Two independent input channels have high synchronicity and can be individually configured as a single-ended mode or a differential voltage mode. With an ultra low-noise preamplifier, the input noise is as low as 6 nV/√Hz@997 Hz. The input impedance is 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1 V. Besides, OE1022D can be used for current measurement with gains of 106 or 108 V/A.
Two independent reference channels can work in external mode or internal mode. In internal mode, a precise and stable internal oscillator generates sine wave as an internal reference that is multiplied by the input signal. This internal signal is without any phase noise. With the digital phase-shifting technique, the phase resolution of the reference signal is 0.01°. OE1022D can work at any fixed frequency from 1 mHz to 102 kHz in this mode. In external mode, the reference signal can be a sine wave or a TTL pulse or a square wave. The rising or falling edge of the external reference signal triggers the Phase Lock Loop (PLL) to lock the external signal.
OE1022D has a 5.6-inch 640 x 480 color TFT-LCD. The measurement results of OE1022D, such as X, Y, R, and θ, are shown in numerical form, bar graph, X-Y chart on the display.
Simultaneous Multiple-harmonic Measurement
In the traditional lock-in amplifiers, only the fundamental frequency signal or a certain harmonic signal can be measured at one time, so it can not meet the requirement of multiple-harmonic measurement in some occasions. On the contrary, OE1022D uses a flexible digital framework combined FPGA and ARM, which make it practicable and efficient to measure 3 harmonic components simultaneously for each input channel, which means that each input channel is equivalent to three traditional lock-in amplifiers. Because of two independent input channels in OE1022D, OE1022D can detect 6 harmonics (2 fundamentals and 4 harmonics) at one time. The maximum harmonic signal frequency can reach 32,767 times the fundamental frequency, but the maximum harmonic frequency cannot exceed the maximum operating frequency of the instrument by 102 kHz.
Users can use PC to control OE1022D through communication interfaces, including setting the parameters and reading the measurement data. OE1022D is equipped with a free LabVIEW program, which makes it easy to use in complex scientific experiments.