SC504
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, 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 |
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 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.
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 VAC 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
Custom ICs used in the SC504
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| 155-0109-00 | M120B | 155-0109-00 • 155-0109-01 | trigger | Gary Vance | 5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504 |
| 155-0122-00 | M132A | 155-0122-00 | sweep control | Larry Gagliani | 455 • SC504 |
| 155-0124-00 | M138 | 155-0124-00 | horizontal preamplifier | Bob Nordstrom | 455 • SC504 • 2230 • 2232 • 2336 • 2337 |
| 155-0161-00 | H616 | 155-0161-00 | attenuator and amplifier | SC504 |