EXFO IQS-1600 High-Speed Power Meter for IQS-500/600 - Manual (Page 83)

Performing and Analyzing Graph Acquisitions
High Speed Power Meter 75
Setting Up Graph Parameters
To change the base unit of the acquisition (dBm or watts):
Use the arrow buttons in the Settings tab to toggle between them.
If you set the base unit before performing an acquisition, you will have the
choice between W, dBm, dB, and W/W. If you change the unit while an
acquisition is in progress, you will only have the choice between absolute
units (dBm or W) or relative units (dB or W/W), depending on your base
unit at the start of the acquisition.
If you have selected either W or W/W as the base unit, the Displayed Unit
list becomes available, and you can change it during the acquisition using
the arrow buttons, depending on the sub-unit that suits the current
situation. For example, if at the beginning of the acquisition, no light goes
through, the display will be in pW. When light goes through, you might
want to switch to μW or nW to get a more appropriate reading.
To change the displayed time scale:
Use the arrow buttons in the Settings tab to increase or decrease the
value. The display will change accordingly.
To show or hide the grid in the background of the graph display:
Click the corresponding button in the Settings tab.
I
MPORTANT
If you change the base unit after acquiring data, you will lose the
graph you have obtained, as well as the data acquired. Ensure you
set your values before acquiring data.
I
MPORTANT
If you change the base unit, the channels in the Display tab will
automatically change when you switch from a relative unit to an
absolute unit or vice versa.