11 Instrument maintenance
120 NBM-550 Narda
11.4 Checking instrument functions
Note: The function test does not apply to the EHP-50. The
EHP-50 has its own built in self test.
Performing a function test:
1. Connect the probe to the instrument (see “Connecting
the probe” on page 24).
2. Switch the instrument on (see “Switching on” on
page 30) and wait until the self test is complete.
3. Open the Probe Test function (MAIN/INFORMATION/
PROBE TEST).
The measured field strength will be displayed separa-
tely for all 3 input channels
(Probe channel 1...3).
4. Bring an appropriate signal source (see “Appropriate
test sources” on page 122) near the probe head.
WARNING
Probe is not operating properly
Possibly present high radiation values are not
recognized.
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 important 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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