Multichannel Systems MEA1060-Up-BC Manual - Manual (Page 48)

MEA Amplifier with Blanking Circuit for Upright Microscopes
48
Due to the higher electrode impedance, the maximum input voltage of the MEA1060-BC
amplifier is exceeded when applying a 100 μA pulse, and a proper operation is not possible.
Possible causes:
? You use voltage stimuli with a higher amplitude than +/- 5 V.
 Multi Channel Systems recommends not to exceed the maximum recommended stimulus
input range of +/- 5 V (see Technical Specifications in the Appendix). Please adjust the amplitude
of the stimuli used.
? You use current driven stimulation, and you have started the stimulation before selecting
a stimulating electrode in MEA_Select. In this case, the stimulus generator sends the current
into the open circuit of the amplifier. This is not an allowed operation.
 Always start the stimulus generator after having selected a stimulating electrode in MEA_Select.
Make sure you have selected the appropriate stimulus input and downloaded the information
onto the amplifier.
? You use current stimuli and electrodes with a smaller diameter than 30 μm, or older electrodes
(with a higher impedance).
 Multi Channel Systems recommends not to exceed the maximum recommended stimulus
input range of +/- 5 V (see Technical Specifications under Appendix). To avoid this, the
stimulation with current is generally not recommended, especially not with electrodes that
have a high impedance. The impedance of electrodes with a lower diameter (or the impedance
of older deteriorated electrodes) is considerably higher, resulting in a high voltage exceeding
the input range. MCS recommends to use voltage stimuli with an amplitude in the
recommended stimulus input range to be on the safe side. For more information on
stimulation via MEA electrodes, see also the MEA manual.
6.7 Liquid Spilled onto Amplifier
Warning: Spilled liquid can damage or even completely destroy the electronics of the MEA
amplifier. Avoid it by all means.
Of course it is best to completely avoid this situation and consider the following instructions
as an "emergency measurement" only. Even with this measurement, a severe damage to the
instrument cannot be excluded. It is very important that the amplifier is not connected or used
again before repair to avoid further damage caused by corrosion. Even if the initial damage
is negligible, the additional damage inflicted by corrosion over a longer period of time can
completely destroy the electronics.
1. Immediately remove the amplifier from the power supply, that is, unplug the amplifier.
Do not connect or use it again before repair.
2. Contact your local retailer and send the amplifier to Multi Channel Systems for cleaning and
repair. Multi Channel Systems will check the device and prepare a quote for you, depending
on the work and material costs needed for repair.