So looking at the manual and the commands:
select CH1=50R,input 10M 0dBm
$E4040*
select CH1=50R,input 10M -20dBm
$E4141*
Just guessing but the process is to run the $E4040* command while the FA-2 is powered up and connected on Ch1 at 50 Ohms to a reliable generator outputting 10 MHz at 0 dBm? Then save and exit? Then repeat with $E4141*while the generator is running at -20 dBm? Then save and exit?
Save and exit might be $E2020* ?
Thanks
Not quite... the $Exxxx commands do the work and save the results. So just connect the proper signal and issue the appropriate $Exxxx command.
So I can see all the 10 MHz counter readings scroll by in terminal mode on the PC (via USB connection). I've turned off the FA-2 and entered the $E4040* command while the generator is outputting 10 MHz at 50 Ohms on Ch1 and then turned the FA-2 on but that didn't work. What's the process for uploading the commands from the PC to the FA-2? Thx
Edit:
Figured it out.... Seems to be working! Thanks!!
Looks to now be within 0.1 dBm; fluctuates between 0.0 and 0.1 dBm of mirroring the generator settings for both 0 dBm and - 20 dBm.
On a scale of 1 to 10 that is about a 10.
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
For anyone else trying the process, a few details.
Connect the FA-2 on Ch1 at 50 Ohms to your generator outputting 10 MHz at 50 Ohms at 0 dBm.
Connect the FA-2 via a USB port.
Open a terminal program on your PC.
If it's working on the right com port you will see the 10 MHz counter readings scroll by.
Open MS Word and enter $E4040*
Save the file as a .txt file named E4040 (or some acceptable characters).
In the terminal program use the "send a text file" command to upload the E4040 text file.
You will see an acknowledgement of the calibration text file going by among the scrolling counter info in the terminal program.
Notice that the dBM reading on the FA-2 is now very close to 0 dBm.
Repeat the process at -20 dBm.
You should be good to go with not only pretty accurate frequency counting on the FA-2 but also pretty accurate dBm power readings.
BG7TBL Rocks! and texasypro too!
EF