The anode wires will also be read out with a latch and will
require a calibration which is very similar to the coarse cathode
calibration. The front end electronics should be pulsed at
a common voltage and several threshold settings so that a
common threshold can be set for all wires in a given chamber.
There are approximately 8000 channels of anode wire readout
giving a total of 1.2x10
data points required for
calibration.
The data stored for each anode wire is the threshold value at which the channels fire 50% of the time (8000 calibration constants). The calibration should be performed approximately monthly or on the same schedule as the fine cathode calibration.