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6.17
10781A
Pulse
Converter
Troubleshooting
The
10781A
Pulse
Converter
accepts
the
reference
and
measurement
signals
from
the
5501A
Laser
Head
and
10780A
Receiver,
respectively.
The
10781A
compares
the
frequency
of
these
two
signals
and
supplies
difference
outputs
to
user-designed
equipment
in
one
of
two
forms
-
up/down
pulses
or
phase-related
square
waves.
If
the
unit
does
not
output
these
signals
when
reference
and
measurement
signals
are
available
at
the
inputs,
the trouble
lies
within
the
10781A
circuits.
Remember
that
output signals
exist
only
when
the
optical
devices
are
in
motion
and
a
difference
between reference
and
measurement
signal
frequency
exists.
The
front-panel
ERROR
indicator
illuminates
when
the
allowable
rate
of
movement
of the
optical
devices
i s
exceeded
or
when
either
the
reference
or
measurement
signal
is
not
present
at
the
circuit
inputs.
Depending
upon
internal
jumper
selection,
an
error
condition
can
disable
output
pulses.
Errors
can
be
cleared
and
operation
can
be
resumed
by
correcting
the
fault
and
pressing
the
front-panel
RESTART
pushbutton.
For
additional
information
refer
to
the
10781A
unit
manual.
6.18
Power
Supply
Troubleshooting
Two
power
supplies
are
used
with
most
5501A
Laser
Transducer
Systems
-
a
+15-volt
supply
and
a
+5-volt
supply.
Both
supplies
are
current
limiting
and,
consequently,
the
output
voltage
drops
to
near
zero
volts
if
the
outputs
are
shorted.
If
this
condition
exists,
disconnect
the
suspect
supply
and
measure
the
open-circuit
output
voltage.
Use
of
this
method
determines
if
the
supply
itself
is
malfunctioning
or
if
a
short
in
the
cabling
or
elsewhere
is
causing
the
supply
to
current
limit.
If
the power
supply
i s
found
to
be
defective,
refer
to
the
separate oper-
ating
and
service
documentation
supplied
with
the
power
supply.
These
manuals
also
contain
procedures
for
adjustment
of
the
output
voltages.
6.19
DETAILED
TROU
BLESHOOTINC
PROCEDURES
Each
of
these
troubleshooting
procedures
parallels
the
corresponding
installation
and
checkout
procedure
in
Section
V
and
is
subdivided
in
the
same
manner.
Since
the
indications
during
preliminary
procedures
and
installation
and
alignment
of
the
laser
head,
receiver,
and
optics
are
minimal,
they
are
repeated
for
ech
troubleshooting
procedure.
If a malfunction is detected during the installation and checkout of the system (or
if
you are
unable to locate a malfunction in a previously operating system using the general trouble-
shooting information) use one of the following procedures:
a.
HP-IB interface electronics troubleshooting (Table 6-7).
b.
Computer interface electronics troubleshooting:
1. Counter-based systems troubleshooting (Table 6-2).
2.
Comparator-based systems troubleshooting (Table 6-3).
c.
English/Metric pulse output electronics troubleshooting (Table 6-4).
d.
10781A Pulse Converter troubleshooting (Table 6-5).
The most effective method of using these procedures is to note in which procedure (preliminary
installation, interface electronics installation, etc.) a problem occurred. Locate the appropriate
troubleshooting table (Tables 6-7 through 6-5) for your system. Locate the section of the table
that pertains to the procedure being performed at the time the trouble was observed. Trouble-
shoot according to the procedure given.
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Table of Contents
Troubleshooting
