551: Difference between revisions

Line 24:

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 (part number [[120-235]]) that has seven isolated secondaries, each supplying 6.3 V<sub>AC</sub>.

~~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.

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 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.

However, the cable that connects the power supply to the indicator unit (part number [[012-032]]) 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.

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.

to improve trace visibility at high sweep rates, at the cost of reducing deflection sensitivity to 0.85 cm/Div.

~~However~~, ~~it reduced~~ the deflection sensitivity.

~~With MOD 108A, each division on the screen is~~ 0.85 cm.

A graticule with 0.85 cm units was supplied.

@@ Line 24: / Line 24: @@
 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 (part number [[120-235]]) that has seven isolated secondaries, each supplying 6.3 V<sub>AC</sub>.
-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.
+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 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.
+However, the cable that connects the power supply to the indicator unit (part number [[012-032]]) 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.
+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.
+to improve trace visibility at high sweep rates, at the cost of reducing deflection sensitivity to 0.85 cm/Div.
-However, it reduced the deflection sensitivity.
-With MOD 108A, each division on the screen is 0.85 cm.
 A graticule with 0.85 cm units was supplied.

551: Difference between revisions

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