Tektronix 7904A Oscilloscope

The Tektronix 7904A is a direct-view oscilloscope delivering 500 MHz bandwidth for precision signal analysis across four channels. Purpose-built for electronics R&D, signal integrity testing, and field troubleshooting, this instrument combines fast acquisition with flexible triggering and delayed-sweep capability. Its modular plug-in architecture adapts to specialized measurement requirements—from differential amplification to spectrum analysis—making it a configurable platform for demanding laboratory and production environments.

– Technical Specifications

Performance
• Bandwidth: 500 MHz
• Channels: 4
• Sweep speed: 500 ps/div to 5 s/div
• Vertical deflection: 5 mV/div to 2 V/div (plug-in dependent)
• Input impedance: 1 MΩ ± 2% (15 pF ± 2 pF parallel) or 50 Ω ± 2%

Display & Acquisition
• CRT: Direct-view bistable storage
• Graticule: 8 × 10 divisions, variable illumination
• Trigger modes: AUTO, NORM, SINGLE
• Trigger coupling: DC, AC, LF Reject, HF Reject, Noise Reject
• Trigger sources: CH1, CH2, CH3, CH4, EXT, EXT/10, Line
• Trigger holdoff: 0.01 µs to 2.0 s variable
• Delayed sweep: Yes, independent main/delayed trigger controls

Electrical
• Power input: 100–135 VAC / 115–127 VAC / 200–250 VAC / 230–250 VAC, 50/60 Hz
• Power consumption: ~250 VA max

Physical
• Dimensions: 7.25 in H × 17.1 in W × 15.75 in D (184 mm × 434 mm × 400 mm)
• Weight: ~40 lbs (18.1 kg)
• Rackmount: 19-inch standard available

– Key Features

• Bistable storage CRT for transient capture and waveform retention
• Six-level trigger coupling filters simplify signal isolation
• Probe compensation output: 1 kHz square wave
• External trigger BNC input accepts both 50 Ω and 1 MΩ terminations
• Channel inputs via BNC connectors

– Typical Applications

• Digital and analog circuit debugging
• Signal integrity and timing analysis
• High-frequency waveform observation
• Multi-channel signal correlation

– Compatibility & Integration

7000-series plug-in modules customize the 7904A for specialized measurements: high-gain amplifiers, differential amplifiers, logic analyzers, spectrum analyzers, and demodulators. Compatible with Tektronix P6100 series probes and standard 50 Ω / 1 MΩ passive, active, and differential probes via appropriate interface modules.