Operating the R&S
QAR
R&S
®
QAR
38
User Manual 1178.7200.02 ─ 04
Working with evaluation masks
The evaluation mask available for the reflection measurement defines the area that is
evaluated for the mean reflection and the standard deviation of the reflection measure-
ment.
1. Select "Edit Mask".
In editing mode, you can change the shape and location of the evaluation mask.
2. Move, delete or design an evaluation mask.
a) Move the mask by dragging it around with the mouse and dropping it in its new
location.
b) Delete a selected mask with the "Del" key on your keyboard. To select a mask,
click on it.
c) Create a mask by clicking somewhere in the result display and drawing a line
with the mouse.
One click confirms a line of the mask shape. Add as many lines as you like to
design the mask. A double-click confirms the final shape of the mask.
Using that method, you can design any shape you like around the DUT.
3. Select "Edit Mask" again to exit the editing mode.
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).
Radome Measurements
