Before running any scripts that turn on the DOM High Voltage, it is a good habit to check the rates at a low voltage.

Doing this one can detect some light leaks, which might have been overlooked otherwise. The script one can use is

the rate.py script. It just checks the rates, but one can set the voltage by hand using the –v argument. One uses this script

for each DOM separately, giving the DOR-card, wire pair and A/B as resp. 2^nd, 3^rd and 4^th argument.

For example:

offeverything

dtsxinit

rate.py –v 800 0 1 B

If you want to check all the DOMs on the same time, one can use the script monitor 800 the output gets in the file:

/mnt/data/testdaq/monitor/monitor800.data.

We recommend to run this script twice per DOM at two HV settings: first at 800 V and then at 1300 V.

One expects to find rates of a few Hz at 800 V and in the order of kHz at 1300 V. If the readout is in the order of MHz one

should really worry and inspect the DOM for light leaks. In that case don’t run any other scripts turning on the HV!!

Note: to get the position of a DOM one might want to do on all; gotoiceboot; in a separate window.