The Tektronix TDS 684A is a four-channel digital real-time oscilloscope designed for high-speed circuit analysis and signal capture. It delivers 1 GHz analog bandwidth with simultaneous 5 GS/s sampling across all channels, enabling precise acquisition of transients, glitches, and metastable events. The instrument combines an 8-bit vertical resolution (>11-bits with averaging), flexible triggering options, and automated measurement capabilities to accelerate debug and validation workflows.

Technical Specifications

Acquisition System
• Sampling rate: 5 GS/s per channel (simultaneous across four channels)
• Analog bandwidth: 1 GHz @ ≥10 mV/div; 750 MHz @ 5 mV/div; 600 MHz @ 2 mV/div; 500 MHz @ 1 mV/div
• Vertical resolution: 8-bits standard; >11-bits with averaging
• Record length: Up to 15,000 points per channel (500, 1000, 2500, 5000, and 15,000 sample options)
• Acquisition modes: Sample, envelope, average, high-resolution, peak-detect
• Time measurement accuracy: <110 ps @ 2 GS/s; <50 ps @ 5 GS/s

Vertical System
• Sensitivity range: 1 mV/div to 10 V/div
• Vertical accuracy: 1.5%
• Input impedance: 1 MΩ || 10 pF or 50 Ω (AC/DC coupling)
• AC coupling low-frequency limits: <10 Hz (1 MΩ); 100:1 @ 100 MHz; >30:1 @ full bandwidth (equal V/div settings)

Horizontal System
• Real-time bandwidth: 1 GHz
• Timebase range: 0.2 ns/div to 10 s/div

– Key Features

• Edge, logic, and pulse triggering with pattern and state modes
• Pulse width, runt, timeout, and setup/hold trigger types
• Video triggering option (NTSC, SECAM, PAL, HDTV, FlexFormat)
• Fully automated measurement system with waveform pass/fail template testing
• Standard waveform DSP/math processing with optional advanced analysis
• 7-inch color VGA display

– Interfaces & Storage

• GPIB (IEEE 488.2), RS-232, Centronics, and VGA I/O
• 3.5-inch DOS floppy drive with NVRAM for waveform, hardcopy, and setup storage
• Hardcopy output via GPIB, RS-232, or Centronics