LBXXXA Series USB Powe
™
Product Manual PMA (Power Meter Application)
Revision: 08/02/11
- 27 -
The Toolbar
The toolbar is shown below. Notice that each toolbar button has a label if you hover over it with the mouse cursor. The
toolbar buttons are like hot keys that duplicate many of the menu selections or actions and make it easier to
manipulate the meter settings. Each function is accessible from the menu bar and some toolbar buttons are simply
switches.
More detailed descriptions of the toolbar buttons are listed below. Graphic examples of the toolbar functions follow in
sequence after that starting with
Averaging
.
Mode:
Switch between Average (CW) and Pulse Power modes of operation. This button is not present for LB5XXA.
Power:
Select the power units (dBm, dBW, dBkW, dBuV, dBmV, dBV, W, V, dB Relative).
Frequency:
Select the frequency units (MHz or GHz). The center frequency
must
be updated when the incoming
signal frequency changes as this frequency setting is used to correct amplitude for frequency variation. The best
measurement accuracy requires the frequency to be set and not doing so can be a significant source of error.
Averaging:
Select averaging from 1 to 30000 measurements. The number of averages depends on signal stability
and power level. More averaging may be required for low-level signals. Increasing the number of averages also
increases the measurement time.
Extended Averaging:
Set, enable, reset extended averaging from the drop down. Extended averaging should be seen
as an adjunct to averaging. Extended averaging is an exponential average of the last n readings where n is the
number of extended averages. This function is reset by the front panel button labeled
Rst Max & XAvg
. This button
resets or restarts both the max hold and extended averaging functions.
Max Hold
:
Retains the
maximum measured value until reset or deactivated. For pulse measurements, each reading
(Pulse, Peak, CrF, Avg, DC) is held at its maximum value independent of the other readings. This function is reset by
the front panel button labeled
Rst Max & XAvg
. This button resets or restarts both the max hold and extended
averaging functions.
Anti-alias Control:
The toolbar button is toggle on/off. Enable anti-alias control for input modulation bandwidths
greater than 200 kHz. Disable it for modulation bandwidths less than 200 kHz.
Offset Correction:
The toolbar button is toggle on/off. The
Offsets & Response
setup menu allows gain or loss
offsets to be entered as part of the measurement setup.
Frequency Response Correction:
The toolbar button is toggle on/off. The
Offsets & Response
setup menu allows
frequency dependent gain or loss offsets to be entered as part of the measurement setup.
