OM-550
u
33
u
4.14.3 MATCHING A CURRENT TRANSDUCER
Use one resistor to develop the necessary voltage at the input:
R1
V
OM-550 INPUT
I
TRANSDUCER
OUTPUT
+
-
Figure 4-9
V
= OM-550 maximum input voltage
=
2.0000
VDC
=
R1
*
I
I
=
1/2
transducer's maximum output current
R1
=
2 /
I
The 4-20 mA Current Probe uses this technique (with
R1=100
Ω
Ω
) to convert a 4-20 mA
current to a 0.4-2.0 VDC signal.