AN/USM-488

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The AN/USM-488 is an oscilloscope made my Tektronix for the US Department of Defense. It closely resembles a 2235.

Does it differ at all?

Answer: Yes, there the minor differences in the trigger section such as an HF reject and other differences in where the A source switches would be in the original 2235. The trigger source switches are moved to the middle of the Vertical section on the militarized version. It also has added Uncal indicators. It is more similar to the A model of the 2235 than the basic model.

Key Specifications

Bandwidth	90 MHz at 2 mV/Div, 100 MHz at 5 mV/Div and above; switchable 20 MHz limit
Rise time	3.9 ns at 2 mV/Div, 3.5 ns at 5 mV/Div and above
Deflection	2 mV/Div to 5 V/Div, 1−2−5, ±2%, and variable 2.5:1
Time base	50 ns/Div to 500 ms/Div (B timebase to 50 ms/Div), 1−2−5,  ×10 magnifier for fastest deflection of 5 ns/Div
Input impedance	1 MΩ // 20 pF
Trigger sensitivity	0.3 Div or 35 mV up to 10 MHz, 1 Div or 120 mV up to 60 MHz, 1.5 Div or 200 mV up to 100 MHz
CRT	80×100 mm² display area, P31 phosphor, 14 kV acceleration voltage
Power	90−250 VAC, 48 to 440 Hz, 40 W
Size	137 mm × 327 mm × 440 mm (5.4" × 12.9" × 17.3")
Weight	5.2 kg (11.5 lb) without accessories
Features	Delayed timebase X−Y mode Z input

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