Any power meter has an error of about 5%, and for example, my Diamond SX600, the power values obtained when measuring signals at different frequencies under the same power are significantly different. Signals below 5 watts tend to indicate higher values, while signals above 5 watts tend to indicate lower values. Furthermore, the difference between low and high frequencies at the same power is also different. For example, when measuring a 20-watt signal at 3 MHz and 7 MHz, the results are 17-18 watts, while when using the same power on 14 MHz and 21 MHz, the result is 19 watts. Therefore, if possible, it's better to use a professional power meter for accurate measurements. Using a dummy load and a power meter can only provide approximate data.
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