Skip to content

7280 Wide Bandwidth DSP Lock-in Amplifier

7280 has wide band frequency to 2MHz to support Optics and Laser research  

Our lock-in amplifier software

  • Highlights +

    • Frequency Range up to 2 MHz
    • Dual reference and dual harmonic detection (standard to 20 kHz and options up to 2 MHz) allow signals at two different frequencies to be measured simultaneously
    • Computer-controlled or full front panel
    • GPIB, RS232 control

  • Lock-in Amplifiers +

    Lock-in Amplifiers
    Signal Recovery originated from the Princeton Applied Research, EG&G products for scientific instrumentation.  They are the inventors of the lock-in amplifier.  A lock-in amplifier is an instrument with dual capability.  It can recover signals in the presence of an overwhelming noise background or, alternatively, it can provide high resolution measurements of relatively clean signals over several orders of magnitude and frequency.
  • Software +

    Acquire Data Acquisition Software

    Compatible Instruments:  Acquire will operate the current SIGNAL RECOVERY Models:  7124, 7225, 7230, 7265, 7270, and 7280
    As well as the legacy models:  4161A, 5105, 5113, 5210 and others.
    Up to ten instruments can be operated simultaneously.

    Acquire is a comprehensive data acquisition package designed to operate most current and many former SIGNAL RECOVERY instruments from a personal computer. It is suitable for use with all our lock-in amplifiers, boxcar averager, and 5113 preamplifier, and operates via Ethernet, USB, RS232, or GPIB (IEEE-488) interfaces. For most users, the software eliminates the need for them to write control software, so that they can concentrate on the task of taking data. It will also prove invaluable for others who simply want to operate an instrument from a remote location or who wish to integrate their instrument with other computer controlled systems. Up to ten instruments can be controlled at the same time.

    The package provides two principal modes of operation. First, in remote front panel mode virtually all of the functions of the connected instrument(s) can be controlled from the computer via a series of simple dialogs. The software is instrument sensitive and adjusts the content of these dialogs automatically to reflect the measurement capabilities and functions available in the connected unit. The data outputs to be displayed can be chosen from the range available and these are then clearly shown on-screen.

    The second mode, experiment recording, allows selected instrument outputs to be recorded as a function of time, with the additional option of sweeping certain outputs (e.g. oscillator frequency, auxiliary DAC voltage, digital filter frequency, digital delay and/or digital port setting) as the experiment proceeds. When used with a lock-in amplifier, any auxiliary ADC inputs can be configured as trigger inputs, allowing data to be logged as function of external trigger events.

    As data is acquired, it is displayed on screen and can be printed, as well as being saved for later use. Displayed plots can use a variety of line formats, while four curve cursors allow direct readout of measured values. However, with the very wide range of applications in which SIGNAL RECOVERY instruments can be used, it is not possible to anticipate every possible format in which the acquired data will be displayed. Hence many users take advantage of the export function to save the data to disk for display and/or further manipulation using other software.

    A comprehensive help system is built in and free support is available to registered users.


    SRInstComms is an ActiveX control that allows users of SIGNAL RECOVERY instruments to control them from PC’s running Windows Operating Systems. The requirement is that these programs must be written in a language that supports such controls, which in practice is virtually all modern languages capable of developing Windows applications. 

    The control takes care of all communication between the user-developed program and the instrument, performing the necessary handshaking and decoding status signals over the selected interface, which can be GPIB, RS232, Ethernet or USB, depending on the type of interface fitted to the instrument being controlled. With the exception of speed, the interface type is essentially transparent to the user, making programs portable between systems with different interfaces. 

    It includes an automatic search routine which will find any compatible instruments that are connected to the computer. In most cases, this eliminates the need to adjust the communications settings controls on the instrument. The complete “profile” of connected instruments, together with any user-entered descriptive comments, is then securely saved in the system registry. Subsequent data transmissions to and from the instrument use this information to give the fastest possible communication. 

    Up to ten compatible instruments can be controlled independently or simultaneously, so that for example in a system measuring impedance one lock-in amplifier can measure the sample current while a second measures the voltage. Both instruments can be read via the control and the output readings combined to determine the impedance. 

    The package includes a full printed instruction manual, as well as on-screen help so that programming information is always easily available. In addition, sample applications in Visual Basic, Visual C++, Visual C#, LabVIEW, Excel and VBScript (HTML web page) are supplied. The VB, Visual C++ and Visual C# examples include a working executable as well as a full project workspace with all the corresponding source files. Similarly the LabVIEW, Excel and VBScript demonstration programs are complete with all source code information so that they can be easily edited by the user. 
  • Brochure and Manual +

  • Differentiated Specifications +

     Specifications  7270 7230 7280 7265  7225 
    Dual Reference,
    Dual Harmonics
    YES YES  YES to 20 kHz
    Option to 800 KHz
    or 2 MHz
    YES to 20 kHz NO
    Connectivity Ethernet,
    Frequency Range
    (X to 1 mHz)
    120 kHz
    optional 250 kHz
     250 kHz 2 MHz to 0.5 Hz 250 kHz  120 kHz  
    Dynamic Reserve   100 dB for 1 nV / √ Hz
    Types of References Internal, External
    with Virtual
    Internal, External 
    with Virtual
    Internal, External  Internal, External  Internal, External 
    Control Interface Computer Controlled  Computer Controlled,
    Full Front Panel
    Computer Controlled,
    Full Front Panel
     Computer Controlled, 
    Limited Front Panel
    Computer Controlled,
    Limited Front Panel
  • Detailed Specifications +

    Signal Channel
    Voltage Input
    Modes A only, -B only or Differential (A-B)
    Full-scale Sensitivity
    0.5 Hz ≤ F ≤ 250 kHz 10 nV to 1 V in a 1-2-5 sequence
    250 kHz < F ≤ 2.0 MHz 100 nV to 1 V in a 1-2-5 sequence
    Max. Dynamic Reserve > 100 dB
    Impedance 100 MΩ // 25 pF
    Maximum Safe Input 20 V pk-pk
    Voltage Noise 5 nV/√Hz @ 1 kHz
    C.M.R.R. > 100 dB @ 1 kHz
    Frequency Response 0.5 Hz to 2.0 MHz
    Gain Accuracy ±0.3% typ, ±0.6% max. (full bandwidth)
    Distortion -90 dB THD (60 dB AC gain, 1 kHz)
    Line Filter attenuates 50, 60, 100, 120 Hz
    Grounding BNC shields can be grounded or floated via 1 kΩ to ground
    Current Input
    Mode Low Noise, Normal or Wide Bandwidth
    Full-scale Sensitivity
    Low Noise 10 fA to 10 nA in a 1-2-5 sequence
    Normal 10 fA to 1 µA in a 1-2-5 sequence
    Wide Bandwidth
    F ≤ 250 kHz 1 pA to 100 µA in a 1-2-5 sequence
    F > 250 kHz 10 pA to 100 µA in a 1-2-5 sequence
    Max. Dynamic Reserve > 100 dB
    Frequency Response (-3 dB):
    Low Noise ≥ 500 Hz
    Normal ≥ 50 kHz
    Wide Bandwidth ≥ 1 MHz
    Low Noise < 2.5 kΩ @ 100 Hz
    Normal < 250 Ω @ 1 kHz
    Wide Bandwidth < 25 Ω @ 10 kHz
    Low Noise 13 fA/√Hz @ 500 Hz
    Normal 130 fA/√Hz @ 1 kHz
    Wide Bandwidth 1.3 pA/√Hz @ 1 kHz
    Gain Accuracy ± 0.6% typ, midband
    Line Filter attenuates 50, 60, 100, 120 Hz
    Grounding BNC shield can be grounded or floated via 1 kΩ to ground
    Reference Channel
    TTL Input
    Frequency Range 0.5 Hz to 2.0 MHz
    Analog Input
    Impedance 1 MΩ // 30 pF
    Sinusoidal Input Level 1.0 V rms*
    Frequency Range 0.5 Hz to 2.0 MHz
    Squarewave Input Level 250 mV rms
    Frequency Range 2 Hz to 2 MHz
    *Note: Lower levels can be used with the analog input at the expense of increased phase errors
    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 acquisition
    External Reference 2 cycles + 50 ms
    Reference Frequency Meter Resolution 1 ppm or 1 mHz, whichever is the greater
    Demodulator and Output Processing
    Output Filters
    X, Y and R outputs only
    Time Constant 1 µs to 1 ms in a 1-2-5 sequence, and 4 ms
    Slope (roll-off) 6 and 12 dB/octave
    All outputs
    Time Constant 500 µs to 100 ks in a 1-2-5 sequence
    Slope 6, 12, 18 and 24 dB/octave
    Synchronous Filter Available for F < 20 Hz
    Offset Auto and Manual on X and/or Y: ±300% full-scale
    Absolute Phase Measurement Accuracy ≤ 0.01°
    Range 0.5 Hz to 2.0 MHz
    Setting Resolution 1 mHz
    Absolute Accuracy ± 50 ppm
    Distortion (THD) -80 dB @ 1 kHz and 100 mV rms
    Amplitude (rms)
    Range 1 mV to 1 V
    Setting Resolution 1 mV
    Accuracy ±0.2%
    Stability 50 ppm/°C
    Output Impedance 50 Ω
    Amplitude Sweep
    Output Range 0.000 to 1.000 V rms
    Law Linear
    Step Rate 20 Hz maximum (50 ms/step)
    Frequency Sweep
    Output Range 0.5 Hz to 2.0 MHz
    Law Linear or Logarithmic
    Step Rate 1 kHz maximum (1 ms/step) @ output time constant settings of 500 µs or longer; 140 ms/point otherwise
    Main Analog (CH1 and CH2) Outputs:
    Function X, Y, R, Θ, Noise, Ratio, Log Ratio and User Equations 1 & 2.
    Amplitude ±2.5 V full-scale; linear to ±300% full-scale
    Impedance 1 kΩ
    Update Rate
    X, Y or R @ TC £ 4 ms 7.5 MHz
    All outputs @ TC ³ 500 µs 1 kHz
    Reference Output
    Waveform 0 to 3 V rectangular wave, active in External Reference Mode only
    Impedance TTL-compatible
    Power - Low Voltage ±15 V at 100 mA rear panel 5-pin 180° DIN connector for powering SIGNAL RECOVERY preamplifiers
    Power Requirements
    Voltage 110/120/220/240 VAC
    Frequency 50/60 Hz
    Power 200 VA max
    Width 17¼" (435 mm)
    Depth 19" (485 mm)
    With feet 6" (150 mm)
    Without feet 5¼" (130mm)
    Weight 25.4 lb (11.5 kg)
  • Accessories +

    • Rack Mounts Kits

      Introduction content will come soon. Product page content:

      Keep Reading

  • Optional Software +