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OE2041

30MHz Ultra-high Speed Lock-In Amplifier

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Characteristics


  • 1mHz to 30MHz frequency range
  • A high-performance signal generator
  • 1nV to 1V full-scale sensitivity
  • 30ns to 4.4ks time constants
  • >120 dB dynamic reserve
  • Automatic adjustment
Overview
Now OE2041 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 14-bit ADC, it is ideal to detect the weak signals,which are overwhelmed by greatly larger noise components. And OE2041 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 making this DSP Lock-In Amplifier could meet the needs of scientific research and industrial purposes.
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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 10nV/√Hz@100kHz. The input impedance is 50Ω 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 external sine or TTL signal, or its own internally 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 phaseshifting 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 30 MHz. In addition, the external reference is also applicable to OE2041, including the sinewave reference signal and TTL logic reference signal. The rising and falling 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 limited to the maximum operational frequency 30MHz.


Digital Demodulator and Output Filter

The core of Lock-In Amplifier OE2041 is demodulator. This digital demodulator could be effectively immune from the potential errors caused by DC drift and offset found in analog multipliers or switches. The coherent signal multiplication has been optimized for very low calculation error. The time constants of OE2041 could be configured extending from 30ns to 4.4ks. The roll-offs of the output low-pass filter on OE2041 are 6, 12, 18, 24, 30 ,36,42 and 48 dB/octave. This low-pass filter is carried out by the architecture of digital infinite impulse response (IIR) filters and updated at 250MHz signal sampling rate. The advantages of this design over
common analog instruments are higher dynamic reserve (>120dB), accurate phase shifts (absolute phase error <1°), zero drift, and orthogonality. Meanwhile, below 200 Hz, OE2041 can perform synchronous filtering, which is used to notch out multiples of the reference frequency. This function ensures that OE2041 works quickly at low frequency.


Internal Oscillator

The internal oscillator helps to generate a very low distortion (–80 dBc) reference signal. The single frequency of sine waves can be extended from 1 mHz to 30MHz while the resolution generated is 1 mHz. Both frequency and amplitude can be set from the front panel or a computer. When choosing external reference mode, the internal oscillator is phase-locked to the external reference signal.


Signal Generator

OE2041 generates one sinusoidal signal in range from 1mHz to 30MHz, using 14-bit D/A converter. The frequency and phase shift of this sinusoidal signal are corresponding to that of the internal reference signal, and its amplitude could be set with control menu. The maximum amplitude provided by signal generator is 1Vrms with 1uVrms accuracy.


Display

OE2041 uses the 5.6 inch 640×480 TFT color display as its screen. Data measured by OE2041, 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.


Manual Operation

In addition to displaying data, the color TFT display panel is also used to display the control menu. In conjunction with keys grouped around the screen and numeric keypad, customers could adjust instrument's parameters effectively, such as oscillator frequency, which can be set to a fixed value and to a high precision.


Auto Function

OE2041 has the ability to adjust measurement parameters to optimum setting for input signal. Gain, phase, dynamic reserve and display scaling could all be set with different independent key presses from the control menu. With this function, the input signals could be measured easily and automatically.


Remote Operation

The built-in RS232、 USB 2.0 and enthernet interfaces on OE2041 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 and save the data. 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             1nV to 1 V in a 1-2-5 sequence
Impedance50Ω//5pF or 10 MΩ // 5pF, AC or DC coupled
C.M.R.R           >70 dB to 100 Hz, >50dB to 100kHz
Dynamic reserve              >120 dB
Gain accuracy0.5% typ(<1MHz), 3% max
Noise
       997 Hz14nV/√Hz
       99.99 kHz6nV/√Hz
Reference Channel   
Input
        Frequency range     1 mHz to 30MHz
        Reference input   TTL or sine
        Input impedance      1 MΩ
Square wave reference levelVIH>3V,VIL<0.5V
Sinusoidal reference signalfrequency>1Hz

200 mV < Vpp < 10 V 
Phase
        Resolution        0.01° increments
        Absolute phase error    1°(<1MHz), 5% max
        Relative phase error   <0.01°
Orthogonality
        Internal ref.      Synthesized, <0.0001°rms at 1kHz
        External ref.      0.005°rms at 1 kHz (125 ms time constant, 12 dB/oct)
Harmonic detection              2F, 3F, …nF to 30MHz (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 constants30ns to 4.4ks   (6, 12, 18, 24 ,30,36,42,48dB/oct rolloff)
Synchronous filtersAvailable below 200 Hz and up to 18 dB/oct
Display
Screen5.6 inch, 640×480 TFT
Screen format                Single or dual display
Display types               Large numeric readout, bar graph
Internal Oscillator
Frequency
        Range          1mHz to 30 MHz
        Accuracy           2 ppm + 10 uHz
        Resolution        1 mHz
Distortion-80 dBc (f<10 kHz), -70 dBc (f>10 kHz)
Amplitude                  1 uVrms to 100 Vrms
Interfaces
RS-232Standard 9-pin RS-232 socket
USB2.0USB2.0 High-speed interface
Enternet 1000Mbps Network interface