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Weightec 348 Manual

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11.1 INPUT AMPLIFIER SETTING TABLE 1
1 = ON (switch high) 0 = OFF (switch down)
The 348 permits the change off dil switch settings
without causing differences in the other adjustments.
Of course the value of the scale division will change,
exact in relation to the change of the input amplification.
If required the table on page 15 may be used to re-
calculate the number of these new scale divisions.
In this way readjusting of the scale with stamped weight
can be avoided.
Example calculation input sensitivity setting:
A 2 mV/V loadcell of 200 kg is applied in a scale with 100 kg weighing capacity and 50 kg dead load.
The dead load is 1/4
th
of the total 2 mV/V signal = 0.5 mV/V. This dead load signal is set back to zero with the
switches for dead load compensation (6 t/m 16). This setting has no influence on the input setting.
The remaining net weigh signal representing 0 . . 100 kg load = 0 . . 1.0 mV/V
Best choice now is to select an input setting a little bit higher as this 1.0 mV/V net signal : 1.25 mV/V,
so a reserve of 25% stays available.
With all span switches in “on” position (100 % amplification), there now are 15,000 counts available for the
selected input sensitivity of 1.25 mV/V.
From these 15,000 counts at 1.25 mV/V only 12,000 counts will be used for 1,00 mV/V signal (1.00 : 1.25) x
15,000 = 12,000 counts.
The weighing capacity of 100 kg is divided by 1,2000 counts = 0.008 kg = 8 gram per count.
For setting the real scale division this 8 gram is rounded off upwards to 10 gram by selecting the scale division
(table 3) as: x 0.01 kg.
Important !
This input amplifier with up to 8 x enlarging of the input signal, offers the opportunity to apply loadcells with
an 8 x larger capacity as required, without effecting the measuring accuracy.
Especially for weighing machines with high risks of (dynamic) overloads this is a feature that prolongs the
lifetime of the loadcells substantially.
Manual 348-2 V 3.1 Page 39 01-06-2007
Dil switch nr.
1 2 3
Input range
in mV/V
0 0 0 0 - 0.25
0 0 1 0 - 0.50
0 1 0 0 - 0.75
0 1 1 0 - 1.00
1 0 0 0 - 1.25
1 0 1 0 - 1.50
1 1 0 0 - 1.75
1 1 1 0 - 2.00
… 39 …


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