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A spectrum analyzer is also used to determine, by direct observation, the bandwidth of a digital or analog signal. A spectrum analyzer interface is a device that connects to a wireless receiver or a personal computer to allow visual detection and analysis of electromagnetic signals over a defined band of frequencies.
The 7D11 ($2,915 in 1983) was a digital delay, the 7D15 ($3,020) was a 225 MHz counter/timer, the 7D13 ($1,105) was a multimeter, and the 7D12/M2 ($2,815) was a sample-and-hold with an analog-to-digital converter. More exotic digital plug ins used the mainframe oscilloscope as a mere display unit. The 7D01 and 7D02 were logic analyzer plug ins.
Starting with the 530 and 540 series oscilloscopes, the operator could switch in different horizontal sweep or vertical input plug-ins. This allowed the oscilloscope to be an adaptable test instrument. Later Tektronix added plug-ins to have the scope operate as a spectrum analyzer, waveform sampler, cable tester and transistor curve tracer.
Signal analyzers can perform the operations of both spectrum analyzers and vector signal analyzers.A signal analyzer can be viewed as a measurement platform, with operations such as spectrum analysis (including phase noise, power, and distortion) and vector signal analysis (including demodulation or modulation quality analysis) performed as measurement applications.
A mixed-domain oscilloscope (MDO) is an oscilloscope that comes with an additional RF input which is solely used for dedicated FFT-based spectrum analyzer functionality. Often, this RF input offers a higher bandwidth than the conventional analog input channels.
Tektronix 7854 oscilloscope with curve tracer and time-domain reflectometer plug-ins. Lower module is a mainframe of the series Tektronix TM500 and has a digital voltmeter, a digital counter, an old WWVB frequency standard receiver with phase comparator, and function generator.
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