PERFORMANCE CHECK PROCEDURE
PURPOSE
This Performance Check Procedure verifies the Perform
ance Requirements of the 2246 1Y or 2246 Mod A as
listed in the Specification (Section 1) and helps deter
mine the need for readjustment. These checks may also
be used as an acceptance test or as a preliminary
troubleshooting aid.
You do not have to remove the wrap-around cabinet from
the 2246 1Y or 2246 Mod A to do this procedure. All
checks can be made with controls and connectors ac
cessible from the outside.
TEST EQUIPMENT REQUIRED
Table 4-1 lists ail the test equipment required to do the
Performance Check Procedure. Test equipment specifi
cations described are the minimum necessary to pro
vide accurate results. For test equipment operating infor
mation, refer to the appropriate test equipment instruc
tion manual.
When you use equipment other than that recommended,
you may have to make some changes to the test setups.
If the exact example equipment in Table 4-1 is not avail
able, use the Minimum Specification column to deter
mine if any other available test equipment might be ade
quate to do the check.
PERFORMANCE CHECK INTERVAL
To ensure instrument accuracy, check the performance
of the 2246 1Y or 2246 Mod A after every 2000 hours of
operation, or once each year if used infrequently. If the
checks indicate a need for readjustment or repair, refer
the instrument to a qualified service person.
REV OCT 1991
Section 4—2246 1Y and 2246 Mod A Service
INTRODUCTION
The silver-oxide batteries used in the 2246 1Y
(instruments serial numbered B714999 and
below)
EVERY 12 MONTHS to ensure proper opera
tion of the instrument.
This procedure is divided into subsections to let you
check individual sections of the instrument when it is not
necessary to do the complete Performance Check. An
Equipment Required block at the beginning of each sub
section lists the equipment from Table 4-1 that is needed
to do the checks in that subsection.
The initial front-panel control settings at the beginning of
each subsection prepare the instrument for the first step
of the subsection. Do each of the steps in a subsection
completely and in order to ensure the correct control set
tings for steps that follow. To ensure performance ac
curacies stated in the Specification (Section 1), let the in
strument warm up for 20 minutes and run the SELF CAL
MEASUREMENTS routine.
To run the SELF CAL MEASUREMENTS routine:
Press the top and bottom menu-item select buttons to
display the SERVICE MENU. Underline and select SELF
CAL MEASUREMENTS. Press RUN to start the routine,
then QUIT to return to the normal oscilloscope mode.
Performance accuracies are ensured only
when the SELF CAL MEASUREMENTS are
done AFTER the 20-minute warmup.
N O T E
MUST BE REPLACED AT LEAST
PREPARATION
N O T E
4-1