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Model
5526A
Angular
Measurements
6-16
M
easurements
At
Specific
Physical
Locations
To have
your
laser Measurement
System make
measurements
only at specific
physical
locations-
1.
Push the RESET
key.
{You
can also
RESET from the Remote
Control Unit.
)
2.
Move one of
the
optics
a
predetermined distance.
3.
Press the RECORD button
on
the RemOle
Conlrol Unit connected
to Ihe Measu rement
Display
.
One
measurement
is made each
lime
you
press
this bulton.
M
easurements
At Specified
Time
Intervals
To have
your
laser Measurement
System
make
measurements
at
specific
time intervals (i.e.,
"on-
the-fly")
-
1.
Push the RESET
key
.
(You can
also RESET from Ihe Remote
Conlrol Unit)
2.
Enter the time
interval you want between
measurements
(0.05
to
12 secondsl.
3.
Press the AUTO RECORD key. This
will start
the automatic taking
of
dala. (See
Section
16
for
marc information
about
using Ihis
key.)
4.
Move one optic along
the
full measurement palh. A
measurement is made
automatically every
so
many
seconds until you
press
the AUTO
RECORD
key
again.
5.
Press
the AUTO RECORD
key when
the
end
of
travel
is
reached. This
will
turn
off
the AUTO
RECORD mode, and
end
the recording
of
measurements.
If
an
HP Personal
Computer
or
an
HP-IB Printer
is
not
connected to
the Measurement Display
unit, pressing RECORD
or AUTO
RECORD
will cause
the message
"lr
Error"
10
be
displayed.
WHAT AFFECTS ACCURACn
Angu lar accuracy
is dependent
upon
the
accuracy of
the
initial alignment
between the angulilr
relleCiar and
interferometer in pitch and roll.
Laser System Error
Sources
The
one
potential laser
System error source
for
Angular
measurements is the distance between
the
RetrorefieClors.
If this distance
changes
during
a
measurement, the measurement results wi ll
be
incorrect.
The
only
time
the
distance between the Retroreflectors
will change
is
if
the
temperature
of
the
Angular
Reflector's housing
changes
during a measurement; thus
you should
keep this temperature as
constant
as
you can.
Series
2648A
NOV
86
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