DFR
Disturbance recorder
Recorder that captures analogue waveforms and binary signals before and after a trigger for fault analysis.
SLD / Schematic
Symbols · OSC
Oscilloscope
Instrument that displays the waveform of a signal against time, drawn with a waveform inside the instrument outline.
In plain English
What does Oscilloscope mean?
An oscilloscope displays how a voltage or current changes over time. In drawings it appears in test set-ups, laboratory panels and commissioning procedures, with its probe points shown so readers know exactly where waveforms are to be captured.
A simple example
The symbol does not show probe type or reference. Connecting an earth-referenced scope ground lead to a live point in a power circuit can short the circuit, so differential probes or isolated channels must be specified in the procedure rather than assumed from the symbol.
What the drawings help you do
Identify the probe reference point for each channel. Check whether differential probes are required. An oscilloscope shows a waveform shape; a disturbance recorder stores triggered records for later analysis.
This particular reference
Instrument that displays the waveform of a signal against time, drawn with a waveform inside the instrument outline. An oscilloscope shows a waveform shape; a disturbance recorder stores triggered records for later analysis.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams
Schematic · OSC
What it represents
An oscilloscope displays how a voltage or current changes over time. In drawings it appears in test set-ups, laboratory panels and commissioning procedures, with its probe points shown so readers know exactly where waveforms are to be captured.
The symbol does not show probe type or reference. Connecting an earth-referenced scope ground lead to a live point in a power circuit can short the circuit, so differential probes or isolated channels must be specified in the procedure rather than assumed from the symbol.
How to read it
- Identify the probe reference point for each channel.
- Check whether differential probes are required.
Information to show or reference
- Mark probe points
- State probe type
- Note bandwidth if relevant
A distinction that matters
An oscilloscope shows a waveform shape; a disturbance recorder stores triggered records for later analysis.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEC graphical symbols for diagrams
IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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