The Tektronix SC504 is a 80 MHz dual-channel oscilloscope plug-in for the TM500 system.
|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, P31 phoshor; 154-0730-05 tube|
|Calibrator||0.6 Vp-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|
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 VRMS, 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.
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 VAC supply. Power is drawn from the right mainframe slot, the pass transistors are the only connections on the left slot.
SC504 with FG501