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The Tektronix | [[Image:Tek 175 front2.jpg|thumb|300px|right]] | ||
The 175 uses the standard circuit topology for the collector supply: a variac followed by a | 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. | 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 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. | |||
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 | |||
([[Media:Tek 120-0197-00.pdf|part number 120-197]]) for the collector supply. | |||
==Manual== | |||
* [[Media:Tek 175 operating instructions.pdf|Tektronix 175 Operating Instructions (PDF, needs OCR)]] | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek 175 front.jpg|Front | |||
Tek 175 front2.jpg|Front | |||
Tek 175 left.jpg|Left | |||
Tek 175 left open.jpg|Left internals | |||
Tek 175 right.jpg|Right | |||
Tek 175 right open.jpg|Right internals | |||
Tek 175 back.jpg|Rear | |||
Tek 175 step amp.png|Step amp | |||
Tek 175 switching diagram.png|Switching diagram | |||
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> | ||
[[Category:Curve tracers]] | |||
[[Category:Introduced in 1961]] |