7.9 Reflev
(reference level)
[Up/Down arrow keys]
By setting the so-called
reference level
, you can adjust the position of the dis-
played signals in relation to the upper screen edge (the so-called reference
level). This feature can be uses to eliminate visually distracting background
noise or other small signals from the display so that only the “peaks“ of the stron-
gest signals remain. Other signals will be “cut off“ at the bottom. Available opti-
ons are:
Auto
Unit
m-Unit
µ-Unit
n-Unit
With the
Auto
mode (default), SPECTRAN will
automatically
calculate the opti-
mum reference level AFTER taking the sweep (this might be corrected during
the next sweep), by taking into account the highest measured signal level. A
very convenient feature especially when the signal level is not known.
However, automatic adjustment cannot always provide “optimal“ scaling: By
constantly changing the reference level, the display can always keep “jumping“,
which might be interfere when doing slow sweeps. Another problem is, that
background noise would be displayed as a “full signal“ when there is no other
signal. To alleviate this problem, you can set a
fixed
reference level by using one
of the
Unit
,
m-Unit
,
µ-Unit
or
n-Unit
settings and get a “background-noise less“
display. With these settings, the reference level will be set according to the phy-
sical unit selected in the
UNIT
menu (see also 7.15). For example, if you are
measuring in Tesla, using the
m-Unit
setting will set the reference level to
1mT
.
In theory, only signals stronger than 1µT and below 1mT will be displayed (in
practice, however, due to the low resolution of the LCD, 20µT is a more reali-
stic).
If you would like to display signals smaller than 1µT again, please just change
the reference level accordingly:
Firmware V 1.0 / © 2005-2013 by Aaronia AG, D-54597 Euscheid, www.aaronia.com
26
Reflev
(reference level)
Reflev
(reference level)
1
m
T (m-Unit)
1
µ
T (µ-Unit)
1
n
T (n-Unit)
1T (Unit)
7.0 The main menu
