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OE1022

102kHz Digital Lock-in Amplifier

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Characteristics

  • 1mHz to 102kHz frequency range
  • 10us to 3ks time constants
  • >100 dB dynamic reserve
  • 1nV to 1V full-scale sensitivity
  • Multiple-harmonic measurement
  • FFT spectral analysis
  • 5.6-inch color display
Overview
Now OE1022 DSP Lock-In Amplifier is the newest product of core technology with high performance. Based on the digital demodulation, output filter and high-precision stabilized 24-bit ADC, it is ideal to detect the weak signals, which are overwhelmed by greatly larger noise components. And OE1022 could measure the magnitude and phase of a signal simultaneously. It could be comparable with the international leading technology in some core parameters, like accuracy of measurement, range of operating frequency, SNR, dynamic reserve and so on. Meanwhile, we have integrated other functions like multiple-harmonic measurement and FFT in OE1022, which makes this DSP Lock-In Amplifier could meet the needs of scientific research and industrial purposes.
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Input Channel  

OE1022 detects an input signal in a single-ended mode or a differential voltage mode. With an ultra low-noise preamplifier, the input noise is as low as 6 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, OE1022 can be used for current measurement with gains of 106 or 108 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 OE1022 can keep a high dynamic reserve of 100 dB. The high-precision 24-bit ADC has a sampling rate of 312.5kSPS, and the excellent antialiasing filter in front of the ADC can effectively prevent signal aliasing. 

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°. OE1022 can work at any fixed frequency from 1 mHz to 102 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 OE1022 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 102 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.

数据bar显示


OE1022 can also show the relationship of time and range in a XY graph and you can check the value of sampling point by using knob control cursor.


XY坐标显示


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.

Smith 显示


Simultaneous Multiple-harmonic Measurement

In the traditional lock-in amplifiers, only the fundamental frequency signal or a certain harmonic signal can be measured at one time, so it cannot meet the requirement of multiple-harmonic measurement in some occasions. On the contrary, OE1022 uses a flexible digital framework combined FPGA and ARM, which make it practicable and efficient to measure 3 harmonic components simultaneously, which means that one OE1022 is equivalent to three traditional lock-in amplifiers. The maximum harmonic signal frequency can reach 32,767 times the fundamental frequency, but the maximum harmonic frequency cannot exceed the maximum operating frequency of the instrument by 102 kHz.

Remote Operation

Users can use PC to control OE1022 through communication interfaces, including setting the parameters and reading the measurement data. OE1022 is equipped with a free LabVIEW program, which makes it easy to use in complex scientific experiments.

OE1022-EN.png


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             106or 108 V/A
Impedance
        Voltage      10 MΩ // 25 pF, AC or DC coupled
        Current      1 kΩ to virtual ground
CMRR           >100 dB to 10 KHz, decreasing by 6 dB/oct
Dynamic reserve              >100 dB
Gain accuracy0.2% typ, 1% max
Noise6 nV/√Hz at 997 Hz

13 fA/√Hz at 997 Hz

15 fA/√Hz at 97 Hz
Reference Channel   
Input
        Frequency range     1 mHz to 102 kHz
        Reference input   TTL or Sine
        Input impedance      1 MΩ//25 pF
Phase
        Resolution        0.01°
        Absolute phase error    <1°
        Relative phase error   <0.01°
Orthogonality90°±0.001°
        Internal ref.      Synthesized, <0.0001°rms at 1kHz
        External ref.      0.005°rms at 1 kHz (100 ms time constant, 12 dB/oct)
Harmonic detection              2F, 3F, …nF to 100 kHz (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 constants10 us to 3 ks (<200 Hz)

10 us to 30 s (>200 Hz)  (6, 12, 18, 24 dB/oct rolloff)
Synchronous filtersAvailable below 200 Hz （18,24 dB/oct）
Display
Screen5.6 inch, 640×480 TFT
Screen format                Single or dual display
Display types               Large numeric readout, bar graph, polar plot and strip chart
Internal Oscillator
Frequency
        Range          1 mHz to 102 kHz
        Accuracy           2 ppm + 10 uHz
        Resolution        1 mHz
Distortion-80 dBc (f<10 kHz), -70 dBc (f>10 kHz)
Amplitude                  0.001 to 5 Vrms
Interfaces
RS-232 to USB interfaces       IEEE-488 interface（optional）