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The Tektronix Type 175 is an external unit that extends the current capability of the [[575]].
{{Instrument Sidebar
The 175 uses the standard circuit topology for the collector supply: a variac followed by a multitap
|manufacturer=Tektronix
isolation transformer, followed by full-wave rectifiers.
|model=175
|class=Accessory
|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:
* 0 - 20V collector voltage, 200A maximum collector current
* 0 - 20 V collector voltage, 200 A maximum collector current
* 0 - 100V collector voltage, 40A 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 165-15 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 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.


Separate transformer taps and rectifiers are used for the two modes.  In the 0-20V mode,
The 175 is 12"x13"x24" and weighs 38 kg (84 pounds).
[[45L10]] rectifiers are used.  Unlike the 575 which routes the test current through the front panel
Most of the weight of the 175 is due to the large transformer
switches, the 175 routes the 0-20V collector supply through 100A relays, whose coil current are
([[Media:Tek 120-0197-00.pdf|part number 120-197]]) for the collector supply.
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 0-100V mode, the test current flows through the front
panel switch.


==Pictures==
<gallery>
<gallery>
Image:Tek 175 front.jpg|Front
Tek 175 front.jpg|Front
Image:Tek 175 front2.jpg|Front
Tek 175 front2.jpg|Front
Image:Tek 175 left.jpg|Left
Tek 175 left.jpg|Left
Image:Tek 175 left open.jpg|Left internals
Tek 175 left open.jpg|Left internals
Image:Tek 175 right.jpg|Right
Tek 175 right.jpg|Right
Image:Tek 175 right open.jpg|Right internals
Tek 175 right open.jpg|Right internals
Image:Tek 175 back.jpg|Rear
Tek 175 back.jpg|Rear
Image:Tek 175 step amp.png|Step amp
Tek 175 step amp.png|Step amp
Image:Tek 175 switching diagram.png|Switching diagram
Tek 175 switching diagram.png|Switching diagram
Image:Tek 175 collector sweep.png|Collector sweep
Tek 175 collector sweep.png|Collector sweep
Tek 175 bottom.jpg|Bottom view
Tek 175 bus bar.jpg|Left internal
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>
==Components==
{{Parts|175}}
[[Category:Curve tracer plugins]]

Latest revision as of 03:32, 14 May 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

Components

Some Parts Used in the 175

Part Part Number(s) Class Description Used in
45L10 Discrete component stud-mounted rectifier 175
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