Difference between revisions of "TAGH PMT testing"

Latest revision as of 16:56, 13 October 2013

After PMT leads and cables have been soldered to PCBs:

Place assembled PMTs in light-tight box, secure its position with a cable tie, and connect cables (HV channel 0, signal1 to scope chan.1, signal2 to scope chan.2)
Verify that PMT, diffuser & attenuator stand, and Picosecond Laser are aligned
Turn on HV and check monitored current - initially set HV to 100V, then ramp up to 850 V
Turn on Picosecond Laser (intensity scale to 1.5, freq. to 100 kHz), switch safe box on top of the light-tight box
Check signals on oscilloscope, use measurement function to report min/max within the peak and integral
Ramp laser frequency to 1 MHz, 2 MHz, 5 MHz, 10 MHz
Repeat frequency scan for HV=900 V, 1000 V, 1100 V
Check for break-down voltage and frequency
Report results on excel sheet, save snapshots of scope signal

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 *Place assembled PMTs in light-tight box, secure its position with a cable tie, and connect cables (HV channel 0, signal1 to scope chan.1, signal2 to scope chan.2)
 *Verify that PMT, diffuser & attenuator stand, and Picosecond Laser are aligned
-*Turn on HV and check monitored current, ramp up to 850 V
+*Turn on HV and check monitored current - initially set HV to 100V, then ramp up to 850 V
 *Turn on Picosecond Laser (intensity scale to 1.5, freq. to 100 kHz), switch safe box on top of the light-tight box
 *Check signals on oscilloscope, use measurement function to report min/max within the peak and integral