Lastek: Photonics Technology Solutions

The Signal Recovery model 7230 is a new concept in general-purpose DSP lock-in amplifiers. It offers the excellent performance that users expect from such instruments but at a lower price than many competitive models. This improvement in price/performance ratio has been achieved by replacing the traditional control buttons and display with easy-to-use control panels that can be operated from any computer via your favorite browser.

No longer do you need to be in front of the instrument to operate it - now you can set up your experiment in the lab but return to the office while it runs, monitoring what is happening via your computer. And if you need to make a change to a setting then it’s as easy as clicking a button on a web page. The model 7230 can even be operated via iPad, shown above.

In addition to the web control panels, the instrument can also be fully controlled from other software packages, such as Acquire, SRInstComms, orLabVIEW. These support experiments such as frequency response measurements, logging of instruments outputs over time, and integration with other experimental equipment.

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Signal Recovery design and manufacture lock-in amplifiers, signal averagers, amplifiers, light choppers and specialized voltmeters.

Since the invention of the lock-in amplifier, none has been more revered and trusted than the PAR124A by Princeton Applied Research.  With over 50 years of experience, Signal Recovery (formerly Princeton Applied Research) offers the 7124: the only lock-in amplifier that has an all analog front end separated, via fiber, from the DSP main unit.   

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 ..emits no digital switching noise, so your experiment won't know it's there

We are proud to announce the release of our latest product - the model 7124 Precision Lock-in Amplifier. Key features of this sophisticated instrument include:

• All-analog front end RCU (remote connection unit) module coupled to powerful DSP main instrument console via unique analog fiber optic link.
• No digital clock or switching noise is emitted from the RCU connectors
• 0.5 Hz to 150 kHz operating frequency range
• Dual Reference, Dual Harmonic, Virtual Reference and Tandem Demodulation operating modes
• Easy manual operation using large full-color display
• Built-in USB, RS232, and Ethernet computer interfaces

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The Signal Recovery model 7230 is a new concept in general-purpose DSP lock-in amplifiers. It offers the excellent performance that users expect from our instruments but at a lower price than many competitive models. This improvement in price/performance ratio has been achieved by replacing the traditional control buttons and display with easy-to-use control panels that can be operated from any computer via your favorite browser.

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Signal Recovery have released the model 7270 Dual-Phase DSP Lock-In Amplifier. The model 7270 sets a new standard for general-purpose DSP lock-in amplifiers. Signal Recovery have taken advantage of the developments in technology since the first DSP lock-in amplifiers were introduced in the early 1990’s to update the core design, but made sure that they've included all the best features of their model 7265 and 7280 instruments. The result is a lock-in amplifier of outstanding performance that is easy to use and suitable for all measurements over a frequency range extending from 1 mHz to 250 kHz.

The Signal Recovery Model 7210 provides a different dimension to lock-in Amplifier design. Until the introduction of the Model 7210, instruments have  been restricted to a single signal channel, allowing only one, or at most two, signals to be measured at any one time. The Model 7210, with its use of new technology, allows up to 32 signals to be measured simultaneously. What is more, units can be linked together to give more detection channels. For example, four units give 128 channels, while sixteen would give 512 channels. 

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The Signal Recovery model 197 optical chopper is a compact, high performance chopper, offering features and benefits that are ideal for use in modern photometric systems.

The unit is self contained, comprising a dual aperture chopper blade, motor and the necessary driving electronics. Each aperture provides an independent reference output allowing simultaneous dual frequency operation (10:1 ratio) for dual-path experiments. Frequency control is by a precision internal oscillator set by a 4-digit push-button selector on the unit or by the application of an external AC reference signal. The unit is powered via an external line power supply module.

Mounting holes are provided in the base and right-hand side of the housing (viewed from the front) to allow for mounting the model 197 onto an optical bench or support post.

Quartz Crystal Frequency Accuracy and Stability
The model 197 uses a quartz crystal oscillator as its primary frequency standard. The oscillator signal is divided down to yield the required chopper frequency, and then the motor speed is continuously adjusted to phase lock the actual chopper frequency to this required value. The result is a chopper with an output frequency as stable as any other modern frequency source.

External Frequency Control
Like many other choppers, the frequency can be controlled externally. However, unlike other units the control is via an applied TTL reference rather than an analog voltage. This means that the modulation frequency generated is exactly that required which allows this chopper to be used in conjunction with the dual reference modes offered by all our lock-in amplifiers to implement two channel source compensation experiments.

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Quantum Composers designs and manufactures pulse generators, signal generators, current and digital delay generators for the R&D, electronic, and photonic marketplace.