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Low
FM
For low modulation
rates,
Low
FM
Mode
selects
an
extended
acquisition
time
Track
For
faster
measurement
and
data
output
rates,
Track
Mode
selects
the
fastest
possible acquisition
cycle
and
tracks the
movement
of
fast
moving
input
frequencies
Manual
For
fastest
measurement and
data
output
rates,
Manual Mode
suspends automatic operation and
microprocessor calculates
optimum
internal
local oscillator
frequency
and harmonic
number
from
a
user-entered centre
frequency
NB
user enters
centre frequency
to
within
+
20MHz
of
input
frequency
(
±3MHz
below
1GHz)
and
for full
FM
tolerance
frequency
mustbe
entered with
±1
MHz
IF
OUTPUT
Available
when
measurements
are
made
using Input
C
in
Manual
Mode.
Available intermittently
during
gate time
in
Auto
Mode
(due
to
acquisition
cycle).
Frequency Range
Automatic
Mode
and Manual
Mode
41MHz
to
112MHz
Output
Level
-lOdBm nominal
Output Impedance
50
ohms
nominal
Reverse
Damage
Level
50V (DC
+ AC
rms)
to
210
KHz,
decreasing
to
3V
rms
at
3.5
MHz
and
above.
MEASUREMENT
MODES
Frequency
A
and
B:
Range
Frequency
A
10Hz
to
100MHz
Range
Frequency
B
40MHz
to 1.3
GHz
Digits
Displayed
(Resolution)
3
tolO
digits
LSD
Displayed
(Hz)
F
x
10
°
(F
=
frequency
rounded up
to
next decade,
D
=
no. of
digits)
Frequency
C:
Range
500MHz
to
20GHz
LSD
Displayed
(Resolution)
0.1Hz
to
1MHz
(selectable)
Ratio B/A:
Available
as
both software
and hardware
ratio
Range
40MHz
to
1.3
GHz
10Hz
to
100MHz
LSD
Software
(Ratio
x
F
0
xlO"
$D=B)
)
D=No.
of
digits,
F
0
=
Input
B
frequency
rounded
to
next decade
LSD Hardware
6-9
digits
640
x Ratio
Fa
x
Gate
Time
3-5
digits
As
above
or
Ratio
x
10
(4
'
D|
whichever
is
the greater
(D
=
No.
of
digits)
Resolution
+
LSD
+
1.4
x
A
Trig Error
x Ratio
L
Gate
Time
_l
Trigger Error
=
[E.
2
+
E
2]m
.
I
...
IL—
Slew
rate
at
Trigger Point
Ej
=
Input
noise
in
100MHz
BW
E
n =
Input
amplifier noise
Accuracy
+
Resolution
Ratio C/A, C/B:
Available
as
software
ratio
only
Range C/A
500MHz
to
20GHz
lOHzto
100MHz
Range C/B
500MHz
to
20GHz
Resolution
(Ratio
xF
c
x
10'
tD+B)
)
D
=
No.
of
digits selected
F
c
=
Frequency
into
input
C
rounded
to
next decade
0.1Hz
to
1MHz
(selectable)
Accuracy
(C/A)
±
(accuracy
of
F
c
)
±
accuracy
ofF
4
^
F
a
Accuracy(C/B)
±
(accuracy
of
F
c
)
±
accuracy
of
F
R
F~
F„
1-2
2151
OPS
A1571/DA
ALOl/Iss.0 1/03.94
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