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NeuroPlex-II Photodiode Array Imaging System
Hardware Limitations

 

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SOFTWARE

 

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  NeuroPlex

  Turboi-SM

 

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HARDWARE
  FastCMOS-128X

 

  NeuroCMOS-DW

 

 

  NeuroCCD-SM/SMQ

 

 

  NeuroCCD-SM256

 

 

  NeuroPDA-III

 

 

 

 

 

  MacroScope-II & -IIa

 

 

  Shutter

 

 

 

 

 

  NeuroPDA-II

 

 

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Propagating population signal from the turtle visual cortex. Provided by Jim Prechtl, Larry Cohen and David Kleinfeld, Yale University and UCSD.

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Unexpected Results

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.