Chapter 1, INTRODUCTION
1-3
1.3 Key Specifications and Benefits
The SIGNAL RECOVERY Model 7230 represents a further significant advance in
the application of DSP technology in the design of a lock-in amplifier.
Key specifications include:
Frequency range:
Standard unit 0.001 Hz to 120.000 kHz
With 7230/99 option 0.001 Hz to 250.000 kHz
Voltage sensitivity: 10 nV to 1 V full-scale
Current input mode sensitivities: 10 fA to 1 µA full-scale
10 fA to 10 nA full-scale
Line frequency rejection filter
Dual phase demodulator with X-Y and R- outputs
Very low phase noise of < 0.0001
°
rms
Output time constant: 10 µs to 100 ks
5-digit output readings
Dual reference mode - allows simultaneous measurement of two signals at
different reference frequencies
Single and dual harmonic mode - allows simultaneous measurement of up to two
different harmonics of a signal
Tandem demodulation capability - suitable for double demodulation experiments
that would otherwise require two lock-in amplifiers
Virtual reference mode - allows reference free measurements
Direct Digital Synthesizer (DDS) oscillator with variable amplitude and
frequency
Oscillator frequency and amplitude sweep generator
Voltage controlled oscillator frequency or amplitude
8-bit programmable digital I/O port for external system control
Four configurable DAC outputs which can be used as analog signal outputs
and/or as auxiliary DAC outputs
Four auxiliary ADC inputs
Full range of auto functions
Standard USB, Ethernet, and RS232 interfaces
100,000 point internal curve storage buffer
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