Basic Digital Multimeter Requirements

Basic Digital Multimeter Requirements

Digital Multimeter (DMM) Basic Requirements

Service information is validated using digital multimeters that meet or exceed the following requirements. Using a multimeter that does not meet these basic requirements may give inaccurate readings which could lead to an incorrect diagnosis.

Display and Settings
1. Four digits displayed
2. Voltage, amperage, resistance, frequency, diode test settings, and min-max function
3. Display positive and negative values

Voltage
1. Have at least 10 Mohm input impedance
2. Test a DC voltage range of 0.1-1000 V.
3. Test an AC voltage range of 0.1-1000 V.

Amperage
1. Test a DC amperage range of 0.1µA-10 A.
2. Test an AC amperage range of 0.1µA-10 A.

Resistance

Test a resistance range of 0.1 ohm-40 Mohm and displays infinite for a value greater than 40 Mohm (O.L. (Over-load))

Frequency

Test for a frequency range of 0.5 HZ-199 K HZ

Diode Test
1. Apply at least 1 mA when performing the diode bias test
2. Display the break over voltage drop (0-3 V) of a forward biased diode
3. Display infinite (O.L. (Over-load)) when a diode is reverse biased

Min-Max Readings
1. Can update at a 1 ms sample rate
2. Saves and displays minimum and maximum values