Actron Digital Multimeter CP7676 - Manual (Page 9)

2K 200
20M
2M
200K
20K
OHMS
750V AC
200V DC
COM V
DWELL
4
CYL
5
CYL
6
CYL
8
CYL
9
5. Connect RED and BLACK test leads
across component where you want to
measure resistance.
When making resistance measurements,
polarity is not important. The test leads
just have to be connected across the
component.
6. Turn multimeter rotary switch to
desired OHM range.
If the approximate resistance is unknown,
start at the largest OHM range and
decrease to the appropriate range as
required. (See Setting the Range on page 6)
7. View reading on display - Note range
setting for correct units.
NOTE: 2K Ω = 2,000 Ω ; 2M Ω = 2,000,000 Ω
If you want to make precise resistance
measurements, then subtract the test
lead resistance found in Step 4 above
from the display reading in Step 7. It is a
good idea to do this for resistance
measurements less than 10 Ω .
Testing for Continuity
Continuity is a specific type of resistance test
to determine if a circuit is open or closed. The
multimeter will display circuit resistance.
Resistance smaller than 10 Ω usually
indicates continuity. Continuity checks are
usually done when checking for blown fuses,
switch operation, and open or shorted wires.
To measure Continuity (see Fig. 9):
1. Insert BLACK test lead into the COM
test lead jack.
2. Insert RED test lead into the test lead
jack.
3. Turn multimeter rotary switch to 200 Ω
range.
4. Touch RED and BLACK test leads
together and view reading on display.
Display should read typically 0.2 Ω to 1.5 Ω .
If display reading was greater than 1.5 Ω ,
check both ends of test leads for bad
connections. If bad connections are found,
replace test leads.
5. Connect RED and BLACK test leads
across component where you want to
check for continuity.
View reading on display:
• Continuity - Display reading is less than
10 Ω .
• No Continuity - Display reading is greater
than 10 Ω .
Testing Diodes
A diode is an electrical component that allows
current to only flow in one direction. When a
positive voltage, generally greater than 0.7V,
is applied to the anode of a diode, the diode
will turn on and allow current to flow. If this
same voltage is applied to the cathode, the
diode would remain off and no current would
flow. Therefore, in order to test a diode, you
must check it in both directions (i.e. anode-to-
cathode, and cathode-to-anode). Diodes are
typically found in alternators on automobiles.
Performing Diode Test (see Fig. 10):
Fig. 10
Cathode
Anode
Red Black
2K 200
20M
2M
200K
20K
OHMS
750V AC
200V DC
COM V
DWELL
4
CYL
5
CYL
6
CYL
8
CYL
Fig. 9
Red Black