TAGH PMT testing
From GlueXWiki
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