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512: Difference between revisions
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==Internals== | ==Internals== | ||
===Vertical Amplifier === | |||
The vertical signal path, fully differential and DC coupled from the front panel | The vertical signal path, fully differential and DC coupled from the front panel | ||
A and B inputs to the vertical deflection plates, is as follows: | A and B inputs to the vertical deflection plates, is as follows: | ||
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Built-in true differential inputs are also seen in later scopes such as the [[502]], [[503]], and [[504]]. | Built-in true differential inputs are also seen in later scopes such as the [[502]], [[503]], and [[504]]. | ||
===Sweep/Horizontal Amplifier === | |||
Tek 512 uses a Phantastron oscillator with miller integration for sweep generation. | |||
The final DC output level of the horizontal amplifier is dropped using a neon divider before driving the deflection plates. | |||
This is done to achieve better beam focus by approximately matching deflection plate DC level to that of 2nd anode of the CRT. | |||
===CRT=== | |||
Up to serial number 2525, the 512 used the [[5CPA]] CRT. After that, the [[5ABP]] CRT was used. | Up to serial number 2525, the 512 used the [[5CPA]] CRT. After that, the [[5ABP]] CRT was used. | ||
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Options were also available for different ranges of sweep rates. | Options were also available for different ranges of sweep rates. | ||
===Timing Capacitors === | |||
The Tek 512 manual says, | The Tek 512 manual says, | ||
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minimum temperature and aging variations. | minimum temperature and aging variations. | ||
</blockquote> | </blockquote> | ||
===HV Power Supply === | |||
Tektronix 512 oscilloscopes with serial numbers 101 through 2146 | Tektronix 512 oscilloscopes with serial numbers 101 through 2146 | ||
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is shifted up and down by 50 V relative to the constant cathode voltage, | is shifted up and down by 50 V relative to the constant cathode voltage, | ||
thereby controlling CRT beam current. | thereby controlling CRT beam current. | ||
===Trace Blanking === | |||
The blanking circuit in the 512 is somewhat unusual. Since the | The blanking circuit in the 512 is somewhat unusual. Since the | ||
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which controls the grid voltage on the CRT. | which controls the grid voltage on the CRT. | ||
===Power Supply === | |||
The power supply is stacked design with a [[5651]] voltage reference tube as the reference, | The power supply is stacked design with a [[5651]] voltage reference tube as the reference, | ||
[[6AU6]] as error amplifier, and [[12AU7]] and [[6AS7]] as series pass tubes. | [[6AU6]] as error amplifier, and [[12AU7]] and [[6AS7]] as series pass tubes. | ||