Forging new generations of engineers

Digital Multimeterfor reading resistance

What is a Digital Multimeter?• A digital multimeter measures AC

and/or DC voltage, resistance, and current in an electric circuit. It is highly accurate and displays an LCD number readout.

Test leads are used to connect the multimeter to the circuit to be tested.

Test Leads

Test Lead Connections - Voltage

• Plug the RED test lead into the jack labeled V/ and the BLACK test lead into the jack labeled COM (common).

The ohmmeter is used to measure the resistance of a component.

POWER CANNOT be applied to the component being tested.

The ohmmeter actually applies a small voltage and uses Ohm’s law to calculate the resistance from the measured current.

Ohmmeter

Multimeter

This section measures resistance in ohms

Choose2M200k20k2k200 ohms

Right now the leads are not touching.What does the meter read?What does that mean?

How to choose your setting

• Set the meter to the next highest value beyond what you are testing.

• IE: you think you have a 330 ohm resistor• What value do you set the meter to?

o 2Mo 200Ko 20ko 2ko 200

• To measure a 220K Ohm resistor, what setting do you use?

• 200K?• What does the meter on the

right read at the 200K setting?

A setting of 2M gives a reading of .222MΩ =222K Ω which is within the tolerance for a 220 Ω resistor

Choose2M200k20k2k200 ohms