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Wavetek 3000 - Page 46

Wavetek 3000
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PERFORMANCE
TESTS
METHOD
TotalLevel
+13
to
-7
dBm
:
±1
.25
dB
(Typ
±0
.75
dB)
Accuracy
-7
to -77
dBm
:
±1
.95
dB
(Typ
±1
.25
dB)
<-77
dBm
±2
.75
dB
(Typ
±1
.5
dB)
Accuracy
Breakdown
Flatness
(+13
to
-7
dBm)
±0
.75
dB
(Typ
±0
.5
dB)
OutputMeter
±0
.5
dB
Step
Attenuator
±0
.5
dB
to
70
dB
(±0
.2
dB
calibration
error)
±1 .0
dB
to
130
dB
(±0
.5
dB
calibration
error)
The
±1
.25
dB
level
accuracy
between
+13
and
-7
dBm
consists
of
the
sum
of
the
outputmetererror
(±O
.5
dB)
and
the
flat-
ness
(±0
.75
dB)
.
Both
errors
are measuredwith
a
power
meter
.
The
output
meter
error
is
measured
at
50
MHz
in
two
10
dB
output
ranges
(+13
to +3
dBm
and
+3
to
-7
dBm)
.
The
flatness
is
measuredrelative
to
50
MHz
in 10
MHz
steps
between
10
and
520
MHz
at
+12,
+3
and
-7
dBm
output
levels
.
The
level
accuracy
below
-7
dBm
depends
upon
the
output
step
attenuator
error
in
addition
to
the
outputmeter
error
and the
flatness
.
The
output
step
attenuator
is
a
combination
of
pi-pad
sec-
tions
of
10, 20,
30,
30
and
40 dB
.
These
fivepi-pads
are
programmed
by
cams
to
provide
0
to
130
dB of
attenuation
in
10
dB
steps
as
shown
in
the
table
below
.
OUTPUT
STEP
ATTENUATORPOSITION ACTIVE
STEP
ATTENUATOR
PADS
(X)
dBm
10
dB 20 dB 30
dB
30
dB
40 dB
+
10
0
- 10
x
- 20
x
-
30
x
-
40
x
x
-
50
x x
-
60
x x
- 70
x
x x
- 80
x x
x
-
90
x x
x
-100
x
x x
-
x x
x
x
-
III
x x
x x
-130
x
I
x
'
x
x
x
i

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