Escalade ESV RWD V8-6.2L (2010)
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
Testing Ground and Low Reference Circuits
Testing Ground and Low Reference Circuits
Because a test lamp can light with up to 200 ohm in a ground or low reference circuit they are not recommended to be used for this type of test. A low
impedance test lamp can light and indicate the circuit is good when there is as much as 20-30 ohm present, while a high impedance test lamp can light
with up to 200 ohm present in the circuit. This is why the Digital Multi-Meter (DMM) is used when validating a ground or low reference circuit
continuity.
When using the DMM there are many vehicle conditions that can affect the ground and low reference continuity testing. If these conditions are not met, a
ground or low reference circuit test can fail on a good circuit. This may cause longer diagnosis time and incorrect component replacement.