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Model 7270
DSP Lock-in Amplifier
Overview
The model 7270 sets a new standard for general-purpose DSP lock-in
amplifiers. We've 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 we’ve included all the best
features of our model 7265 and 7280
instruments. What’s more, the new architecture has allowed us to offer
even better specifications in an instrument that is physically much more
compact than older designs. 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.
Versatility
In common with other models in our range, the 7270 offers much more
than just dual phase lock-in detection at the reference frequency of an
applied signal. We’ve included features unique to SIGNAL RECOVERY
instruments such as dual reference and dual harmonic detection, which
allow signals at two different frequencies to be measured simultaneously.
The spectral display mode shows the power spectral density of the input
signal, making it easy to avoid interfering signals when selecting a
reference frequency. It is now even possible to perform tandem
demodulation. In this mode an amplitude-modulated signal at a (high)
"carrier" frequency is first demodulated at that frequency. The
resulting in-phase output, at short time constant settings, is a signal at
the modulating frequency which is then passed forward for detection by a
second set of demodulators running at the same modulating frequency. Such
detection techniques, which can be used in pump-probe measurements, have
until now required two separate instruments with an analog connection
between them.
Fast Data Processing
The main ADC sampling rate and the rate at which the analog signal outputs
are updated is 1 MSa/s, giving excellent performance when used at
short output filter time constant settings, such as in scanned probe
measurements. But we’ve also increased the maximum rate at which data
can be stored to the internal curve buffer to 1 µs per point,
allowing for the first time direct capture of instrument outputs when
using these short time constants. The buffer length has also been
increased to 100,000 sets of points, giving recording times of 100 ms
at the fastest sampling rates. What’s more, in the fast capture mode the
length does not need to be divided by the number of outputs being stored,
making it possible, for example, to store the full 100,000 points of X, Y
and auxiliary ADC1 values at the same time.
Remote Control
The built-in RS232, USB and Ethernet connections allow full operation from
a controlling computer. We offer a comprehensive software package,
Acquire, that can operate the instrument via any of these interfaces and
makes it easy to set up and run complex experiments, such as frequency
response measurements, as well as allowing remote control of every
instrument function. Users who wish to do their own programming can use
our ActiveX control and toolkit (SRInstComms), or free LabVIEW driver, to
simplify the task.
See what you’ve been missing...
In summary, if you’re looking for a general purpose lock-in to work
in the range 1 mHz to 250 kHz then you need look no further -
you’ve found it in the SIGNAL RECOVERY model
7270.
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
specifications
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is
a trademark of AMETEK, Inc.