LBXXXA Series USB Powe
™
Product Manual PMA (Power Meter Application)
Revision: 08/02/11
- 32 -
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
on the toolbar. The REL annunciator will appear and the power units will
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
.
