Gigahertz Solutions NFA 30M Operating Manual page 22

Made in Germany
No long-term recording over several hours or days
possible
Association (to be found under the follow-
https://www.sdcard.org/downloads/index.
The meter turns off after quarter of an hour
The sum of the frequency specific channels is higher
than the value of "All3D"
The signals of the different frequencies are added up as
square root out of the sum of squares, which means
that a simple addition of the individual signals will result
in a higher value than the sum of "All3D". For example,
if you take 500 nT at 16.7 Hz plus 1000 nT at 50 Hz, a
simple addition will amount to 1500 nT, whereas the
quadratic addition (= "All3D") will amount to only 1118
NFAsoft is showing measurement values at 16.7
Hz in spite of the 50 Hz high pass filter being set
AND the sum of the 16.7 Hz channel and the
other channels is higher than the value of
"All3D"
If the 50 Hz high pass filter has been set with the help of
the configuration part of NFAsoft (maybe even as pre-
setting), this only applies to the channels "All3D", "AllX",
"AllY", and "AllZ". Nevertheless, possible frequency
components at 16.7 Hz will also be recorded in the cor-
respondent channel. In this case the sum of the frequen-
cy specific channels may well be higher than that of
January 2018
Solution 1: Update your firmware.
Solution 2: There is a file system error on
your SD-card. In this case, save the
"good" files and re-format your SD-card
using the original SD-formatter of the SD
NFAsoft allows you to change the inter-
val for the auto-power-off feature. (Au-
to-power-off is deactivated while re-
- 20 -
ing link:
html).
cording!)
nT.
"All3D".
© Gigahertz Solutions GmbH