4.2 Controlling the PM100A
14
4.2.3 Power Measurement
4.2.3.1 Range and Scale Control
4.2.3.1.1 Measurement Range Control
Navigate to the topmost menu item R -.-- -W ; 6 power corresponding current or 4
power corresponding voltage ranges can be adjusted manually with the or
keys. Pressing the OK key the unit performs a nonrecurring auto-ranging until the
optimum range has been found for the currently measured power level. The range
control menu item indicates the particular full range value in Watts.
A permanent auto-range mode is only available in remote operation.
4.2.3.1.2 Needle Scale Control
After setting the measurement range the unit automatically selects the needle scale,
where the full power range is covered. To change the needle scale navigate to the
S -.-- -W menu item. With the or keys the scale can be optimized to different
end scales for best readability of the power value (zoom function). This adjustment
can also be automated by pressing the OK key. The scale control menu item
indicates the particular full scale value in Watts.
The scales end have a fixed 1 – 2 – 5 grid, therefore it is possible that the full scale
range may be higher than the power range. In such a case, when the power level is
exceeding the power range, the needle will deflect to the right stop and the readout
value will indicate „HIGH‟.
4.2.3.2 Wavelength Correction
Most power and energy sensors show a dependent behaviour in their spectral
response. For accurate measurements it is important to set the PM100A to the
wavelength of the light to measure.
Pressing the λ key leads to a wavelength menu with 8+1 individually configurable
sensor independent settings. The currently set operating wavelenght is indicated by
a following arrow () and has focus when entering the menu. Select the desired
operating wavelength by navigating with the keys and confirming with OK.
The λ key allows to exit without changing the operating wavelength.
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