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8 Channel D400 Mains Noise Eliminator Information from Digitimer

D400 8 channel.jpg

The new Digitimer 8 Channel D400 has been added to their line of AC mains noise eliminators which now includes the original Hum Bug single channel as well as a 2 and 4 channel version. Digitimer D400 AC mains noise eliminators have many applications including whole animal research, in vitro electrophysiology setups and in a clinical neurophysiology environment and are supplied with Windows PC software that acts as a virtual control panel for the instrument.


Digitimer mains noise eliminators are not 60Hz (or 50Hz) noise filters. With a traditional notch filter, experimental recordings can suffer from the degradation resulting from shifts in phase, frequency loss, errors in amplitude, shifts in direct current, etc. The D400 eliminates only 60Hz (or 50Hz) electrical interference (including harmonics) without changing the experiment’s signals. Thus, the resulting results are pure and unadulterated.


With the D400 there is no data distortion. This is a significant feature of the D400. The design completely recognizes the actual input waveform (even if it overlaps the mains noise from the AC line) and “ignores” it so that it can completely be represented and recorded. This can be critically important for researchers that are working with experiments that are sensitive and detailed.


The D400 is quick and constantly updates surveillance if/when the affecting mains noise infiltrates an experiment. But, as quick as the D400 is, it also adapts to even lower physiological amplitudes are present. Harmonics won’t get by either that have frequencies greater than 1kHz.


The D400 has different templates for each channel. So, it’s possible to use the D400 with different set ups in a laboratory. Keep in mind, however, that the D400 has a couple of functions that are applied globally to all channels at the same time but these can be bypassed by using the included virtual software. Refer to the user’s manual for additional information.

Hum Bug Noise Eliminator

Digitimer Single Channel Hum Bug

For nearly 20 years, Quest Scientific has been known for their very effective Hum Bug AC mains noise eliminator. Researchers worldwide depend on the Quest Hum Bug to help deliver clean analog research results from EMG, EEG, EKG, etc. recordings and other experiments. The one channel Hum Bug is NOT a filter. It does not create phase delays, amplitude errors, DC shifts, or waveform distortion. Therefore, the resulting signals after eliminating the 60Hz mains noise (including harmonics) are in their truest form.


60Hz Mains noise is eliminated without altering the signal of interest even when frequencies within the signal overlap the mains noise components. There is no need to set or adjust the Hum Bug. It, intelligently, constructs a replica of mains noise present on the input signal and continuously subtracts this replica from the signal. The Hum Bug’s design constantly updates as mains noise characteristics evolve. The Hum Bug is very effective at removing mains noise associated with inadequate grounding, ground loops, and electrical pick up.

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