Service manual

5
Time domain
Use your spectrum analyzer as a
low-frequency os cil lo scope or view
signals in the time and frequency
domains simultaneously.
(Note: anti-alias filters can be
switched off.) Special markers for
time-domain data facilitate extraction
of key control system performance
parameters: overshoot, rise time, set-
ting time, and delay time.
Data table
Use a tabular format to keep track
of key frequencies in the spectra of
rotating machinery. The amplitude
and frequency of the signal and a
16-character entry label field are
listed for each selected point.
Automatic units conversion
Display vibration data in the units
of your choice. Select g, m/sec
2
,
in/sec
2
, m/s, in/s, m, mil, inch, Kg, lb,
N, dyn, or pascals as ap pro pri ate for
your application. The in stru ment au to-
mat i cal ly converts fre quen cy-domain
data from specified input trans duc er
units to the units you select for
display. For example, ac cel er om e ter
data is automatically con vert ed and
displayed as mils when mils are
selected. Of course, dB, dBV, dBm
and volts are available for electrical
applications.
Markers
Markers streamline analysis by
helping you select and display spe-
cific data. Marker functions include
marker to peak, next right peak, and
coupled markers for selecting points
in multiple data displays. Markers
readouts are absolute or relative to
your selected reference.
Special markers
Three special marker functions
facilitate analysis of your spectral
data. Sideband markers aid analysis
of modulation signals. Use this func-
tion to quickly locate side bands in
the complicated spectra of rotating
machines. A band-power marker
reads the total power in a selected
band of frequencies and a total
harmonic dis tor tion marker lets you
calculate total harmonic distortion
without including the effects of noise.
Measurement results
at key fre quen cies
can be labeled and
listed using data
table.
Harmonic markers
are used to calculate
the THD of a signal
without including the
effects of noise.
Simultaneous display
of fre quen cy and
time domain data
facilitates analysis of
gear mesh vibration.