5-1
The 2430 Oscilloscope requires adequate warm-up time
in a 20°C to 30°C environment before performing the cali-
bration routines and adjustments in this procedure. Cali-
bration performed before the operating temperature has
stabilized may cause an erroneous calibration. The adjust-
ment procedure indicates the duration of the warm-up
periods and the points in the procedure they should be
allowed.
WARM-UP TIME REQUIREMENTS
While a Self Calibration must be performed before
doing the External Adjustments, it can also be performed
any time the instrument is installed in its cabinet, optimiz-
ing the instrument's performance for the existing environ-
ment. The internal jumper removed for performance of the
Internal Adjustments and External Calibration does not
affect Self Calibration.
To completely calibrate this instrument, all steps of this
procedure should be performed, completely and in
sequence. Individual steps in either the Internal Adjust-
ments or External Calibration subsections can be omitted
if a complete calibration is not needed. Individual substeps
(parts) in "Display Adjustments" (Internal Adjustments
subsection) can be skipped by advancing to the next
display.
CALIBRATION SEQUENCE
AND PARTIAL PROCEDURES
Display Adjustments in "Internal Adjustments" subsec-
tion). The instrument cabinet must be installed and the
instrument operating at an ambient temperature between
+20°C and +30°C for valid calibration of the Attenuators
and Trigger circuits.
Subsection three is "External Calibration." Here, the
user inputs test signals for the Attenuator and Trigger cali-
bration and initiates the semiautomatic routines that use
those signals. The internal jumper disabling the Extended
Calibration (EXT CAL) menu must be removed to enable
the EXT CAL menu choices (as was necessary for the
The second subsection is "Self Calibration." SELF CAL
is a fully automatic procedure initiated by the user from
the front panel. No external signals or internal adjustments
are required, and beyond starting the procedure, no further
action is needed for the user to do a SELF CAL. The
instrument cabinet must be installed to obtain a proper
SELF CAL, and the Self Calibration subsection must be
done and passed before going on to the third subsection
of the Adjustment Procedure.
The Adjustment Procedure consists of three subsec-
tions. The first subsection is "Internal Adjustments." Step
1 of this subsection, "Display Adjustments," uses display
test patterns generated internally by the instrument. Steps
2 through 5 require external generators to provide signals
for the test displays. In all steps of "Internal Adjustments"
internal controls must be adjusted (cabinet removal is
required). An internal jumper must also be pulled off to
enable the menu choices for the Extended Calibration
menu. This menu must be enabled to perform "Display
Adjustments" as well as the Attenuators and Triggers
adjustments called out in the "External Calibration" sub-
section of this procedure.
This procedure is used to return the instrument to con-
formance with its "Performance Requirements" as listed in
the "Specification" (Section 1). It can also be used to
optimize the performance of the instrument. As a general
rule, these adjustments should be performed every 2000
hours of operation or once a year if used infrequently.
IMPORTANT-PLEASE READ BEFORE USING THIS PROCEDURE
INTRODUCTION
ADJUSTMENT PROCEDURE
Section 5-2430 Service
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