Sutter Instrument MP-285, Основные операции

Страница: 19 / 40

MP-285 SYSTEM ROE BASIC OPERATIONS – REV. 4.04 (20210122)
9
2.6 Minimizing Electrical Noise
We are aware of two potential noise sources for users coupling their MP-285 with high-gain,
high input impedance, electrophysiological recording amplifiers. The first is associated with
the manipulator and its connecting cable from the controller. Under certain circumstances
these may act as an antenna concentrating electric field noise that originates from nearby
electrical equipment (computer monitors, and fluorescent lights are the most notorious
offenders) and bringing it into close proximity with recording apparatus. Grounding the
manipulator will largely eliminate this noise source. Ground tabs are located on each motor
housing for this purpose. It should be noted that the manipulator produces negligible
electrical noise when it is not moving because it is powered by a linear power supply with no
AC current present.
The second potential source of noise is associated with the magnetic field radiated from the
power supply transformer in the controller. Certain electrophysiological amplifiers are more
susceptible to generating noise when exposed to this magnetic field. This noise can be
minimized or eliminated by allowing a maximal distance between your MP-285 controller and
your amplifier. It may be possible to decrease this noise source further by placing a soft steel
plate or a piece of high permeability metal between the controller and the amplifier.