Metalica TestPulseoutput 12-20-07
I test the DC preamp + postamp output using a pulse generator to create a 40 mV levelpulse that was 10 ns wide in order to simulate a pulse from the drift chamber proto-type.
This time we used Metalica but the results are not so different.
The bottom line appears to be that we get a x4 attenuation and not a net amplification deispite our efforts the change the configuration for the better. We also note that channels 1-11 of the postamp proto type attenuate by a factor of four but channels 12-16 have a signal independent of the input.
The voltage was changed
We observed the ouput of a test pule injected into the preamp for several preamp voltage setting. The top (purple) trace is the injected pulse and the bottom (torquoise) trace is the output from the POSTamp.