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ELIMINATES
ELECTRICAL INTERFERENCE
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Simple 50/60 Hz Sine Waves
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Mixtures of 50/60 Hz Harmonics
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Noise Spikes From Dimmers
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Complex Noise From Fluorescent Lamps
NO
WAVEFORM DISTORTION
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No Frequency Loss
¤ No
DC Voltage shift
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Signal Attenuation
¤ No
Phase Error |
ELIMINATE
50/60 Hz NOISE AND HARMONICS WITHOUT FILTERING
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A
POWERFUL NEW APPROACH TO NOISE CONTROL
The
Hum Bug uses an advanced technology to eliminate
electrical interference from analogue signals without
any signal degradation.
PROBLEM:
Signals
recorded using biological an other high impedance
devices are often contaminated with 50/60* Hz noise
and harmonics originating from power supplies, power
mains and lights. The presence of noise corrupts the
information content of these signals an can degrade
the quality of subsequent data analysis. This
electrical interference is notoriously difficult to
remove without altering the original signal imbedded
within the noise.
In theory, proper attention to grounding and
appropriate shielding can eliminate electrical
interference. In practice, noise remains a frequent
and distressing problem in the daily operation of many
laboratories. Even with diligent attention to details,
noise may come and go for no apparent reason and may
appear during critical phases of data collection. The
effort required to maintain noise at an acceptable
level is both time consuming and frustrating.
The Hum Bug solves these problems.
TRADITIONAL
APPROACH: Faraday
cages decrease the magnitude of environmental
noise sources but this protection is often
incomplete and working within a cage can be
cumbersome. Notch or comb filters are occasionally
used to suppress 50/60 Hz noise and harmonics but
these filters will distort the input waveform if
frequency components of the signal overlap with the
filtered frequencies.
NEW
SOLUTION: Quest
Scientific has developed a powerful new technique to
eliminate 50/60 Hz noise and harmonics from analogue
signals without filtering. The Hum Bug constructs a
noise replica in real time and continuously subtracts
this replica from the input signal. It performs this
function in the presence of biological activity even
when noise characteristics evolve over time.
ADVANTAGES:
The
Hum Bug is not a filter. It does not create phase
delays, amplitude errors, DC shifts or waveform
distortion. It eliminates 50/60 Hz noise and harmonics
without altering the frequency characteristics of the
input signal even when these frequencies overlap with
noise components.
SIMPLICITY:
The
Hum Bug is a real-time device. Simply connect it
between your preamplifier and any analysis or
recording equipment (oscilloscope etc..). It will
automatically eliminate electrical interference whilst
letting the signal of interest pass through unchanged.
No settings or adjustments are required. The front
panel switches are only used if you wish to bypass
cancellation (BYPASS), stop the adaptation process
(HOLD), or clear the noise replica (CLEAR).
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