Difference between revisions of "TAGH PMT testing"
From GlueXWiki
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After PMT leads and cables have been soldered to PCBs: | After PMT leads and cables have been soldered to PCBs: | ||
| − | *Place assembled PMTs in light-tight box and connect cables | + | *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 | *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, ramp up to 850 V | ||
| − | *Turn on Picosecond Laser (intensity scale to 1.5, freq. to 100 kHz) | + | *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 | *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 | *Ramp laser frequency to 1 MHz, 2 MHz, 5 MHz, 10 MHz | ||
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*Check for break-down voltage and frequency | *Check for break-down voltage and frequency | ||
*Report results on excel sheet, save snapshots of scope signal | *Report results on excel sheet, save snapshots of scope signal | ||
| + | |||
| + | [[Media:TAGH_pmt_tests.xlsx]] | ||
Revision as of 11:19, 11 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, 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
