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PicoScope 6 User Guide
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Copyright 2006 Pico Technology Limited. All rights reserved.PSW044-2.0
9
Reference
This is where you can find detailed information on the workings of PicoScope.
Measurement types
Trigger timing
Keyboard shortcuts
Glossary
9.1
Measurement types
The Edit Measurement dialog allows you to select one of a range of measurements
that PicoScope can calculate for the selected waveform. Here is a list of the available
measurements:
AC Volts: The root mean square (RMS) value of the AC component of the
waveform. This measurement subtracts any DC offset from the
waveform. It is equivalent to a ripple measurement.
Burn Time: For a secondary ignition waveform, the duration of the spark.
Burn Voltage: For a secondary ignition waveform, the voltage across the spark
gap during the burn time.
Crank RPM: The turning rate of the crankshaft, as measured by the
crankshaft sensor. Expressed in revolutions per minute.
Cycle Time
:
PicoScope will attempt to find a repeated pattern in the
waveform and measure the duration of one cycle.
DC Volts
:
The mean value of the waveform.
Duty Cycle
:
The amount of time that a signal spends above its mean value,
expressed as a percentage of the signal period. A duty cycle of
50% means that the high time is equal to the low time.
Dwell Angle
:
In a primary ignition waveform, dwell time converted to an
angle, using the formula:
dwell angle = (dwell time * crankshaft RPM / 60) * 360 degrees.
Dwell Time: In a primary ignition waveform, the time during which battery
current flows in the ignition coil, as the magnetic field builds up
in its winding.
Fall Time: The time the signal takes to fall from 80% to 20% of its peak
values.
Falling Rate: The rate at which the signal voltage falls, in signal units per
second. Measured between 80% and 20% of its peak-to-peak
value.
Frequency
:
The number of cycles of the waveform per second.
High Pulse Width: The amount of time that the signal spends above its mean
value.
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