Current measurements are different from the other measurements made with a DVOM. Current measurements are made in series, unlike voltage or resistance measurements, which are made in parallel. The entire circuit being measured flows through the meter. Also, the test leads must be plugged into a different set of input jacks on the meter.
To perform a current test (figure 6-5):
1. Turn power to the circuit OFF.
2. Cut or unsolder the circuit, creating a place where the meter probes can be inserted.
3. Select amps DC.
4. Plug the black test probe into the “Com” input jack. Plug the red test probe into the 10 amp or 300 milliamp input jack, depending on the expected value of the reading.
5. Connect the probe tips to the circuit across the break, as shown, so that all current will flow through the meter. This creates a series connection.
6. Turn the circuit power ON.
7. View the reading. Be sure to note the unit of measurement. If the test leads are reversed, a negative (-) sign will show in the display.
