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SECTION
1
TECHNICAL
SPECIFICATION
Model
2151
Technical
Specifications
INPUTS
Input
A:
Range
10Hz
to
100MHz
Sensitivity
20mV
rms 10Hz
to
80MHz
30mV 80MHz
to
100MHz
Input
Impedance
1M
ohm/35p
F
Maximum
Input
260V (DC
+ AC
rms)
to
2ltHz
p
decreasing
to
10V rms
at
50kHz
and
above
Input Attenuation
xl and
x20, selectable
Filter
50kHz
low pass
filter
selectable
Input
B:
Range
40MHz
to 1.3
GHz
Sensitivity
lOmV
(to
1GHz)
75mV
(at
1.3GHz)
Input
Impedance
50
ohm
nominal
Operating
Range
lOmV
to
5V
rms
Damage
Overload
7V
rms
(protected
by
fuse)
VSWR
2.0
:
1 typical
(to
1GHz)
AM
Tolerance
^90%
(for
trough
> minimum
pk-pk
sensitivity)
Input
C:
Range
500MHz
to
20GHz
Sensitivity
-32dBm
(to
12.4GHz)
-27dBm
(to
20GHz)
Maximum
Operating Level
+7dBm
Damage
Level
25dBmpeak
+
33dBm
with Option 11 high
power
limiter
Input Connector
PC
3.5
female
Input
VSWR
<2:1
to
10
GHz
<3
:
1
to
20GHz
AM
Tolerance
> 90%
(for
trough
> minimum
pk-pk
sensitivity)
2151
OPS
A1571/DA
ALGl/Iss.01/03.94
FM
Tolerance
Mode
Modulation Rate
FM
Tolerance
Max.
Deviation
Automatic
Normal
Low
FM
Track
1kHz
-
10MHz
45Hz
-
10MHz
300kHz
-
10MHz
20MHzpk-pk
20MHz
pk-pk
20MHz
pk-pk
Manual
1kHz
-
10MHz
60MHz
pk-pk
Aquisition
Time
Mode
Aquisition
Time
Automatic
Normal
<125mSec
Low
FM
<
1.255mSec
Track
<60mSec
Manual
<20raSec
Tracking Speed
Mode
Tracking Speed
Normal
IMHz/Sec
Low
FM
80kHz/Sec
Track
1
GHz/Sec
Amplitude
Discrimination
(typical)
6dB
for
signals
within
500MHz
20dB
for
signals
at
any
frequency
Spillback
^-50dBm
(-70dBm
if
Input
A
or
B
selected,
or sleep
mode)
Input
C
Modes
of
Operation:
Normal
Counter
acquires
and measures
frequency
of
the highest
level
signal
within
the
sensitivity
range
(subject
to
amplitude
discrimination
specifications).
Optimum
internal
local oscillator
frequency
and harmonic
number
are
determined
automatically.
1-1
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