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OE2031

3MHz High Speed Lock-In Amplifier

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Characteristics

  • 1mHz to 3MHz frequency range
  • Automatic adjustment
  • Multiple-harmonic measurement
  • 1nV to 1V full-scale sensitivity
  • 10us to 3ks time constants
  • >100 dB dynamic reserve
Overview
Now OE2031 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 16-bit ADC, it is ideal to detect the weak signals, which are overwhelmed by greatly larger noise components. And OE2031 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 in OE2031, which makes this DSP Lock-In Amplifier could meet the needs of scientific research and industrial purposes.
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Input Channel

OE2031 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 3 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, OE2031 can be used for current measurement with gains of 106 or 108 V/A.

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°. OE2031 can work at any fixed frequency from 1 mHz to 30 MHz in this mode. In external mode, the reference signal can be a sine wave or a TTL pulse or square wave. The rising or falling edge of the external reference signal triggers the Phase Lock Loop (PLL) to lock the external signal.

Display

OE2031 has a 5.6-inch 640 x 480 color TFT-LCD. The measurement results of OE2031, such as X, Y, R, and θ, are shown in numerical form, bar graph, X-Y chart and polar coordinates on the display. 

数据bar显示

XY坐标显示

Smith 显示

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, OE2031 combined FPGA and ARM technology, which has wider processing bandwidth and more flexible digital framework. The digital processing precision could reach 54 bits and could measure 3-channal harmonic components simultaneously, which makes one OE2031 is equal to three traditional phase-locked amplifiers.

Remote Operation


Users can use PC to control OE2031 through communication interfaces, including setting the parameters and reading the measurement data. OE2031 is equipped with a free LabVIEW program, which makes it easy to use in complex scientific experiments.


Signal Channel
Voltage input Mode         Single-ended or Differential
Full-scale Sensitivity             1nV to 1 V in a 1-2-5 sequence
Current input             106or 108 V/A
Impedance
        Voltage      10 MΩ // 25pF, AC or DC coupled
        Current      1 kΩ to virtual ground
C.M.R.R           >100 dB to 10 KHz, decreasing by 6 dB/oct
Dynamic reserve              >100 dB
Gain accuracy0.2% typ, 1% max
Noise3 nV/√Hz at997Hz

10 fA/√Hz at 997Hz

7 fA/√Hz at 97 Hz
Reference Channel   
Input
        Frequency range     1 mHz to 3MHz
        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 3MHz (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 constants10us to 3ks (<200Hz)

10us to 30s (>200Hz)  (6, 12, 18, 24 dB/oct rolloff)
Synchronous filtersAvailable below 200 Hz and 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 3 MHz
        Accuracy           2 ppm + 10 uHz
        Resolution        1 mHz
Distortion-80 dBc (f<10 kHz), -70 dBc (f>10 kHz)
Amplitude                  0.001 to 10 Vpp
Interfaces
RS-232 and USB 2.0