Digitimer D400 Operator's Manual - Page 7

Browse online or download pdf Operator's Manual for Recording Equipment Digitimer D400. Digitimer D400 20 pages. Multi-channel 50/60hz mains noise eliminator, two/four channel

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Digitimer Ltd – D400 Operator's Manual

continuously updates a phase-locked "mains noise template", subtracting this template

from the original analogue signal. Noise removal occurs in real-time and as the noise

template is constantly evolving, the D400 compensates for changes in amplitude or other

characteristics of the noise.

While the method of noise removal employed by the D400 follows the principles of

operation of other single channel devices, such as the Quest Scientific "Humbug", the

hardware and software algorithms of the D400 have been developed wholly by Digitimer

and are unique to this device.

Not only does the D400 remove mains noise in the 50Hz to 60Hz frequency, but it is also

effective at removing associated harmonics of these frequencies. Importantly, and unlike

standard 50/60Hz notch filters, this method of noise removal is not detrimental to signals of

interest, even if they lie within the 50-60Hz frequency range.

Furthermore, the signal pathway through the D400 is analogue throughout, meaning that

the input signals are not digitised at any point, thus preserving complete data integrity.

In normal use, the D400 would be incorporated into the signal processing pathway following

any amplification and signal conditioning stages, but immediately prior to data acquisition

or signal visualisation. Pre-amplification of the signals ensures that the input to the D400 is

of an adequate amplitude to optimise the noise removal process.

Unpacking the D400

After unpacking the D400 and accessories from the shipping carton, please inspect each

piece for any sign of shipping damage. Please contact the carrier and your distributor, or

Digitimer Limited, immediately if there is any damage. Do NOT dispose of the shipping

carton, as the carrier will want to examine it in order to process a damage claim. Digitimer

Limited and their distributors insure all shipments to cover shipping damage.

It is also advisable to keep the shipping carton in the event that the instrument needs to be

returned for service.

Supplied Accessories

The following items are included with the D400 Multi-channel Mains Noise Eliminator:

 Mains lead/Power cord

 USB Cable for host PC connection (D-USBF).

 D400 Operator's Manual (this document).

 2 or 4 Channel Input Lead (female DB9 to multiple BNC): D990-32 (for D400-2),

D990-34 (for D400-4).

Version 1.2