6R1A
The Tektronix Type 6R1A is a plug-in for the 567 oscilloscope. It replaced the 6R1. The 6R1A provides digital readout of time and voltage measurements on waveforms. The 6R1A (and the 567 in general) is oriented toward sampling measurements. The 6R1A is a counter and a comparator. To digitize analog voltages, the counter and comparator are used as a ramp-compare ADC. Card Q (Voltmeter) contains a 1MHz crystal oscillator. The counters (Card A) are made of flip-flops made of 2N1754 Germanium PNP transistors.
The 6R1A differs sightly from the 6R1, mainly in what determines the 0% zone. In the 6R1, the 0% zone is always the leftmost major division of the trace. In the 6R1A, the horizontal position of the 0% zone can be set arbitrarily.
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Front
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Left
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Right
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Top
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Bottom
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Rear
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Card A (counter)
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Card A (counter)
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Card B (div 1, 2, 5)
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Card B (div by 1, 2, 5)
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Card F (upper-limit no-go)
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Card F (upper-limit no-go)
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Card G (lower-limit no-go)
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Card G (lower-limit no-go)
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Card H (limit light driver)
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Card H (limit light driver)
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Card I (div by 10)
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Card I (div by 10)
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Card J (analog display)
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Card J (analog display)
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Card M (master gate)
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Card M (master gate)
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Card N (signal comparator)
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Card N (signal comparator)
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Card O (0% zone)
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Card O (0% zone)
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Card P (memory)
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Card P (memory)
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Card Q (voltmeter)
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Card Q (voltmeter)
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Rear Connector
