Continuous Clocking

In continuous clocking mode, as soon as a row is read from the output node, the next row of pixels is shifted down to be read out. The minimum integration time is then limited by the time to read out a single row which is on the order of a 6 msec (for the 2C cameras; for the flight ACIS this is about 2.6 msec). The cost of being able to read out this quickly is the loss of all spatial resolution in the parallel transfer, or FAM `Y', direction. (Again this is explicitly for the ACIS 2C. The flight ACIS chip transfer directions in FAM coordinates are a function of which chip is being referred to.)