Ma Adjustment: Example For Channel 0; Measuring The Current; Fig. 8-3: Measuring The Current - Addi-Data ADDIALOG PA 358 Technical Description

Technical description
8.5.1

0-20 mA adjustment: Example for channel 0

(All channels are identically set up).
Jumper J25 is set and J26 is not set, jumper J41 is set on 0-20 mA mode.
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Write the value 000Hex on channel 0
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There must be a current of 0 mA
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Write the value 0FFFHex on channel 0
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There must be a current between 19.99 and 20.00 mA.
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Otherwise, please calibrate in this range with the adjusting potentiometer P2.
8.5.2 4-20 mA adjustment: Example for channel 0
(All channels are identically set up).
Jumper J25 is not set and J26 is set, J41 is set on 4-20mA mode
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Write the value 000Hex on channel 0
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There must be a current of 4 mA.
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Otherwise, please calibrate on 4 mA with potentiometer P1.
Write the value FFFHex on channel 0
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There must be a current between 19.99 and 20.00 mA.
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Otherwise, please calibrate in this range with adjusting potentiometer P2.
8.5.3

Measuring the current

The current in the loop can be measured with a "SHUNT"-resistor.
One digit then corresponds to a voltage jump of 1.1145 mV.
Example: If digital value = 2048, then V R ≠ 2.283 Volt
Chapter 8

Fig. 8-3: Measuring the current

PA 358
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