Sd Memory Card - Gigahertz Solutions NFA 30M Operating Manual

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4.4 Evaluation of Signal
tRMS = "true Root Mean Square". The values displayed and record-
Signal
ed can be compared directly to classifications recommended by
building biologists.
tRMS
This is the correct standard setting of the NFA, even for logging the
Hold
peak values of a connected HF-Analyser.
Peak
Peak = Real peak value measurement: With this setting the meter
measures the highest culminating point of the wave
measurement feature for building biologists which allows for a more detailed analy-
sis of the LF world in a way which has long since been considered essential in the
analysis of high frequencies. This option supplies important information for the eval-
uation of "Dirty Power" (E-field > 2 kHz).
Hold = Hold maximum value ("Max hold"). 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 is
still recorded on the SD card, if recording.

4.5 SD Memory Card

This is the slot for the SD card. Insert until it snaps (use fingernail or
pencil, if necessary). To withdraw, press again to undo the snap
mechanism.
The high-speed SD memory card (4 GB, SDHC) supplied with the
instrument contains the current version of the NFAsoft software and
enough memory for several 36h recordings. Important: Please make sure to only use
SANDISK cards! We have had a lot of bad experiences with other manufacturers.
Your PC will recognize the SD card as an external device when connected by USB
cable or inserted into a card reading device. It can then be processed with the
standard functionality of your operating system. Inserting the SD memory card di-
rectly into the card reader of the PC will result in a 40 times faster data transfer than
if using the USB cable
Please note: Do not remove the SD memory while the NFA is running!
3 The resolution of the frequencies during the analysis of the (actually by their nature broadbanded) peak values
does not consider phase information that is being a worst-case consideration. Tolerances are much higher than
using the tRMS analysis.
4
In order to make use of this speed advantage, your SD card reader needs to be specified „SDHC" which is
standard for units built 2008 or later. For older units inexpensive adaptors are available.
February 2016
4
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3 . A new, still experimental
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