SC504

Tektronix SC504
80 MHz dual-channel oscilloscope Tektronix SC504 Produced from 1978 to 1993 Manuals Tektronix SC504 Manual (PDF) TM-9-6695-246-34P Parts List (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix SC504 is a 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; mx 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, P31 phoshor; 154-0730-05 tube
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 mode, Ch2 invert switch, 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), and ramp output (0−10 V).

Internals

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 two mainframe slots. On the left mainframe slot covered by the SC504, the pass transistors are the only connections.