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PicoScope 6 User Guide

9Reference

This is where you can find detailed information on the workings of PicoScope.

Measurement types

Trigger timing 65 Keyboard shortcuts

Glossary 68

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9.1Measurement types

The Edit Measurement dialog 26 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.

PSW044-2.0

Copyright 2006 Pico Technology Limited. All rights reserved.

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Pico Macom PSW044-2.0 manual Reference, Measurement types
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PSW044-2.0 specifications

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