LOOP CURRENT ADJUSTMENT (cont)

TM 11-5805-387-34-2

PROCEDURE

INDICATION

NOTE

For one given setting of the LOOP 1 ADJ or LOOP 2 ADJ potentiometers, it may not be possible

to adjust both the 20 mA and 60 mA loop currents within tolerance. In this case, adjust each loop

for the current to be used during operation (20 mA or 60 mA). Disregard the other current

adjustment.

1. Adjust LOOP 1 ADJ potentiometer A5A2R15

60 mA +5

2. Set DC LOOP NO. 1 current switch to 20MA.

20 mA +5

Go to 3

3. Readjust LOOP 1 ADJ until multimeter

reading is correct.

4. Connect multimeter's positive lead to pin A

of DC LOOP NO. 2 DX RCV/PONY connector

J7. Connect ground lead to pin C of J7.

5. Adjust LOOP 2 ADJ potentiometer A5A2R6.

60 mA +5

6. Set DC LOOP NO. 2 current switch to 20MA.

20 mA +5

Go to 7

7. Readjust LOOP 2 ADJ until multimeter

reading Is correct.

8. Set ON/OFF switch to OFF. Disconnect test

setup.

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