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measurement bandwidth
The resolution bandwidth required for a specific
EM1
measurement. For
MIL-STD measurements, the resolution bandwidth is often determined by
the tester with the approval of the contracting agency.
For commercial testing the measurement bandwidths required usually
follow the recommendations of CISPR:
Band A (10
kHz
to 150
kHz):
200 Hz
Band B (150
kHz
to 30 MHz): 9
kHz
Band C and D (30 MHz to 1
GHz):
120
kHz
measurement range
The ratio, expressed in
dB,
of the maximum signal level that can be
measured (usually the maximum safe input level) to the lowest achievable
average noise level. This ratio is almost always much greater than can be
realized in a single measurement. Refer also to dynamic range.
measurement units
Trace information is stored in trace arrays made up of measurement
units. The measurement-unit range is restricted to integers between
-32,768 and + 32,767. In a logarithmic scale, a measurement unit is
one-hundredth of a
dBm,
or represented mathematically as: (value in
dBm)
x 100 = measurement units. As an example,
-
10.115
dBm
x
100 = -1012 measurement units, not -1011.5. Measurement units for
linear-trace information are from zero, for the bottom of the display, to
10,000 for the top of the display, or the reference level.
memory
A storage medium, device, or recording medium into which data can be
stored and held until some later time, and from which the entire original
data may be retrieved.
memory card
A small, credit-card-shaped memory device that can store data or
programs. The programs are sometimes called personalities and give
additional capabilities to your instrument. Typically, there is only one
personality per memory card. Refer also to personality.
Glossary-16