Measurement-computing SWITCH AND SENSE 8/8 Instrukcja Użytkownika Pobierz pdf (Strona 16)

Switch & Sense 8/8 User's Guide Functional Details

3-5

Figure 3-6 illustrates a simple connection from a +9 V battery to the relay 4 terminals. When the relay is

energized, the relay 4 NO terminal connects the battery voltage to the input 4 terminal (IP4B).

Figure 3-6. Simple battery-to relay connection

Figure 3-7 shows the schematic of this connection.

IP4

IP4B

+9 V

Figure 3-7. Schematic of battery-to relay connection

Extending the input range

You can extend the input range beyond the 5 to 30 V specified by adding an external resistor. Figure 3-8 shows

the external resistor (R

ext

The equation R

ext

= 100 * (V

– 30) calculates the resistor value for a given V

Make sure the external resistor is capable of handling the power generated by the input. Calculate the power

requirement in watts (P

) using the equation P

= R

ext

/10000.

1.6 K

ext

= 100 * (V

–

30)

= R

ext

10000

ext

Figure 3-8. External resistor added to extend input range

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Measurement-computing SWITCH AND SENSE 8/8 Instrukcja Użytkownika Strona 16