A-M Systems is proud to offer to our customers another high quality instrument designed to improve electrophysiological recordings at an affordable price: The HumBug Noise Eliminator from Quest Scientific.
The 'HumBug' Line Noise Eliminator removes line frequency noise from electrophysiological signals without filtering or requiring ongoing user attention. That means more time getting results, and less time solving continuously evolving noise and ground loop problems.
The HumBug eliminates 50/60Hz electrical interference as well as more complicated noise signals without distorting the raw waveform recordings. The HumBug also does not introduce Frequency Loss, a DC Voltage Shift, Signal Attenuation, or a Phase error recorded signal.
Although the HumBug uses a powerful signal processor, your signal is never digitized. The HumBug continuously constructs a replica of evolving noise present on the input signal and subtracts this replica from the signal, leaving the physiological signal intact. It performs this function in the presence of biological activity even when noise characteristics evolve over time. The HumBug is not a filter, and does not create phase delays, amplitude errors, DC shifts or waveform distortion. Simply connect it between your preamplifier and any analysis equipment and it will automatically eliminate 50/60 Hz. noise and harmonics with frequencies up to several KHz. Noise is eliminated without altering the signal of interest even when frequencies within the signal overlap with noise components. No settings or adjustments are required.
The HumBug is effective at removing noise associated with inadequate grounding, ground loops, and electrical pick up. Common applications include noise elimination from signals using microelectrodes, skin electrodes (EKG, EMG, EEG), high gain amplifiers, magnetic sensors and audio equipment.
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.
** Note: Due to licensing agreements, we are not permitted to sell the Humbug Noise Eliminator to customers located in the UK.
THEORY OF OPERATION: All functions occur in parallel as the signal passes in a direct analogue path between input and output. The HumBug effectively isolates noise from an input signal even when the noise characteristics are evolving and the frequency components of the noise and input signal overlap.
FREQUENCY RESPONSE: Biological signals pass through the Hum Bug unchanged for Frequency components in the range of DC to greater than 500 kHz.
COMPLEX NOISE: Electrical interference often generates a mixture of harmonics at multiples of 50/60 Hz (e.g. 100Hz, 150 Hz, 200 Hz). The Hum Bug eliminates all harmonics with Frequencies up to several kHz. Therefore, even the complex spikes generated by dimmers and fluorescent lamps are eliminated.
APPLICATIONS: The Hum Bug can eliminate 50/60 Hz noise from virtually any analog signal. It is equally effective at removing noise associated with inadequate grounding, ground loops, and electrical pick up. Common applications include noise elimination from signals recorded using microelectrodes, skin electrodes (EKG, EMG, EEG), high gain amplifiers, magnetic sensors and audio equipment.
Shielded steel instrument box with cast aluminum base
- W-6.5” D-7.5”; H-1.3”; (32,2 x 18.1 x 3.1 cm)
- Weight 6 lbs (2.75 Kg)
- Input protection: 50 volts peak to peak
- Maximum input signal: 5 volts average peak to peak
- Maximum noise amplitude: 1 volt peak to peak
- Power Supply: 120V and 240V available
- Noise cancellation: 50/60 Hz and harmonics up to 4 kHz
- BYPASS: halts noise cancellation
- HOLD: suspends adaptation to evolving noise
- CLEAR: clears the noise replica
- LED indicates changing noise levels
- GREEN: decreasing amplitude of the noise replica
- RED: increasing amplitude of the noise replica