Gigahertz Solutions NFA 1000, Руководство по эксплуатации

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Made in Germany
© Gigahertz Solutions GmbH
- 7 -
May 2017
”100/120 Hz“
1
: This LED indicates the contribution of the
second through fourth “even” harmonics.
The strongest frequency
can be numerically displayed when using “Freq” mode.
”150/180 Hz“
1
: This LED indicates the contribution of the
third through fourth “uneven” harmonics.
The third harmonics will
presently be found in many homes and most offices as a significant portion of
the total measurement. The frequency of the strongest source can be numerical-
ly displayed when using “Freq”.
”R < 2kHz“ : Means “Remainder of frequencies below 2
kHz”.
This LED does not show the whole band, but only the sum of all frequencies
below 2 kHz which are not covered by the LEDs on the left.
”> 2kHz“ : Comprises frequencies within the upper TCO-
band of 2 KHz up to 1 MHz.
“x 1000”-LED
Turns red when the measurement scale increases.
There are two display modes for the fre-
quency-LEDs :
“ Simple/Steady “: (= preset)
2
The red LED represents the strongest frequency , and the
yellow LED the second strongest. The green LEDs indicate
the total frequency range in the current setting.
“ Full Information/Volatile ”: This makes the LEDs rather un-
steady/volatile. (To be configured with NFAsoft)
The proportion of the respective frequency band in relation
to the total signal is being displayed. These proportions are
shown as follows
3
:
RED = DOMINANT (> 50%)
YELLOW = MEDIUM (< 50%)
GREEN = SMALL (< 10%)
2
In order to allow for less fluctuations in this mode an internal high pass filter is
switched on. With NFAsoft it can be configurated to 16.7 and 50 Hz. Experience
has shown that the best combination for a freehand measurement is a filter set
to 16.7 Hz for magnetic fields and to 50 Hz for electric fields. Electric fields of the
16.7 Hz railway line power frequency (in some European countries) are quite rare
indoors and can still be evaluated in the “band” mode. They can still be sepa-
rately evaluated with NFAsoft.
3
To make it more ergonomic for the user, frequencies below the nominal display
resolution (that is < 0.1 V/m or < 1 nT) are not indicated by an LED-signal but will
still be recorded down to the noise level. Hysteresis: 9/12% resp. 45/50%.