NARDA NBM-550, Operating Manual

Page: 47 / 156

4.3 Making basic settings
Narda NBM-550
37
Setting the backlight
The display backlight is activated every time you press a key
and switches off after a specified time to preserve battery
power.
The following settings are possible:
•
off
: Backlight disabled
•
5/10/30/60 s
: Backlight switches off after 5/10/30/60
seconds
•
permanent
: Backlight is switched on permanently
The default setting is
10 seconds
.
Changing the switch off delay time
1. Open the
LCD Backlight
function (MAIN/
MEASUREMENT SETTINGS/Next/...).
2. Use the arrow keys
▲
/
▼
to select the desired setting and
then press the
OK
key to confirm the setting.
Setting the contrast
✓
The display shows the measurement screen.

Press the arrow keys
▲
or
▼
to increase or decrease the
contrast.
Changing the display units
Power density or field strength units can be selected when
using normal (flat) probes. The units can simply be
converted, while the measurement will stay the same.
Results from shaped probes are always displayed in %. A
shaped probe provides a frequency sensitivity that mirrors a
particular standard, such as ICNIRP.
Values in % (of standard) are related to the equivalent
power density limit, not to the field strength. A shaped probe
can also display results as a field strength or power density
value for a selected frequency of this particular standard
(see
“Measuring with a test standard”
on page 58). This
is why the display unit can be selected for shaped probes as
well.