4.2 Controlling the PM100A
17
4.2.3.5 Relative Power Measurement
The Δ key switches on and off the relative measurement mode.
The main display will set to zero and gets signed, the offset and the absolute power
value will be displayed in two sub displays in negative presentation. The analog
needle will deflect to the middle position with bidirectional amplitude (0 at the scale
below the mirror) and change to the next sensitive scale.
P = absolute power level P
0
= offset power level
bidirectional needle
Scale (± 100µW)
signed delta power level
Figure 9 Relative Measurement
4.2.4 Display Options
The PM100A can toggle between the standard measurement screen and a statistics
screen by navigating to the MENU item and pressing one of the or keys.
The statistics screen shows the actual, minimum, maximum and average power
level. The HOLD/RUN soft button in the display menu controls this feature. When
the item has focus, the OK button toggles between run and hold mode; in hold
mode, the device samples in the background.
The or key resets all items to the actual power level and restarts sampling.
Ranging during the sampling is possible, though once the actual level exceeds the
measurement range, the stored and calculated values will show „High‟.
Press.
or
Figure 10 Display Options
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