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Weightec 348 Manual

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ZIE PAG 21 : SWITCH INDELING
4.1 ADJUSTING : INPUT SENSITIVITY SWITCH 1 - 3
Amplifier factor: 1x . . 8x : De digital amplifier of the 348 may be
adjusted in 8 running up steps of
Table 1 0.25 mV/V each. Setting by switches 1 up to 3, see table 1:
De highest amplification (8 x) is achieved at an input sensitivity of 0.25 mV/V.
Do not set the amplifier at a higher rate than necessary.
The setting is not very critical. Only at more than 15,000 scale divisions
external resolution some noise may occur. The number of divisions of the
selected input range is 15,000 counts, but may run up to ca. 18,000 counts.
At an improper setting of the input range it is possible to exceed the linear
range and/or the calculation limits of the A/D converter.
Exceeding the calculation limits will cause a stop of the A/D converter.
Excess of the input range over 15,000 divisions is shown in the internal display
with a “ ! ” in the first decade. In the data string a > of < appears as an
overload error message in character 4 of the string.
Attention ! The input sensitivity has to be adjusted before all other settings and adjustments !
Calculation example:
Required weighing capacity : 100 kg
Applied loadcells : 3 x 100 kg = 300 kg, 3 loadcells of 2.00 mV/V
Loadcell signal at 100 kg : 100 kg : 300 kg x 2 mV/V = 0.67 mV/V, round off upwards to 0.75 mV/V
Number of divisions : 0.67 mV/V : 0.75 mV/V x 15,000 counts = 13,400 scale divisions available
Scale division will be (1,2 of 5) : 100 kg : 13,400 divisions = 7.5 gram, round off upwards to 10 gram
4.2 ADJUSTING : ZERO SETTINGS SWITCH 4 - 5
Automatic zero setting : Switch 4 “on” sets the so called “zero track” active. This zero track keeps,
with the 348 in operation automatically and continuously in gross and net mode, the zero reading exact
at zero, as soon as the weight measuring deviates >
0.1 scale division from
the zero, with a maximum of 0.5 division and a maximum speed of 0.5 division
per second. Switch 5 too has to be “on”.
The zero track is based upon a separate digital memory, and has no
connection with the dead load compensation of the dil switches 6 - 16.
The range of the zero track is limited within - 1.3% . . . + 2.7% of the weighing
capacity, as set by the overload switches, see chapter 4.5.
These limits are valid too for the external “set zero” command: ! Z .
Automatic zero setting : With switch 5 “on” at switching on the 348, the reading will be automatically set
at switching on the 348 zero, after no motion control (high level S2), with 0.01 division accuracy.
This zero setting is based upon a separate digital memory, and has no
connection with the dead load compensation with the dil switches 6 - 16.
The range of this initial zero setting is at legally stamped scales limited from
- 5% . . + 15% of the weighing range as set by the overload switches.
For not stamped scales (switch 60 “off”) the zero setting range is extended
from -20% . . +80%.
Manual 348-2 V 3.1 Page 13 01-06-2007
Switch Input range
1 2 3 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
… 13 …


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