Technical data

6.00
A
m
A
COM
V
Ω
V
Power
Supply
6V
Voltmeter leads connected in parallel
with resistor being measured.
Figure P-2
Ammeter
To measure current, break the circuit where you want to take the reading. Set the meter to AC or DC
current depending on the source being tested. Plug the test lead into the correct jack to measure the
expected current.
Note: Most meters have a separate jack that needs to be used to measure current from 0 to 200mA
and from 200mA to 10A or sometimes 20A.
Insert the meter in series or “in line” with the circuit to be measured by placing the red test lead on the
positive polarity point and the black lead on the negative polarity point (see Figure P-3). Similar to the
voltage, the correct current range needs to be selected. Start by selecting the next range higher than
the expected reading. If the meter ever reads “0” when an actual reading should be present, check the
fuse for the 200mA port.
5
12.00
A
m
A
COM
V
Ω
mA
Power
Supply
12V
Ammeter leads connected in series
with the circuit being measured.
Figure P-3
1000
A
m
A
CO
M
V
Ω
Ω
Remove power from the circuit prior
to takin
g
resistance measurement.
Figure P-4
Ohmmeter
To test for resistance, first remove the power from the circuit component to be tested. This prevents
the meter from becoming damaged by the source. After ensuring that all power is off, set the dial to the
resistance function. Select the appropriate range on the dial. Remove the component to be measured
from the circuit (This prevents false readings from any other components in the circuit). Make sure the
test leads are plugged into the correct jack to measure resistance. Connect your test leads to the
component and take the reading.
It's important that you have good contact between the test leads and the component being tested. Dirt,
oil and poor test lead connection can undesirably alter resistance readings.