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ELIMINATE 50/60 Hz NOISE AND HARMONICS WITHOUT FILTERING! Electrophysiological signals often become contaminated with line frequency noise originating from power mains, power supplies, and lighting. The Hum Bug is not a filter. It 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 the noise components. No settings or adjustments are required. The Hum Bug constructs a replica of noise present on the input signal and continuously subtracts this replica from the signal as it passes through the instrument. It performs this function in the presence of biological activity even when noise characteristics evolve over time.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. ELIMINATES ELECTRICAL INTERFERENCE --Simple 50/60 Hz sine waves --Mixture of 50/60 Hz harmonics --Noise spikes from dimmers --Complex noise from fluorescent lamps NO WAVEFORM DISTORTION --No frequency loss --No DC voltage shift --No signal attenuation --No phase error TRADITIONAL CONCERNS: 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 frustration. 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 while it 1ets 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). TECHNICAL OVERVIEW THEORY OF OPERATION: Principle operations of the Hum Bug are illustrated on picture 1. All functions occur in parallel as the signal passes in a direct analogue path between input and output. The key innovation developed by Quest Scientific is the ability to effectively isolate noise from an input signal even when noise characteristics are evolving and 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. APPLCATIONS: The Hum Bug can eliminate 50/60 Hz noise from virtually any analogue 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 PHYSICAL SPECIFICATIONS 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) • Power: 115-120 VAC at 60 Hz., 230-240 VAC at 50/60 Hz. Input Voltages • Input protection: 50 volts peak to peak • Maximum input signal: 5 volts average peak to peak • Maximum noise amplitude 1 volt peak to peak Frequency Response • Noise cancellation: 50/60 Hz and harmonics up to 4 kHz Controls • BYPASS: halts noise cancellation • HOLD: suspends adaptation to evolving noise • CLEAR: clears the noise replica Display LED indicates changing noise levels • GREEN: decreasing amplitude of the noise replica • RED: increasing amplitude of the noise replica hum bug humbug 50 60 5060 50/60 hz 50hz 60hz 5060hz 50/60hz adapt adaptive noise dynamic noise sound interference eliminate noise eliminator noise control elimination noise removal remove noise filter research bio elect electrophysiology electro electrophysical biophysical electrodiagnostics electrophysiology physical sample simple complex harmonic multiple sine wave waves frequency frequencies zero-loss no-loss loss electric electrical filtering harmonics innovative noise control research waveform distortion voltage volt shift attenuation phase error fluorescent dimmers spikes mixture multiple technology analogue power lines generator ground loops oscilloscope cancel cancelation noisy test clean input output impedance electrode interest synthesizer components in-line inline in line combined recreated create addition imbedded overlapping characteristics electrophysiology noise problem electrical harmonic noise eliminate electrical noise how can i eliminate dc noise how to eliminate electrical noise from hum bug noise notch filter humbug electrophysiology noise amplitude from florescent bulbsnoise that bug you oscilloscope quest. problems quest insturuments remove noise in dc ground removing noise electrophysiology what is the noise that occur during using oscilloscope electrophysiology noise problem electrical harmonic noise eliminate electrical noise how can i eliminate dc noise how to eliminate electrical noise from hum bug noise notch filter humbug electrophysiology noise amplitude from florescent bulbsnoise that bug you oscilloscope quest. problems quest insturuments remove noise in dc ground removing noise electrophysiology what is the noise that occur during using oscilloscope 110volt 110 volt 120volt 120 220volt 220 230volt 230 240volt 240 115volt 115 50volt 50 volt peak-to-peak peak 5volt average peak to peak 500khz bypass hold clear control cancelation clear replica remove noise from square wave sawtooth remove 60 hz noise from remove 50 hz noise from 60 hz interference remove 120 hz noise from remove khz noise from remove interference from remove noise interference from remove interference noise from remove changeing noise from remove changing interference from remove dynamic noise from remove oscillating noise from remove oscillating interference from interference from electric noise from electric noise from magnetic interference from magnetic red green color coded increasing decreasing noise replica biological faraday magnitude notch comb filter distort quest scientific advanced noise control for research real-time realtime real time automatic 120hz 120 180hz 180 240 240hz khz all harmonics pickup pick up high gain highgain magnetic sensors audio equipment amplifiers ekg emg eeg microelectrodes quest scientific questscientific quest-scientific richardson industries medical medicine research device Tom richardson joanne bob robert bryan hum bug humbug 50 60 5060 50/60 hz 50hz 60hz 5060hz 50/60hz adapt adaptive noise dynamic noise sound interference noise eliminator noise control elimination removal noise filter research bio elect electrophysiology electro electrophysical biophysical electrodiagnostics electrophysiology physical sample simple complex harmonic multiple sine wave waves frequency frequencies zero-loss no-loss loss electric electrical filtering harmonics innovative noise control research waveform distortion voltage volt shift attenuation phase error fluorescent dimmers spikes mixture multiple technology analogue power lines generator ground loops oscilloscope cancel cancelation eliminate electrical noise how can i eliminate dc noise humbug electrophysiology noise amplitude from florescent Quest is proud to introduce the Hum Bug -- a new approach to Noise Control. This is a powerful new technology for cancelling electrical interference in real-time, avoiding all the traditional problems associated with notch filters. The Hum Bug constructs a replica of noise present on the input signal and continuously subtracts this replica from the signal as it passes through the instrument. It performs this function in the presence of biological activity even when noise characteristics evolve over time Electrophysiological signals often become contaminated with line frequency noise originating from power mains, power supplies, and lighting The Hum Bug is not a filter. It 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 the noise components. No settings or adjustments are required. The Hum Bug constructs a replica of noise present on the input signal and continuously subtracts this replica from the signal as it passes through the instrument. It performs this function in the presence of biological activity even when noise characteristics evolve over time.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. 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 frustration The Hum Bug solves these problems. 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. 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. 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. 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 while it 1ets 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 , stop the adaptation process , or clear the noise replica . Principle operations of the Hum Bug are illustrated on picture 1. All functions occur in parallel as the signal passes in a direct analogue path between input and output. The key innovation developed by Quest Scientific is the ability to effectively isolate noise from an input signal even when noise characteristics are evolving and frequency components of the noise and input signal overlap. Biological signals pass through the Hum Bug unchanged for Frequency components in the range of DC to greater than 500 kHz. Electrical interference often generates a mixture of harmonics at multiples of 50/60 Hz 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. The Hum Bug can eliminate 50/60 Hz noise from virtually any analogue 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. . bulbs remove noise in dc ground removing noise electrophysiology the hum noise noisy test clean input output impedance electrode interest synthesizer components in-line inline in line combined recreated create addition imbedded overlapping characteristics 110volt 110 volt 120volt 120 220volt 220 230volt 230 240volt 240 115volt 115 50volt 50 volt peak-to-peak peak 5volt average peak to peak 500khz bypass hold clear control cancelation clear replica remove noise from square wave sawtooth remove 60 hz noise from remove 50 hz noise from 60 hz interference remove 120 hz noise from remove khz noise from remove interference from remove noise interference from remove interference noise from remove changeing noise from remove changing interference from remove dynamic noise from remove oscillating noise from remove oscillating interference from interference from electric noise from electric noise from magnetic interference from magnetic red green color coded increasing decreasing noise replica biological faraday magnitude notch comb filter distort quest scientific advanced noise control for research real-time realtime real time automatic 120hz 120 180hz 180 240 240hz khz all harmonics pickup pick up high gain highgain magnetic sensors audio equipment amplifiers ekg emg eeg microelectrodes quest scientific questscientific quest-scientific richardson industries medical medicine research device Tom richardson joanne bob robert bryan