Lock-In Amplifiers

Lock-in amplifiers are used to measure the amplitude and phase of repetitive AC signals buried in noise. They achieve this by acting as a narrow bandpass filter which removes unwanted noise while allowing through the signal which is to be measured. The AC frequency of the signal to be measured is used as a reference signal to set the passband region of the filter, and must be supplied to the lock-in amplifier along with the unknown signal.

What is a Lock-In Amplifier? A quick overview of what lock-in amplifiers do for you
Noise in Lock-Ins A note on interpretation of noise input figures
What Are Lock-In Amplifiers? Scitec Instruments's listing of helpful sites

We offer BOTH lab bench and OEM circuit-board level lock-ins. The 410 and 420 are lab bench instruments.

The 430, 432, 441 and 442 are LOW COST OEM circuit board level products

The 432 and 442 feature RS232 digital control interfaces, but are analog in operation.

Scitec Model 432 Board-Level Singlel Phase Lock-in Amplifier with DIGITAL CONTROL INTERFACE
Scitec Model 442 Board-Level Dual Phase Lock-in Amplifier with DIGITAL CONTROL INTERFACE
Becker & Hickl LIM-100 Single Phase Lock-in Amplifier
Becker & Hickl LIA-150 Dual Phase Lock-in Amplifier with Windows interface HAS BEEN DISCONTINUED. It was a board to go inside the user's Windows PC and based on the ISA bus. The ISA bus is discontinued in modern computers in favor of the PCI bus. It would cost time and money to rework the LIA-150 as a PCI-bus card. No significant demand for the product seems to exist and there are no plans to rework it. Please do not ask for it unless you expect to nbuy at least 50 pieces.

Scitec Model 442 manual

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