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Theory of Operation
8
1100 Series FD Reference Manual
271
Photomultiplier Tube Voltage Supply
The photomultiplier tube needs an adjustable working voltage between -240 V
and -820 V for correct operation. The PMT gains are realized by variable
operating voltage of the device. A regulated pulse width modulator is used to
generate the high voltage by switching the 24 V rail to a transformer. The
feedback loop has a D/A-converter-controlled base voltage to set the desired
output voltage. The PMT output delivers a current signal which is proportional
to the detected light and to the actual working voltage.
Figure 92
Block diagram FLF
Flash Lamp
Supply
PMT voltage
Supply
EX Motor
Driver
Cell
Detection
Read/Write
Port
Leak Sensor
circuit
A/D Converter
16-bit
Lamp Cover
Safety Switch
Reference
Diode
Signal
conditioning
&gain
Pre-Amplifier
&signal
conditioning
Board Temp
Sensor
PMT
Leak
Sensor
Flow
Cell
EX Mono-
chromator
FLL
Board
FLM
Board
FLF
FLM
Board
Содержание 1100 Series
Страница 1: ...s1 Agilent 1100 Series Fluorescence Detector Reference Manual Agilent G1321A Asset 304025 ...
Страница 12: ...12 1100 Series FD Reference Manual ...
Страница 58: ...60 1100 Series FD Reference Manual 2 First Steps with the Fluorescence Detector ...
Страница 126: ...128 1100 Series FD Reference Manual 4 Troubleshooting and Test Functions ...
Страница 260: ...262 1100 Series FD Reference Manual 7 Introduction to the Fluorescence Detector ...
Страница 324: ...326 1100 Series FD Reference Manual 9 Introduction to the Control Module ...
Страница 340: ...342 1100 Series FD Reference Manual A Safety Information ...
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