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OE1201

120kHz Compact DSP Amplifier

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Characteristics

  • 50mHz to 120kHz frequency range
  • Low-noise current and voltage inputs
  • >100dB CMMR
  • 2nV to 1V full-scale sensitivity
  • 10us to 3ks time constants
  • >100 dB dynamic reserve
Overview
Now OE1201 DSP Lock-In Amplifier is the newest product of core technology with high performance. Based on the high-speed 4-core architecture, high-precision stabilized ADC and excellent analog performance, it is ideal to detect the weak signals, which are overwhelmed by greatly larger noise components. And OE1201 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.
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Input Channel

OE1201 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 9 nV/√Hz@997 Hz.The input impedance is 10 MΩ and the full-scale inputvoltage sensitivity ranges from 1 nV to 1 V. Besides, OE1201 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 OE1201 can keep a high dynamic reserve of 100 dB. 

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°. OE1201 can work at any fixed frequency from 50 mHz to 120 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 OE1201 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 120 kHz.

Display

OE1201 has a 3.5-inch 320 x 240 color TFT-LCD. The measurement results of OE1201, such as X, Y, R, and θ, are shown in numerical form.


Internal Oscillator

The internal oscillator of OE1201 generates a low distortion (–80 dBc) sine reference signal varying from 50 mHz to 120 kHz, which has a high frequency resolution of 1 mHz. The frequency and amplitude of the reference signal can be set by using the front panel of OE1201 or communication interface. When OE1201 is set in the external reference mode, the internal reference signal is phase-locked with the external reference signal.

Signal Generator

OE1201 uses a high precision digital-to-analog converter (DAC) to output a sine wave signal at the same frequency as the internal reference signal. The amplitude and phase of the output sine wave can be set through the OE1201's display, where the maximum amplitude of the sine wave is 1 Vrms.

Remote Operation

Users can use PC to control OE1201 through communication interfaces, including setting the parameters and reading the measurement data. OE1201 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             2 nV to 1 V in a 1-2-5 sequence
Current input             106 or 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
Noise9 nV/√Hz at 997 Hz

0.14pA/√Hz at 997 Hz

0.13pA/√Hz at 97 Hz
Reference Channel   
Input
        Frequency range     50 mHz to 120 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 120 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 constants10us to 3ks (<200Hz)

10us to 30s (>200Hz)  (6, 12, 18, 24 dB/oct rolloff)
Synchronous filtersAvailable below 20 Hz and 18,24 dB/oct
Display
Screen3.5 inch, 320×240 TFT
Display quantities4 channels of data to display X,Y,R,θ
Display types               Large numeric readout, bar graph, polar plot and strip chart
Internal Oscillator
Frequency
        Range          50 mHz to 120 kHz
        Accuracy           2 ppm + 10 uHz
        Resolution        1 mHz
Distortion-80 dBc (f<10 kHz), -70 dBc (f>10 kHz)
Amplitude                  0.1 Vrms to 1 Vrms
Interfaces
RS-232 to USB interfaces           All instrument functions can be controlled and read through USB interfaces.