Harbor Freight Freebie DMM
Just an FYI: I got a coupon in the mail from HF for a free DMM with any purchase. I can always use another meter and I'm in need of a larger vise grip so I stopped by HF and cashed in my coupon. I...
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TIPS
Purchase a new 9-volt lithium non-rechargeable battery. One that has the longest to expire date. Secondly, get a precision resistor a 1% if possible. One Megohm would be a good value. Whatever it takes measure the resistance across the resistor with a known high-quality ohm meter. Write it down.
You are not looking for accuracy in values. But repeatability when verifying an unknown measuring device. I have seen cheap resistors wander in resistance even when stored in drawer. Weird, but a quality resistor is not pricey, so who cares??
The lithium battery will retain stable voltage for quite a number of years.
Purchase a new 9-volt lithium non-rechargeable battery. One that has the longest to expire date. Secondly, get a precision resistor a 1% if possible. One Megohm would be a good value. Whatever it takes measure the resistance across the resistor with a known high-quality ohm meter. Write it down.
You are not looking for accuracy in values. But repeatability when verifying an unknown measuring device. I have seen cheap resistors wander in resistance even when stored in drawer. Weird, but a quality resistor is not pricey, so who cares??
The lithium battery will retain stable voltage for quite a number of years.
