Analog recorders designed to accept signals that change more rapidly than a servo system can handle are known as oscillographs. The name presumably has derived from analogy with the cathode-ray oscilloscope, which is also suited for high-speed signals; indeed, much higher frequency signals can be displayed on an oscilloscope than on any recorder with moving parts. Most oscillographs fall into one of two classes: those that use photographic recording, and those that rely on pen-and-ink, electrical, or thermal writing methods. Figure 5-1 shows a representative style of multichannel oscillograph.
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