Actron CP7678 Betriebsanleitung PDF herunterladen (Seite 13)

250V MAX

15A MAX

FUSED

COM

DC

15A

20M

200

K

20K

2K

200

8CYL

6CYL

TACH

X10

5CYL

4CYL

8CYL

OHMS

15

A

250V MAX

15A MAX

FUSED

DC

15A

20M

200

K

20K

2K

200

8CYL

6CYL

TACH

X10

5CYL

4CYL

8CYL

OHMS

15

A

COM

13

Section 2. Automotive Testing

The digital multimeter is a very useful tool for

trouble-shooting automotive electrical sys-

tems. This section describes how to use the

digital multimeter to test the starting and charg-

ing system, ignition system, fuel system, and

engine sensors. The digital multimeter can

also be used for general testing of fuses,

switches, solenoids, and relays.

General Testing

The digital multimeter can be used to test

fuses, switches, solenoids, and relays.

Testing Fuses

This test checks to see if a fuse is blown. You

can use this test to check the internal 15A

fuse inside the digital multimeter.

• If you hear tone - Fuse is good.

• If you don’t hear tone - Fuse is blown

and needs to be replaced.

NOTE: Always replace blown fuses with

same type and rating.

Testing Switches

This test checks to see if a switch “Opens” and

“Closes” properly.

Fig. 16

Red Black

Typical "Push"

Button Switch

To test Switches (see Fig. 16):

1. Insert BLACK test lead into COM test

lead jack.

2. Insert RED test lead into

test

lead jack.

3. Turn multimeter rotary switch to

200

function.

4. Touch RED and BLACK test leads to-

gether to test continuity.

Listen for tone to verify proper operation.

5. Connect BLACK test lead to one side of

switch.

6. Connect RED test lead to other side of

switch.

Listen for tone:

• If you hear tone - The switch is closed.

• If you don’t hear tone - The switch is

open.

7. Operate switch.

Listen for tone:

To test Fuses (see Fig. 15):

1. Insert BLACK test lead into COM test

lead jack.

2. Insert RED test lead into

test

lead jack.

3. Turn multimeter rotary switch to

200

function.

4. Touch RED and BLACK test leads to-

gether to test continuity.

Listen for tone to verify proper operation.

5. Connect RED and BLACK test leads to

opposite ends of fuse.

Listen for tone:

Fig. 15

Red

Black

Fuse

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 35 36

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