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Signal Recovery

Signal Recovery 7270 General Purpose DSP Lock-in Amplifier

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The Signal Recovery 7270 general purpose DSP lock-in amplifier provides excellent signal recovery performance from a range of 1 MHz to 250kHz. The 7270 offers much more than just dual phase lock-in detection at the reference frequency of an applied signal. This lock-in amplifier includes dual reference and dual harmonic detection, which allow signals at two different frequencies to be measured simultaneously. The spectral display mode of the Signal Recovery 7270 shows the power spectral density of the input signal, making it easy to avoid interfering signals when selecting a reference frequency. It is now even possible to perform tandem demodulation. In this mode an amplitude-modulated signal at a (high) “carrier” frequency is first demodulated at that frequency. The resulting in-phase output, at short time constant settings, is a signal at the modulating frequency which is then passed forward for detection by a second set of demodulators running at the same modulating frequency. Such detection techniques, which can be used in pump-probe measurements, have until now required two separate instruments with an analog connection between them.
 
The Signal Recovery 7230 provides a virtual front panel via a web browser which gives it a low profile for integrating into larger system configurations.  This has been achieved by easy-to-use control panels that can be operated from any computer. There is no need to be in front of the instrument to operate it - now you can set up your experiment in the lab but return to the office while it runs, monitoring what is happening via your computer. And if you need to make a change to a setting then it’s as easy as clicking a button on a web page.
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Features
  • 1 mHz to 250 kHz operating frequency range
  • Voltage and current mode inputs
  • 1.0 MHz main ADC sampling rate
  • 10 μs to 100 ks output filter time constants
  • Precision DDS sinewave oscillator with adjustable amplitude and frequency
  • Oscillator output can be amplitude or frequency modulated
  • Harmonic measurements up to 127 × F
  • Dual Reference, Dual Harmonic and Virtual Reference operating modes
  • Easy manual operation using large full-color display, soft keys, and numeric keypad
  • Built-in on-screen context sensitive help
  • Auxiliary analog and digital inputs and outputs
  • Internal data buffer for recording instrument outputs at rates down to 1 μs per point
  • USB, RS232, and Ethernet computer interfaces
Specifications
Voltage Input
Modes A only, -B only or Differential (A-B)
Freq. Response 1 mHz < F < 250 kHz
Full-scale Sensitivity 2 nV to 1 V in a 1-2-5 sequence (e.g. 2 nV, 5 nV, 10 nV, 20 nV, etc.)
Z - FET 10 MΩ // 25 pF, AC or DC coupled
Z - Bipolar 10 kΩ // 25 pF, input must be DC coupled
Max safe input ±12.0 V
Vin Noise - FET 5 nV/√Hz @ 1 kHz
Vin Noise - Bipolar 2 nV/√Hz @ 1 kHz
C.M.R.R. > 100 dB @ 1 kHz degrading by > 6 dB/octave with increasing frequency
Gain Accuracy ±0.5% typ, ±1.0% max
Distortion -90 dB THD (60 dB AC gain, 1 kHz)
General
Power Requirements
Voltage 110/120/220/240 VAC
Frequency 50/60 Hz
Power 40 VA max
Dimensions  
Width 15½" (390 mm)
Depth 7¼" (185 mm)
Height
With feet 7¼" (185 mm)
Without feet 6½" (170 mm)
Weight 12.8 lb (5.8 kg)
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