The Tektronix 465M is a portable dual-channel analog oscilloscope engineered for general-purpose electronic testing and troubleshooting. Delivering 100 MHz bandwidth with a bright 8 × 10 cm CRT display, the 465M provides calibrated vertical and horizontal controls, variable triggering modes, and a delay line for capturing leading edge transients. Built with soldered-in semiconductors for enhanced reliability, this commercial variant of the military-standard AN/USM-425 has been in service since 1977.
Technical Specifications
Bandwidth & Sensitivity
• Bandwidth: DC to 100 MHz (−3 dB)
• Rise time: 3.5 ns or less
• Vertical deflection: 5 mV/div to 5 V/div (1-2-5 sequence, ±3% accuracy); continuously variable control extends to 12.5 V/div minimum
• Cascaded sensitivity: approximately 1 mV/div
• Input impedance: 1 MΩ ±2% paralleled by ~20 pF
• CMRR: ≥20 dB at 20 MHz
Vertical System
• Maximum input voltage (DC-coupled): 250 V DC + peak AC or 500 V p-p AC (≤1 kHz)
• Maximum input voltage (AC-coupled): 500 V DC + peak AC or 500 V p-p AC (≤1 kHz)
• AC-coupled lower −3 dB point: ≤10 Hz (≤1 Hz with 10X probe)
• Bandwidth limiting: ~20 MHz
Horizontal System
• Time Base A: 0.05 µs/div to 0.5 s/div (1-2-5 sequence); X10 magnifier reaches 5 ns/div
• Time Base B: 0.05 µs/div to 50 ms/div (1-2-5 sequence); X10 magnifier reaches 5 ns/div
• Sweep accuracy: ±3% (unmagnified)
• Delay time range: 200 ns to 0.5 s (minimum 200 ns); ±3% setting accuracy
• Jitter: 0.002% of 10X Time Base A setting; 0.005% at 50 Hz line operation
Triggering & Display
• Trigger modes: automatic, normal, single sweep
• Trigger holdoff: variable control; increases A sweep holdoff by minimum 10×
• CRT: P31 phosphor standard (P11 optional); 18 kV accelerating potential
• Preset intensity control
Power
• Line voltage selector: 110 V, 115 V, 120 V ranges
• Power consumption: ~75 W
– Key Features
• Dual-channel configuration for simultaneous waveform capture
• Delay line enables viewing of leading edge phenomena without pre-triggering
• Variable trigger holdoff stabilizes captures on aperiodic or complex digital signals
• Quick-change voltage selector accommodates regional utility standards
– Typical Applications
• General-purpose analog circuit troubleshooting and characterization
• Digital signal timing analysis and validation
• Transient capture and edge-rate measurement
• AC and DC signal measurement across industrial and laboratory environments
– Compatibility & Integration
The 465M maintains front panel layout compatibility with the Tektronix 465 model. Standard 1 MΩ input impedance accepts conventional analog probes. Dual independent vertical channels enable differential measurements when configured with appropriate probing techniques.
