HP 83480A User Manual

The Digital Communications
Analysis Menus
Mask Test Menu
Standard masks The factory-installed industry-standard masks include the following:
Optical Masks Electrical Masks
STM0/OC1 STS1 Eye
STM1/OC3 STS1 Pulse
OC12 STS3 Eye
OC24 STS3 Pulse 0
STM16/OC48 STS3 Pulse 1
FC133 DS1
FC266 DS1C
FC531 DS2
FC1063 DS3
FDDI
PDH
2.048
Mb
100BASE-FX
PDH
8.448
Mb
GIGABIT
ETHERNET PDH
34.4 Mb
PDH
139
Mb
0
PDH 139
Mb
1
Any
of
these
masks
may be
recalled
from
memory
and
used
to
test
a
waveform
to
a
specic
industry standard
listed
above
.
Fixed-voltage
masks
Industry
standards
for
PDH
data
rates
at
2.048
Mb/s
,
8.448
Mb/s
,
34.368
Mb/s
,
and
139.000
Mb/s
require
xed-voltage
masks
.
This
means
the
test
signal
1
and
0
voltages must
fall within
certain
absolute
limits
and
the
mask
is
not
permitted to
scale vertically
to t
the waveform.
In rmware
A.02.00 and
above,
the HP
83480A
automatically
performs
xed-voltage mask tests on these rates.
There are two considerations in mask testing at these rates: the mask is
specied for a 75 ohm test impedance, and the required signal swings exceed
the HP 83480A's specied input voltage range.To convert the HP 83480A's
input impedance to 75 ohms, use a minimum loss pad such as the HP 11852B.
T
o
reduce
the
signal
level
to within
the
input
range
of
the
HP
83480A,
add
an
appropriate
50
ohm
xed
attenuator
between
the minimum
loss
pad
and
the
channel input. The HP 11852B has an insertion loss of 5.7 dB
, and suggested
additional attenuation
values are listed in the table below
.
6-4

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English