3-32 Using the Detector
When you select RC as the filter type, only three response choices are
possible (Fast, Std., and Slow). These are the time-constants associated
with those selections:
– Fast = 0.5 sec.
– Std. = 1.5 sec.
–Slow = 4.0 sec.
• Lamp Off Time (hrs) – Determines how long after the start of an
injection the lamp turns off. The timer resets at the beginning of every
injection. Typically, you can set this function to a value that is
comfortably longer than the runtime of any injection. For example, if
your longest runtime is 30 minutes, choose a Lamp Off Time selection of
2 hours. By leaving 90 minutes of idle “lamp on” time, you can easily
start another sample set without having to wait for the lamp to warm
again.
Tip: It is best to shut the lamp off only when all runs are completed. You
should program the lamp to turn off (or turn off the lamp manually) only
when you do not expect to use it for at least four hours.
• Sampling Rate – Number of data points per second that the detector
transmits to Empower or Millennium
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software.
• Offset – Level of offset, in millivolts, applied to the channel A analog
output only. It does not affect the digital data transmitted to Empower
or Millennium
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software over RS-232.
• Gain – Gain value applied to the PMT. The choices are 1, 10, 100, and
1000.
• Attenuation – Analogous to EUFS. Values from the 474 detector are
translated according to the following table. This parameter affects only
Digital time constant response settings
Empower or Millennium
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selection 2475 time constant (sec.)
30.3
50.5
10 1.0
20 2.0
40 4.0
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