1.
In
the MEASUREMENT SETUP Label Field -
that
the MEASUREMENT SETUP was
changed
while a measurement was
in
progress.
2.
In
the Number
of
Averages Field -
that
the selected
overlap
has not been
achieved.
3.
In
the Data Source Field, with
that
field set to Equalized -
that
the
current
mea-
sured
data
being equalized was measured with a
different
MEASUREMENT SETUP
to
the STORED SETUP, that is the Setup
S.
9.12. USE
OF
TRANSIENT AND EXPONENTIAL WINDOWS
When Transient or Exponential
windows
are used,
direct
visual
feedback
regarding
their
shape and
position
can be obtained
by
switching
to
display
of
Time Ch. A
or
B
real part,
or
Enhanced Time Ch. A
or
B real part, as
appropriate.
This will allow a real-
time
display
of
the resulting
windows
as the Weighting
Shift
and Length fields
are
adjusted. Note that in
Spectrum
Averaging
it
is also necessary
to
select RECORD
"Cont."
for
this display.
Special
Parameter 30, (see Section 12.5.
1'2),
can be used in
Spectrum
Averaging
to
free the windows, such
that
a
real-time
display
of
their
shape and
position
is always
obtained,
irrespective
of
the
settings
of
the RECORD controls.
9.13. TRIGGERING THE 2032
9.13.1. Use of Internal Trigger
When the 2032 is
triggered
internally, the user has the
choice
of
either
triggering
off
the
input
signal directly, or, (in baseband
mode
only),
off
the
filtered
input
signal,
that
is the signal
after
it
has been
bandlimited
to the selected baseband
frequency
span.
When
operating
in a
low
baseband
frequency
span, the
former
might
be preferable,
since
variations
in the
filtered
input
signal
might
be slow and hence
present
a badly
defined
trigger
point, while the
raw
input signal
might
present a much
better
defined
trigger
point.
Triggering
off
the
filtered
input
may
become
preferable, however, when
the raw
input
signal
con~ains
many
short
transients and
out-of-band
noise. These will
often be removed by the
bandlimiting
process, so removing the
possibility
of
false
triggers.
9.13.2. Use of External Trigger
116
When the 2032 is externally
triggered,
the external
trigger
level, which is
factory
preset
to
1
V,
can be varied
from
< 0,5 V
to
5
V.
The
procedure
is as follows:
A WARNING! Disconnect all
power
from
the 2032
before
attempting
to
remove
or
replace
its
protective
panels. Internal adjustments with mains
power
connected should only be
carried
out
by skilled
persons
who
are
aware
of
the hazards
of
dealing with live
circuit-
ry.
1.
Disconnect all
power
supplies
before
removing
any
of
the
protective
panels
of
the
2032. Remove the Analog Input
Control
Card
ZD 270
from
the 2032. Its
location
is
shown in Fig.9.3.
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