4-24 | Model 933S UV Analyzer
ALC SetPt**
The Automatic Lamp Control Setpoint signal is obtained from the
Reference PMT for each filter after an Auto-Setup is complete. These
values are updated automatically by an Auto-Setup. The Automatic
Lamp Control function adjusts the lamp pulses to maintain the Refer-
ence PMT signals to these values.
ALC Gains (mV)**
The automatic lamp-control gain setting for each filter.
Tzero**
Transmittance Zero is the PMT signal transmittance value of each
filter, with Zero gas in the sample system. It is adjusted automatically
whenever the analyzer is zeroed.
ALC On check box
ALC (Automatic Lamp Control) automatically becomes active at
the completion of an Auto-Setup. However, this function should be
turned off while performing a lamp alignment.
Checked The ALC is active.
Not Checked The ALC is disabled.
Bench Type**
The Optical Bench orientation and the filter sequence assigned to each
source lamp.
Orientation The physical orientation of the Optical
Bench:
0 = Normal (typical factory default)
The Measuring Cell is connected to the
Optical Bench on the left side of the
analyzer, when facing it.
1 = Reverse
The Measuring Cell is connected to the
Optical Bench on the right side of the
analyzer, when facing it.
Filter Sequence The order in which the filters pass in front
of the light path of the source lamps:
000 = 1-3-5, 4-6-2 (typical factory default)
001 = 3-5, 4-6-1-2 (custom applications)
010 = 1-3-4-5, 6-2 (custom applications)
011 = motorless (1-3-2)
100 = 1-3-5, 4-6-1(2) (custom applications)
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