Nicolet 526: Difference between revisions
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Mechanically, the Nicolet 526 is a three-bay 5000-series plug-in. | Mechanically, the Nicolet 526 is a three-bay 5000-series plug-in. | ||
It mates with the center-bay plug-in connector. | It mates with the center-bay plug-in connector. | ||
The Nicolet 526 is made of four boards and a backplane. | The Nicolet 526 is made of four boards and a backplane which has a 40 position two sided edge connector for each board. | ||
Connection to the Tektronix mainframe is done via | Connection to the Tektronix mainframe is done via the backplane. | ||
The four boards are: | The four boards are: | ||
* ADC and Register: The SIGNAL wire from pin 23A on the plug-in interface goes to the inverting input of an LM301 opamp via a resistance of around 165 kΩ. The noninverting input of this opamp is grounded. | * ADC and Register: The SIGNAL wire from pin 23A on the plug-in interface goes to the inverting input of an LM301 opamp via a resistance of around 165 kΩ. The noninverting input of this opamp is grounded. | ||
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The printed circuit boards are two-layer. | The printed circuit boards are two-layer. | ||
The memory is an array of Fairchild 2102DC MOS 1k x 1 static RAM ICs, DIP, soldered in place. | The memory is an array of Fairchild 2102DC MOS 1k x 1 static RAM ICs, DIP, soldered in place. | ||
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* RO TRIG (violet) 26B | * RO TRIG (violet) 26B | ||
* Y LOCK IN (blue) 25B | * Y LOCK IN (blue) 25B | ||
* FID SIG (green) maybe "FID" stands for "Free Induction Decay" in NMR? 24B | * FID SIG (green) maybe "FID" stands for "Free Induction Decay" in NMR? pin 24B on the interface connector, wired to pin 33 of the board #2 (address). | ||
* SIGNAL (brown) 23A | * SIGNAL (brown) 23A | ||
* RO STUS (yellow) 23B | * RO STUS (yellow) 23B | ||