Making A Relative Power Measurement - Ladybug USB PowerSensor+ LB A Series Product Manual

LBXXXA Series USB PowerSensor+™
Product Manual PMA (Power Meter Application)

Making a Relative Power Measurement

The Offsets & Response menu allows comparison of an input to a reference value. The relative difference can be
displayed in dB. Complete the following steps to set a reference value:
1. Make sure the sensor is connected to the measurement setup establishing the reference value.
2. Activate the Rel(ative) button
change to "dB relative" as shown below. Click the Set Ref button below the display to establish the 0 dB reference
point.
3. You can change the reference level at any time by adjusting the source power then click the Set Ref button.
4. The display will now indicate power relative to this reference value in subsequent measurements and the REL
annunciator will be active. Relative power can be disabled as needed by clicking the Rel button on the toolbar.
Alternately, you can turn it on/off by selecting Offsets & Response > Relative Units On/Off from the menu.
Revision: 08/02/11
on the toolbar. The REL annunciator will appear and the power units will
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