Thermal cutoff: Difference between revisions

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'''Thermal cutoff switches''' are common in all Tektronix oscilloscopes  
'''Thermal cutoff switches''' are common in all Tektronix oscilloscopes  
starting in the mid-1950s.  If the chassis gets above a certain
starting in the mid-1950s.  If the chassis gets above a certain
temperature, typically about 128-133° Fahrenheit (53-56°C), the switch
temperature, typically about 53 − 56 °C (128 − 133°F), the switch
opens.  Typically this interrupts the mains power coming into the  
opens.  Typically this interrupts the mains power coming into the  
scope and the scope will cool down.  Thermal cutoff switches used in
scope and the scope will cool down.   
 
Thermal cutoff switches used in
Tek scopes are self-resetting.  After the scope cools down sufficiently,
Tek scopes are self-resetting.  After the scope cools down sufficiently,
the thermal switch will close, allowing power into the instrument.
the thermal switch will close, allowing power into the instrument.