The Telequipment S51 is a low-cost single-channel 3 MHz scope originally intended for the service and education markets.
There was an S51E model variant for education that eliminated the external trigger input in favour of a sweep (sawtooth) output, and an S51T variant with an additional (selectable) horizontal preamplifier (100 mV/cm at 10 kHz bandwidth).
The S51 is convection cooled.
|Bandwidth||DC to 3 MHz (−3 dB), AC cutoff|
|Deflection||100 mV/cm to 50 V/cm, 1−2−5|
|Input impedance||1 MΩ // 30 pF (banana connector)|
|Sweep||100 ms/cm to 1 μs/cm, 1−10 and 10:1 variable (slowest 1 s/cm)|
|CRT||5" Brimar Se5F, P1 phosphor initially / P31 on later models; 3 kV acceleration|
|X input||1-2 V/cm, 5 Hz − 200 kHz; 500 kΩ // 100 pF; (S51T: Optional 100 mV/cm, 10 kHz mode)|
|Features||Auto trigger, TV trigger, Z input|