Omega Vehicle Security freedom OM-550 - Manual (Page 38)

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.