Nicolet 526: Difference between revisions
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The '''Nicolet 526''' is a signal averager that is used in a modified OEMed [[5110|Tektronix 5110]] ([[5103N]]/[[D10]]) mainframe. | The '''Nicolet 526''' is a signal averager that is used in a modified OEMed [[5110|Tektronix 5110]] ([[5103N]]/[[D10]]) mainframe. | ||
The modifications performed by Nicolet include fan cooling via the bottom panel of the scope, | The modifications to the mainframe performed by Nicolet include | ||
* adding a perforated panel for fan cooling via the bottom panel of the scope, | |||
* adding a 12-pin connector on the rear panel of the scope | |||
* connected the 12-pin connector to the interface board, connector J604. | |||
The 526 has its own +5V regulated rail. | |||
An external source of +7V unregulated DC is routed from thee 12-pin rear connector to the mainframe interface board, | |||
and into the plug-in. | |||
An LM323 +5V three-terminal regulator is the source of the +5V rail within the Nicolet 526. | |||
(Even though the input is marked "+7 UNREG" on the board, it should probably be +7.5V minimum, | |||
per the LM323 datasheet.) | |||
Since the LM323 is rated for 3 amperes, it is unlikely that the plug-in sinks more than that from | |||
the "+7 UNREG" input. | |||
Mechanically, the Nicolet 526 is a three-bay 5000-series plug-in. | Mechanically, the Nicolet 526 is a three-bay 5000-series plug-in. | ||
Revision as of 18:20, 13 November 2020
The Nicolet 526 is a signal averager that is used in a modified OEMed Tektronix 5110 (5103N/D10) mainframe. The modifications to the mainframe performed by Nicolet include
- adding a perforated panel for fan cooling via the bottom panel of the scope,
- adding a 12-pin connector on the rear panel of the scope
- connected the 12-pin connector to the interface board, connector J604.
The 526 has its own +5V regulated rail. An external source of +7V unregulated DC is routed from thee 12-pin rear connector to the mainframe interface board, and into the plug-in. An LM323 +5V three-terminal regulator is the source of the +5V rail within the Nicolet 526. (Even though the input is marked "+7 UNREG" on the board, it should probably be +7.5V minimum, per the LM323 datasheet.) Since the LM323 is rated for 3 amperes, it is unlikely that the plug-in sinks more than that from the "+7 UNREG" input.
Mechanically, the Nicolet 526 is a three-bay 5000-series plug-in. It mates with the center-bay plug-in connector. The Nicolet 526 is made of four boards and a backplane. Connection to the Tektronix mainframe is done via thee backplane. The four boards are:
- ADC and Register
- Address
- Control
- Memory
The design makes heavy use of 7400-series digital logic in DIP packages. 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 wires connecting the backplane board on the 526 to the mainframe interface connector on the 526 are labeled:
- H LOCK TRIG (white w/ black stripe)
- TRIGGER (light violet)
- RO TRIG (violet)
- Y LOCK IN (blue)
- FID SIG (green) maybe "FID" stands for "Free Induction Decay" in NMR?
- SIGNAL (brown)
- RO STUS (yellow)
- +7 UNREG (black)
- +7 UNREG (black)
- GND (white)
- GND (white)
- -VERT SIG (white w/ red stripe)
- +VERT SIG (white w/ brown stripe)
- -HORIZ SIG (white w/ orange stripe)
- +30 (red)
- -30 (orange)
The 12-pin rear-panel connector has its pins numbered on the inside of the connector.
| Pin | Function | Comment |
|---|---|---|
| 1 | ||
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 | ||
| 8 | ||
| 9 | ||
| 10 | Ground | |
| 11 | ||
| 12 |
-
Front
-
Top
-
Left
-
Right
-
Bottom
-
ADC and Register
-
ADC and Register
-
Address Board
-
Address Board
-
Control Board
-
Control Board
-
Memory
-
Memory
-
Rear
-
Top front
-
Right front
-
Bottom front
-
Mainframe rear connector internal
-
Mainframe rear connector external
-
Mainframe rear connector to J604
