434
SECTION 5
CALIBRATION
Change info rm a tion, i f any, affecting this section w ill be fou n d at the rear o f this manual.
Introduction
To assure instrum ent accuracy, check the calibration of
the 434 every 1000 hours o f operation, or every six m onths
if used infrequently. Before complete calibration, th o r
oughly clean and inspect this instrum ent as outlined in the
Maintenance section.
Tektronix Field Service
Tektro nix, Inc. provides complete instrum ent repair and
recalibration at local Field Service Centers and the Factory
Service Center. Contact your local T ektronix Field Office
or representative fo r fu rth er inform ation.
Using This Procedure
To aid in locating a step in the Calibration procedure, an
index is given prior to the com plete procedure. Com pletion
of each step in the fu ll Calibration procedure insures that
this instrum ent meets the electrical specifications given in
Section 1. Where possible, instrum ent performance is
checked before an adjustm ent is made. For best overall
instrum ent performance when performing a com plete cali
bration procedure, make each adjustm ent to the exact
setting even if the CHEC K— is w ithin the allowable tole r
ance.
A partial calibration is often desirable after replacing
components, or to touch up the adjustment of a portion of
the instrum ent between major recalibration. To adjust only
part of the instrum ent, set the controls as given under
Preliminary Control Settings and start w ith the nearest
Equipm ent Required List preceding the desired portion. To
prevent unnecessary recalibration of other parts of the
instrum ent, readjust only if the tolerance given in the
CHECK— part of the step is not met. If re-adjustment is
necessary, also check the calibration o f any steps listed in
the IN T E R A C TIO N — part of the step.
IM PO R T A N T N O TE
AH waveforms shown in this procedure were taken
w ith a Tektronix Oscilloscope Camera System, unless
otherwise noted. Lim its, tolerances, and waveforms in
this procedure are given as calibration guides and
should n o t be interpreted as instrum ent specifications
except as specified in Section 1.
TEST EQUIPMENT REQUIRED
General
The follow ing test equipm ent and accessories, or their
equivalent, are required fo r complete calibration of the
434. Specifications given fo r the test equipm ent are the
m inim um necessary for accurate calibration. Therefore, the
specifications of any test equipm ent used must meet or
exceed the listed specifications. A ll test equipm ent is
assumed to be correctly calibrated and operating w ith in the
listed specifications. Detailed operating instructions fo r the
test equipm ent are no t given in this procedure. Refer to the
instruction manual for the test equipm ent if more inform a
tion is needed.
Special Calibration Fixtures
Special Tektronix calibration fixtures are used in this
procedure only where they facilitate instrum ent calibration.
These special calibration fixtures are available from
T e ktro n ix, Inc. Order by part number through your local
T ektron ix Field O ffice or representative.
Calibration Equipment Alternatives
A ll of the listed test equipm ent is required to com pletely
calibrate this instrum ent. The Calibration procedure is
based on the first item o f equipm ent given as an example of
applicable equipm ent. When other equipm ent is substi
tuted, control settings or calibration setup may need to be
altered slightly to meet the requirements of the substitute
equipm ent. If the exact item of test equipm ent given as an
example in the Test Equipm ent list is not available, firs t
check the Specifications column carefully to see if any
other equipm ent is available which m ight suffice. Then
check the Usage column to see w hat this item o f the test
equipm ent is used for. If used for a check or adjustment
which is of little or no importance to your measurement
requirements, the item and corresponding step(s) can be
deleted.
The follow ing procedure is w ritten to com pletely check
and adjust the 434 to the Performance Requirements given
in Section 1. If the applications for which you w ill use the
434 do not require the full available performance from the
434, this procedure and the required equipm ent list can be
sh ortened accordingly. For example, only the basic
measurement capabilities of this instrum ent can be verified
by checking vertical deflection accuracy w ith a Standard
A m plitude Calibrator, vertical square-wave response w ith
fast-rise Square-Wave Generator (such as the Tektro nix
Type 106), and the horizontal tim ing using a Tim e-Mark
Generator.
5-1
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