HP 5528A User Manual

Making A Meas ur ement
Sys tem Ch ec lf: s
Mode l 552 6A
Parallelism Mea s urements
Use the Ins tru ctions for "SYS TEM CHECK" given In Sec tion 10 or Section 11 of thi s User's Guide .
Pr ocedure
If you use the riP Dimensional Metrolog y Analysis Sys tem, refer to its Operating Manual to
record and store th e data for this seco nd axi s.
If you don't use the HP Dimensional Me t rol ogy Anal ys is Sys tem, fol low the instruc tion s given in
Section
10 or Section 11 of this User's Guide, then refer to Section 21 and calc ulatc the s lope of
this second- axi s measurement.
Calculating lin ear Paralle li sm
On ce you ha ve the slope for each mea su rement ax is ( from Section 21 ), translate the slope values
into a Para ll elism value. What yo u must do is -
1. F or ea ch axis, determine the angle of misalignment (6).
This is done by taking the ar ctangent of the s lope (m) of each Straightn ess mcas uremenl and
multiplying by " 3600 ", to convert to " arcseconds ".
/1 ::= (arctangent (m)1 x 3600 ( arcse co nd s)
Be s ure yo ur slope value is dimensio nle ss, i.e., metre / me tre or in ch/ in ch.
2. Add the angl es together.
linear Parallelism = 8, + 82
In order to do thi s, both the first- and second-axis measurements mu st have def lections of the
Interferometer produ ce the same sign co nvention when in the sa me di rec tion .
Figure
14 ·1 shows that the "z" and "w" axes arc not parallel by the amount 0, + 0 2.
Figure 14-1 s how s that the "z" and "w" axes are parallel if the magnitude of 0, equals the
magnilUde of 02. When yo u add 6, + 8 2, you are actually adding 8, + (- 02 ) = 01 + (- 0, ) = 0.

HP 5528A Specifications

General

Brand	HP
Model	5528A
Category	Measuring Instruments
Language	English