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Power Amplifiers
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Smaller switch mode amplifiers
The Gearing & Watson range of digital
switching amplifiers comprises two models, the
DSA1 and
DSA4.
These amplifiers provide
very high levels of efficiency (better than 90%) with superior
levels of performance. These amplifiers occupy little space and are
suitable for driving shakers from all manufacturers, as well as
other laboratory
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applications. |
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EMC has been a major factor in the design of the digital switching
amplifiers. Full use has been made of Faraday cages,
compartmentalisation, filtered interconnections, segmented wiring,
common mode chokes for symmetrical currents, mains filters, optical
coupling of signals and screened cables.
The DSA series features low distortion, typically less than 0.3%thd,
a wide bandwidth of 3Hz to 5kHz and a signal to noise ratio of
better than -70dB. The DSA4 is supplied as a fully
enclosed 19 inch instrumentation rack system. Each power amplifier
system comprises a Control Unit, a number of 4kVA power modules, a
power supply, a shaker de field supply and a shaker degaussing coil
supply.
A Control Unit performs the housekeeping functions, providing user
controls and displays to enable switch-on status reporting,
management of a heavy duty power supply and the control of up to six
power modules.
The DSA1 is a 19 inch rack mounting or bench top unit which is
based on the larger model DSA4.
The DSA1-1k
is a full bridge switching amplifier which includes full shaker
protection facilities, configured to provide outputs rated at 1kVA
or 2kVA as the DSA1-2k . The DSA1 series includes all the benefits
associated with larger systems by incorporating the power amplifier,
the dc field supply and an (optional) degaussing supply all in a
compact unit measuring only 266mm high.
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Linear Amplifiers
For small
shaker systems, and other laboratory applications, Gearing & Watson
produce a range of linear power amplifiers in
3
models: PA30E,
PA100E,
PA300E.
These high
quality amplifiers include many special features, such as
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operation in constant current or constant
voltage mode,
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an integral bounce free variable frequency
oscillator,
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bench top configurations.
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