Textronix sbt250 spectrum analyzer
The RBW is tied to the current span. You can
find the RBW by clicking on setup ->edit. The RBW for the current
will be display. The narrowest RBW is 100 Hz. A table of span
resolution bandwidth, temperature:
When nothing is plugged in Tsys is:
With 100 Hz RBW the Noise floor is -150 dbm/100 hz or -170dbm/hz
-198.6dbm/hz =1K so the the analyzer is 28.6 dbm above 1K.
Tsys= 10^(2.86)= 724 K.
You can store a trace on the local disc in ascii.
you can read in the data and generate the x,y that was used for the
trace. This lets you computer process the data offline (rather than
having a screen dump plot to look at). The steps are:
Storing traces so they can be read back:
It the above wrote to the hard disc rather than the floppy, you can
the file on the hard drive to the floppy with:
File -> Save trace as
select tab separated txt (.txt)
enter the filename you want. You can bring up the keyboard using the
keyboard icon in the menu bar at the lower right. (can we save it
to the floppy?)
got to start button start->progs->start floppy drive. Supposedly
select floppy as the output device...
click on file, select the file you want to copy. Should be in the
MyNetTek -> yb250 ->?? -> appData->Results->filename
start -> programs -> start floppy drive
MyNetTek -> yb240 ->?? -> appData->Results->filename
copy command ???
paste to floppy
Reading the floppy in and generating the x,y array...
Read the floppy onto linux. I've had better luck with reading it from
and then emailing it to myself on linux.
filename='xxxxxxx.txt' .. the name of the file on linux
For more info see the idl
documentation for ybt250inp().