Signal Recovery 7270 DSP Lock-in Amplifier
Lock-In Amplifiers

Signal Recovery 7270 DSP Lock-in Amplifier

DSP Lock-In Amplifier with 0.001Hz – 250 kHz operation. Dual reference, dual harmonic and virtual reference modes, tandem demodulation. Compact design and a full colour display. 

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Summary Box:

DSP Lock-In Amplifier with 0.001Hz – 250 kHz operation. Dual reference, dual harmonic and virtual reference modes, tandem demodulation. Compact design and a full colour display. 

Description:

The model 7270 sets a new standard for general-purpose DSP lock-in amplifiers. We've taken advantage of the developments in technology since the first DSP lock-in amplifiers were introduced in the early 1990’s to update the core design, but made sure that we’ve included all the best features of our model 7265 and 7280 instruments. What’s more, the new architecture has allowed us to offer even better specifications in an instrument that is physically much more compact than older designs. The result is a lock-in amplifier of outstanding performance that is easy to use and suitable for all measurements over a frequency range extending from 1 mHz to 250 kHz. 

Specifications:

    Signal Channel
    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)
    Current Input
    Mode Low Noise (10E8 V/A) or Wide Bandwidth (10E6 V/A)
    Full-scale Sensitivity
    Low Noise 2 fA to 10 nA in a 1-2-5 sequence
    Wide Bandwidth 2 fA to 1 µA in a 1-2-5 sequence
    Frequency Response (-3 dB):
    Low Noise 1 mHz < F < 500 Hz minimum
    Wide Bandwidth 1 mHz < F < 50 kHz minimum
    Impedance
    Low Noise < 2.5 kΩ @ 100 Hz
    Wide Bandwidth < 250 Ω @ 1 kHz
    Noise
    Low Noise 13 fA/√Hz @ 500 Hz
    Wide Bandwidth 130 fA/√Hz @ 1 kHz
    Gain Accuracy ±2.0% typ, midband
    Max. Dynamic Reserve > 100 dB
    Grounding BNC shield can be grounded or floated via 1 kΩ to ground
    Signal Monitor Amplitude ±1 V FS
    Output Impedance 1 kΩ
    Reference Channel
    Reference Input
    Frequency Range 1 mHz to 250 kHz
    Analog Input (front panel)
    Impedance 1 MΩ // 30 pF
    Sinusoidal Input Level 1.0 V rms*
    Frequency Range 0.5 Hz to 250 kHz
    Squarewave Input Level 250 mV rms
    Frequency Range 2 Hz to 250 kHz
    Reference Channel
    Phase Set Resolution 0.001° increments
    Phase Noise at 100 ms TC, 12 dB/octave slope:
    Internal Reference < 0.0001° rms
    External Reference < 0.01° rms @ 1 kHz
    Orthogonality 90° ± 0.0001°
    Acquisition Time
    Internal Reference instantaneous
    External Reference 2 cycles + 1 s
    Demodulator and Output Processing
    Harmonic Rejection -90 dB
    Output Filters
    Time Constant 10 µs to 100 ks in a 1-2-5 sequence
    Slope (roll-off):
    TC < 5 ms 6 or 12 dB/octave
    TC > 5 ms 6, 12, 18 or 24 dB/octave
    Synchronous Filter Available for F < 20 Hz
    Offset Auto and Manual on X and/or Y: ±300% full-scale
    Phase Measurement Resolution < 0.01º
    Oscillator - General
    Freq. Range 1 mHz to 250 kHz
    Setting Resolution 1 mHz
    Absolute Accuracy ± 50 ppm
    Amplitude Range 1 µV to 5 V
    Max. Setting Resolution 1 µV
    Output Impedance 50 Ω
    Sweep
    Frequency Sweep
    Output Range 1 mHz to 250 kHz
    Law Linear or Logarithmic
    Step Rate 1 kHz maximum (1 ms/step)
    Amplitude Sweep
    Output Range 0.000 to 1.000 V rms
    Law Linear
    Step Rate 20 Hz maximum (50 ms/step)
    Oscillator Output
    Amplitude
    Accuracy ±0.2% typ
    Stability 50 ppm/ºC
    Distortion (THD) -80 dB @ 1 kHz and 100 mV rms
    Data Storage Buffer
    Size 100,000 data points
    Max. Storage Rate
    Fast Mode up to 1 MHz (X1, Y1, X2, Y2, ADC1, Demod I/P 1, Demod I/P 2)
    Normal Mode 1 kHz
    User Settings
    Up to 8 complete instrument settings can be saved or recalled at will from non-volatile memory
    Interfaces
    USB 2.0, Ethernet, and RS232 allow complete control of instrument settings, and data readout.
    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)
    Specifications subject to change without notice

      Downloads:

      7270 Series datasheet

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