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the two beams to be cancelled out in step 8 of the calibration procedure. | the two beams to be cancelled out in step 8 of the calibration procedure. | ||
The 502 has a 123 °F (50.5 °C) [[thermal cutoff]] switch. | |||
==Links== | ==Links== | ||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/502A.htm Tektronix 502A] @ amplifier.cd (many internal pictures) | * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/502A.htm Tektronix 502A] @ amplifier.cd (many internal pictures) |