Servicing
the
HP
83447A
P
erformance
T
ests
25.
Increase
the
electrical
channel
vertical
sensitivity
to
20
mV/div
.
A
noisy
straight
line
is
displayed.
26.
A
djust
R26
slowly
clockwise
until
the
display
indicates
an
increase
in
noise
(primarily
positive-going).
27.
A
djust
R26
counter-clockwise
until
the
excess
noise
just
disappears
.
High
input
limit
adjustment
28.
Turn
the
laser
transmitter
on.
29.
Set
the
electrical
channel
vertical
sensitivity
to
150
mV/division.
30.
Disconnect
the
optical
ber
from
the
OPTICAL
INPUT
connector
.
31.
Attach
the
optical
ber
to
the
optical
power
meter
.
32.
Set
the
attenuator
for
+3.5
dBm.
33.
Connect
the
source
to
the
OPTICAL
INPUT
on
the
HP
83447A.
If
no
eye
diagram
is
displayed,
adjust
R1
slowly
clockwise
until
a
good
eye
diagram
is
displayed.
4-22
Summary of Contents for 83447A
Page 1: ...User and Service Guide HP 83447A Lightwave Trigger Receiver ...
Page 3: ...Printing History HP Part Number Edition Date 83447 90002 Edition 1 April 1996 iii ...
Page 10: ......
Page 15: ...1 General Information ...
Page 25: ...Declaration of Conformity 1 11 ...
Page 29: ...2 Installation and Preparation for Use ...
Page 51: ...3 Using the HP 83447A ...
Page 55: ...4 Servicing the HP 83447A ...
Page 95: ...Servicing the HP 83447A Replaceable parts Figure 4 9 HP 83447A replaceable hardware 4 41 ...
Page 97: ...Index ...
Page 102: ...W warranty 2 13 warranty information viii waveform test measuring eye diagram 3 3 Index 6 ...