The Tektronix 7844 is a 400 MHz dual-beam CRT oscilloscope that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins.
Versions include the 7844 bench-top lab scope and R7844 rack-mount model.
|Bandwidth||400 MHz (with 7A19, 7A29) eq. 0.9 ns rise time|
|Fastest calibrated sweep||1 ns (with 7B80, 7B85)|
|Power||90-132 V or 180-264 V, 48 to 440 Hz, max. 235 W|
|Weight||16.3 kg (36 lbs) / R7844: 15 kg (33 lbs)|
The 7844's CRT has distributed vertical deflection plates.
The power supply is a resonant switch-mode inverter with linear post-regulation, similar to the one in the 7904. Despite this, the 7844 is fairly heavy, which is mostly due to the second vertical delay line. The delay lines need extra space and are located vertically to the right of the CRT instead of below the CRT as in other 7xx4s.
Unlike other 7000 series mainframes with switch mode PSUs, the 7844 does have a fan.
The 7844 is more complex than all other 7000 mainframes because vertical and horizontal amplifiers as well as the Z axis control boards exist twice, and there is an extra switching logic board.
- Tek 7844 page at amplifier.cd and a repair report (switch-mode PSU)
- Tek 7844 @ barrytech.com
- R7844 page with frequency response measurements
- Tek R7844 page @ EB5AGV, lots of internal photos
|Mainframe only||Catalog price||$6,100||$9,125||$13,435||$19,500|
| Mainframe with 2 × 7A19,
Right interior. Top row: Calibrator board (l), readout board (c), beam 2 horizontal amplifier (r), fan.