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5.3. Noise relating to perfusion
- A perfusion pump or its power adaptor is placed close to the amplifier, the MED Connector, or the 68 pin SCSI cable.
An example of magnetic field noise caused by a nearby perfusion pump. Interference occurs in particular electrodes (an
example screen of the MED64-Basic to clearly show the disproportionate effect).
An example of magnetic field noise caused by a thermostat bath placed close to the MED64 system. A relatively large area
is affected (an example screen of the MED64-Basic to clearly show the disproportionate effect).
- The electrodes’ surfaces of the MED Probe or platinum wire is not completely immersed in perfusion solution. Some parts are not
exposed to the atmosphere.
- The platinum wire is not gripped by a ground wire with a bagworm clip.
- The platinum wire is not stably fixed with a fixation screw (it is prone to staggering).
- A spike-like noise occurs at several seconds interval. A flat baseline noise is obtained when the peristaltic pump is turned off.
* The inside of the dropper is completely hydrophilic with a lot of water dropping. It is likely that the inside insulation is destroyed
every time the perfusion solution drops, and the noise from the pump is conducted. Connect the inlet pipe and the platinum
wire using a ground wire with a bagworm clip. When the noise disappears, the inlet dropper is identified as the cause (this
procedure cannot be used for the outlet dropper because an air layer is mixed).
* Check whether the tip of the inlet pipe is too close the platinum wire to not putting hydraulic pressure when the perfusion
solution drops.
* Check whether air entrainment occurs in the inlet dropper and bubbles enter the MED Probe chamber periodically to compress
the platinum wire.
20 ms
25 µV
20 ms
25 µV
Summary of Contents for MED64-Entry
Page 1: ...MED64 Entry Manual ...
