Signal Recovery- Dual Phase Wide Bandwidth DSP Lock-in Amplifier (Model: 7280)

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The model 7280 DSP Lock-in Amplifier is an exceptionally versatile instrument with outstanding performance. With direct digital demodulation over an operating frequency extending up to 2.0 MHz, output filter time constants down to 1 µs and a main ADC sampling rate of 7.5 MHz it is ideal for recovering fast changing signals. But unlike some other high frequency lock-ins, it also works in the traditional audio frequency band.

In addition to its excellent technical specifications, it is also very easy to use. The front panel is dominated by a large electro-luminescent display panel, used both to show the instrument's outputs and for adjusting its controls via a series of menus. Controls are set by a combination of the use of the keys surrounding the display and the keypad, while four cursor-movement keys simplify use of the graphic display menus.

Users of the SIGNAL RECOVERY (formerly PerkinElmer/EG&G) 7260 and 7265 will find switching to the 7280 very easy, since we've designed it with a similar menu structure. The only significant changes are in some of the control menus, where the better resolution of the display allows both the controls and the instrument outputs to be shown simultaneously, for even faster feedback on the effects of control adjustments.

Naturally, the instrument includes the extended operating modes like dual reference, dual harmonic and virtual reference made popular by the 7260 and 7265, as well as the spectral display mode used to aid reference frequency selection. It also includes GPIB and RS232 interfaces for remote computer control and a range of auxiliary analog and digital inputs and outputs. Software support is available in the form of a LabVIEW driver supporting all instrument functions, and the Acquire™ data acquisition software. The driver and a demonstration version of the software, DemoAcquire, are available for download from this site.

In summary, if you need a lock-in capable of working beyond the traditional audio frequency band but still want the drift-free performance that only digital demodulation brings, then look no further – you have found it in the SIGNAL RECOVERY Model 7280.

  • 0.5 Hz to 2 MHz operation
  • Direct digital demodulation without down conversion
  • 7.5 MHz main ADC sampling Rate
  • 1 µs to 100 ks output time Constants
  • Dual Reference, Dual Harmonic and Virtual Reference modes
  • Spectral display mode
  • Scanned probe microscopy
  • Optical measurements
  • Audio studies
  • AC impedance studies
  • Atomic force micorscopy

The model 7280 DSP lock-in amplifier is an exceptionally versatile instrument with outstanding performance.


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)

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