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320 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide
IP Internet protocol. The network layer for the
TCP/IP protocol suite widely used on Ethernet
networks.
L
LAN Local area network
LO Local oscillator
LXI LAN eXtension for Instrumentation. An
instrumentation platform based on industry
standard Ethernet technology designed to
provide modularity, flexibility, and performance
to small- and medium-sized systems. See also
http://www.lxistandard.org
M
Modulation Format Custom modulation, Two
Tone, or Multitone.
Modulation Mode Dual ARB, Custom
modulation, Two Tone, or Multitone.
Modulation Standard Refers to a Cellular
standard format (i.e. NADC, PDC, PHS, etc.).
Modulation Type Refers to the various I/Q
constellation types (i.e. PSK, MSK, FSK, C4FM,
etc.)
N
Non−volatile That which survives a power cycle
(such as files stored in USB media).
Nyquist filter Also referred to as a cosine filter.
These filters have the property that their
impulse response rings at the symbol rate.
Adjacent symbols do not interfere with each
other at the symbol times because the response
equals zero at all symbol times except the center
(desired) one.
P
Persistent That which is unaffected by preset,
user preset, or power cycle.
Point- to- point Time In a step sweep (page 51),
the sum of the dwell time, processing time,
switching time, and settling time.
R
Rectangular filter Also referred to as a ideal
low pass filter. These filters have very steep
cut-off characteristics. The pass band is set to
equal the symbol rate of the signal. Due to a
finite number of coefficients, the filter has a
predefined length and is not truly “ideal”. The
resulting ripple in the cut-off band is effectively
minimized with a Hamming window. This filter
is recommended for achieving optimal ACP. A
symbol length of 32 or greater is recommended
for this filter.
Root Nyquist filter Also referred to as a Root
cosine filter. These filters have the property that
their impulse response rings at the symbol rate.
Adjacent symbols do not interfere with each
other at the symbol times because the response
equals zero at all symbol times except the center
(desired) one. Root nyquist filters heavily filter
the signal without blurring the symbols together
at the symbol times. This is important for
transmitting information without errors caused
by ISI. Note that ISI does exist at all times
except the symbol (decision) times. A cascade of
two of these filters has the transfer function of
a Nyquist filter. One is in the transmitter, the
other in the receiver, so that the system taken
as a whole has the zero-ISI properties of an ISI
filter.
RMS Root mean square. A time-varying signal’s
effective value (the equivalent DC voltage
required to generate the equivalent heat across
a given resistor). For a sinewave, RMS = 0.707 x
peak value.
S
Softkey A button located along the instrument’s
display that performs whatever function is
shown next to it on that display.