6 Instrument maintenance
48 NBM-520 Narda
6.4 Checking for proper operation
Performing a function test:
1. Connect the probe to the instrument (see “Connecting
the probe” on page 20).
2. Switch the instrument on and immediately thereafter
press and hold down the Units key for 2-3 seconds to
activate the probe function test.
After the self test the measured field strength will be
displayed separately for all 3 input channels
(Ch1...3).
3. Bring an appropriate signal source (see “Appropriate
test sources” on page 50) near the probe head.
4. Switch the signal source on.
The Ch1...3 display increases: Function test OK
Briefly press the ON/OFF button to change to the
measurement mode.
The Ch1...3 display does not increase: Function test
not OK.
Do not use the probe any more. Contact the
responsible service center.
WARNING
Probe is not operating properly
Possibly present high radiation values are not recog-
nized.
Check probes for proper operation with a signal source
before using this measuring instrument. This is espe-
cially important for thermocouples because the sen-
sors can be affected by various mechanical and
environmental stressors.
Narda offers portable sources to accomplish this im-
portant step (see “Accessories” on page 57).
Before beginning any RF radiation measurement, al-
ways advise yourself of the frequencies and field
strengths that you could expect to encounter.
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