The SIGNAL RECOVERY model 7265 uses the latest digital signal processing (DSP) technology to extend the operating capabilities of the lock-in amplifier to provide the researcher with a central measurement and control facility. At the same time due consideration has been given to the needs of users wishing only to make a simple measurement quickly and easily.
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 unit 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 instrument performs all of the normal measurements of a dual phase lock-in amplifier, measuring the in-phase and quadrature components, vector magnitude, phase angle and noise of the input signal.
Several new modes of operation are also include giving the user greater levels of versatility than ever before, for example;
Under suitable conditions, this mode allows measurements to be made in the absence of a reference signal
In this mode the instrument can make simultaneous measurements on two signals at different reference frequencies, which is ideal, for example, for use with our model 198A, model 197 or model 651-1 dual-beam choppers in source compensated optical experiments.
This allows the spectrum of the signals present at the input to be calculated and displayed, which can help when choosing the reference frequency
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