Scope Multimeter Tests and Capabilities (Quick Reference)
100
12.3 Tests and Capabilities (Quick
Reference)
The following chart identifies and describes available tests by function.
Not all the tests listed are described in this manual. This list is intended as
reference only.
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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.
aaaVolts DC
Measures direct current voltage. DC voltage is
measured through the two test leads connected to a
DC circuit.
aa 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.
aa 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.
aa 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%.
aaaLow 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.
aaaLow Amps (40)
Used to measure amperage of typical motors and
devices that may draw up to 40A peak (startup) when
initially started.
aaaLow Amps (60)
Used to measure amperage of larger motors and
devices that may draw up to 60A peak (startup) when
initially started.
a MC Dwell (60)
Measures carburetor Mixture Control Solenoids (0–
60°). The duty cycle of the solenoid is expressed in
the dwell angle of a 6 cylinder engine: 100% = 60
deg.
a MC Dwell (90)
Measures fuel system Mixture Control Solenoids (0–
90°). The duty cycle of the solenoid is expressed in
the dwell angle of a 4 cylinder engine: 100% = 90
deg.
aa100 PSI Vacuum
Used to measure vacuum up to 20 in.Hg,
using the 0–100 psi transducer.
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Test Function
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