Scope Multimeter General Reference
132
12.11.5 Glossary of Common Terms
bar x 14.5030 = psi
bar x 100.0000 = kPa
bar x 29.5300 = inHg (60°F)
kPa x 0.1450 = psi
kPa x 0.0100 = bar
kPa x 0.0102 = kg/cm²
kPa x 0.295299 = inHg
kg/cm² x 98.0700 = psi
kg/cm² x 0.9807 = bar
kg/cm² x 14.2200 = kPa
inHg (60°) x 0.0333 = bar
inHg (60°) x 3.3770 = kPa
inHg (60°) x 0.0344 = kg/cm²
inHg x 25.4 = mmHg
mmHg x 0.003994 = inHg
Temperature Units
(Symbol) / Description Conversions
(°C) degree Celsius °C = 0.556 x (°F - 32)
(°F) degree Fahrenheit °F = (1.8 x °C) + 32
Time Units
(Symbol) / Description Equivalents
(µs) microsecond 1 µs = 0.000001 of a second
(ms) millisecond 1 ms = 0.001 of a second
(s) second 1 s = 1000 ms
Duty % to Dwell Conversions
Duty Cycle Dwell
% 4 cyl 6 cyl 8 cyl
10 9.0 6.0 4.5
20 18.0 12.0 9.0
30 27.0 18.0 13.5
40 36.0 24.0 18.0
Pressure Conversions
50 45.0 30.0 22.5
60 54.0 36.0 27.0
70 63.0 42.0 31.5
80 72.0 48.0 36.0
90 81.0 54.0 40.5
100 90.0 60.0 45.0
Term / Abbreviation Description
AC
Alternating Current - electrical current that switches polarity at
regular intervals.
Aliasing
An effect that causes an incorrect signal to be displayed and/or
causes a trigger to malfunction, due to the input signal
exceeding the sample rate of the scope.
Amperage The strength of an electric current, expressed in amperes
Amplitude
Vertical magnitude (level or position) of a signal, or the varying
quantity from its zero value.
Buffer An electronic reservoir for temporary storage of data
Cursor
Onscreen markers used to measure time, amplitude and
frequency
Coupling AC
Function used to subtract the average value of a signal so that
small variations can be displayed in the waveform.
DC Direct Current - electrical current that flows in one direction only
Delta Difference in time between two events.
Dropout
An intermittent or unwanted, vertical fall in a signal to zero that
may cause an undesired result.
Duty cycle
Measurement of the length of a signals on time. Specified as a
percentage (ratio), of the total cycle time.
Dwell
Used to measure a signals on time in degrees of dwell.
Commonly used to measure mixture control solenoids on
carbureted feedback engines and specified in duty cycle %.
Dwell 60
Measurement of the length of a signals on time displayed on a 0
to 60 degree scale. 0° = 0%; 30° = 50%; 60° = 100%.
Duty % to Dwell Conversions
Duty Cycle Dwell
% 4 cyl 6 cyl 8 cyl
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