Made in Germany
© Gigahertz Solutions GmbH
- 5 -
NFA1000_4.6_e.doc as of July 2010
4.2 Status and Frequency LEDs
“Status” LED
The Status LED indicates the current mode of operation:
“
Red
” means “AC-adaptor is connected”. No measurement possible. The display
shows „CHAr“ whilst charging and „FULL“ when fully charged.
“
Yellow
” means “measurement in progress, NO recording”. Either there is no SD
memory card in the instrument, or it is full or not functioning. Or NFAsoft has been
applied with the presetting that measurements are to be done without recordings.
“
Green
” means “measurement WITH recording”. However with the switch set to
“log.” the Status LED is switched off to extend battery life.
LEDs to indicate the applicable frequency bands:
The frequency-LEDs change their colour in propor-
tion to their contribution to the total field strength.
The traffic light principle also applies here.
”16.6 Hz“:
In use for railway traction. The reading
also includes the first overtone.
”50/60 Hz“
2
:
Mains frequency. The bandwidth only
covers individual frequencies of 50 Hz and 60 Hz with their respective lock-in
ranges.
”100/120 Hz“:
This LED summarises the contribution of the first 6 “even” harmon-
ics. These are pointers to bigger electric motors (such as washing machines). Small
electric motors by virtue of their design don’t normally produce them. The frequency
of the strongest one of them can be numerically displayed when using “Freq”.
”150/180 Hz“:
This LED summarises the contribution of the first 6 “even” harmon-
ics. These are pointers to DC power supplies, chargers for PCs, etc. AC power sup-
plies (e.g. for halogen lamps) do not generate them. The third harmonics will nowa-
days be found in many homes and most offices as a considerable fraction of the
total. The frequency of the strongest one of them can be numerically displayed when
using “Freq”.
”R < 2kHz“
: Means “Remainder 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 above the upper TCO-band up to 1 MHz.
2
The “60”, “120” and “180” stand for those countries with a mains frequency of 60 Hertz. The “50”, “100”
and “150” stand for those countries with 50 Hertz mains frequency. There is no country-specific choice
necessary, with “Freq.” The actual mains frequency can be determined exactly. In order to avoid conflicts
allovating the harmonics, the underlying mains frequency is continuously monitored and the harmonics
allocated accordingly. The LED’s for 16.6 Hz, mains frequency and its harmonics up to 2 kHz have a suit-
able lock-in range to cover mains fluctuations.
