Signal Recovery- Dual Phase Lock-in Amplifier (Model:7230 )

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Overview

The model 7230 is a new concept in general-purpose DSP lock-in amplifiers. It offers the excellent signal recovery performance that users expect from our instruments but at a lower price than many competitive models. We’ve achieved this improvement in price/performance ratio by replacing traditional control buttons and display with easy-to-use control panels that can be operated from any computer via your favorite browser. No longer do you 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.

You can use any web compatible device to operate the model 7230, ranging from a simple netbook to the most powerful development machine, from an Android smartphone to the latest iPad. No special software is needed, since the panels work directly through the device’s browser. All that is necessary is that the computer and instrument be connected to the same Ethernet network.

The instrument is also much more compact than traditional designs, making it easier to accommodate in crowded laboratories, and as it does not include any cooling fans it is completely silent, which is especially useful for acoustic research.

It is normally configured for operation over a frequency range extending from 1 mHz to 120 kHz. However, for a small extra charge it can also be delivered, or upgraded via a firmware update pack, to allow operation at frequencies of up to 250 kHz.

Versatility
In common with other models in our range the 7230 offers much more than just dual phase lock-in detection at the reference frequency of an applied signal. It includes features unique to SIGNAL RECOVERY instruments such as dual reference and dual harmonic detection, which allow signals at two different frequencies to be measured simultaneously, and tandem demodulation. It also includes virtual reference mode, allowing reference-free measurement of suitable signals.

Fast Data Processing
The main ADC sampling rate and the rate at which the analog signal outputs are updated is 1 MSa/s, giving excellent performance when used at short output filter time constant settings, such as in scanned probe measurements. The maximum rate at which data can be stored to the internal curve buffer is 1 μs per point, allowing direct capture of instrument outputs when using these short time constants. The buffer length of 100,000 sets of points gives a recording time of 100 ms at the fastest sampling rate.

Remote Control
The built-in web control pages allow full operation via the Ethernet interface, which with the USB and RS232 connections, can also be used to operate the instrument from our comprehensive software package, Acquire, from our ActiveX control and toolkit(SRInstComms), or using the free LabVIEW driver.

See what you’ve been missing…
In summary, the Model 7230 offers a very cost-effective solution to users who need a lock-in amplifier suitable for straightforward applications but with the versatility to also be used in complex experiments.

  • 1 mHz to 120 kHz (250 kHz with 7230/99 option) operating frequency range
  • 1.0 MHz main ADC sampling rate
  • 10 µs to 100 ks output filter time constants
  • Dual Reference, Dual Harmonic and Virtual Reference operating Modes
  • Internal data buffer for recording instrument outputs at rates down to 1 µs per point
  • Ethernet, USB, and RS232 computer Interfaces
  • Free LabVIEW driver

The model 7230 is a new concept in general-purpose DSP lock-in amplifiers.

Specifications

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 Molnitor 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
Freq. Range 1 mHz to 120 or 250 kHz*
Analog input setting
   Impedance 1 MΩ // 30 pF
   Sinusoidal Level 1.0 V rms*
   Frequency Range 0.5 Hz to 250 kHz*
   Squarewave Input Level 250 mV rms
   Frequency Range 2 Hz to 120 or 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 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
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
General
Power Requirements Via external model PS0110 universal power supply
   Voltage 100 – 240 VAC
   Frequency 47 – 63 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 firmware upgrade.
Preliminary specifications subject to change without notice

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