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The Tektronix Type 175 is an external unit that extends the current capability of the [[575]]. | The Tektronix Type 175 is an external unit that extends the current capability of the [[575]]. | ||
There are two modes: | |||
* 0 - 20V collector voltage, 200A maximum collector current | |||
* 0 - 100V collector voltage, 40A maximum collector current | |||
Separate transformer taps and rectifiers are used for the two modes. In the 0-20V mode, | |||
[[45L10]] rectifiers are used. Unlike the 575 which routes the test current through the front panel | |||
switches, the 175 routes the 0-20V collector supply through 100A 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 0-100V mode, the test current flows through the front | |||
panel switch. | |||
<gallery> | <gallery> | ||