Hello!
I have a problem with reading the specifications on 438A power meter
The zero set spec. is "+/- 0,5% of full scale on most sensitive range. Decrease percentage by factor of 10 for each higher range +/- 1 count." I am a little confused with the +/- 1 count is this the resolution of the meter?
i.e. at 1 mW range 3 (auto filter) will the worst deviation be 0,005% of 1 mW multiplied with the resolution 0,001 mW equals 0,00105 mW?
When calculating the uncertainty of the measurement will the resolution of the meter be a separate component or is this already included with the +/- 1 count specification on the zero set?
Thanks!
I have a problem with reading the specifications on 438A power meter
The zero set spec. is "+/- 0,5% of full scale on most sensitive range. Decrease percentage by factor of 10 for each higher range +/- 1 count." I am a little confused with the +/- 1 count is this the resolution of the meter?
i.e. at 1 mW range 3 (auto filter) will the worst deviation be 0,005% of 1 mW multiplied with the resolution 0,001 mW equals 0,00105 mW?
When calculating the uncertainty of the measurement will the resolution of the meter be a separate component or is this already included with the +/- 1 count specification on the zero set?
Thanks!
yes, it means +/-1 count in the least significant digit using the current resolution.
>When calculating the uncertainty of the measurement will the
>resolution of the meter be a separate component or is this already
>included with the +/- 1 count specification on the zero set?
the 1 count uncertainty is usually much smaller than, and absorbed into, the "instrumentation accuracy" spec.