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[[Image:Tek 175 front2.jpg|thumb|300px|right]]
{{Instrument Sidebar
The '''Tektronix 175''', [[introduced in 1961]], is an external unit that extends the current  
|manufacturer=Tektronix
capability of the [[575|575 curve tracer]].
|model=175
The 175 uses the standard circuit topology for the collector supply: a variac followed by a multi-tap
|class=Accessory
isolation transformer, followed by full-wave rectifiers.
|series=
|summary=High-Current Curve Tracer Adapter
|image=Tek 175 front2.jpg
|caption=Tektronix 175
|introduced=1961
|discontinued=(?)
|designers=
|manuals=
* [[Media:Tek 175 operating instructions.pdf|Tektronix 175 Operating Instructions]]
* [[Media:Type 175 Calibration Procedure.pdf | Tektronix Type 175 Calibration Procedure]]
}}
The '''Tektronix 175''', [[introduced in 1961]], is an external unit that extends the current capability of the [[575|575 curve tracer]].
 
The 175 uses the standard circuit topology for the collector supply: a variac followed by a multi-tap isolation transformer, followed by full-wave rectifiers.


There are two modes:
There are two modes:
Line 9: Line 22:
* 0 - 100 V collector voltage, 40 A maximum collector current
* 0 - 100 V collector voltage, 40 A maximum collector current


Separate transformer taps and rectifiers are used for the two modes.  In the 0-20 V mode,  
Separate transformer taps and rectifiers are used for the two modes.   
[[45L10]] rectifiers are used.  Unlike the 575, which routes the test current through the front panel
In the 0-20 V mode, [[45L10]] rectifiers are used.   
switches, the 175 routes the 0-20 V collector supply through 100 A relays, whose coil current are
Unlike the 575, which routes the test current through the front panel switches, the 175 routes the 0-20 V collector supply through 100 A relays,  
switched by the front panel (i.e., the "COLLECTOR POLARITY" and "TRANSISTOR SELECTOR") controls.  
whose coil current are switched by the front panel (i.e., the "COLLECTOR POLARITY" and "TRANSISTOR SELECTOR") controls.  
Otherwise, the front panel switches would have to handle high  
Otherwise, the front panel switches would have to handle high currents and would be massive and difficult to operate.   
currents and would be massive and difficult to operate.  The front panel switches are break-before-make,
The front panel switches are break-before-make, which is important because if the relay coils were to be energized in the wrong combination, a short circuit would be formed.   
which is important because if the relay coils were to be energized in the wrong combination,  
In the 0-100 V mode, the test current flows through the front panel switch.   
a short circuit would be formed.  In the 0-100 V mode, the test current flows through the front
panel switch.   


The Tektronix 175 requires a 575 to work, which provides +300 V, +100 V, and -150 V to power  
The Tektronix 175 requires a 575 to work, which provides +300 V, +100 V, and -150 V to power the step generator circuit in the 175.  
the step generator circuit in the 175. The cable that connects the 175 to the 575 uses  
The cable that connects the 175 to the 575 uses [[Amphenol 165-15 connector|Amphenol 165-14 and 165-15 connectors]].
[[Amphenol 165-15 connector|Amphenol 165-14 and 165-15 connectors]].


The front panel of the 175 has Superior Electric [[Supercon connector]]s for the high-current measurements.
The front panel of the 175 has Superior Electric [[Supercon connector]]s for the high-current measurements.
Line 28: Line 38:


The 175 is 12"x13"x24" and weighs 38 kg (84 pounds).
The 175 is 12"x13"x24" and weighs 38 kg (84 pounds).
Most of the weight of the 175 is due to the large transformer for the collector supply.
Most of the weight of the 175 is due to the large transformer  
([[Media:Tek 120-0197-00.pdf|part number 120-197]]) for the collector supply.


==Pictures==
==Pictures==
<gallery>
<gallery>
File:Tek 175 front.jpg|Front
Tek 175 front.jpg|Front
File:Tek 175 front2.jpg|Front
Tek 175 front2.jpg|Front
File:Tek 175 left.jpg|Left
Tek 175 left.jpg|Left
File:Tek 175 left open.jpg|Left internals
Tek 175 left open.jpg|Left internals
File:Tek 175 right.jpg|Right
Tek 175 right.jpg|Right
File:Tek 175 right open.jpg|Right internals
Tek 175 right open.jpg|Right internals
File:Tek 175 back.jpg|Rear
Tek 175 back.jpg|Rear
File:Tek 175 step amp.png|Step amp
Tek 175 step amp.png|Step amp
File:Tek 175 switching diagram.png|Switching diagram
Tek 175 switching diagram.png|Switching diagram
File:Tek 175 collector sweep.png|Collector sweep
Tek 175 collector sweep.png|Collector sweep
File:Tek 175 bottom.jpg|Bottom view
Tek 175 bottom.jpg|Bottom view
File:Tek 175 bus bar.jpg|Left internal
Tek 175 bus bar.jpg|Left internal
File:Tek 575 on 175.jpg
Tek 575 on 175.jpg
Tek 148-015 1.jpg|147-015 20 ampere relay used in 175
Tek 148-015 2.jpg|147-015 20 ampere relay used in 175
Tek 148-015 3.jpg|147-015 20 ampere relay used in 175
</gallery>
</gallery>


[[Category:Curve tracers]]
[[Category:Curve tracer plugins]]
[[Category:Introduced in 1961]]

Latest revision as of 09:11, 10 March 2024

Tektronix 175
High-Current Curve Tracer Adapter
Tektronix 175

Produced from 1961 to (?)

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

The Tektronix 175, introduced in 1961, is an external unit that extends the current capability of the 575 curve tracer.

The 175 uses the standard circuit topology for the collector supply: a variac followed by a multi-tap isolation transformer, followed by full-wave rectifiers.

There are two modes:

  • 0 - 20 V collector voltage, 200 A maximum collector current
  • 0 - 100 V collector voltage, 40 A maximum collector current

Separate transformer taps and rectifiers are used for the two modes. In the 0-20 V mode, 45L10 rectifiers are used. Unlike the 575, which routes the test current through the front panel switches, the 175 routes the 0-20 V collector supply through 100 A relays, whose coil current are switched by the front panel (i.e., the "COLLECTOR POLARITY" and "TRANSISTOR SELECTOR") controls. Otherwise, the front panel switches would have to handle high currents and would be massive and difficult to operate. The front panel switches are break-before-make, which is important because if the relay coils were to be energized in the wrong combination, a short circuit would be formed. In the 0-100 V mode, the test current flows through the front panel switch.

The Tektronix 175 requires a 575 to work, which provides +300 V, +100 V, and -150 V to power the step generator circuit in the 175. The cable that connects the 175 to the 575 uses Amphenol 165-14 and 165-15 connectors.

The front panel of the 175 has Superior Electric Supercon connectors for the high-current measurements. The positive (red) plug that goes into the 175 is a model PP100GR pin plug. The negative (black) plug that goes into the 175 is a model PS100GB socket plug.

The 175 is 12"x13"x24" and weighs 38 kg (84 pounds). Most of the weight of the 175 is due to the large transformer (part number 120-197) for the collector supply.

Pictures

  • Front

    Front

  • Front

    Front

  • Left

    Left

  • Left internals

    Left internals

  • Right

    Right

  • Right internals

    Right internals

  • Rear

    Rear

  • Step amp

    Step amp

  • Switching diagram

    Switching diagram

  • Collector sweep

    Collector sweep

  • Bottom view

    Bottom view

  • Left internal

    Left internal

  • 147-015 20 ampere relay used in 175

    147-015 20 ampere relay used in 175

  • 147-015 20 ampere relay used in 175

    147-015 20 ampere relay used in 175

  • 147-015 20 ampere relay used in 175

    147-015 20 ampere relay used in 175

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