Tektronix

485 Oscilloscope

Research Quality: 30% complete

The Tektronix 485 is a portable, dual-channel wide-band oscilloscope. The 485 provides DC to 350 MHz bandwidth with 50 Ω input impedance and DC to 250 MHz bandwidth with 1 MΩ input impedance. The 485 has a calibrated sweep rate from 1 ns/div to 0.5 s/div.^[1]

485 Oscilloscope — Inventory photo — Fig. 01485 OscilloscopeInventory photo^[2]

What is it?

The Tektronix 485 is a portable, dual-channel wide-band oscilloscope with selectable input impedance, providing up to 350 MHz bandwidth in 50 Ω mode and 250 MHz in 1 MΩ mode.

What do the numbers mean?

Power & electrical10

Frequency: 48–440 Hz (50–400 Hz Maximum)^[2]
Watts Max: 80^[2]
Amps Max: 0.9 A 115 V^[2]
Bandwidth (50 Ω): DC to at least 350 MHz^[1]
Bandwidth (1 MΩ): DC to at least 250 MHz^[1]
Deflection factor: 5 mV/div to 5 V/div in 10 calibrated steps, variable to 12.5 V/div uncalibrated^[1]
Calibrator frequency: Selectable 1 kHz and 1 MHz^[1]
Calibrator amplitude: 5 V into 1 MΩ load, 0.5 V into 50 Ω load^[1]
Line voltage range: 115 V (90–136 V) or 230 V (180–272 V); 48–440 Hz^[1]
Power consumption: 60 W maximum at 115 V, 60 Hz; 0.9 A max^[1]

Control & software1

CRT display area: 8 horizontal x 10 vertical divisions (0.8 cm/div)^[1]

Dimensions & facilities3

Dimensions (H x W x D): 6 9/16 in x 12 in (with handle) x 18 1/2 in (with panel cover)^[1]
Net weight (without accessories): 21 lb^[1]
Net weight (with panel cover and accessories): 24 lb^[1]

Configuration & options9

Line Fuse: 3 A Fast^[2]
Risetime (50 Ω): 1 ns^[1]
Risetime (1 MΩ): 1.4 ns^[1]
Sweep rate range: 1 ns/div to 0.5 s/div in 27 calibrated steps^[1]
Input impedance (50 Ω): 50 Ω within 0.5%^[1]
Input impedance (1 MΩ): 1 MΩ within 1% paralleled by approximately 20 pF^[1]
Accelerating potential: 21 kV^[1]
Operating temperature: −15°C to +55°C^[1]
Storage temperature: −55°C to +75°C^[1]

Vintage & configurations

Documented models & variants

Designation	Generation	Vintage	Changes	Source
485-1	—	—	No external trigger view	archive.org^[1]
485-2	—	—	No external trigger view; only 50 Ω vertical input impedance	archive.org^[1]
R485	—	—	Rackmount version of the 485 oscilloscope	archive.org^[1]

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Frequency48–440 Hz (50–400 Hz Maximum)^[2]
Watts Max80^[2]
Amps Max0.9 A 115 V^[2]
Bandwidth (50 Ω)DC to at least 350 MHz^[1]
Bandwidth (1 MΩ)DC to at least 250 MHz^[1]
Deflection factor5 mV/div to 5 V/div in 10 calibrated steps, variable to 12.5 V/div uncalibrated^[1]
Calibrator frequencySelectable 1 kHz and 1 MHz^[1]
Calibrator amplitude5 V into 1 MΩ load, 0.5 V into 50 Ω load^[1]
Line voltage range115 V (90–136 V) or 230 V (180–272 V); 48–440 Hz^[1]
Power consumption60 W maximum at 115 V, 60 Hz; 0.9 A max^[1]

Where are the manuals?

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Not publicly documented

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Not publicly documented

The following facts about the 485 Oscilloscope are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.

No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the 485 Oscilloscope are on record.
Answerable by: OEM historical records or a trade-press announcement
The control-system platform and OS era of the 485 Oscilloscope are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the 485 Oscilloscope are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the 485 Oscilloscope is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No publicly documented compatible parts, consumables, or accessories for the 485 Oscilloscope are on record.
Answerable by: an OEM parts catalog or a service engineer