3 Preparing the NBM-550 for use
24 NBM-550 Narda
Displaying the charge state and power
source
The charge state of the battery is shown upper left in the
display during the measurement. The same symbols are
used as in the charge state display for the NBM-550 (see
“Charge state and power source indicator” on page 22).
Correct handling of rechargeable batteries
Avoid completely (deep) discharging the batteries as
otherwise the polarity of a cell may reverse and make the
battery useless.
3.5 Connecting the probe
There are many different probes available for different
applications for the NBM-550. You can find more information
about the order numbers and specifications of the probes
under “Ordering information” on page 133, as well as in
WARNING
Probe is not operating properly
High radiation values that may be present cannot be
recognized when a probe is defective.
Check probes for proper operation with a signal source
before using this measuring instrument. This is
especially important for thermocouples because the
sensors can be affected by various mechanical and
environmental stressors.
Narda offers portable sources to accomplish this im-
portant step (see “Accessories” on page 135).
Before beginning any RF radiation measurement,
always advise yourself of the frequencies and field
strengths that you could expect to encounter.
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