NARDA NBM-550, Operating Manual

Page: 67 / 156

5.7 Activating the alarm function
Narda NBM-550
57
5.7 Activating the alarm function
The alarm function allows you to enter a limit value. The
instrument outputs an audible signal and the Status LED
flashes red when this limit value is exceeded.
This function is useful for checking limit values or for
signaling an early warning of dangerous field strengths, for
example.
The possible alarm limits are:
• Normal probes
Table 3 Setting ranges of the limit values (in 1 dB steps)
• Shaped probes: 0.1% – 10,000% (in 1 dB steps)
Defining the alarm limits
1. Open the
Alarm Limit
function
(MAIN/MEASUREMENT SETTINGS/...).
2. Use the arrow keys
▲
/
▼
to change the value and press
the
OK
key to confirm the setting.
Activating the alarm function
1. Open the
Alarm Function
function
(MAIN/MEASUREMENT SETTINGS/...).
2. Use the arrow keys
▲
/
▼
to select
On
and press the
OK
key to confirm the setting.

The symbol is shown in the display when the
alarm function is activated (see
“Measurement
screen overview”
on page 32).
Measuring range Minimum Maximum
V/m 100 mV/m 100 kV/m
A/m 250
μ
A/m 250 A/m
W/m
2
25
μ
W/m
2
25 MW//m
2
mW/cm
2
2.5 nW/cm
2
2.5 kW/cm
2