70
Scope Multimeter
Tests and Capabilities (Quick Reference)
8.2 Tests and Capabilities (Quick Reference)
The following chart identifies and describes available tests by function.
NOTE:
i
Not all the tests listed are described in this manual. This list is intended as reference only.
D
M
M
G
M
M
LS
Test
Function
a
Two Channel Lab Scope
Displays two Lab Scope channels automatically.
a
Dual Graphing Meter
Displays two Graphing Multimeter channels
automatically.
a
Ignition Probe
Measures secondary Ignition voltage 2 to 50kV. Displays
secondary ignition (kV) waveforms.
a
a
a
Volts DC
Measures direct current voltage. DC voltage is measured
through the two test leads connected to a DC circuit.
a
a
Volts DC - Average
Measures DC voltage using a filter to determine the
average voltage over a period in time. DC voltage is
measured through the two test leads connected to a DC
circuit.
a
a
Volts AC RMS
Measures the effective AC voltage, not the peak voltage
which results in measurements with higher accuracy. The
AC RMS (root mean square) voltage value can be
defined as the equivalent DC voltage of the AC voltage
measured. RMS values are commonly used in AC
electrical measurement, as they are more representative
of DC measurements.
a
a
Ohms
Measures electrical resistance (opposition to current) 0 to
4 M Ohms. Scope supplied DC current is passed through
the circuit to measure the resistance between the two
connected test leads.
a
Diode/Continuity
Measures voltage drop across a diode and continuity
through a diode. Scope supplied DC current is passed
through the diode to measure the voltage drop between
the two connected test leads. Typical setup for positive to
negative current flow - positive lead (anode +/side) and
negative (cathode -/side).
a
Frequency
Measures the number of times a signal repeats itself per
second. Used to measure frequency of signals such as
CKP, CMP and wheel speed sensors.
a
Pulse Width
Measures the on-time of various components
(e.g. components that cycle on and off like the EGR, or
canister purge).
a
Injector Pulse Width
Measures fuel injector on-time when checking for
variances when engine load is changed and/or physical
problems with the injector.
a
Duty Cycle
Measures the ratio of the pulse width to the complete
cycle width, the on-time of components that cycle on and
off like EGR, or canister purge from 0–100%.
a
a
a
Low Amps (20)
Used to measure amperage of typical devices (e.g.
ignition coils, injectors, fuel pumps) that may draw up to
20A peak (startup) when initially started. Also used to
measure parasitic draw.
