On 19/11/2018:

During the vacuum test - see eLog entry #43 we performed noise tests on the preamplifiers with no S2 detector connected

First we performed a "tabletop" test - the preamplifiers were not connected to the chamber.

Preamp I for the near S2 is connected to RAL modules (reading left to right): X, XII, XIII, R, S, Q, U, and W, via long (~5m) preamp - ICU cables 13, 14, 15, and 16

Preamp II for the far S2 is connected to RAL modules (reading left to right): I, II, XI, IV, V, VI, VII, VIII, via long (~5m) preamp - ICU cables 0, 1, 2, and 3

We powered preamps I and II with + and - 15V. The power supply shows the correct currents drawn: ~1.5A for +ve and ~0.75A for -ve

We found our test 16 pin cables #45 had a dead channel 0, we switched to cable #46 which shows all 8 channels working.

We found the following dead channels on the RAL modules:

We mounted preamps I and II to the top of the chamber. We mounted preamp I on the far S2 mount and preamp II on the near S2 mount, however we were not connecting to the S2's and so continued with the electronics tests.

Now we saw the following dead channels on the RAL modules:

We checked the signal to noise ratio for RAL X CH0:

The input pulser amplitude = 50mV, the RAL analogue amplitude = 950 mV, the RMS noise = 40mV. The S/N ~4.2%.

We stopped tests for the day.