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)
1mT (m-Unit)
1µT (µ-Unit)
1nT (n-Unit)
1T (Unit)
7.0 The main menu
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