The Tektronix 7844 is a dual-beam oscilloscope mainframe that accepts up to four 7000-Series plug-in units for customized signal analysis across laboratory, research, and industrial applications. Its dual-gun CRT with full-overlap screen enables simultaneous observation and comparison of two independent signals, while separate vertical and horizontal deflection systems provide flexible measurement configuration. The instrument achieves bandwidth up to 400 MHz with compatible plug-ins, delivering 0.9 ns rise time, and can be extended to 1 GHz using direct-access 7A21N deflection-plate connections. A high-speed CRT with dome-shaped scan-expansion mesh captures fast transients, supported by pulsed graticule and CRT readout for single-shot photography. The 7844 features fastest calibrated sweep speed of 1 ns/Div, beam isolation exceeding 100:1 from DC to 150 MHz, and X-Y phase shift below 2° from DC to 50 kHz. Its modular architecture and full horizontal crossover capability—allowing either beam to sweep from either time base unit—deliver the flexibility required for complex waveform analysis and diagnostic applications.
Technical Specifications
• Bandwidth: Up to 400 MHz (0.9 ns rise time with 7A19 or 7A29 plug-ins); 300 MHz with 7A24; extendable to 1 GHz with direct 7A21N plate access
• CRT: Dual-gun, full-overlap screen; 8 × 10 cm graticule per beam; high writing speed; pulsed graticule and readout; alphanumeric CRT readout; optional P11 phosphor
• Sweep Speed: 1 ns/Div (fastest calibrated)
• Beam Isolation: >100:1 from DC to 150 MHz; >30:1 from 150 MHz to 400 MHz
• X-Y Phase Shift: <2° from DC to 50 kHz
• Horizontal Bandwidth: DC to ≥1 MHz
• Z-Axis Input: 2 Vp-p for full intensity range; 500 Ω impedance; 15 ns rise time
• Power: 115 V or 230 V operation; 50–400 Hz line frequency; regulated DC supplies
– Key Features
• Four vertical plug-in slots with independent beam selection
• Full horizontal crossover for flexible time base assignment
• Dome-shaped scan-expansion mesh enhances CRT sensitivity
• Pulsed readout simplifies transient photography
– Typical Applications
• High-speed transient capture and analysis
• Dual-signal comparison and correlation
• Complex waveform diagnostics
– Compatibility & Integration
Accepts Tektronix 7000-Series plug-ins including 7A19, 7A24, 7A29, and 7A21N vertical units, plus 7B80, 7B85, and 7B92A time bases for expanded measurement capability.
