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Company:Signal Recovery
Product:Dual Phase DSP Lock-in Amplifier
Model7230
InformationSignal Recovery

Specifications

General Dual-phase DSP lock-in amplifier operating over a reference frequency range of 1 mHz to 120 kHz. 7230/99 option extends upper frequency limit to 250 kHz. Main ADC sampling rate, and analog output update rate, of 1 MSa/s.

Wide range of extended measuring modes and auxiliary inputs and outputs.

Built-in web server displays pages containing instrument controls and outputs on any computer running a compatible browser that is connected to the same Ethernet network. 

User-upgradeable firmware.

Measurement Modes
Outputs The instrument can simultaneously show any four of these outputs on the web control panels:
X In-phase
Y Quadrature
R Magnitude
Θ Phase Angle
Noise
Harmonic Detection nF, n ≤ 127
Dual Harmonic Simultaneously measures the signal at two different harmonics F1 and F2 of the reference frequency
Dual Reference Simultaneously measures the signal at two different reference frequencies, F1 and F2 where one is the internal and the other the external reference
Tandem Demodulation Demodulates the signal using the reference frequency F1, and then passes the resulting X channel output to a second demodulator running at reference frequency F2. Either F1 or F2 can be the internal reference, with the other being the external reference
Virtual Reference Locks to and detects a signal without a reference (100 Hz ≤ F ≤ 120 or 250  kHz)
Noise Measures noise in a given bandwidth centered at the reference frequency F
Control Panels Four web control pages showing four selected outputs and controls for all instrument functions. Includes the ability to send any control or output ASCII command that can be sent via any interface and view the response.
Signal Channel
Voltage Input
Modes A only, -B only or Differential (A-B)
Frequency Response 1 mHz < F < 120 or 250 kHz
Full-scale Sensitivity 10 nV to 1 V in a 1-2-5 sequence (e.g. 10 nV, 20 nV, 50 nV, 100 nV, etc.)
Impedance - FET input 10 MΩ // 25 pF, AC or DC coupled
Impedance - Bipolar input 10 kΩ // 25 pF, input must be DC coupled
Max safe input ±12.0 V
Voltage Noise - FET input 5 nV/√Hz @ 1 kHz
Voltage Noise - Bipolar input 2 nV/√Hz @ 1 kHz
C.M.R.R. > 100 dB @ 1 kHz degrading by no more than 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 10 fA to 10 nA in a 1-2-5 sequence
  Wide Bandwidth 10 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
Either Input Mode
Line Filter Filter can be set to attenuate 50/60 Hz, 100/120 Hz, or both frequency bands
Max. Dynamic Reserve > 100 dB
Grounding BNC shield can be grounded or floated via 1 kΩ to ground
Signal Monitor
  Amplitude  ±1 V FS. This is the signal after preamplification and filtering, but before transmission over the optical link
  Output Impedance 1 kΩ
Reference Channel
Reference Input
TTL input setting
Frequency Range 1 mHz to 250 kHz
Analog input setting
  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 acquisition
  External Reference 2 cycles + 1 s
Reference Frequency Meter Resolution 4 ppm or 1 mHz, whichever is the greater
Demodulator and Output Processing
Output Zero Stability
  Digital Outputs No zero drift on all settings
  Web Display Outpurs No zero drift on all settings
  DAC Analog Outputs <  100 ppm/°C
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
Reference Monitor Rear panel TRIG OUT connector can be configured to generate TTL signal at current reference frequency, internal or external
Oscillator - General
Frequency
  Range 1 mHz to 120 or 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 120 or 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
Auxiliary Inputs
ADC 1, 2, 3 and 4
  Maximum Input ±11 V
  Resolution 1 mV
  Accuracy ±20 mV
  Input Impedance 1 MΩ // 30 pF
  Sample Rate 250 kHz maximum (one ADC only)
  Trigger Mode Internal, External or burst
  Trigger Input TTL compatible, rising or falling edge
Outputs
Analog Outputs
DAC1 X, X1, Mag2, User DAC1, Output function
DAC2 Y, Y1, Pha2, User DAC2, Output function
DAC3 X2, Mag, Mag1, User DAC3, Output function
DAC4 Y2, Pha, Pha2, User DAC4, Output function
Output Functions Noise, Ratio, Log Ratio and User Equations 1 & 2
Amplitude
  X(1), Y(1), Mag(1),
  Pha(1)
±2.5 V full-scale; linear to ±300% full-scale
  User DACs and
  Output Functions
±10.0 V full-scale
  Impedance 1 kΩ
  Update Rate
    X(1/2), Y(1/2),
    Mag(1/2), Pha(1/2)
    @ TC < 1 s
1.0 MHz
    User DACs, Output
    Functions and
    TC’s > 1 s
1 kHz
8-bit Digital Port  
  Mode 0 to 8 lines can be configured as inputs, with the remainder being outputs
  Status Each output line can be set high or low and the status of each input line read
Power - Low Voltage ±15 V at 100 mA 5-pin 180° DIN connector for powering compatible SIGNAL RECOVERY preamplifiers
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
Interfaces
Built-in web server displays pages containing instrument controls and outputs on any computer running a compatible browser that is connected to the same Ethernet network. USB 2.0, Ethernet, and RS232 allow complete control of instrument settings, and data readout, from other software packages.
General
Power Requirements Via external model PS0110 universal power supply 
  Voltage 110/120/220/240 VAC
  Frequency 50/60 Hz
  Power 40 VA max
Dimensions
  Width Width 15½" (390 mm) 
  Depth Depth 10" (250 mm)
  Height
    With feet With feet 3" (75 mm)
    Without feet Without feet 2½" (64 mm)
Weight Weight 6.6 lb (3.0 kg)
Options
Model 7230/99 Increases upper reference frequency limit from 120 kHz to 250 kHz. Can be installed by simple firmware upgrade.

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