4-26 | Model 933S UV Analyzer
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
DC
.
Signal Max (mV)**
Displays a value that is used by Auto-Setup to adjust the PMT signal
(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
DC
.
Display
During normal operation, these message lines display the real-time
status of the species being measured (top line) and its concentration
value (bottom line).
When an Auto-Setup is in progress, messages indicating the current
stage of the Auto-Setup are displayed on the top line. Auto-Setup mes-
sages include:
• Adjusting PMT Level
• Adjusting Lamp Pulses
• Adjusting PMT Balance
• Adjusting PMT Level
• Adjusting Lamp Pulses
• Setting Up ALC
• Off/Completed
This information is also displayed on other screens.
Green text = normal conditions.
Red text = Warning or Fault alarm active.
For details about alarms and corrective action required to reset alarms,
see “Troubleshooting and Diagnostics” in Chapter 6.
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