Controller / User Interface | 4-25
Processing Filtration
MaxT90 (sec) The time (default is 60 seconds) required
for the output signal to reach 90 percent
of the final value after a step change in the
concentration. Larger values reduce the
noise level on the output signal but, at the
same time, increase the sample response
time. Do not change this.
Sigma of Adaptive Filtering
The expected noise level for the lamps
(default is 0.00025). Do not change this.
Samples per Peak**
The number of times the PMT signal is measured while a filter is com-
pletely within the light path.
Delay (x1.6 µs)**
The time interval between when the filter becomes completely within
the light path and the first PMT signal measurement (shown as mul-
tiples of 1.6 microseconds (µs)).
Wheel Revolutions for Avg**
The number of Chopper (Filter) Wheel rotations per minute (RPM)
used to calculate its RPM during one measuring cycle.
K Msr**
Not used with Model 933S Analyzers.
K Ref**
Not used with Model 933S Analyzers.
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 2000–8000 mV
DC
.
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