Occasionally (perhaps once a day or once a week) the camera will get in a strange mode and the images and values will be unexpected. First, try restarting NeuroPlex. If that doesn't solve the problem, try rebooting the PC and cycling the camera power. If it is convenient you might start each day with a PC reboot.
Resting Light Intensities
Measure the resting light intensities with the AC coupling time constant set to 2 seconds.
Powering Up and Down
The multiplexer may be damaged if the amplifiers are on and the multiplexer is off. Turn off the amplifiers before shutting down the computer. Turn on the computer before turning on the amplifiers. One way to achieve most of this is to leave the computer on continuously. Turn the amplifier gain down to 1X before turning off the amplifiers.
Cross-talk Between Channels
During testing using a step of light that is too large (it saturates some channels) will cause a very large crosstalk between channels.
There is always some crosstalk between channels even if no channels are saturated. Keeping the amplifier gain small (but large enough so that the noise is digitized well) will minimize this crosstalk (< 5%). Because this level of crosstalk is generally less than the noise in the measurement, we have never detected it in a real experiment.
Green Grounding Terminal
In typical installations this grounding terminal is not used. If line-frequency noise is detected, you might try connecting this ground to other grounds in the apparatus.