Gigahertz Solutions NFA 1000 User manual

© Gigahertz Solutions GmbH April 2020
Made in Germany
NFA 1000
NFA 400
3D Low Frequency
Analyser
with Data Logger
NFAsoft
Analysis and
Configuration
Software
Operating Manual
Version 8.8
The THREE-dimensional potentialfree E-field measurement of the
NFA 1000 versus the ONE dimensional E field measurement of the
NFA400 is the only significant difference between the two instru-
ments.

April 2020 © Gigahertz Solutions GmbH
Made in Germany
Thank you!
We thank you for the confidence you have shown by buying this
product. It allows for a professional analysis of AC electric and AC
magnetic fields according to internationally recognized guidelines
and the recommendations of the building biology.
Technical data and specifications are to be found on our website
www.gigahertz-solutions.com.
Contents
1 Quick Start Guide 1
2 NFA 1000 Front Cover 2
3 LEDs / Display / Audio Signals 3
4 Switches / Push-Buttons / Connectors 6
5 How to Measure and Data-Log 12
6 Power Supply 15
7 „NFAsoft“ 17
8 Firmware-Update 24
9 What if… (FAQ) 25
Do not wipe or touch display foil !
After long-term recordings please charge soon in
order to avoid – harmful – deep discharge !
Do not leave in the hot car !
Protect from humidity or condensing air humidity !
This manual is based on firmware version 88 and NFAsoft version 172.
The firmware and software of the NFA will be continuously improved
and made available via download from our homepage.

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1Quick Start Guide
After switching on, the CPU boots, performs some self-tests and
then automatically starts measuring. After switching off, please do
not turn it back on while the status LED is red to allow the processor
to shut down properly.
Set all switches to their top position!
(Auto, tRMS, M3D and On)
With these settings you will achieve your first meaningful results
without further knowledge about the instrument.
The LCD display will now indicate the 3D magnetic field strength.
The coloured frequency LEDs above the LCD display show the
comprised frequencies. The dominant axis x, y or z is indicated by a
red LED on the right of the LCD display.
NFA 1000:
To measure the E-field with ground-reference simply connect the
grounding cable. The NFA detects the attached cable and automati-
cally shows the corresponding electric field strength and frequen-
cies. The ‘mode’ button toggles between this and the 3D magnetic field.
To measure the three dimensional potential-free AC electric
field, switch to E3D and fix the instrument onto a potential-free rod
or onto a support. The ‘mode’ button toggles between this and the magnetic Z-
axis.
NFA 400:
For an E-field measurement, simply switch to Ey.
If the grounding cable is plugged in and connected to the
ground potential, you are measuring “against ground”.
If you attach the meter to a potential-free rod or place it onto
a support, you are measuring “potential free”.
The ‘mode’ button toggles between this and the 3D magnetic field.
For data analysis …
… unzip NFAsoft, double-click and follow intuition!
Should the meter not do what you expect…
… Please have a look the FAQs (page 26ff).
Note:
To allow a simplified freehand measurement, the meter is pre-adjusted with a 16 Hz
high pass filter for the magnetic field and a 50 Hz high pass filter for the electric
field (see page 23 for measurements from 5 Hz onwards).

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2Front Cover
Analogous front cover for NFA 1000 and NFA 400
NFA 400: „Ey“
Technical data and specifications are to be found on our website.
12-15 V
Y
X
Z
Power
Signal
Made in G ermany
R
GIGAHERTZ
Mode
NFA 1000
3D-NF-Analyser
5 Hz - 1000 kHz
Freq.
AC/DC
Peak
Rec.
Mode
mV
nT
mG
V/m
Band
E3D
M3D
tRMS
Auto
XYZ
On
Off
Log
I/O
X
Y
Z
Hold
/
TCO-Band I II

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3Display / LEDs / Audio
3.1 Display and LEDs
When switched to “On”, the NFA will briefly show “bAtt” and the re-
maining battery life. When switched to “Log”, the remaining
battery life is shown cyclically with the elapsed log time and name
of the log file. After some self-tests the measurement starts auto-
matically.
Time indications are set up as follows:
„Xd.XX“: X days and XX hours or
„XX.XX“: XX hours and XX minutes.
„XX.XX“: (with blinking dot): XX minutes und XX seconds.
1 day, 12 hours is the specified minimum logging time. The real ca-
pacity can be higher, in particular with new batteries.
The unit of the reading shown on the LCD is
indicated by the adjacent green LED
A flashing LED indicates the unit of a secondary meas-
urement parameter, which can be selected by depress-
ing the “Mode>” button.
If the LCD range for the standard unit is exceeded, the
next higher unit is displayed, that is uT instead of nT
and Volt instead of mV. Additionally the color of the ad-
jacent LED changes to red and the “x 1000”-LED is also lit red.
LEDs to indicate the applicable frequency bands:
The frequency-LEDs change
their colour (“traffic light princi-
ple”).
”16.7 Hz“:In use for railway
lines in some European coun-
tries. The reading also includes
the 2nd harmonic.
”50/60 Hz“1:Mains frequency. The bandwidth only covers the individual frequency
of 50 Hz resp. 60 Hz with its lock-in range.
”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.
1The NFA automatically detects the mains frequency and adjusts the indication of
its harmonics. With “Freq.” the actual mains frequency can be determined exactly.
The LED’s for 16.7 Hz, mains frequency and its harmonics up to 2 kHz have a suit-
able lock-in range to cover mains fluctuations.

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”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 fre-
quency of the strongest source can be numerically 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.
Status LED
The “Status” LED indicates the current mode of operation
“Red” indicates special operating conditions. Do not switch off
while the Status LED is red!
“Yellow” means “measurement in progress, NO recording”.
“Green” means “measurement in progress WITH recording”,
Note: with the switch set to “Log.”, the “Status”-LED is switched off after a short
while, in order to extend battery life.
“x 1000”-LED
Turns red when the scale increases to the superior unit.
Special LCD Display Messages
“Low Batt“: Please recharge the battery a.s.a.p.
“Err.“ = short for ‘Error’: Indicates an inappropriate configuration.
This can occur when a grounding cable or mains adapter is con-
nected AND potential-free E-field measurement is selected.
„----“: Autocalibration in progress, processor busy, or the value is
too small to be measured reliably.
„CHAr“: Instrument is being charged.
„FULL“means: battery fully loaded or SD memory card is full.
„nbAt“:The processor cannot recognize the battery (see chapter 9)
OR the 15 V AC adapter should be disconnected (the batteries have
reached their maximum possible capacity. Storage at this capacity level is not advised)
„Sd-L“: short for SD memory card is Locked.
„Sd-F“: short for SD memory card failure“. Try re-starting the NFA
or re-formatting the memory card according to chapter 9, first para-
graph. If necessary, replace SD memory card (max. 16 GB).

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There are two display modes for the frequency-
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 fre-
quency 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 fol-
lows3:
RED = DOMINANT (> 50%)
YELLOW = MEDIUM (< 50%)
GREEN = SMALL (< 10%)
3.2 Audio Signal
The acoustic signal is always linked to the respective measured
value and has a „Geiger Counter” characteristic, i. e. an increasing
signal intensity will in turn cause an accelerated rattling sound.
If the “Mode”-switch is set to „ “,clicks on the ‘Mode >’ button
turn up the volume and clicks on the ‘Rec. >’ button turn it down
(and finally: off), as long as no grounding cable is connected to the
instrument.
Please note: For extra-precise measurement requirements turn the
acoustic signal volume down or even switch it off completely.
2In 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 in-
doors and can still be evaluated in the “band” mode. They can still be separately
evaluated with NFAsoft.
3To 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%.
/

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4Switches / Push-Buttons /
Connectors
4.1 On / Off switch (“Power“)
“On” = Standard Measurement Setting
Allow some seconds for self-testing until measurement starts auto-
matically. LEDs and acoustic signal are activated for full information
during manual measurements. They remain activated when you
start logging by shortly switching to “Log” until the Status-LED is lit
green and then back to “On”.
“Log” = Logging / long term recording
All LEDs and the acoustic signal are deactivated in order to save
battery life during data logging.
“Off” = Device is off
When turning off the device allow some seconds for shutting down
its operating system before switching it back on.
4.2 Field Selection for
3D Measurement
M3D = Magnetic field (3D)
The isotropic point or magnetic field sensors are below
the coordinate system printed on the meter faceplate.
The dominating axis is indicated by a red LED next to the
display.
XYZ = Axis indication
Here, the NFA 1000 will show either the magnetic or the electric
field in its three individual components depending on the field type
from which the switch was set to “XYZ”, whereas the NFA 400 will
only show the individual components of the magnetic field. Press
the ‘Mode >’ button to switch from one axis to the other. Please see
chapter 4.9 for details to this or to the automated scrolling.
E3D(NFA1000) / Ey(NFA400) = Potential-free E-field
The field sensor pairs for the X-, Y- and Z-axis (directions corre-
spond to the imprint) are situated within the meter close to the
housing. For a proper measurement the meter has to be set up
more than 12 inches away from any metal objects on an insulated
“holder” (accessory PM1) or held with an insulated rod (mounting
aid PM5s). Also cables or probes must not be connected during this
Y
X
Z

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measurement setting. In the case of an erroneous configuration, the
display will indicate “Err.” until the configuration is corrected or the
setting is changed to magnetic field measurement. The measuring
person should avoid hectic movements and keep a distance of at
least 1.5 m to the object of measurement. For potential-free E-field-measure-
ments the highest accuracy will be reached when used without the yellow silicone holster.
For E-field measurements against earth potential, please plug in the
grounding cable and
-switch to “M3D” (automatic adjustment) on the NFA 1000
-switch to “Ey” on the NFA 400.
4.3 Sockets for Inputs and Grounding
AC/DC = Combined AC/DC-Input
The moment you connect an external sensor, its
signal will automatically be displayed in mV and
logged if required. (“Mode” switch is set to “Auto”. Protected
against overvoltage).
AC: A displayed value of 2000 corresponds to an AC
signal of “1VRMS”.
DC: It can linearly display and log signals from +/- 0.1
to +/- 1500mV, i.e. with an HF59B connected and set to coarse (ad-
just to 1V), the values recorded will be between 1µW/m² and ap-
prox. 30,000 µW/m². The value will be displayed in mV4.
For logging RF please make sure to remember the settings of the
connected HF-Analyser, as they will not be registered by the NFA.
You may use the audio note feature for that.
Available options for the AC/DC Socket
Connecting cable for an HF-Analyser for data logging high-fre-
quency (KAB0053). Potentially falsifying LF- or RF-inductions can
reliably be suppressed by means of our suppression kit (EDY).
Electrostatic probe for measuring electrostatic charges of surfaces
(ES-NFA).
3D-magnetostatic probe for measuring the Earth’s magnetic field
and its distortions (MS3-NFA).
An AC signal being connected to the AC/DC socket will by default
be displayed as total RMS signal in CH4. For the analysis and miti-
gation of dirty power it is useful to have the signal of a current sen-
sor (“current clamp”) to be split into the frequency ranges of the
NFA (FA1). An example for an adequate current sensor is the MiniFlex MA 200
from Chauvin Arnoux.
4For all measurement ranges, even when using an attenuator or amplifier, NFAsoft
offers a comfortable conversion tool. The random noise will make it impossible to
properly display or record measurement values below 0.1µW/m², though.

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= Input socket for body voltage hand probe
Input for the connection of a hand probe for the measurement of
body voltage in mV. The connector is a 4 mm banana jack. For dis-
playing and recording, set the “Mode”-switch to and plug in
the grounding cable.
This is the only input which cannot be recognized automatically (be-
ing single-pole).
= Socket for the grounding cable
Allows the connection of a grounding cable for an E-field measure-
ment with reference to ground (in compliance with TCO). This will be
detected automatically by the instrument and the display will
change to E-field with reference to ground correspondingly.
Socket for the TCO-conformed probe at the front
end of the meter
This is for the TCO-conformed probe available as an optional ac-
cessory from Gigahertz Solutions. No data logging!
4.4 Mode = Selection of
Measurement Mode
Selects all measurement and display options of the
instrument with the field selector switch and the
“Mode >” button. Configuration errors will be de-
tected and indicated by “Err.” on the display until
resolved.
When set to the NFA recognizes probes
connected to it, and shows the corresponding val-
ues. If there is no external probe connected to the
instrument, it will show the selected 3D field type.
By pressing the mode button, you can “toggle” between the primary
and secondary display measurements. The secondary measurement
field is indicated by a short flashing of the corresponding unit-LED.
/
Mode
Freq.
Band
Auto
/

© Gigahertz Solutions GmbH - 9 - April 2020
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and = Display of the individual fre-
quency bands resp. the exact frequency5
Selection of the individual frequency bands is possible by clicking
the “Mode” button6. Please see chapter 4.9 for more details on this
feature or on automated scrolling.
= Capacitive body coupling / volume
In this setting, the display will show the signal generated by con-
necting a hand probe. The grounding cable needs to be connected
in order to assure proper measurements. For volume regulation
please see chapter 3.2.
4.5 Evaluation of Signal
= true RMS value
tRMS = “true Root Mean Square”. The values dis-
played and recorded can be compared directly to
classifications recommended by building biologists.
This is the standard setting of the NFA, even for log-
ging the peak values of an HF-Analyser.
= Peak value
Real peak value measurement: With this setting the meter measures
the highest culminating point of the wave7. A new, still experimental
measurement feature for building biologists which allows for a more
detailed analysis of the LF world in a way which has long since been
considered essential in the analysis of RF. This option supplies im-
portant information for the evaluation of “Dirty Power” (E-field > 2
kHz).
= retain maximum value
Retains „tRMS“ or „Peak“ of the signal, depending on the switch
position from which „Hold“ was chosen. When the signal switch is
set to „Hold“ only the reading on the display is held, the real time
value will still be recorded onto the SD card, if recording.
5An exact frequency indication is only possible up to 30 kHz.
6If the 50 Hz high pass filter has been set with the help of the configuration part of
the NFAsoft (maybe even as pre-setting), the 16.7 Hz LED will remain unlit. How-
ever, the filter only applies to the display in the “Auto”-mode and to loggings in the
“All3D”-channel. The aim is to tranquilize the display. Nevertheless, possible fre-
quency components up to 16.7 Hz can be displayed by using “Band” and “Freq.”.
7The resolution of the frequencies during the analysis of the (actually by their na-
ture broadbanded) peak values does not consider phase information that is being a
worst-case consideration. Tolerances are much higher than using the tRMS analy-
sis. It cannot be used with the floating potential E-field measurement for the time
being.
/
tRMS
peak
Hold
Signal
Peak
tRMS
Hold

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4.6 SD Memory Card
This is the slot for the SD memory card. To prevent
the card from accidentally being ejected, slide it in
beyond the external surface of the casing until it
snaps (use fingernail, if necessary). To extract it
press again to undo the snap mechanism.
Your PC will recognize the SD card as an external
device when the NFA is connected by USB cable or when it is slid
into a card reading device.
Use SANDISK’s standard SDHC-cards for best performance
(max. 16 GB!).
4.7 USB Socket
USB 1.0 computer interface connection: Used for me-
ter configuration with NFAsoft. Please take care to
have the NFA switched off when connecting or dis-
connecting the USB-cable!
Please note: for the time being the USB connection works for win-
dows and Linux only!
4.8 Charging Socket
15 V = charge
12 V = measure / log
Over the DC cables that connect the instrument with
the AC adapter, in certain situations the measurements can be falsi-
fied through stray LF signals or RF overcoupling. There are two op-
tions to avoid these falsifications:
the use of ferrites (of which we offer a low-cost do-it-yourself
solution (“EDY”).
the use of a 12 V external battery (motorcycle gel battery (no
lithium!8)), we have configurated a universal connecting cable
for you (“BAK-U”).
8Extensive testing with classical power banks and lithium polymer batteries for
flight models showed disappointing results.
1
2
-
1
5
V

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4.9 „Mode >“ and „Rec.“ - Buttons
for Navigation / Voice Recording
In connection with the “Mode”-switch (left side of the housing) and
the switch for selecting the field type, the “Mode” and “Rec.” keys
form part of the many special functions of this device.
They are not needed for a simple measurement of the 3D magnetic
field.
“Mode” = Toggle Displayed Reading or “Step
ahead”
The configuration of the “Mode”-button is context sensitive:
If the “Mode”-button on the left is set to “Auto”, the NFA recognizes
external probes connected to it, and displays their corresponding
values.
The “Mode >”- button toggles the display between the external
probe and M3D.
If no probe is connected to the NFA, “Mode >” toggles between
M3D and Ey or E3D and Mz, depending on your selection.
If the “Mode”-button on the left is on “Band” or “Freq.”,
Click the “Mode>” button to select the next frequency band (in-
dicated by the corresponding LEDs), and also the axis per band
in the “XYZ” mode.
Click the “Mode>” and “Rec>” buttons at the same time to dis-
play the individual axis one after the other in an infinite loop until
the “Mode>” button is pressed again.
“Rec” = Record an audio note
Keep this button pressed and so activate the internal microphone to
accept your live comments. The microphone is positioned above
the “Rec.” button (marked by the hole in the casing lid). It is suffi-
ciently sensitive to pick up audio comments from a few metres dis-
tance.
While the “Rec.” button is pressed for taking your notes, these will
be recorded in a standard WAV file parallelly to logging value re-
cordings. These audio notes will then be directly allocated by NFA-
soft to the corresponding recording times in the graphic.
In order to be correctly allocated by NFAsoft, the WAV files
need to be saved in the same folder as the LOG file.

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5How to Measure
and Data-Log
5.1 “Live”-Measurement
Of course the meter can be used the “conventional” way: simply
switch it on, set the required measurement parameters, and read
the values recorded. When operating in the conventional mode, the
“Status-LED” will be yellow.
In addition, the device is capable of logging all settings as well as
the measurement values of all four channels at once (i.e. the three
field axis values plus one additional channel). This data is stored
onto an SD-card for future analysis. This function can be activated
by temporarily switching the “Power” switch to “Log.” until the sta-
tus LED turns green. Then switch the “Power” switch back to “On”.
Please note: When logging with the power switch set to ”LOG” and
changing the field of measurement and recording (for instance from
M3D to E3D), this will cause the recording session to be closed and
a new log file to be created.
These recordings can be annotated by real-time audio recordings
which will be assigned automatically to the respective measurement
for replay.
The chapters 5.2 and 5.3 are only relevant for the NFA 1000.
5.2 Guided 9 Point Measurement
of Sleeping Areas
For alternating electric fields, the guidelines is-
sued by the VDB e.V., Germany, require a de-
tailed analysis of the floating potential electrical
field in sleeping areas, specifying nine points
(three each in the head-, torso- and foot area,
with the outer edge of the instrument located
10 cm off the bed’s edge). The NFA in combi-
nation with NFAsoft allows for a “guided meas-
urement” in order to efficiently accomplish data collection and eval-
uation.
Preparation and start of the measurement:
Use a potential-free rod (mounting aid PM5s) or the holder PM1
(stabilized by, for instance, a stiff piece of cardboard or a ply-
wood panel).
Switch the “Power”-button to “On” and choose “E3D”, “Auto”
and “tRMS” (choose M3D for magnetic fields).

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Press the “Mode”-button until 9Pt is indicated on the LCD and
then let go. A beep will indicate the activation of the 9 point
measurement.
The NFA guides the user through the nine points by means of short
audio signals (“beeps”). These nine points shall always be pro-
cessed in the same order, head area: left, middle, right, followed by
torso area: left, middle, right and finally feet area: left, middle, right.
The beeps are not time controlled but the NFA will adjust itself
to your personal work rhythm by “sensing” whether it is being
moved or it is lying still9. This way you can finish the nine point
measurement within less than a minute or – if you prefer to take
it a bit slower – you need not let yourself “be rushed through the
measurement by the beeps”.
The algorithm is as follows: after the activation (see above) the
NFA “waits patiently” to be moved (… that is being moved to the
first measurement position: top left) and it will not beep to con-
firm the next measurement before the instrument has been left
still in that position for a couple of seconds10 (… in order to pick
up a valid measurement). After the beep – and in your speed –
you can proceed to the next measurement position11.
PLEASE NOTE: In order to support this algorithm move the NFA
more or less rapidly from one measurement position to the next,
and “bump” it onto the bed’s surface with a little impact in order
to give the transition movement a clear end12.
For an analysis of the collected data use NFAsoft.
5.3 Guided 6-Point-Measurement
of Working Places
The NFA and the NFAsoft also support the
measurement of working places. In this case
six measuring positions are to be collected, as
shown in the drawing. For a selection of the
working place measurement on the NFA keep
the “Mode” button pressed until “6Pt” is dis-
played on the LCD. For the further procedure
follow the instructions of the 9-Point-Measure-
ment in the order: head, elbow, bottom, hands, knees, feet.
9The interval from beep to beep can vary between 3 and up to 20 seconds accord-
ing to your work rhythm and movement pattern.
10 This time delay is user-definable with NFAsoft.
11 After the beep the NFA will wait up to 20 seconds for a movement
12This way the NFA can distinguish more reliably whether it is in motion or kept still.
If you use a potential-free rod then try not to move the instrument after you have
“hit“ the measurement point, if you use a holder then withdraw quickly to a mini-
mum distance of 1.5 m and keep still there in order to avoid movement-induced
"pseudo-fields”.

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5.4 Long Term Data Logging
The interval for recording data is set to 10 full data sets/sec.
The approach in building biology is to record only the AC magnetic
field as tRMS.
Recording the E-field leads to little or no additional insight but often
produces confusing or meaningless results. Recording E-fields with
external power supply does not make any sense at all for obvious
reasons.
Initiating Long Term Logging of the Meter
For a long-term recording of several hours or days, set the “Power”
switch to “Log”. The status LED will turn green and long-term re-
cording will start off after a few seconds. In this mode the LEDs and
the sound are turned off to extend the battery life, after a while also
the green status LED. Even if you only want to document a short
measurement, please wait for the green status-LED to go out before
turning off the NFA, because only then you can be sure that data
has been recorded.
The display will show the logfile number (“L…”), the elapsed time of
recording as well as the remaining time of use in an infinite loop until
the battery is empty or the SD-card full. For information on the dis-
play format please see chapter 3.1. When switching back to “On”,
recording will be continued without interruption.
The instrument records all data corresponding to its field selection
switch. The fourth channel will automatically record the E-field if the
field selection switch is set to M3D and the AC/DC socket is not
connected. However, if an HF-Analyser is connected to the AC/DC
socket, it will automatically record the output of this external device.
“Locking” of the Instrument
“Locking” ensures that the instrument exclusively executes the pre-
defined tasks when left at the customer's place for long-term re-
cordings. To lock, remove and lock the SD memory card while the
desired settings are active and rein-sert it. The data will still be rec-
orded.
IMPORTANT: Don't forget to “unlock” the SD memory card after
finishing a “locked” long term recording!

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6Power Supply
6.1 Internal Rechargeable Battery
The instrument features high performance Lithium Ion recharge-
able batteries (2 x 3.7 V). When fully charged, they will last for at
least one day and 12 hours of data logging13.
A vital factor for the durability of Lithium Ion rechargeable batteries
is to absolutely avoid a deep discharge and also avoid storage
when charged to a maximum. Ideal would be a loading state of
around 75%.The NFA setting will prevent a deep discharge in oper-
ation, however, in view of the inevitable self-discharge, the meter
should never be kept with “almost empty” batteries.
Shelf life without deep discharge with initially ¾-full batteries:
3 to >9 Months (the big variations are caused by the varying “off-line” power
consumption of SD memory cards
>3 years with disconnected SD memory card
For longer storage the batteries should be disconnected from the
instrument.
6.2 Charging
To charge the batteries use the 15 V AC adaptor. If the device is
switched off while charging, the display will show “CHAr” and the
estimated running time in the log mode with the current capacity
status. Measurements or recordings during the charging process
are technically possible, but this is no specified status and thus not
recommendable.
When fully loaded, a maximum of one day and 15 h running time will
be displayed (“1d15”). Mostly, longer times can be achieved, but
this should be considered as “hidden reserve”. Due to the large vari-
ation in the Lithium Ion batteries supplied by their manufacturer, the
maximum capacity as well as the charging time are subject to fluc-
tuations.
The specified battery life is already reached after a charging period
of approx. 8 hours. A (significantly) longer charging period may con-
siderably extend the battery running time.
The maximum capacity will be reached after roughly 15 hours and is
indicated by a “FULL” on the display.
“nbAt” on the display indicates that the 15 V AC adapter should be
disconnected in order to save the long term battery “health”.
13 Please note that Li-Ion batteries, even when treated with care, will lose some of
their original capacity within one or two years, and their typical life expectancy is
250-500 complete charge cycles. In this case please always replace both batteries.

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Made in Germany
6.3 Data Logging with
External Power Supply
You can perform this task with the supplied 12 V AC adapter.
However, unfavourable conditions may cause falsifications of the
measurement through noise, dirty power or RF over coupling. In or-
der to be on the safe side there are two options:
Ring ferrites attached to both ends of the respective cables avoid
these falsifications (available from us as a low-cost do-it-yourself
solution “EDY”).
Another solution for avoiding these falsifications is the use of an ex-
ternal 12 V battery for off-grid long-term recordings. Most suitable
for this purpose are standard gel or AGM (motorcycle) batteries (no
lithium!14). We have configured a universal adapter cable for you
(“BAK_U”).
The maximum size of a log file that can be opened with NFAsoft
(1GB) is reached after 16 days of continuous recording. The longer
the logging time exceeds the specified 36 hours, the higher the risk
of an unwanted shutdown – mainly caused by the internal electron-
ics of the SD memory card. Longer logging times can therefore not
be guaranteed.
Measuring / recording E-fields with an AC adapter or external
battery connected – by physical principals – results in meaning-
less data.
6.4 Battery Change
For safety reasons, please only use original battery packs classified
by us (integrated protection circuit). The two battery cells fit tightly,
but can – with some patience – easily be removed for the purpose
of battery change. In no case untighten the screws of the meter!
Putting the meter together is very complicated, and therefore sub-
ject to a fee if it needs to be done by one of our technicians.
In order to calibrate the battery life indication on the display, the
newly connected batteries need to be either charged until
“FULL” appears on the display OR discharged until the NFA
switches itself off automatically.
14 Extensive testing with classical power banks and lithium polymer batteries for
flight models showed disappointing results.

© Gigahertz Solutions GmbH - 17 - April 2020
Made in Germany
7„NFAsoft“
The provided software allows...
for the analysis of the data logged by the NFA
for the configuration of the NFA according to your preferences
and habits.
A double-click on the program-icon
opens the window shown on the left.
Here you can chose between the tool for
the analysis of the data and the tool
for the user-specific configuration of
your NFA .
The software is subject to continuous upgrade. The most current re-
vision can be downloaded from our homepage.
System requirements
NFAsoft is made for Windows (98 and up higher). Linux and Mac
versions are provided “as is”. NFAsoft requires no installation –
just pull to location of your choice, double-click and start!
In some cases, it might be necessary to temporarily disable
your anti-virus software. Anti-virus software may interpret NFA-
soft as a threat and hence might disable or even erase it. It may be
necessary to repeat this upon loading an upgraded version of NFA-
soft. NFAsoft can be loaded and executed directly form the SD
memory card through a card reader or through the USB interface
cable. The NFA is supplied with a “Class 6 SDHC”-SD memory card
(appropriate readers have been available since 2008, adapters are
available for older computers).
7.1 Data Analysis: File Types
A click on the button opens the program and a Win-
dows-box for file selection. The following file types are
available (the consecutive numbering is independent from
the file type)
LOG00001.TXT log file (long time recording)
LOG00002.9PM 9-Point-Measurement (sleeping area)
LOG00003.6PM 6-Point-Measurement (workplace)
REC00004.WAV audio file (recorded note).

April 2020 - 18 - © Gigahertz Solutions GmbH
Made in Germany
7.2 Data Analysis: Longterm Recording
Double-click the appropriate log file for analysis. For longterm re-
cordings the following window will open (check chapter 7.2 for 9
point measurements):
- The far left column la-
belled “Channels“ dis-
plays statistic evaluations
of the plot on the right (in
real-time)
- The graph shows the
collected data over time.
- The “x” (horizontal) axis
of the plotted data is the
time scale and the “y”
(vertical) axis shows the units of measurement corresponding to the
field of measurement.
Plotted Data Window
Units of measurement appear on the corresponding
channel window on the left and are not indicated on
the y-axis. The different plots are colour coded.
This allows for different channels to be shown sim-
ultaneously.
The x-axis indicates the time span. The figures at
the left and the right end of the grey status line show the times of
start and end of the logging period.
If the status line is mouse clicked, the window on the right will ap-
pear. Here one can enter a preferred time span to view. The time
span can also be selected in the “View” menu.
The colouring scheme of the plot corresponds to the standards for
building biology measurements (SBM2015):
Green for “no concern”.
Yellow for “slight concern”.
Red for “severe concern”.
Purple for “extreme concern”.
If one selects two channels with different units, the SBM colour
scheme of the plot’s background will be the one corresponding to
the unit of the selected (= bold) channel. It will be bold for the one
and regular for the other, equalling the markings in the “Channels”
window.
Navigation within the Plotted Data
Within the plotted data you can easily navigate using a mouse and
its scroll wheel. Move the mouse pointer into the data plot. The
scale of the x-axis will be
zoomed in when scrolling up or by using the “Up Arrow”,
zoomed out when scrolling down or by using the “Down Arrow”