Aaronia SPECTRAN HF-2025, Руководство пользователя

Страница: 27 / 72

7.12 Hold (activate HOLD mode)
With On , you can activate the HOLD mode and the Mode status field will read
“HOLD”. With Off , the HOLD mode is turned back off.
In HOLD mode, the spectrum display does not get erased anymore, thus all
measured signals (peaks) stay visible all the time . In this mode, the display can
only be overwritten by even stronger signals.
Likewise, only the highest three markers since the activation of HOLD mode will
be displayed, along with their frequencies and levels (in dBm).
As such, the
HOLD mode in SPECTRAN turns into a true “Jack of all trades” and
is also called “ ADVANCED HOLD” mode:
You can use this mode to create full-day diagrams : Simply leave SPECTRAN
in HOLD mode for e.g. 24 hours and the next day, you will see exactly what hap-
pened in the past 24 hours. In the same way, you can use it as an
“EVENT-
RECORDER” should you want to catch signals only occurring in certain inter-
vals: Simply leave SPECTRAN running in HOLD mode until it caught the result.
Another situation where HOLD mode is indispensable is the “panning
approach” described in the following chapter.
Another situation where HOLD mode is very helpful is exposure limit calcu-
lation : You can use the readings acquired in HOLD mode for quick and easy
comparison with exposure limits - without acquiring new readings, as even the
markers along with all information are stored. Simply switch to exposure limit
calculation mode after the measurement, and you can instantly see the results.
HINT: You can also turn HOLD mode on/off by using the Dot key (erase
memory)
7.13 Unit (set physical unit)
With Unit , you can set the physical unit used by SPECTRAN to show results.
Available choices are:
dBm (DecibelMilliWatts), dBµV (DecibelMicroWatts), V/m (VoltMeter) and
mA/m (MilliAmpereMeter).
Hint: In “EXPOSURE LIMIT analysis” mode, SPECTRAN additionally displays
power flux density in W/m² (incl. Autorange). Thus, in this mode, you can show
three units SIMULTANEOUSLY , as in addition, the bargraph shows values in
dBm !
7.0 The main menu
27
A typical result after a 20 minute car drive with activated HOLD
mode. Easily visible: During the whole drive, only transmitters from
T-Mobile (952 & 942MHz) and Vodafone (936MHz) have been
active.