5 Measuring with the NBM-550 and HF probes
58 NBM-550 Narda
5.8 Audible Indicator (hot spot search)
You can use the Audible Indicator function to indicate
changes in field strength and determine hot spots (areas of
maximum field strength). The audible signal changes
according to the way the field changes:
• Continuous tone: Field strength is increasing
• Interrupted tone: Field strength is decreasing
• No tone: Field strength is constant
Activating the function
1. Open the Audible Indicator function
(MAIN/MEASUREMENT SETTINGS/Next/...).
2. Use the arrow keys ▲/▼ to select On and press the OK
key to confirm the setting.
5.9 Measuring with a test standard
The NBM-550 allows measurement based on test
standards in the NORMAL display mode. Since the
measurement result refers to a single, defined frequency (in
contrast with the usual broadband measurements),
measuring with a test standard only makes sense if the field
you want to measure is dominated by a known frequency.
You can apply a test standard as follows:
• Use a shaped probe. The standard is set by the probe
and cannot be changed.
• Use a flat probe and apply one of the standards stored in
the instrument.
• Use the NBM-TS PC software to customize your own
standard.
Three steps are needed to make a measurement using a
test standard:
• Step 1: Select a test standard
• Step 2: Select the reference frequency
• Step 3: Apply the test standard
These steps are described below.
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