Testing Procedures - Matco Tools ADMM50 Operating Instructions Manual

25.
15A Input Jack. For red test lead probe connection when
measuring high DC current (up to 15 amps only).
26.
DWELL ANGLE, MS °C, °F, BAT, ACmA/DCmA, CLAMP
CURRENT, RPM and COP Input Jack.
27.
Liquid Crystal Display (LCD): Displays results of tests or
measurements.
Preparation and Caution Before Use
Inspect the Digital Automotive Tester for damage to the case.
Do not use if cracked, distorted, excessively dirty or any
abnormal condition exists.
Inspect the test leads for damage. Check for cracked
insulation, broken or damaged probes, loose or bent probe
pins. Do not use if any abnormal condition exists.
Set the Function/Range Selector Switch to the proper range
BEFORE taking measurements. If the range/function must
be switched during a test, ALWAYS remove the test leads
from the circuit being measured before switching settings.
To avoid possible electric shock, instrument damage, and/or
equipment damage when taking voltage or current
measurements, DO NOT exceed the maximum value of the
selected range.
If the tester is used near high noise Radio Frequency (RF)
generating equipment (spark plug wires, ignition coils or
alternator), the display may become unstable or indicate
large errors. If you obtain erratic readings during use, isolate
the tester as far away as possible from these components.

TESTING PROCEDURES

A. AC/DC VOLTAGE MEASUREMENT
To avoid possible electric shock, instrument damage
and/or equipment damage, DO NOT attempt to measure
voltages ABOVE 600V AC/DC or take measurements if the
voltage is unknown. 600V AC/DC between the COM and V
jacks is the maximum voltage that this instrument is
designed to measure. The "COM" terminal potential should
not exceed 300V AC/DC measured to ground.
This tester displays AC voltage measurements as True Root
Mean Square (RMS) values (the "effective" or "nominal" voltage).
The RMS value of an AC voltage is equivalent to the DC voltage
that would yield the same power dissipation when applied to a
load resistor. True RMS readings are accurate for sinusoidal
waves and other wave forms without DC offset ( square waves,
triangle waves, staircase waves, etc.).
WARNING
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