When the vacuum pump is OFF, confirm that the vacuum status
inside the spectrometer is “OK” on Instrument Check screen of the
data processing software at least once a day.
If it is “Air”, turn ON the vacuum pump and wait until the vacuum
status becomes “OK”, and then continue to run the vacuum pump at
least three more hours.
1.4 Read-out unit
The read-out unit converts the intensity of the dispersed light into the current,
and measures it.
On an emission analysis, the intensity of the light emitted from a sample
generates large fluctuation at a short time. Therefore, the method of integrating
the output current for a specified time to measure the average current value is
adopted.
(1) Photo detector (PMT)
Converts the intensity of the light dispersed by the spectrometer unit into the
current.
(2) Photo detector sensitivity controller (Attenuator)
Changes high voltage supplied to the photo detector, to control the sensitivity of it.
A high voltage generator and an attenuator are provided at each channel.
(3) Integrator
Integrates the output current from the detector.
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