These consists of 4 LeCroy 1877 multi-hit TDCs which have an intrinsic resolution of 0.5nsec/channel, and have the capability to be programmed so as to trigger on either the leading and/or the falling edges of the input ECL signals. These TDCs can also be programmed to run in either common-stop or common-start modes. Finally the integration time of these devices can be set by software up to 10 microseconds.

During the July-September commissioning period the E-counter TDCs were set to run in common-stop mode. both the leading and falling edges of the pulses were recorded, and the integration time was set to 2microseconds. We further programmed the device so as to record 8 events per channel (i.e. up to 4 leading and falling edges).

In order to determine the operational voltages for the E-counters a plateaux curve procedure was followed for each of the 384 counters. We only had time for 6 high-voltage settings. The following table cross-references the high voltage settings with the corresponding data files used in the present analysis. Each of these files contained about 500k events.