Thurlby Thandar Instruments - PRODUCT NEWS

FFT Signal Analyser with 100 kHz bandwidth.

The SR760 signal analyser, now available in the UK from
TTi (Thurlby Thandar Instruments), is an FFT spectrum
analyser with a dynamic range of 90 dB and a real-time
bandwidth of 100 kHz.

The speed and dynamic range of this instrument, coupled with its flexibility
and many analysis modes, make it the ideal choice for a variety of
applications including acoustics, vibration noise measurement and general
electronics use.

The true dynamic range of 90 dB means that for a full-scale input signal the
instrument has no spurious responses larger than -90 dBc (one part in
30,000). Even signals as small as -114 dBc (one part in 500,000) may be
observed by using averaging.

The SR760 uses a pair of high-speed 24-bit digital signal processors (DSPs)
to filter, heterodyne and transform sampled data from its 16-bit analogue to
digital convertor. These DSPs can perform 25 million 24-bit multiplications
and additions each second. This enormous computing capability allows the
analysers to operate at a real-time bandwidth of 100 kHz.

The power of the SR760 does not come at the expense of ease of use.
A simple menu-oriented interface logically groups related instrument functions.
Context-sensitive help is available for all keys and menus. Entire
instrument set-ups can be saved to disk and recalled in a single keystroke.
The spectrum, power spectral density and input time record can be displayed
in a variety of convenient linear and logarithmic units, including volts,
RMS voltage, dBV, dBVrms or user-defined engineering units. The magnitude,
phase and real and imaginary parts of complex signals can all be displayed.
Several window functions including Hanning, flat-top, uniform or
Blackman-Harris can be chosen to optimise in-band amplitude accuracy or
minimise out-of-band sidelobes.

The SR760 also computes both the 15 and 30 band 1/3 octave commonly
used in acoustics and noise measurement applications. A-weighting
compensation is available for octave measurements.

Data tables allow up to 200 selected frequencies to be displayed in a
tabular format, which can be printed out or saved to disk. Convenient limit
tables allow the entry of up to 100 separate upper or lower limit segments
for pass-fail testing.

Three built-in analysis modes simplify common measurements. Harmonic
analysis computes both harmonic power and THD (total harmonic distortion)
relative to a specified fundamental. Sideband analysis computes power in a
set of sidebands relative to the carrier power, and band analysis integrates
the power in a selected frequency band.

All functions of the analyser can be queried and set via the standard RS-232
and GPIB interfaces.

The SR760 costs £4680.00 (plus VAT).

For more information, please contact :-
Thurlby Thandar Instruments

March 2001
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