422

The Tektronix 422 is a portable dual-trace oscilloscope. The Tektronix 422 was introduced in 1965. The Tektronix 422 was produced from 1965 to 1975. The Tektronix 422 has 15 MHz bandwidth. A rack-mount version was offered as the R422.^[1][2][3][4]

The Tektronix 422 has a sweep range from 500 ns/div to 0.5 s/div. The Tektronix 422 has a 150 ns delay line. The Tektronix 422 input is 1 MΩ in parallel with 30 pF, with maximum 300 V DC plus peak AC. The Tektronix 422 uses a T4220 CRT with P31 phosphor and 6 kV acceleration. The Tektronix 422 uses a trigger amplifier that drives a 1N3719 tunnel diode acting as a Schmitt trigger, and a sweep starts when the trigger circuit switches a second tunnel diode. The Tektronix 422 uses the T4220 CRT with a scan expansion mesh. Early Tektronix 422 units used an 8056 Nuvistor in the front end, and later versions used a FET in its place.^[1][3][2]

The Tektronix 422 was offered with detachable power-supply arrangements. The Tektronix 422 had an AC-only power-supply version and an AC/DC power-supply version. The AC/DC version could charge an optional internal battery pack and could operate without mains power. The AC model could be powered from 115 V or 230 V AC at 45 Hz to 440 Hz. The AC/DC model could also be powered from 11.5 V to 35 VDC.^[1][2][3]

Oscilloscopes are support instruments rather than process tools. Oscilloscopes are used around development benches, maintenance activities, calibration work, and diagnostics for electronic subsystems that control or monitor manufacturing and laboratory equipment. Oscilloscopes generally sit outside the direct material-processing path and help engineers evaluate signals from sensors, power supplies, timing circuits, and communications links.

Portable oscilloscopes are used for field service, bench troubleshooting, adjustment, and waveform verification in electronic equipment. Oscilloscopes are used to examine analog pulses, repetitive signals, timing relationships, and intermittent faults. Dual-trace instruments are especially useful when one signal must be compared against another reference or control signal.