Excel ISERROR Function. The Excel ISERROR function returns TRUE for any error type that excel generates, including #N/A, #VALUE!, #REF!, #DIV/0!, #NUM!, #NAME?, or #NULL! You can use the ISERR function together with the IF function to test for an errors and display a custom message, or run a different calculation when found.
Meat is done when the temperature at its thickest point reaches the point at which it is safe to eat. That doesn't mean it's ready, though. According to USDA, ribs are done when they are 145Â°F internal temp, but they may still be tough. If you take them up to 190 to 203Â°F, the collagens and fats melt at this temp and make the meat more tender and juicy. Then they're ready!
If cooking several racks of ribs, use a rib rack and place the meat side of the ribs facing the fire. Add the smoking chips and cover the grill. On average, beef ribs will need about 3 to 5 hours of cooking time, depending on the thickness of the meat and other factors such as weather conditions.