Model 7225
Dual Phase DSP Lock-in Amplifier
The SIGNAL RECOVERY model 7225 offers a
cost-effective solution to the researcher needing the performance provided
by DSP demodulation but not requiring the additional features or higher
operating frequencies of the models 7280 and 7265.
The unit is available both as a conventional instrument with front-panel
controls (model 7225) or with a blank front panel (model
7225BFP) for OEM (or multiple unit) use where computer only operation
is acceptable.
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.
Two auxiliary ADC inputs, four DAC outputs and eight output logic lines
are provided. These can be used to record the magnitude of external
signals associated with the experiment, such as temperature or pressure,
or to generate voltages to control or switch other equipment. Information
from the ADCs together with the lock-in amplifier's output data can be
stored in the 32k point buffer memory prior to transfer back to a
controlling computer.
The model 7225 is extremely easy to use. All instrument controls are
adjusted via the left-hand display panel and its associated keys, while
the right hand panel shows the two selected instrument outputs. Auto
functions need only two keypresses to activate and in many cases eliminate
the need for manual control adjustment.
External control of the unit is via either the RS232 or GPIB
interfaces, using simple mnemonic-type ASCII commands. A second RS232 port
allows up to sixteen 7225 or compatible instruments to be operated from a
single RS232 computer port by connecting them in a "daisy-chain"
configuration.
Software support is available in the form of a LabVIEW driver
supporting all instrument functions, and the Acquire™ data
acquisition software. The driver and a demonstration version of the
software, DemoAcquire, are available for download from this site.
Click here
for detailed 7225 and 7265 specifications
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a trademark of AMETEK, Inc.