Siemens SITRANS FUP1010, Руководство по эксплуатации, Страница: 126 / 208

To INCREASE the Digital Damping:
1. Press the <1> key while viewing the Test Facilities Graph Screen as shown above. The
damping control [MinDamp #] will appear on the command line at the lower left-hand corner
of the screen.
Note
The number listed to the right of the command code on the screen represents the exponent
in the exponential averaging routine (digital damping), where the larger the number
represents the greater the digital averaging. Setting this exponent higher than 7 is
generally not recommended.
2. Pressing the <+> key will increase the MinDamp Factor by one unit for each key press. To
exit this mode, press the <0> key on the keypad.
①
Increased Damping Factor
Figure 10-3 Setting the MinDamp Factor
The above example shows that increasing the Digital Damping reduces asynchronous noise.
Setting the Digital Damping factor to a value LOWER than the default value of 4 may be justified
in cases where pulsating flow is present (such as from a reciprocating pump) or for the purpose
of diagnosing transient signal behavior. A pulsating flow condition that generates more than
+/- 45 degrees of phase jitter will generally cause signal correlation problems when any digital
averaging is used. In this case it may be necessary to completely eliminate the digital averaging
by reducing the Digital Damping Factor to 0.
To DECREASE the Digital Damping:
1. Press the <2> key while viewing the Test Facilities Graph Screen. The damping control
[MaxDamp #] will appear on the command line at the lower left-hand corner of the screen.
2. Pressing the <-> key will decrease the MaxDamp Factor by one unit for each key press.
To exit this mode, press the <0> key on the keypad.
Troubleshooting
10.3 Test Facilities Graph Screen
FUP1010 IP67 Portable Flowmeter
124 Operating Instructions, 02/2010, A5E02951522A Revision 01