Switch Configurations; Zero Point Configuration - HBM RM4220 Bedienungsanleitung

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4.2 Switch configurations

INV1 positions the voltage/ current output:
D
0/10 V for 4/20 mA
 10 V for 4/20 mA
INV2 and INV3 vary the switching mechanism:
D
4 wire circuit
6 wire circuit
INV4 varies the excitation voltage:
D
5 V DC
10 V DC

4.3 Zero point configuration

For an high precision adjustment electronic needed 15 min in process.
Zero is adjustable with W2 and PT2.
zero (mV∕V) = 
This table applies for R
W2
1
2
3
4
5
6
7
8
HBM
R ⋅ 1000
bridge
 
4 ⋅ R
+R
W bridge
= 350 Ω / 87 Ω
bridge
R
W2
W
6
3,9×10
6
2,2×10
3
750×10
3
301×10
3
121×10
49900
21000
9090
Zero for R = 350 W Zero for R
bridge
mV/V
 0.020
 0.035
 0.110
 0.280
 0.710
 1.730
 4.000
 9.200
RM4220
= 87 W
bridge
mV/V
 0.005
 0.009
 0.028
 0.070
 0.175
 0.430
 1.000
 2.300
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