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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]] | |||