As discussed earlier in the thread I don’t think either of these can measure that much power.
I did find this interesting text on a Panasonic site:
Troubleshooting - The Microwave oven keeps tripping the circuit breaker.
The microwave oven may draw as much as 16.7A current at the initial stage per our specifications. The input current will gradually drop along with the cooking time (i.e. 16.0 A after 3 min; 15A after 5 min…). Our design takes the advantage of the 15A circuit breaker’s characteristic that they can withstand up to 20A current draw within the first 10 min in order to maximize the output power in the first few minutes of cooking. This is the typical length of programmed cooking time for most customers.
The 12.7A rating listed in the operating Instruction is the average power consumption. An inverter microwave oven does not provide a constant input current like conventional microwave ovens.
The circuit breaker tripping is likely caused either by the microwave oven being on a shared circuit with other appliances (the unit should be on a 15A circuit by itself) OR the circuit breaker is older and has become more sensitive (should be replaced).
For more information on microwave power and safety requirements refer to the microwaves operating instructions.
Source:
Error - Panasonic North America.
I don’t see its power draw dropping much when I run it as they describe but so far I’ve run it max 2 minutes or so.