213
The Tektronix 213 is a miniature portable oscilloscope introduced in 1975. It combines a 3 1/2-digit DMM and a 1MHz single channel scope in one unit. The maximum sweep rate is 0.4 microsec/div with x10 sweep magnifier. The 213 provides true RMS voltage and current measurements. It is battery or AC line powered.
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In DMM mode
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Attenuator and Input Amplifier Schematic
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GM and RMS Converter Schematic
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Battery Charger and Power Supply Schematic
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HV and CRT Schematic
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A-D Converter and Character Generator Schematic