Making A Measurement; System Checks; What Affects Accuracy?; Procedure - HP 5528A User Manual

Model 5528A
Distance Measuremen ts
MAKING A MEASUREMENT
System Checks
1,
Make sure both Laser Head ports are swi tched to their large apertures.
2. The laser Hcad turret must be sct to "OTHER ".
3. The laser Head's " READY" indicator must be lighted steadily (i.e., not blinking),
4. Make su re the laser Mcasurement System is properly imcrfaced with ot her in struments, as
needed to record your data.
a. If you record your data manually, no interfacing is necessary.
b.
If
you want to record your data automatically , but you aren't using the HP Dimensio nal
Metrology Anal ysis System or another HP-IB controller, you must have an HP-IB
compatible printer connected to the Measurement Display unit, vi3 the rear panel HP-IB
(" IEEE STD 488 PORT") co nnector. You must also make sure the Measurement Display is
set-up to output to a printer via HP-IB. See Section 16 and foll ow the instructions for "Data
Transfer withou t an HP-IB Controller".
c. For forrnalted automatic records, you shou ld have the HP Dimensional M etrology Analysis
System or 3n !-tP-1I3 co ntroll er with your ow n programs to make it work with the l aser
Measurement System, The HP Analysis System comes wit h an HP Personal Computer and
programs to make it work with the l aser Measurement System. The operating manual for
the An31 ysis System
will
ex plain how to use it. In either case, you musl firSI make su re the
Measurement Disp lay is sel-up to accept a controller via HP-II3. See Section 18 and follow
the instruct ions for " Data Transfer with an HP- IB Controller".
Procedure
1. Push the RESET key on the Measurement Display or on the Remote Control unit connected to
the Measurement Display. (Remember to do this only when the Optics are as close together as
poss ible
10
prcvent " deadpath error",)
2. Move one of the Optics a predetermined distance.
J. Press the RECORD button on the Remote Control Unit. One measurement is made each time
you press this button.
If
an HP Personal Computer or an HP-IB Print er is not conneded to the Measurement Display unit,
pressing RECORD will cau se the message " lr Error" to be displayed,
WHAT AffECTS ACCURACY?
The laser Measurement System's Distance measuring accuracy dep ends on the System's ability to
adjust for environmental chanSE5 and on your ability to sel up and operate the system properly. [n
the next few pages we
will
describe some potential measurement errors, exam ine how they affect
Distan ce measurements, and what ciln be done about them to ma xi mize measurement accuracy.
The laser Measuremcm System has an inherent accu racy limit of
0.'
part-per-million. All of the
following measurement errors add to this valu e.
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