Nicolet 526: Difference between revisions

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{{Instrument Sidebar
|manufacturer=Nicolet
|model=526
|class=Digital
|series=5000-series scopes
|summary=Signal averager
|image=Nicolet_526_1.jpg
|caption=Nicolet 526
|introduced=1976
|discontinued=(?)
|designers=
|manuals=
*''please add'' [[Category:Manual needed]]
}}
The '''Nicolet 526''' is a signal averager that is used in a modified OEMed [[5110|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.
How does the Nicolet 526 get the horizontal signal to the scope if it only plugs into the right vertical plug-in interface connector?
In a standard, unmodified 5103, there is no signal path from the right vertical connector to the horizontal amplifier.
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 which has a 40 position two sided edge connector for each board.
Connection to the Tektronix mainframe is done via the backplane.
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.
* 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), pin 27B of the plug-in connector
* TRIGGER (light violet) 26A
* RO TRIG (violet) 26B
* Y LOCK IN (blue) 25B
* 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
* RO STUS (yellow) 23B
* +7 UNREG (black), pin 22A and 22B of the plug-in connector
* +7 UNREG (black), pin 22A and 22B of the plug-in connector
* GND (white) 14A and 14B (standard 5000-series pinout)
* GND (white) 14A and 14B (standard 5000-series pinout)
* -VERT SIG (white w/ red stripe) 13B (standard 5000-series pinout for vert CH2)
* +VERT SIG (white w/ brown stripe) 13A (standard 5000-series pinout for vert CH2)
* -HORIZ SIG (white w/ orange stripe) 11B
* +30 (red) 5A (standard 5000-series pinout)
* -30 (orange) 5B (standard 5000-series pinout)
* 11A is jumpered to 14B at the male plug-in connector of the 526.
The 12-pin rear-panel connector has its pins numbered on the inside of the connector.
{| class="wikitable"
|-
! Pin
! Function
! Comment
|-
|  1 ||    |        || 
|-
|  2 ||    |        || 
|-
|  3 ||    |        || 
|-
|  4 ||    |        || 
|-
|  5 ||    |        || 
|- 
|  6 ||    |        ||
|-
|  7 ||    |        || 
|-
|  8 ||    |        || 
|-
|  9 ||    |        ||
|-
| 10 ||    |  +7 UNREG || 
|-
| 11 ||    |        ||
|-
| 12 ||    |        || 
|}
<gallery>
<gallery>
nicolet_526_1.jpg
nicolet_526_1.jpg|Front
nicolet_526_2.jpg
nicolet_526_2.jpg|Top
nicolet_526_3.jpg
nicolet_526_5.jpg|Left
nicolet_526_4.jpg
nicolet_526_3.jpg|Right
nicolet_526_5.jpg
nicolet_526_4.jpg|Bottom
nicolet_526_6.jpg
nicolet_526_6.jpg|ADC and Register
nicolet_526_7.jpg
nicolet_526_7.jpg|ADC and Register
nicolet_526_8.jpg
nicolet_526_8.jpg|Address Board
nicolet_526_9.jpg
nicolet_526_9.jpg|Address Board
nicolet_526_10.jpg
nicolet_526_10.jpg|Control Board
nicolet_526_11.jpg
nicolet_526_11.jpg|Control Board
nicolet_526_12.jpg
nicolet_526_12.jpg|Memory
nicolet_526_13.jpg
nicolet_526_13.jpg|Memory
nicolet_526_14.jpg
nicolet_526_14.jpg|Rear
nicolet_526_15.jpg
nicolet_526_15.jpg|Top front
nicolet_526_16.jpg
nicolet_526_16.jpg|Right front
nicolet_526_17.jpg
nicolet_526_17.jpg|Bottom front
nicolet_526_18.jpg
nicolet_526_18.jpg|Mainframe rear connector internal
nicolet_526_19.jpg
nicolet_526_19.jpg|Mainframe rear connector external
nicolet_526_20.jpg|Mainframe rear connector to J604
</gallery>
</gallery>
[[Category:5000 series plugins]]
[[Category:Specifications needed]]
[[Category:Nicolet products]]

Latest revision as of 00:45, 12 March 2022

Nicolet 526
Signal averager
Nicolet 526

Produced from 1976 to (?)

Manuals
  • please add
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

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 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.

How does the Nicolet 526 get the horizontal signal to the scope if it only plugs into the right vertical plug-in interface connector? In a standard, unmodified 5103, there is no signal path from the right vertical connector to the horizontal amplifier.

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 which has a 40 position two sided edge connector for each board. Connection to the Tektronix mainframe is done via the backplane. 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.
  • 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), pin 27B of the plug-in connector
  • TRIGGER (light violet) 26A
  • RO TRIG (violet) 26B
  • Y LOCK IN (blue) 25B
  • 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
  • RO STUS (yellow) 23B
  • +7 UNREG (black), pin 22A and 22B of the plug-in connector
  • +7 UNREG (black), pin 22A and 22B of the plug-in connector
  • GND (white) 14A and 14B (standard 5000-series pinout)
  • GND (white) 14A and 14B (standard 5000-series pinout)
  • -VERT SIG (white w/ red stripe) 13B (standard 5000-series pinout for vert CH2)
  • +VERT SIG (white w/ brown stripe) 13A (standard 5000-series pinout for vert CH2)
  • -HORIZ SIG (white w/ orange stripe) 11B
  • +30 (red) 5A (standard 5000-series pinout)
  • -30 (orange) 5B (standard 5000-series pinout)
  • 11A is jumpered to 14B at the male plug-in connector of the 526.

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 +7 UNREG
11
12


  • Front

    Front

  • Top

    Top

  • Left

    Left

  • Right

    Right

  • Bottom

    Bottom

  • ADC and Register

    ADC and Register

  • ADC and Register

    ADC and Register

  • Address Board

    Address Board

  • Address Board

    Address Board

  • Control Board

    Control Board

  • Control Board

    Control Board

  • Memory

    Memory

  • Memory

    Memory

  • Rear

    Rear

  • Top front

    Top front

  • Right front

    Right front

  • Bottom front

    Bottom front

  • Mainframe rear connector internal

    Mainframe rear connector internal

  • Mainframe rear connector external

    Mainframe rear connector external

  • Mainframe rear connector to J604

    Mainframe rear connector to J604

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