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S:\HP83206A\USRGUIDE\MANUAL\getstart.fm
Chapter 1, Getting Started
Get ready to test
HOW OFTEN
SHOULD YOU ZERO
THE AVERAGE
POWER METER?
A frequently zeroed Test System will ensure the highest measurement accuracy.
The Zero Power function measures the input power with no cables connected to
the Test System. The input power is measured for all gain settings. These
measurements are stored in static RAM, and the Test System uses them to
calculate any offsets when measuring power with a DUT attached. The values are
updated whenever you zero the power meter, and the latest values are stored for
the life of the static RAM backup battery.
You should zero power frequently if the Test System is still warming up, about
two to three times within the first two hours. You should zero power occasionally
even if the Test System is on continuously. (Occasionally can mean daily, weekly
or monthly, as you choose).
Zeroing TX Power
TX Power and Average Power are different measurements. TX Power is zeroed by
running a ROM program in the Test Set when the Cellular Adapter is attached.
See “TX Power” on page 139 for a description of the TX Power measurement.