Thermal cutoff: Difference between revisions

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Thermal cutoff switches are common in all Tektronix oscilloscopes  
[[File:Thermal cutout switch.jpg|thumb|450px|right|Thermal cutout switch in an [[RM502A]] scope]]
starting in the mid-1950's.  If the chassis gets above a certain
'''Thermal cutoff switches''' are common in all Tektronix oscilloscopes  
temperature, typically about 133 Fahrenheit (56 Celsius), the switch
starting in the mid-1950s.  If the chassis gets above a certain
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.
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Certainly all of the 500-series scopes that take  
Certainly all of the 500-series scopes that take  
[[letter-series and 1-series plug-ins]] have thermal cutoff switches.
[[letter-series and 1-series plug-ins]] have thermal cutoff switches.
This also includes the [[127]], [[132]], and [[133]] powered plug-in
This also includes the [[127]], [[132]], and [[133]] powered plug-in enclosures.
enclosures.
 
The [[310|310A]] has an unusually high 165°F (74°C) thermal cutoff. 
This is due to the fact that the 310A is a compact tube scope without a fan.
 


The [[310|310A]] has an unusually high 165 Fahrenheit thermal cutoff. 
[[Category:Electromechanical components]]
This is due to the fact that the 310A is a compact tube scope without
a fan.

Revision as of 06:09, 13 November 2019

Thermal cutout switch in an RM502A scope

Thermal cutoff switches are common in all Tektronix oscilloscopes starting in the mid-1950s. If the chassis gets above a certain temperature, typically about 53 − 56 °C (128 − 133°F), the switch opens. Typically this interrupts the mains power coming into the scope and the scope will cool down.

Thermal cutoff switches used in Tek scopes are self-resetting. After the scope cools down sufficiently, the thermal switch will close, allowing power into the instrument.

Instruments without thermal cutoff switches are the exception. They are the 511, 512, 513, the 514, and possibly others.

Certainly all of the 500-series scopes that take letter-series and 1-series plug-ins have thermal cutoff switches. This also includes the 127, 132, and 133 powered plug-in enclosures.

The 310A has an unusually high 165°F (74°C) thermal cutoff. This is due to the fact that the 310A is a compact tube scope without a fan.