Signal Recovery 7230 DSP Lock-in Amplifier
Lock-In Amplifiers

Signal Recovery 7230 DSP Lock-in Amplifier

DSP Lock-In Amplifier with 0.001Hz – 250 kHz operation. Dual reference, dual harmonic and virtual reference modes, tandem demodulation. Low price, controlled via computer.  

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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. Low price, controlled via computer.  

Description:

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 favourite 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.

 

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
     

    Downloads:

    Model-7230 datasheet

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