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MKIV OPERATOR'S MANUAL
98
Calculated Values at 5V:
Radiometric response for 0 to 100%RH:
Vout @0%=0.868 @75.3%=3.050 Vout = Vsupply * (0.1736 to 0.7533)
NaCl solution is 75.3%, the measured relative humidity is %
MgCl
2
solution is 32.8%, the measured relative humidity is %
LiCl solution is 11.3%, the measured relative humidity using is %
Dry nitrogen solution is 0%, the measured relative humidity is %
The HV test determines the optimum high-voltage setting for the PMT.
This test requires access to the High voltage module and the front of the Main Electronics Circuit
Board.
Measurements of the apparent light intensity of the quartz-halogen (standard) lamp are taken
through slitmask positions 1 and 2 (dark count, and wavelength 1) for a range of high voltages.
Prior to starting the test, locate shorting plug J2 on the High Voltage Module.
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 Preamp voltage level:10
Control voltage Dark Count Wavelength 1 Ratio Actual voltage
750 9 10 3 747.2
761 4 10 5 757.3
771 4 15 8 769.3
782 5 25 11 781.3
792 6 49 20 791.3
803 3 79 46 803.4
813 2 238 168 813.4
824 3 648 374 825.4
834 4 1814 907 837.4
845 4 4466 2233 847.5
855 8 9244 3268 857.5
APPENDIX F FACTORY TESTS
Содержание BREWER MK IV
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