Nicolet 526

The Nicolet 526 is a signal averager that is used in a modified OEMed Tektronix 5110 (5103N/D10) mainframe. The modifications performed by Nicolet include fan cooling via the bottom panel of the scope, and a 12-pin connector on the rear panel of the scope, connected to the interface board, connector J604.

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