Bedienungsanleitung Weightec 348 (Seite 11 von 53) (Englisch)

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3.2 TARE

Function : Digital zero setting of the gross weight value with 0.1 scale division

accuracy. Allowed within the complete weighing range.

Taring : With tare command: X ! N CR (= set net), or built in into a setpoint

executive code. See table 7, 2

column on page 45.

If a tare is in operation, i.e. the weight reading is net, the gross weight value

always may be requested with: X ? G CR , the tare will not be deleted.

A tare is cancelled with command: X ! G CR (set gross)

3.3 DAMPING / FILTERS

Standard filter : Digital two pole filter from 0.13 Hz up to 4.02 Hz in 8 steps. Setting by

dil-switches 49 . . 52 on the main print board, see table 2 on page 40.

Adaptive filter : This progressive filter damps down the weight movements automatically with

more force as the weight movement tends to decrease.

This results in a major improvement of the time necessary for achieving a

“standstill” and prevents for blinking up and down of the weight reading.

The increased filtering of the adaptive filter is switched off immediately

if more than ½ scale division change in the weight value is measured longer

than ½ second. Pulsating changes however are neglected by integrating

calculation of the weight values.

The adaptive filter is default “on”, but may be disabled with command : ! E 3

(off), and reset with : ! E 2 (on).

Anti pulse filter : Effective only for the weight values sent to the setpoint comparator.

Pulsating weight changes are recalculated, based upon the steepness of the

pulse and the remaining increase of weight after a pulse. In this way the

kinetic energy of the pulse will be levelled, resulting in a correct weight value

that is used by the setpoint comparator.

Short “overshoots” of the measured weight value is strongly prevented by this

filteren, premature switching off of the setpoints is prevented.

The anti pulse filter is switched on with the start command code of the

setpoints, see table 8, last column on page 46.

Inflight filter : Effective only for the weight values sent to the setpoint comparator. This filter

measures continuously (426 x per second) the speed of the weight increase.

From the derivatives of these range of measured values, it calculates the

kinetic energy, pushing on the scale. The weight value of this energy is added

to the actual value, causing a premature cut off of the setpoints.

In this way course filling may last longer, and fine dosing time will be shorter,

since overshoot risk is strongly limited, it will speed up the capacity of filling.

The anti pulse filter system is incorporated in the inflight filter.

Since these filters are measuring continuously at high speed, a change in

weigh speed immediately will result in correction of the setpoint cut off values.

The inflight filter is switched on with the start command code of the

setpoints, see table 8, last column on page 46.

Manual 348-2 V 3.1 Page 11 01-06-2007

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