[Elecraft] OT-Wattmeter Errors

[Brian Alsop]

Interesting review of five commercial wattmeters in March QST. 
Power levels from 5 to 1000 watts and frequencies from 2 to 50 MHz.

For CW:
Most are within +/-10% at 100 watts.
Many are way off at 5 watts (as much as 70%) and 1000 watts (up to 24%)

Bottom line: Hard to measure watts accurately over a wide 
frequency/power range-- even with a pure resistive dummy load attached.

Do you believe yours?

Article notes +/-5% is typical for lab grade wattmeters.

73 de Brian/K3KO