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feynmanism
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In quantum mechanics lab our frequency meter shows ~50 Hz when it is plugged into a device which is not turned on. Is this a problem or an effect that I don't know? 
A frequency meter is a scientific instrument used to measure the frequency of an electrical signal. It works by counting the number of cycles of a signal within a specific time period and then calculating the frequency based on this count.
Some common problems with frequency meters include inaccurate readings, incorrect calibration, and interference from other electrical signals. Additionally, the age and quality of the frequency meter can also impact its performance.
If you are experiencing problems with your frequency meter, you can try recalibrating it or checking for any loose connections or damaged components. It is also important to ensure that the meter is not being affected by any external interference.
No, frequency meters are typically designed to measure specific types of signals, such as AC or DC signals. It is important to check the specifications of your frequency meter to ensure it is suitable for the type of signal you are trying to measure.
The frequency meter should be calibrated regularly, ideally every 6 months to a year, to ensure accurate readings. However, the calibration frequency may vary depending on the manufacturer's recommendations and the frequency meter's usage and environment.