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H
52382'900A
Vol.
I
Markers
Markers measure
the
frequencies of points on
the
display
in
FULL
SPAN, /DIV
and
METER horizontal
modes*
A
B
select
!
Key
toggles
to
place
the
markers
on either the A
or
B
trace*
1
2
MOVE!
&
!^rT|
a dedicated rotary control permits
a
marker
to be
positioned anywhere on
the
selected A
or
B
trace*
The screen annotation
displays the frequency
of
the
marker
to the
resolution and accuracy
of the
reference frequency
above*
If
both
Marker
1
and
Marker
2
are displayed, additional screen annota-
tion shows
the
value of frequency difference
be-
tween them
to the
same accuracy
as in
the
Frequency Span /DIV
mode*
I
FREQ COUNT
The
frequency
of
any spectral line viewed on the
screen may
be
measured by moving
the
marker
to
the
signal
of
interest*
The resolution
of the
screen readout
is
tlO kHz on
spans greater than
200 kHz/divlslon,
il Hz
on spans of less than 200
Hz/dlvlsion
and ilOO
Hz for
all other spans*
Accuracy
as for
Frequency Standard*
Restrictions
are chat the
selected filter must
have
a
3
dB
bandwidth
greater
than 0*2% span;
that only one
signal
is
present
in
this
bandwidth and that the
marker must
be at
least
20 dB out of the
noise
up
the filter skirt*
[RESIH^
(2nd FUNCT
FREQ COUNT)
(peak find
next'
peakI
(2nd FUNCT
PEAK
FIND)
As for
FREQ COUNT except resolution
is
1
Hz
for all spans*
Marker
1
positions itself
on the
peak
of
the
largest signal on
the
display
and
annotation
gives this frequency
to
/DIV accuracy.
This
value may
be
transferred
to the
reference
fre-
quency
or Che
incremental frequency
by use
of the
MKRl SETS keys.
A
similar function
to
PEAK FIND except
that
the
marker moves
to
successively lower amplitude
peaks up
to a
maximum
of
9
peaks*
MKRl SETS REF FREQ
Operation
of this
key
sets the
reference
fre-
quency
to that of the
Marker
1
frequency.
MKRl SETS INC FREQ]
Operatl
on of
this key sets the
incremental
frequency
step
to
be
that
of
the
Marker
1
frequency*
AF SETS INC
FRE^
Operation
of
this key sets the
incremental
frequency
step
to be that of the
difference
between Marker
I
and
Marker
2
frequencies.
July
85
Chap*
1
Page
11
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