175: Difference between revisions
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The Tektronix 175, [[introduced in 1961]], is an external unit that extends the current capability of the [[575]]. | [[Image:Tek 175 front2.jpg|thumb|300px|right]] | ||
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 multitap | The 175 uses the standard circuit topology for the collector supply: a variac followed by a multitap | ||
isolation transformer, followed by full-wave rectifiers. | isolation transformer, followed by full-wave rectifiers. | ||
There are two modes: | There are two modes: | ||
* 0 - | * 0 - 20 V collector voltage, 200 A maximum collector current | ||
* 0 - | * 0 - 100 V collector voltage, 40 A maximum collector current | ||
Separate transformer taps and rectifiers are used for the two modes. In the 0- | 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 | [[45L10]] rectifiers are used. Unlike the 575, which routes the test current through the front panel | ||
switches, the 175 routes the 0- | 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. | 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. The front panel switches are break-before-make, | 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, | 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- | a short circuit would be formed. In the 0-100 V mode, the test current flows through the front | ||
panel switch. | panel switch. | ||
The Tektronix 175 requires a 575. The 575 provides + | The Tektronix 175 requires a 575. The 575 provides +300 V, +100 V, and -150 V to the 175, | ||
which power the step generator circuit in the 175. | which power the step generator circuit in the 175. | ||
The cable that connects the 175 to the 575 uses [[Connectors#Amphenol_165-15|Amphenol 165-14 and 165-15 connectors]]. | The cable that connects the 175 to the 575 uses [[Connectors#Amphenol_165-15|Amphenol 165-14 and 165-15 connectors]]. | ||
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The negative (black) plug that goes into the 175 is a model PS100GB socket plug. | The negative (black) plug that goes into the 175 is a model PS100GB socket plug. | ||
The 175 is 12"x13"x24" and weighs 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 it has for the collector supply. | Most of the weight of the 175 is due to the large transformer it has for the collector supply. | ||
==Pictures== | |||
<gallery> | <gallery> | ||
Image:Tek 175 front.jpg|Front | Image:Tek 175 front.jpg|Front | ||
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File:Tek 575 on 175.jpg | File:Tek 575 on 175.jpg | ||
</gallery> | </gallery> | ||
[[Category:Curve tracers]] | |||
[[Category:Introduced in 1961]] | |||
Revision as of 23:26, 25 August 2014
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 multitap 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. The 575 provides +300 V, +100 V, and -150 V to the 175, which 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 it has for the collector supply.
Pictures
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Front
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Front
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Left
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Left internals
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Right
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Right internals
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Rear
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Step amp
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Switching diagram
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Collector sweep
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Bottom view
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Left internal
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