11
Resistance by which the zero adjustment of
±
0.25 mV/V(
±
500
μ
st) or more is set can be requested by
the undermentioned formula.
Rz
＝
1
E
T
×
K
×
10
3
Rz
＝
Resistance for compensation(k
Ω
)
E
T
＝
Tare weight(Initial load)(mV/V)
K
＝
146
The table below shows resistance for compensation corresponding to the input conversion strain.
Resistance value(Rz)
Input conversion strain
When the bridge resistance is 350
Ω
μ
st
mV/V
Calculation value
Approximate value(E96)
200
0.1
68.5 k
Ω
68.1 k
Ω
400
0.2
34.2 k
Ω
34.0 k
Ω
600
0.3
22.8 k
Ω
22.6 k
Ω
800
0.4
17.1 k
Ω
16.9 k
Ω
1000
0.5
13.7 k
Ω
13.7 k
Ω
1200
0.6
11.4 k
Ω
11.5 k
Ω
1400
0.7
9.78 k
Ω
9.76 k
Ω
1600
0.8
8.56 k
Ω
8.66 k
Ω
1800
0.9
7.61 k
Ω
7.68 k
Ω
2000
1.0
6.85 k
Ω
6.81 k
Ω
2200
1.1
6.23 k
Ω
6.19 k
Ω
2400
1.2
5.71 k
Ω
5.62 k
Ω
2600
1.3
5.27 k
Ω
5.23 k
Ω
2800
1.4
4.89 k
Ω
4.87 k
Ω
3000
1.5
4.57 k
Ω
4.53 k
Ω
3200
1.6
4.28 k
Ω
4.32 k
Ω
3400
1.7
4.03 k
Ω
4.02 k
Ω
3600
1.8
3.81 k
Ω
3.83 k
Ω
3800
1.9
3.60 k
Ω
3.60 k
Ω
4000
2.0
3.42 k
Ω
3.40 k
Ω
4200
2.1
3.26 k
Ω
3.24 k
Ω
4400
2.2
3.11 k
Ω
3.09 k
Ω
4600
2.3
2.98 k
Ω
2.94 k
Ω
4800
2.4
2.85 k
Ω
2.87 k
Ω
5000
2.5
2.74 k
Ω
2.74 k
Ω
4
−
3
−
2. Confirmation of initial load
Please confirm it by the following procedure when an initial load (tare weight) is uncertain.
1
Please prepare the digital voltmeter which can read 0.1mVDC.
2
The voltage (power supply voltage of the bridge) between A and C of this unit (C is minus) is
measured.
3
The voltage (input potential) between D and B of this unit (B is minus) is measured.
4
The input conversion value of an initial load is obtained by the undermentioned formula.
If the obtained value is “
＋
polarity”, an initial load is plus, and if “
−
polarity”, an initial load
is minuses. Mount the resistance according to the paragraph 4
−
3
−
1.
(Initial load input conversion value)
＝
(Input voltage)
(Power supply voltage of the bridge)
Содержание CSA-521
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