Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 74)

Operation Model 4020
Teledyne Analytical Instruments 56
<Escape> Use Escape to move back to the Analyze Mode. Note that
the analyzer will now automatically switch analysis
ranges as the concentration rises above or below the
range limits.
4.6.14 Digital Filter Setup
The Model 4020 analyzer has the option of decreasing or increasing
the amount of filtering on the detector signal. This feature enhances the
basic filtering done by the analog circuits by setting the amount of
digital filtering applied by the microprocessor. The digital filter setup
function is accessed from the MAIN MENU. To set the amount of
digital filtering:
<▲▼> From the MAIN MENU, scroll to the FILTER function
using the UP/DOWN keys.
<Enter> Press to activate the FILTER function.
Press again to move to the Filter index field.
<▲▼> Use the UP/DOWN keys to increment or decrement the
amount of filtering to be applied by the microprocessor.
This index can be adjusted from 0, minimum digital
filtering, to 7, maximum digital filtering. The default
setting is 4 and that should suffice for most applications.
In some applications where speeding the response time
with some trade off in noise is of value, decrease the
value for the digital filter. In applications where the
signal is noisy, increase the value. Decreasing the digital
filter index will result in a slower response time.