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The shield is made of a thick high-impact plastic, | The shield is made of a thick high-impact plastic, | ||
and the 571 has an internal microswitch so its firmware knows if the shield is in the up or down position. | and the 571 has an internal microswitch so its firmware knows if the shield is in the up or down position. | ||
{{BeginSpecs}} | |||
{{Spec | Collector Sweep | 0.5 V to 50 V (both polarities) with 2 A drive, 0.5 V to 100 V with 1 A drive }} | |||
{{Spec | Vertical Display | plots collector current from 5 μA per division to 200 mA per division with 2% accuracy }} | |||
{{Spec | Horizontal Display | plots collector voltage with 2% accuracy }} | |||
{{Spec | CRT | raster scan, 640x336 resolution, monochrome, magnetic deflection, CRT made by Philips }} | |||
{{Spec | Line voltage | 100 to 240 V<sub>AC</sub>, 50 or 60 Hz }} | |||
{{Spec | Power | 240 W max − Actual consumption based on transistor being tested }} | |||
{{Spec | Size | (W/L/H) 14.6" × 13.8" × 8.1" }} | |||
{{Spec | Weight | 9 kg (19.8 lb) }} | |||
{{EndSpecs}} | |||
==Internals== | ==Internals== | ||
The Tektronix 571 is a computer-based instrument. | The Tektronix 571 is a computer-based instrument. | ||
Software running in an Intel 8048 microcontroller performs the I-V curve measurements | Software running in an [[Intel 8048]] microcontroller performs the I-V curve measurements | ||
by sending commands to programmable base and collector power supplies, | by sending commands to programmable base and collector power supplies, | ||
and reading the digitized that results. | and reading the digitized that results. | ||
Software provides the user interface, reading the buttons and generating the displayed bitmap. | Software provides the user interface, reading the buttons and generating the displayed bitmap. | ||
The 571 uses an National Semiconductor NS405 Display/Terminal Management Processor IC for generating the | The 571 uses an National Semiconductor NS405 Display/Terminal Management Processor IC for generating the video waveform that is displayed. | ||
video waveform that is displayed. | |||
The video waveform is fed to a monochrome raster CRT monitor. | The video waveform is fed to a monochrome raster CRT monitor. | ||
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The collector supply is linear, basically a discrete power op-amp. | The collector supply is linear, basically a discrete power op-amp. | ||
The output stage is a Darlington configuration of three NPN transistors. | The output stage is a Darlington configuration of three NPN transistors. | ||
When supplying | When supplying 2 A to the DUT at 0.5 V, the power dissipation in the collector supply output transistors is around 100 watts. | ||
is around 100 watts. | In contrast, curve tracers that use rectified mains frequency from a transformer, e.g., the [[576]], dissipate very little internally even while supplying high current to the DUT. | ||
In contrast, curve tracers that use rectified mains frequency from a transformer, e.g., the [[576]], | |||
dissipate very little internally even while supplying high current to the DUT. | |||
===CRT=== | ===CRT=== | ||
The 571 uses a [[Media:Philips m24-306 308 310 328 datasheet.pdf|Philips M24-306GH/ED]] 9 inch monochrome (green) CRT, | The 571 uses a [[Media:Philips m24-306 308 310 328 datasheet.pdf|Philips M24-306GH/ED]] 9 inch monochrome (green) CRT, Tektronix part number 119-3795-00. | ||
Tektronix part number 119-3795-00. | It is possible that Tek bought the CRT and its associated power supply and deflection circuitry as a single OEM module. | ||
It is possible that Tek bought the CRT and its associated power supply and | |||
deflection circuitry as a single OEM module. | |||
===ROMs and Programmable Logic Devices=== | ===ROMs and Programmable Logic Devices=== | ||
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* U509 160-7045-00 | * U509 160-7045-00 | ||
These are soldered in. | These are soldered in. | ||
==Pictures== | ==Pictures== | ||