Siemens SITRANS FUH1010PVDX, Руководство по эксплуатации, Страница: 17 / 308

Manual Addendum
1010FMA-58
A-5
To access the Digital Damping Control using the Test Facilities Graph Screen, proceed as follows:
1. To use the Test Facilities Graph Screen you must have a working site.
2. To activate the Test Facilities Graph Screen:
z
In the main menu, scroll to the [Diagnostic Data] menu and select [Test Facilities].
z
Scroll down to [Graph], press the <Right Arrow> and highlight [Yes]. Press <ENT> to select.
z
The Test Facilities Graphic Screen will appear on the meter display as shown below.
Setting the Digital Damping Factor to a value HIGHER than the default value of 4 may be necessary in
cases where the signal to noise ratio (SN) is found to be unacceptably low (<15:1), but only if the noise
is determined to be asynchronous (i.e., not associated with the transmit or flowmeter timing circuitry)
as shown in the signal example above, where the baseline noise has a higher frequency than the true
liquid signal.
The following application conditions may require a higher Digital Damping Factor:
z
Close proximity to pressure control valves which may generate in-band acoustic noise
z
High un-dissolved gas solids content in liquid.
z
High electronic noise from variable frequency drives or other external equipment.
1482.1