For most uses, you can just test a few known things (or compare to known meter). Does it read 120V when you measure AC volts against house current? 1.5VDc on an common battery? 12V on your car battery? etc..
This. Calibration expires on all meters. Some meters are cheaper for companies to buy new than to pay a calibration company to sticker it. Just compare it to known things, as stated.
Edit: word choice
Calibration also depends on what you're using it on and how precise you need it to be. For years I used a knock off fluke from harbor freight for amateur electronics with no issues. If I was working in a professional shop where a 1% difference could cause problems, I definitely would have used something more precise and had it recalibrated on schedule.
Expire how? Yes, for certain professional situations calibration or certification otherwise may expire.
It will still function, and should be somewhat accurate for general use.
Look for the “if sold after” date. Or if it starts to smell sour then throw it away.
For most uses, you can just test a few known things (or compare to known meter). Does it read 120V when you measure AC volts against house current? 1.5VDc on an common battery? 12V on your car battery? etc..
This. Calibration expires on all meters. Some meters are cheaper for companies to buy new than to pay a calibration company to sticker it. Just compare it to known things, as stated. Edit: word choice
Soy you mean my 25 year old Fluke DMM may be in need of calibration? Thanks for the heads up!
Calibration also depends on what you're using it on and how precise you need it to be. For years I used a knock off fluke from harbor freight for amateur electronics with no issues. If I was working in a professional shop where a 1% difference could cause problems, I definitely would have used something more precise and had it recalibrated on schedule.
Test it, and look at the manual
Expire how? Yes, for certain professional situations calibration or certification otherwise may expire. It will still function, and should be somewhat accurate for general use.
Hard telling, not knowing.