All displays can be easily scaled by the manual operation, and the auto-scale feature is available to optimize display quickly. The screen can be configured as a single large display, or two horizontally-split displays.

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Simultaneous Multiple-harmonic Measurement

The traditional phase-locked amplifier can only measure fundamental frequency signal or one certain harmonic ware at the same time, so it can not meet the requirement in some occasions when measuring multiple frequency components simultaneously is needed. In digital end, OE1022 combined FPGA and ARM technology, which has wider processing bandwidth and more flexible digital framework. The digital processing precision could reach 48 bits and could measure 3-channal harmonic components simultaneously, which makes one OE1022 is equal to three traditional phase-locked amplifiers.

 

Remote Operation

The built-in RS232 to USB interfaces on OE1022 allow full manual operation from a controlling computer, including setting or interrogating control and reading out data. Free LabVIEW program is provided. It makes it easy to set up and run complex experiments, such as remote control of every instrument function. The display menu offered by the LabVIEW program allows customers observe all command received and responses generated by instrument.

Signal Channel

Voltage Input Mode                                            Single-ended or Differential

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

                                                                            1 fA to 1 µA

Current input                                                       10e6 or 10e8 V/A

Impedance

       Voltage                                                         10 MΩ

       Current                                                         1 kΩ to virtual ground

C.M.R.R                                                               >100 dB to 10 kHz, decreasing

Dynamic reserve                                                  >120 dB

Gain accuracy                                                      0.2% typ, 1% max

Voltage Noise                                                       5 nV/√Hz at 997 Hz

Current Noise                                                       5 fA/√Hz at 97 Hz

                                                                             13 fA/√Hz at 997 Hz

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 102 kHz

       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 10 kHz

                                                                                   <0.1 deg/℃ above 10 kHz

Harmonic detection                                                    2F, 3F, …nF to 102 kHz (n<32,767)

Acquisition time                                                          Internal Ref. Instantaneous acquisition

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


Demodulator

Number of demodulators                                           3

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                                                           10 µs to 3 ks (<200 Hz)

                                                                                    10 µs to 30 s (>200 Hz)

Synchronous filters                                                      Available below 200 Hz(18, 24 dB/oct rolloff)


Internal Oscillator

Frequency Range                                                        1mHz to 102kHz

       Accuracy                                                                2 ppm + 10 µHz

       Resolution                                                             1 mHz

Disrortion                                                                      -80 dBc (f<10 kHz),-70 dBc (f>10 kHz)

Amplitude                                                                      0.001Vrms to 5 Vrms ( Resolution:1 mVrms)

       Accuracy                                                                1%

       Stability                                                                  50 ppm/℃

Sine Outputs                                                                 Sine signal,output impedance 50 Ω

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


Display

Screen                                                                           5.6inch, 640 X 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, polar plot and strip chart


AUX Inputs and Outputs

CH1 and CH2 Outputs

       Function                                                                   Output X, Y, R, θ

       Output Voltage                                                          ±10 V full scale.

                                                                                         30 mA max output current

       Update Rate                                                              312.5kHz

AUX Inputs

       Function                                                                     4 Channel Inputs

       Amplitude                                                                   ±10 V,1 mV resolution ratio

       Impedance                                                                 1 MΩ

AUX Outputs

       Function                                                                      4 Channel Outputs

       Amplitude                                                                    ±10 V,1 mV resolution ratio

       Drive current                                                               ±25mA max

Trigger Input

       Function                                                                      TTL external trigger is used for data storage

Monitor Output

       Function                                                                       Analog output of a signal-amplifier

       Drive current                                                                ±40mA max


Interfaces

RS-232 to USB interface

IEEE-488 interface(optional)


General

Power requirements

       Voltage                                                                             220~240 V AC

                                                                                                100~120 VAC(optional)

       Frequency                                                                         50/60 Hz

       Power                                                                                30 W

Power supply rejection                                                             70dB@1MHz

Weight                                                                                      11 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

Chinese Interface

OE1022中文软件界面


English Interface

OE1022英文软件界面

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