Operating the R&S
QAR
R&S
®
QAR
45
User Manual 1178.7200.02 ─ 09
The R&S
QAR reevaluates the mean reflection and the standard deviation.
4. Optional: Export the evaluation mask.
a) Select "Options" > "Reflection Mask"
b) Select "Save Bitmap" to save the shape and location of the mask as a bitmap
(
.bmp
file).
c) Select "Export Coordinates" to save the shape and location of the mask as
coordinates in a
.json
file.
Alternatively, you can design a mask with an external graphics editor or a text edi-
tor and import it.
If you design the mask as a bitmap, make sure that the canvas size is 601 x 601
pixels, and that the image has a single channel. Take a mask you have designed in
the application to see what a bitmap looks like.
If you design a mask as text, make sure that you define the coordinates of the x-
and y-axis correctly. Take a mask you have designed in the software to see what
the
.json
file looks like.
Importing evaluation masks
If you have designed and saved an evaluation mask previously, you can import it any
time you need it.
Before importing a mask, make sure that the mask editing mode is off.
1. Select "Options" > "Reflection Mask"
2. Select "Load Bitmap" to import the shape and location of the mask from a bitmap
(
.bmp
file).
3. Select "Import Coordinates" to import the shape and location of the mask from
coordinates in a
.json
file.
Selecting the image color scheme
The R&S
QAR provides several color schemes for the image of the reflection measure-
ment.
1. Select "Options" > "Display".
2. Select one of the color schemes from the "Colormap" dropdown menu.
The R&S
QAR adjusts the colors accordingly.
Defining an evaluation grid
Requires R&S
QAR-K20.
An evaluation grid helps you to find the areas with highly differing reflection coefficients
on your DUT more easily. The principle is to divide the DUT into several small areas
(cells), and evaluate the characteristics of each cell separately instead of the complete
DUT.
Before you can start to evaluate results based on a grid, you have to design a grid.
Radome Measurements