MiniPrototype CAEN V792 Calibration
I injected a signal into the Drift chamber preamps and read it out using the CAEN V792 ADC.
12/11/07
50 dB attenutation signal
The preamp input signal of XX mV was attenutated 50 dB. The preamp output from both drift chambers was sampled with the ADC. Both Drift chambers HV's were unplugged and the preamp was powered to 5.8 V.
Run 192
Run 193. Preamp HV off
Run 194 Preamp Off, trigg rate changed from 10 Hz to 60 Hz
Run 195 Preamp Off, trigg rate changed from 10 Hz to 550 Hz
Run 196 Preamp Off, trigg rate changed from 10 Hz to 250 Hz
Run 197 Preamp Off, trigg rate changed from 10 Hz to 300 Hz
7 mV Signal
Here is a scope picture of the signal coming out of the preamp and going into the ADC (Blue) as well as the integration gate used. The signal is about 7 mv as shown below. There is a 2 mv peak to peak noise level which has structure.
The data was then collected using coda and recorded as run #189. A histogram of channel #1 is shown below.
20 mV signal
Reducing the attenuation, a 20 mV signal was sent into the ADC.
The data was then collected using coda and recorded as run #190. A histogram of channel #1 is shown below.
100 mV signal
Reducing the attenuation, a 100 mV signal was sent into the ADC.
The data was then collected using coda and recorded as run #191. A histogram of channel #1 is shown below.
Calibration
Plastik's output is going into channels 1-7 and Metalicas output into 10-16. Drift Chamber High Voltage is off and preamp is powered to 5.8 volts. The post amp is not being used.
| Input (mV) | Chan 1 | Chan 2 | Chan 3 | Chan 4 | Chan 5 | Chan 6 | Chan 7 | Chan 8 | Chan 9 | Chan 10 | Chan 11 | Chan 12 | Chan 13 | Chan 14 | Chan 15 | Chan 16 |
| 0 | ||||||||||||||||
| 7 | ||||||||||||||||
| 20 | ||||||||||||||||
| 100 | 1498 |