SC504

Tektronix SC504
80 MHz dual-channel oscilloscope Tektronix SC504 Produced from 1978 to 1993 Manuals Tektronix SC504 Manual US Army Calbration Guide for SC501, SC502, and SC504 TM-9-6695-246-34P Parts List ServiceTekNotes #39 (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix SC504 is an 80 MHz dual-channel oscilloscope plug-in for the TM500 system.

Key Specifications

Bandwidth	80 MHz (derated to 70 MHz from 35 °C to 50 °C ambient), 10 Hz AC coupling cutoff
Rise time	4.4 ns (derated to 5.0 ns from 35 °C to 50 °C ambient)
Deflection	5 mV/Div to 10 V/Div, 1−2−5, and ×2.5 variable; max. input 250 V (DC coupled), 400 V (AC)
Sweep	50 ns/Div to 200 ms/Div, 1−2−5; variable ×2.5 (to at least 0.5 s/Div); ×10 magnifier
Trigger	0.4 div or 60 mV, DC to 30 MHz; 1.5 div or 150 mV, 30 MHz to 80 MHz; AC coupling >50 Hz; AC LF REJ >10 kHz; HF REJ <50 kHz
Input impedance	1 MΩ // 20 pF
Ext Trig Input	1 MΩ // 24 pF (750 kΩ // 28 pF when not selected), max. 250 V DC+peak AC)
CRT	8×10 divisions of 6.35 mm (0.25") each; 12 kV acceleration (+10/–2), P31 phosphor; tubes 154-0730-05, 154-0859-00, later models (~1984+) 154-0859-01 with circuit changes
Calibrator	0.6 V_p-p @ 1 kHz
Power	approx. 26 W operating, <1 W in standby
Features	1-or 2-channel (chop/alt), Add (1+2), Subtract (1-2), X-Y mode (2 MHz, <3° to 50 kHz), single sweep

Links

Rear interface

The SC504 has dedicated rear interface signal inputs switchable from the front panel AC/DC/GND/Int DC coupling selectors. These are terminated in 50 Ω (max. 5 V_RMS, 0.5 W).

Additionally, it provides a trigger input, Z-axis input (±5 V), delayed gate input (ECL), gate select input (ground for ext gate), intensify input (ECL), Ch1 trigger output (>50 mV/Div, 30 MHz), triggered gate output (ECL), holdoff output (ECL), ramp output (0−10 V), sweep reset input, ready light output, and +5 V.

click to enlarge

Internals

A slide switch under the right side cover allows the variable sweep control to be used as a variable holdoff control instead.

The SC504 uses some custom Tek ICs, namely the 155-0124-00 preamplifier (U4345), 155-0109-01 trigger (U3238), and 155-0122-00 A-B logic (U3158). There are two passive input attenuator hybrids (HY1520, HY1420) and two 155-0161-00 attenuator/amplifier hybrids (HY1530, HY1430).

The power supply uses the pass transistors provided by the two mainframe slots that the SC504 covers. Those on the right slot provide ±20 V from the mainframe's ±33.5 V rails, those on the left slot make +5 V from the +11.5 V rail and −5 V from the rectified 17 V_AC supply. Power is drawn from the right mainframe slot, the pass transistors are the only connections on the left slot.

Pictures

front panel
in operation (2ch)
in operation
top
right
right interior
left
left interior
bottom
bottom interior
rear
in operation
SC504 with non-Tek plug-ins
SC504 with FG501
SC504 with AM503 in TM503

Components

Some Parts Used in the SC504

Part	Part Number(s)	Class	Description	Used in
154-0730-05	154-0730-05	CRT	3" CRT with P31 phosphor and black graticule	SC502 • SC504
154-0859-00	154-0859-00 • 154-0859-00	CRT	3" CRT with P31 phosphor and black graticule	SC502 • SC504
155-0109-00	155-0109-00 • 155-0109-01	Monolithic integrated circuit	trigger	5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504
155-0122-00	155-0122-00	Monolithic integrated circuit	sweep control	455 • SC504
155-0124-00	155-0124-00	Monolithic integrated circuit	horizontal preamplifier	455 • SC504 • 2221 • 2230 • 2232 • 2336 • 2337
155-0161-00	155-0161-00	Hybrid integrated circuit	attenuator and amplifier	SC504