The Tektronix 1485R is a component analog waveform monitor for professional video signal analysis in broadcast and production environments. This 5-inch diagonal CRT-based instrument displays waveforms, vectorscope, and picture monitoring with calibrated magnification up to ×50, enabling precise assessment of video signal characteristics including brightness, color, and timing across NTSC and PAL standards. The 1485R accepts video input levels from −30 to +20 IRE at 75 ohm impedance and provides ±0.2% amplitude measurement accuracy with digital line and field selection for vertical interval testing. Advanced measurement modes support sweep speeds from 5 µs/DIV to 10 µs/DIV, and waveform comparison via timebase foldback overlays portions of the display for detailed signal analysis. DC restoration with clamping options and automatic CRT brightening at high-magnification settings enhance measurement capability.
Technical Specifications
• Display: 5-inch diagonal CRT, 525 lines (NTSC), 4:3 aspect ratio
• Video Input: −30 to +20 IRE, 75 ohm impedance
• Frequency Response: 5 Hz to 5.5 MHz
• Amplitude Accuracy: ±0.2%
• Magnification: Up to ×50 calibrated, with automatic CRT brightening at high magnification
• Sweep Speeds: 5 µs/DIV and 10 µs/DIV
• Power: 110/220 VAC, 50/60 Hz
• Dimensions (Rackmount): 19″ width, 5.25″ height, 18″ depth
• Weight: 24.6 lbs
– Key Features
• Dual standard support: NTSC and PAL video signals
• Waveform, vectorscope, and picture monitoring in single display
• Digital line and field selection for VBI analysis (NTSC line 17, PAL lines 17 and 330)
• 15-line display capability for VTR applications
• Timebase foldback for waveform comparison
• DC restoration with back porch or sync tip clamping; fast DC restorer option
• Internal/external sync capability
• Cabinet or rackmount configuration
• Option 01: 1 megohm, 20 pF probe input
• Option 02: Carrying case (cabinet version only)
– Typical Applications
• Television broadcast signal quality assurance
• Video production signal monitoring and verification
• Professional video engineering and technician testing
• Vertical blanking interval and timing analysis
– Compatibility & Integration
The 1485R operates with 75 ohm video inputs and auxiliary video input at the rear panel. Accepts both PAL and NTSC signal standards with independent or external sync.
