Figure 1. Dc current - equipment setup

TB 9-4910-555-35

10. Dc Current

a. Performance Check

(1) Connect equipment as shown in figure 1.

DC POWER SUPPLY NO.2

MULTIMETER

PART OF

POWER

BOLT or

SUPPLY

CLAMP

CURRENT

DC CURRENT SHUNT

STIMULUS LOOP

PROBE

TEST

INSTRUMENT

Figure 1. Dc current - equipment setup.

NOTE

Fabricate a current stimulus loop as shown in figure 1. The

loop design should be 20 turns of No. 10 insulated copper wire

with a bundle diameter of the turns being no more than 1 inch.

The inside diameter of the loop should be 6 inches, ±1 inch.

Care should be taken to ensure that the loop does not overheat.

NOTE

Clamp current probe to stimulus loop with arrow on probe

pointing in direction of current flow.

CAUTION

While performing this paragraph, minimize the time that

current is running through the loop. High current will cause

the wire to heat, thus increasing resistance and decreasing the

loop current.

(2) Set TEST SELECT switches to 90.

(3) Press and hold TEST pushbutton until CAL appears on TI display. Release

TEST pushbutton.