Signal Channels - Thermo Scientific VH-D20 Operating Manual

Filter Constant

6.10.4 Signal Channels

CAD_1
Background current
Gas regulator pressure
Evaporation tube temperature
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual
The filter constant is applied to the output current to electronically
reduce the baseline noise during the analysis.
When setting a filter constant, observe the following:
• A small filter constant, such as 0.2 seconds, removes little baseline
noise.
• A large filter constant, such as 10.0 seconds, smoothes the baseline
significantly.
The following signal channels are available for the detector:
The signal channel is available for data acquisition.
• The signal channel displays the background current of the detector
during data acquisition without autozero or filter constant applied.
• It is recommended to always record the background current signal
channel.
• If a problem occurs, the information from the signal channel can
provide helpful information to identify and eliminate the source for
the problem.
• The signal channel records and monitors the nebulizer gas pressure
during data acquisition.
• It is recommended to record the signal channel for troubleshooting
purposes.
• For proper gas pressure regulation, or if baseline noise or poor
precision occurs, the information from the signal channel can
provide helpful information to identify and eliminate the source for
the problem.
• The signal channel records and monitors the actual temperature of
the evaporation tube during data acquisition.
• It is recommended to always record the evaporation temperature
signal channel for troubleshooting purposes.
• If a problem occurs, the information from the signal channel can
provide helpful information to identify and eliminate the source for
the problem.
6 • Operation
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