Log entry time 23:16:23 on April 13, 2012

Entry number 374111

The maximum DAQ rate is around 7.5 kHz (certainly no more). No matter how high your 
trigger rate or prescale is, the DAQ data taking rate will never be more than 7.5 kHz. Prescaling 
will help to reduce the deadtime and take data as close as possible to ~7.5 kHz. 

Also, maximum DAQ rate means the rate at which deadtime would be 100% if you could 
increase the rate as high as possible. We will never reasonably be able to run at 7.5 kHz. 

For example assume the trigger rate is ~28 kHz. Current End-of-Runs show with a prescale of 
3 and a prescaled trigger rate of roughly 9 kHz the deadtime is ~30 %. The rate CODA is 
actually accepting triggers is then ~6.3 kHz. 

With the same trigger rate a prescale of 4 equates to 7 kHz with deadtime ~15%. The rate 
CODA is actually accepting triggers is then ~6 kHz. 

To this effect, a prescaled rate higher than 7 kHz really only gains us deadtime. The same goes 
for 6 kHz unprescaled from what I have seen.