485: Difference between revisions
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uses custom integrated circuits for most of the gain blocks. | uses custom integrated circuits for most of the gain blocks. | ||
Triggering is with [[tunnel diodes]]. | Triggering is with [[tunnel diodes]]. | ||
A distinguishing feature - at least in a portable oscilloscope of its period - is the Alternate Horizontal Mode. | |||
In this mode, the B timebase is shown in a separate full-width scan, as opposed to the more common Mixed Mode, | |||
where the B timebase is shown on the same line as the A timebase, after the delay time. At the same time, | |||
the section shown with the B timebase is shown highlighted in the A scan. | |||
The 465, which was introduced after the 485, only received this feature in its "B" incarnation (465B). | |||
* [http://bama.edebris.com/download/tek/485/tek-485.pdf Tektronix 485 Manual (PDF)] | * [http://bama.edebris.com/download/tek/485/tek-485.pdf Tektronix 485 Manual (PDF)] | ||
Revision as of 07:51, 30 June 2013
The Tektronix Type 485 is a dual-trace portable analog oscilloscope with a maximum bandwidth of 350MHz. The impedance of the inputs can be set individually to 50 ohms or 1 megohm. The scope achieves its maximum bandwidth when the inputs are in 50-ohm mode. The 485 was introduced in March of 1972. It uses a switching power supply and uses custom integrated circuits for most of the gain blocks. Triggering is with tunnel diodes.
A distinguishing feature - at least in a portable oscilloscope of its period - is the Alternate Horizontal Mode. In this mode, the B timebase is shown in a separate full-width scan, as opposed to the more common Mixed Mode, where the B timebase is shown on the same line as the A timebase, after the delay time. At the same time, the section shown with the B timebase is shown highlighted in the A scan. The 465, which was introduced after the 485, only received this feature in its "B" incarnation (465B).
