La resistenza del segnale di uscita e il problema di adattamento dell'impedenza di uscita del generatore di corrente da 4-20 mA devono soddisfare i seguenti requisiti:
1.Secondo: I = U/R (corrente = tensione divisa per resistenza)
Quindi la tua tensione di alimentazione divisa per la resistenza interna del tuo segnale è uguale alla corrente massima che il tuo ricevitore di segnale può generare.
Inoltre, i nostri generatori di corrente hanno anche una certa resistenza interna.
2.Così secondo :
Tensione di alimentazione/(resistenza del segnale del cliente + resistenza interna del nostro generatore di corrente) = uscita di corrente costante
Poiché la tensione di alimentazione del nostro modulo è 4-35V, se la tensione di alimentazione è bassa e la resistenza interna del cliente è elevata, la corrente costante generata dal modulo non sarà sufficiente.
Di seguito sono riportati i requisiti di corrispondenza del segnale del nostro modulo:
Per l'alimentazione a 24 V, la resistenza del segnale non deve essere superiore a 1000 ohm.
Per l'alimentazione a 12 V, la resistenza del segnale non deve essere superiore a 500 ohm.
Per l'alimentazione a 5 V, la resistenza del segnale non può essere maggiore di 200 ohm.
Se la resistenza del segnale è maggiore dei parametri sopra indicati, è possibile aumentare la tensione di alimentazione o ridurre la resistenza del segnale in due modi per risolvere il problema dell'alimentazione corrente della sorgente di corrente costante. Va notato che la tensione di alimentazione non può essere aumentata oltre i 28V.
Intervallo di tensione in ingresso: DC 5-28V DC
Voltaggio consigliato: 12-24 V CC
Dimensioni: 8,5 * 7 * 4 cm/3,3 * 2,8 * 1,6 pollici
A causa del diverso monitor e dell'effetto della luce,
1 x 4-20 mA generatore di segnale
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