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{{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 | ||
|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 (PDF, needs OCR)]] | |||
}} | |||
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 | 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. | isolation transformer, followed by full-wave rectifiers. | ||
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* 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, 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 currents and would be massive and difficult to operate. | ||
Otherwise, the front panel switches would have to handle high | 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. | ||
currents and would be massive and difficult to operate. The front panel switches are break-before-make, | In the 0-100 V mode, the test current flows through the front panel switch. | ||
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 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. | ||
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Most of the weight of the 175 is due to the large transformer | 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. | ([[Media:Tek 120-0197-00.pdf|part number 120-197]]) for the collector supply. | ||
==Pictures== | ==Pictures== | ||
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[[Category:Curve tracers]] | [[Category:Curve tracers]] | ||