32,199
edits
551: Difference between revisions
Jump to navigation
Jump to search
no edit summary
No edit summary |
No edit summary |
||
| Line 13: | Line 13: | ||
The '''Tektronix Type 551''', [[introduced in 1958]], | The '''Tektronix Type 551''', [[introduced in 1958]], | ||
is a 27 MHz [[dual-beam scopes|dual-beam scope]] that takes | is a 27 MHz [[dual-beam scopes|dual-beam scope]] that takes | ||
two [[letter-series and 1-series plug-ins]]. | two [[letter-series and 1-series plug-ins]]. | ||
Unlike the [[555]], it has only one set of horizontal deflection plates and | Unlike the [[555]], it has only one set of horizontal deflection plates and | ||
the trigger and sweep circuitry are built in to the mainframe. | the trigger and sweep circuitry are built in to the mainframe. | ||
The vertical amplifiers of the [[545|545A]], 551, and 555 are identical. | The vertical amplifiers of the [[545|545A]], 551, and 555 are identical. | ||
The 551 uses an L-C [[delay line]] for each vertical channel. | |||
Like the 555, the 551 has two parts: | |||
the "indicator unit" containing the signal path electronics and CRT, | |||
and an external power supply unit. | |||
The filament current for the tubes in the indicator unit is produced by a transformer in the indicator unit, | |||
T750, Tektronix part number [[120-235]]. | |||
T750 has seven isolated secondaries, each supplying 6.3 VAC. | |||
The indicator unit also contains the CRT circuit, which uses [[5642]] tubes and produces the +8650 V CRT anode voltage | |||
and the -1350 V voltage for the CRT cathode. | |||
The external power supply unit produces regulated DC voltages of -150 V, +100 V, +225 V, +350 V, and +500 V. | |||
The external power supplies of the 555 and 551 are not interchangeable. | |||
However, the cable that connects the power supply to the indicator unit is the same for the 551 and the 555. | |||
It is Tektronix part number [[012-032]]. | |||
A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage from 10 kV to 12 kV. This improved trace visibility at high sweep rates. | A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage from 10 kV to 12 kV. This improved trace visibility at high sweep rates. | ||