Service manual

8
Using Measurement Results Computed Order
Tracking (Option 1D0)
The slice marker
feature is used to
select and display
an order or suborder
from an order map.
Taking the measurement is only half
the job. Raw measurement data must
be stored, recalled, printed, plotted,
integrated with other data for analysis,
and reported. The 35670A helps you
finish the job.
Documented results
The 35670A supports GPIB, serial
and parallel printers and plotters for
direct hardcopy output. The printers
and plotters that can be connected
directly to the 35670A are limited
to older HP-GL printers with PCL 5
capability (HP LaserJet 4000 series is
one such printer).
The internal 3.5 inch flexible disk
drive stores data (Standard Data
Format – SDF or ASCII), instrument
states, HP-GL plots and Agilent In stru-
ment BASIC programs in HP-LIF or
MS-DOS formats for future recall or
use on a personal computer.
Self-contained—no ratio synthe-
sizer or tracking filter required
Order maps
Order tracking
RPM or timetrigger
Display RPM profile
Track up to five orders/channel
Up to 200 orders
Composite power
RPM measurements
Order tracking facilitates evaluation
of spectra from rotating machines by
displaying vibration data as a function
of orders (or harmonics) rather than
frequency. All measurement spectra
is normalized to the shaft RPM.
Now you can have order tracking
without compromising portability.
Traditional analog order tracking tech-
niques require external tracking filters
and ratio synthesizers. With Agilent’s
computed order tracking al go rithm,
external hardware is gone.
Because order tracking is im ple-
ment ed in the software, data is
more precise and your job is easier.
Com pared to traditional analog order
tracking techniques, computed order
tracking offers:
Improved dynamic range at high
orders
More accurate tracking of rapidly
changing shaft speeds
Accurate RPM labeled spectra with
exact RPM trigger arm
Wide 64:1 ratio of start to stop RPMs
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Entire display screens can be im port ed
directly into your word processing
program by plotting HP-GL files to
your named DOS file. HP-GL files
are interpreted and dis played directly
by Microsoft’s Word for Windows.
For general digital signal process-
ing and filtering, data files may be
stored as ASCII, and then imported
to MATLAB
®
or a Microsoft
®
Excel
spreadsheet via the floppy drive,
DataLink, or GPIB.
For specific applications, use
application software that reads SDF
files directly, such as STARModal
and STARAcoustics from Spectral
Dynamics and MEScope from Vibrant.