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Method:
1.
Turn off Brewer power
2.
On the High Voltage module change jumper J2 from Pins 2-3 to Pins 1-2, and restore
Brewer power.
3.
Enter the HV command, and at the prompts, enter the PMT number, the preamp
discriminator level, the minimum, maximum and incremental voltages for the test. For the
PMT serno. and voltage settings see the Final Test Record.
WARNING:
A photomultiplier, which is subjected to a too high voltage, may lead to
irreversible damage of the PMT and/or can decrease its lifetime.
The maximum allowable voltage is PMT specific. It is therefore recommended
not to exceed the voltages for your PMT as mentioned in the Final Test
Record.
4.
The Standard Lamp is turned ON, FW#1 is put to Position 1, FW#2 to Position 0, the Iris is
opened, and the zenith prism turned to the lamp housing.
5.
Following a 5 minute lamp warmup, the test runs, and data is written to the DJJJYY.nnn file
and to a HVJJJYY.nnn file.
Table F-2
: Typical photomultiplier response output
Photomultiplier S/N 10256
Control voltage
750
761
771
782
792
803
813
824
834
845
855
866
876
887
897
908
918
929
939
950
960
971
Preamp voltage level:10
Dark Count
Wavelength 1
9
4
4
5
6
3
2
3
4
4
8
4
16883
5
27775
7
40973
6
55779
10
71077
9
86191
8
99579
17
111900
9
122532
11
131484
14
138978
MKIII OPERATOR'S MANUAL
APPENDIX F FACTORY TESTS
Ratio
10
10
15
25
11
49
20
79
46
238
168
648
374
1814
907
4466
2233
9244
3268
8442
12421
15486
22772
22477
28730
35206
27140
40844
39644
37143
Actual voltage
3
747.2
5
757.3
8
769.3
781.3
791.3
803.4
813.4
825.4
837.4
847.5
857.5
869.5
879.5
891.5
901.6
911.6
923.6
933.6
943.7
955.7
965.7
975.7
97
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