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575: Difference between revisions
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The Tektronix 575 is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]]. | The Tektronix 575 is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]]. | ||
It can be thought of as being composed of three modules: | It can be thought of as being composed of three modules: an x-y display, a step source, and a collector | ||
sweep source. | |||
== X-Y display == | |||
The vertical and horizontal amplifiers are very similar, | |||
using the two halves of a [[6CG7]] dual-triode tube as the output amplifier. | |||
The CRT has -1700V on the cathode and +2500V on the anode. | |||
The HV power supply uses two [[5642]] rectifier tubes. | |||
== Step Source == | |||
This uses a gated miller integrator to generate controlled steps. | |||
The result is a staircase waveform, which generates different traces in the the family of I-V curves of the transistor. | |||
== Collector Sweep == | |||
Power from the mains goes through an isolation transformer and a variac and is rectified by germanium diodes to produce the collector sweep voltage. The isolation transformer has two pairs of secondary taps, one for high voltage (0 to 200V) and low current, the other for low voltage (0 to 20V) and high current. The maximum power that can be delivered to the transistor in either mode is approximately 200 watts. | |||
== Type 175 High Current Adaptor == | |||
The 575 can be paired with a [[175]] for high current device measurements. | The 575 can be paired with a [[175]] for high current device measurements. | ||
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range switches have settings for external input, at 0.1 V/div sensitivity. | range switches have settings for external input, at 0.1 V/div sensitivity. | ||
== Rectifiers == | |||
Early 575 versions used [[selenium rectifiers]]. A kit for conversion to | Early 575 versions used [[selenium rectifiers]]. A kit for conversion to | ||
silicon diodes was available and is documented in the back of the manual. | silicon diodes was available and is documented in the back of the manual. | ||
The 575 has a [[thermal cutoff]]. | The 575 has a [[thermal cutoff]]. | ||