The SIGNAL RECOVERY model 7265 uses digital signal processing (DSP) technology to extend the operating capabilities of the lock-in amplifier to provide the researcher with a very versatile unit suitable both for measurement and control of experiments. Operating over a frequency range of 1 mHz to 250 kHz, the model 7265 offers full-scale voltage sensitivities down to 2 nV and current sensitivities to 2 fA. The instrument has a choice of operating modes, signal recovery or vector voltmeter, for optimum measurement accuracy under different conditions, and the use of DSP techniques ensures exceptional performance. The 7265 is capable of measuring the in-phase and quadrature components, vector magnitude, phase angle and noise of the input signal. Virtual Reference Under suitable conditions, this mode allows measurements to be made in the absence of a reference signal Dual Reference In this mode the instrument can make simultaneous measurements on two signals at different reference frequencies, which is ideal, for example, for use in source compensated optical experiments Spectral Display This allows the spectrum of the signals present at the input to be calculated and displayed, which can help when choosing the reference frequency Transient Recorder In this mode, the auxiliary ADC inputs can be used as a 40 kSa/s (25 μs/point) transient recorder, with the captured transient being displayed graphically Frequency Response This built-in experiment allows the internal oscillator frequency to be swept between preset frequencies, while simultaneously measuring the input signal magnitude and phase. The mode is ideal for determining the frequency and phase response of external networks. Harmonic Analysis Most lock-in amplifiers will measure signals at the applied reference frequency or its second harmonic. In the 7265, operation is possible at harmonics up the 65,536th, and in Dual Harmonic mode, simultaneous measurements can be made on two harmonics.
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- 1m Hz to 250 kHz operation
- Direct digital demodulation without down-conversion
- Synchronous oscillator output for input offset reduction
- Dual Reference, Dual Harmonic and Virtual Reference modes
- Spectral display mode