Is the problem of mistery noise resolved ?

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Is the problem of mistery noise resolved ?

Post  mdipaolo on Tue Apr 28, 2009 6:52 pm

I noticed that using all the channels (1,2,3,4,5 and 6) of the laser lab the noise of the pre-amp frascati was high and in output a sinusoidal signal of 600 kHz of 3Vpk.

At this point i put the pre-amp in the laser lab and connected a BNC long cable (not using nothing channels) to the output. The long cable passes between the doors. The power supply is outside of the laser lab. (i need a better bnc cable)
In the following the noise of the pre-amp measured:

In the output i noitced only a DC signal of around -2.8 V. More o less the noise would appear OK. In the followinf the comparison with the noise of the pre-amp outside the laser lab

After i mesured the dark noise of the PDs:

(in loop)

(out loop)

The DC level of the pre-amp can be boring ? I think that the noise level in this case is good, pre-amp noise is around 1 1 kh around 0.9 V.
I did this measure with chiller, laser and AOM on.


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