SCOM-100, User guide

12

The circuit displayed on the center uses an external shunt resistor (~51.3 Ω) wired parallel to the input in order to measure current signals (e.g. 0-20/4-20mA).

The circuit displayed on the right side of the page uses an external resistor (Rx) to measure DC voltage (Vx). Rx and Rin (2K) form a voltage divider. The following table illustrates the applicable resistor Rx values for different DC voltages:

Vx

Rx

Vin

0..1V

0

0 -1V

0..5V

8K, 1/4W

0 -1V

0..30V

58K, 1/4W

0 -1V

0..60V

118K, 1/4W

0 -1V

0..100V

198K, 1/4W

0 -1V

Note: In case of low voltage measurements, use short and shielded wiring to avoid 50Hz (60Hz) line noise inteference.

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Infinite Peripherals SCOM-100 manual Vin