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OE1022D

Dual Channel Digital Lock-In Amplifier

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Characteristics

  • 1mHz to 102kHz frequency range
  • 2 independent input channels
  • 2 signal generators
  • 1nV to 1V full-scale sensitivity
  • 10us to 3ks time constants
  • >100 dB dynamic reserve
  • Automatic adjustment
  • Multiple-harmonic
Overview
Now OE1022D 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 OE1022D 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 Multi-reference mode in OE1022D, which makes this DSP Lock-In Amplifier could meet the needs of scientific research and industrial purposes.
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Input Channel

Two independent input channels have high synchronicity and can be individually configured as 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, OE1022D can be used for current measurement with gains of 106 or 108 V/A. 

Reference Channel

Two independent reference channels 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°. OE1022D 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.

Display

OE1022D has a 5.6-inch 640 x 480 color TFT-LCD. The measurement results of OE1022D, such as X, Y, R, and θ, are shown in numerical form, bar graph, X-Y chart on the display.

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 can not meet the requirement of multiple-harmonic measurement in some occasions. On the contrary, OE1022D uses a flexible digital framework combined FPGA and ARM, which make it practicable and efficient to measure 3 harmonic components simultaneously for each input channel, which means that each input channel is equivalent to three traditional lock-in amplifiers. Because of two independent input channels in OE1022D, OE1022D can detect 6 harmonics (2 fundamentals and 4 harmonics) at one time. 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 OE1022D through communication interfaces, including setting the parameters and reading the measurement data. OE1022D is equipped with a free LabVIEW program, which makes it easy to use in complex scientific experiments.

Two 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      1kΩ 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
Noise6 nV/√Hz at 997 Hz

13 fA/√Hz at 997 Hz

14 fA/√Hz at 97 Hz
Two Reference Channel   
Input
        Frequency range     1 mHz to 102kHz
        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 102kHz (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 102kHz
        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 and USB2.0