Agilent Technologies InfiniiVision 7000A Series, Programmer'S Manual

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312 Agilent InfiniiVision 7000A Series Oscilloscopes Programmer's Guide
5
Commands by Subsystem
Introduction to
:MEASure
Commands
The commands in the MEASure subsystem are used to make parametric
measurements on displayed waveforms.
Measurement Setup
To make a measurement, the portion of the waveform required for that
measurement must be displayed on the oscilloscope screen.
Measurement Error
If a measurement cannot be made (typically because the proper portion of
the waveform is not displayed), the value +9.9E+37 is returned for that
measurement.
Making Measurements
If more than one waveform, edge, or pulse is displayed, time
measurements are made on the portion of the displayed waveform closest
to the trigger reference (left, center, or right).
When making measurements in the zoomed (delayed) time base mode
(:TIMebase:MODE WINDow), the oscilloscope will attempt to make the
measurement inside the zoomed sweep window. If the measurement is an
average and there are not three edges, the oscilloscope will revert to the
mode of making the measurement at the start of the main sweep.
When the command form is used, the measurement result is displayed on
the instrument. When the query form of these measurements is used, the
measurement is made one time, and the measurement result is returned
over the bus.
Measurements are made on the displayed waveforms specified by the
:MEASure:SOURce command. The MATH source is an alias for the
FUNCtion source.
Not all measurements are available on the digital channels or FFT (Fast
Fourier Transform).
Reporting the Setup
Use the :MEASure? query to obtain setup information for the MEASure
subsystem. (Currently, this is only :MEASure:SOURce.)
Measurement Type Portion of waveform that must be displayed
period, duty cycle, or frequency at least one complete cycle
pulse width the entire pulse
rise time rising edge, top and bottom of pulse
fall time falling edge, top and bottom of pulse