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

We offer BOTH lab bench and OEM circuit-board level lock-ins. The 410, 420 and 450 are lab bench instruments.

The BIG News: The new Model 450S Lock-in is a DIGITAL DSP dual phase unit, controlled via Ethernet or RS232 from your computer browser using supplied software. It is the least expensive DSP lockin on the market, has 100 dB dynamic reserve, and will blow the socks off the competition! Well, maybe not... the 450S frequency range is 0.001 Hz to 200 kHz so yes, the more expensive ones beat us on that, but otherwise...

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 has been discontinued
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 buy at least 50 pieces.

Scitec Model 442 manual

Questions? Comments? Suggestions? Send email to the Webmaster at Boston Electronics.