Patent US 3725724A
| Patent number | US 3725724A (click link for details and documents via Google Patents) |
|---|---|
| Title | Deflection factor indicating apparatus |
| Inventors | Howard Vollum |
| Company | Tektronix Inc |
| Filing date | 1971-01-11 |
| Grant date | 1973-04-03 |
Related products:
| Manufacturer | Model | Description | Introduced | Designers |
|---|---|---|---|---|
| Tektronix | 464 | Portable 100 MHz dual-trace storage scope | 1975 | |
| Tektronix | 465 | Portable 100 MHz dual-trace scope | 1972 | Leon Orchard • Luis Navarro • Bob Shand • Jim Hinze • Frank Dewater • Pete Janowitz • Dave Laib • Al Schamel • Bert tenKate • Ken Holland • Bill Mark • George Ermini • Dennis Braatz • Neal Broadbent • Bob Leith • Len McCracken • Bob Smesrud • Ilmars Smiltins • Bob Twigg |
| Tektronix | 475 | Portable 200 MHz dual-trace scope | 1972 | Leon Orchard • Luis Navarro • Bob Shand • Jim Hinze • Jim Godwin • Les Larson • Steve Tosh • Jim Woo • Ken Holland • Bill Mark • George Ermini • Dennis Braatz |
| Tektronix | 5A13N | 2 MHz Differential Comparator | 1972 | |
| Tektronix | 5A14N | Quad-channel 1 MHz amplifier | 1971 | |
| Tektronix | 5A15N | 2 MHz single channel amplifier | 1971 | |
| Tektronix | 5A18N | 2 MHz dual-channel amplifier | 1971 | |
| Tektronix | 5A20N | 1 MHz differential amplifier | 1971 | Roy Hayes |
| Tektronix | 5A21N | 1 MHz differential amplifier | 1971 | Roy Hayes |
| Tektronix | 5A22N | 1 MHz differential amplifier | 1971 | |
| Tektronix | 5A26N | Dual 1 MHz differential amplifier | 1976 | |
| Tektronix | 5A48 | 60 MHz dual-channel amplifier plugin | 1974 | |
| Tektronix | 5B10N | single timebase | 1971 | |
| Tektronix | 5B12N | dual timebase | 1971 | |
| Tektronix | 5B31 | Digitally delayed timebase | 1975 | |
| Tektronix | 5B40 | 60 MHz single timebase | 1975 | |
| Tektronix | 5B42 | 60 MHz dual timebase | 1974 | |
| Tektronix | 5B44 | 60 MHz dual time base plug-in | 1976 |
This patent by Tek founder Howard Vollum describes the deflection factor indicators used on scopes like the popular 465 and 475, where one of two lamps − selected by the probe readout pin − illuminates the applicable number on a knob skirt.
The text specifically refers to both vertical and horizontal scales:
A pair of fixed light sources mounted at two different readout positions beneath the flange are selectively energized by an external multiplier switch to illuminate only one of the factors at such readout positions in accordance with the operation of such multiplier switch. The rotary switch and multiplier switch may be connected to change the gain of a vertical amplifier or to change the sweep speed of a horizontal ramp generator in a cathode ray oscilloscope so that the illuminated character display on the knob dial automatically indicates the proper deflection factors of such oscilloscope.