4-26 | Model 931S / Model 932S UV Analyzers
K Msr**
The molar absorptivity of the gas species at the wavelengths used, for
the Measure PMT signal. Model 931S Analyzers only.
K Ref**
The molar absorptivity of the gas species at the wavelengths used, for
the Reference PMT signal. Model 931S Analyzers only.
Key Filter**
The position of the key filter, which gives the weakest signal for a
given source lamp current.
PMT Level (mV)**
The Photomultiplier Tube (PMT) gain control signal, which is based
on the signal from the PMT when the key filter is in the light path.
After a successful Auto-Setup, the value should be 7200–7400 mV
DC
.
If the PMT Level is not in this range, adjust the Lamp Max and start
another Auto-Setup.
PMT Balance (mV)**
Displays a secondary Photomultiplier Tube (PMT) gain control signal,
which adjusts the PMT gain to equalize the PMT signals when the
key filter is in the light path. After a successful Auto-Setup, the value
should be 2000–9000 mV
DC
.
Lamp Max (mV)**
The voltage to which the lamp pulse current control signal is set to, for
the key filter location, during the Auto-Setup. To ensure a PMT Level
of 7200–7400 mV
DC
after an Auto-Setup, the Lamp Max typical range is
4500–7800 mV.
Signal Max (mV)**
Displays a value that is used by Auto-Setup to adjust the PMT sig-
nal (Reference or Measure PMT) with the highest gain. The PMT
signal with the highest gain is set to SigMax when each filter is in
the light path while the Auto-Setup is in progress. SigMax should be
8000–9000 mV.
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