575: Difference between revisions

Revision as of 15:46, 7 March 2017

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Transistor Curve Tracer Tektronix 575 Produced from 1957 to (?) Manuals Tektronix 575 and 175 Manual (PDF) Tektronix 575 with Mod 122C Manual (PDF) Mod 122C Kit Manual (PDF) Tektronix 575 Factory Calibration Procedure (PDF) 013-0069-00 3-Terminal Adapter (PDF) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 575 is a curve tracer for transistors, introduced in March 1957. It can be thought of as being composed of three modules: an X-Y display, a step source, and a collector sweep source.

Key Specifications

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Internals

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 -1700 V on the cathode and +2500 V on the anode. The HV power supply uses two 5642 rectifier tubes.

It is possible to use the 575 as an X-Y monitor. The vertical and horizontal range switches have settings for external input, at 0.1 V/div sensitivity.

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 200 V) and low current, the other for low voltage (0 to 20 V) and high current. The maximum power that can be delivered to the transistor in either mode is approximately 200 Watts.

575 with Mod 122C has extended collector sweep voltage to 400 V.

Rectifiers

Early 575 versions used selenium rectifiers. A kit for conversion to silicon diodes was available and is documented in the back of the manual.

The 575 has a thermal cutoff.

Type 175 High Current Adaptor

The 575 can be paired with a 175 for high current device measurements.

Links

Pictures

575 w/o Mod 122C
575 w Mod 122C
575 testing a tunnel diode
Bottom
Bottom Rear
High-Voltage Power Supply

Schematics

Unmodified Collector Supply
Collector Supply Rectifier with MOD122C
Main Power Supply
Step Generator
Amplifiers
CRT Circuit

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 Tek 575 internal.jpg
 Tek 575 rear.jpg
-Tek 575 bottom.jpg|Bottom
+Tek 575 bottom.jpg  | Bottom
-Tek 575 bottom rear.jpg|Bottom Rear
+Tek 575 bottom rear.jpg  | Bottom Rear
-Tek 575 hvps 1.jpg|High-Voltage Power Supply
+Tek 575 hvps 1.jpg  | High-Voltage Power Supply
+USA Tektronix 575 Front RAW.jpg
+USA Tektronix 575 InsideR0.jpg
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 ===Schematics===