Next: Data Processing Up: ACIS High Speed Tap Previous: Purpose
XRCF phase I was performed with the ACIS flight instrument, but without the HRMA or the gratings. The full ACIS focal plane was illuminated with X-rays from either the EIPS or the DCM.
ACIS was run in the full frame timed exposure mode, with a 3.34 second exposure time. During most science runs, six of the CCDs were read out simultaneously. During each science run, the high speed tap was cycled through each of the devices that was on. As the high speed tap was changed, so was the TRW ID.
There are two reasons why high speed tap data are used here in favor of telemetry data. Without the limitations of the telemetry, the entire full frames can be captured, not just the events from a small window. Also, because a single science run contains data from may TRW IDs, a time filter must be applied when comparing the telemetry data to the Beam Normalization Detector data. Using High Speed Tap data eliminates this complication.
The tables presented in this section identify the data used by science run number, not TRW ID. A single science run is all of the data taken between sending the "Start Run" and "Stop Run" commands to the ACIS instrument and often includes several TRW IDs.
Table 4.21 lists the relevant TRW IDs for the data used in this section.
|120 122 123||4509||1.121||1.122||1.123||1.124||2.131||2.132||2.133||2.134||2.135||2.136|
|77 78 83 84||6399||1.025||1.026||1.027||1.028||2.037||2.038||2.039||2.040||2.041||2.042|