Start Plot at Zero checkbox

[k7buc]

I must have missed when this was added. The ability to start the plot from zero is nice.
Also, like the ability to custom cal down low. It sure does take some time but nice to have anyway for messing with my low freq ferrite xfmrs and filters.

I am seeing an error fairly often that the internal voltage is 9.76 or something like that, and it must be 10.xx to operate properly. I am using the supplied wall-wart so doubt voltage is an issue.
Resetting the AIM stops the error, so I'm assuming its firmware issues.
Also, sometimes the AIM just shuts down. Auto Power Down is off in the setup.
-Del

[Bob]

Hi Del,
I'm sorry you're having a problem.
Please send me this information:
1. Exact wording of the low voltage error message or a screen shot if possible. The internal voltage limit is normally 5.5V.
2. Your latest *.ini file.
3. Your latest versionxxxxxxx.txt file.

--73/Bob

[k7buc]

Thanks, Bob.
I'll email it to you.
Hmmm. It allowed me to custom cal way down to 0.01 mhz, but thats probably not valid? The program said the acal file was from another unit when I tried to load it. Restarting the program along with reboot of the 4170 fixed that, and the file is now properly read and used.
By the .txt file docs, I should not try to go lower than 100khz, is that correct?
-Del

[Bob]

There was an error in the freq limit checking that made the custom cal act up at the high end. I've fixed that now.
Thanks for the feedback.

With the regular cal, measurements are good up to 180MHz. With the new version, custom cal will be ok up to 180 MHz too.

On the subject of calibration, note that when measuring very high impedances of several Kohms, you may get better results by using a standard cal resistor that is larger than 50 ohms. I've noticed better results on a 5K ohm resistor when using 200 ohms for cal. If you make another cal resistor, be sure to use the same type of connector and/or adapter for the short and open cal loads too. Even 1pf can make a noticeable difference.

-- 73/Bob

[k7buc]

Thanks, Bob. I was beginning to think it was my imagination.
Will be looking for the new version.
73
Del