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Operator Maintenance
Introduction
8
8-3
8-1.
Introduction
This section explains how to perform the routine maintenance and calibration tasks
required to keep a normally operating 5790A AC Measurement Standard in service.
These tasks include:
•
Replacing the fuse
•
Cleaning the air filter
•
Cleaning the external surfaces
•
Calibration
Refer to the 5790A Service Manual for intensive maintenance tasks such as
troubleshooting or repair, and all procedures that require opening the cover of the
instrument such as moving the active binding post position between the front and rear.
The service manual also contains complete verification procedures for checking that
traceability to national standards is being maintained by the normal calibration procedure.
8-2.
Accessing the Fuse
Caution
To prevent instrument damage, verify that the correct fuse is
installed in accordance with the line voltage setting.
The fuse is accessible on the rear panel. The fuse rating label to the right of the fuse
holder shows the correct replacement fuse ratings for each operating voltage. To access
the fuse, refer to Figure 8-1 and proceed as follows:
1.
Disconnect line power.
2.
Insert the blade of a standard screwdriver in the slot of the fuse holder.
3.
Turn the screwdriver counterclockwise until the cap and fuse pop free.
IEEE-488
CALIBRATION MODE
CALIBRATION STORE
WARNING
GROUNDING CONNECTOR
IN POWER CORD MUST BE
CONNECTED TO ENSURE PROTECTION
FROM ELECTRIC SHOCK.
SERVICE
ENABLE
PERIODIC
NORMAL
VOLTAGE
SELECTION
VOLTAGE
SELECTION
FUSE-F1
FUSE-F1
100V
110V
115V
120V
200V
220V
230V
240V
S2 S3 S4
S2 S3 S4
T 1.5A
250V
(SB)
T .75A
250V
(SB)
RS 232C
CHASSIS
GROUND
S2
S3
S4
FUSE -F1
CAUTION:
FOR FIRE P ROTECTION REPLACE
ONLY WITH A 250V FUSE OF INDICATED RATING.
JOHN FLUKE MFG.CO., INC
MADE IN U.S.A
VARIOUS ASPECTS OF THIS INSTRUMENT ARE PROTECTED BY
ONE OR MORE OF THE FOLLOWING U.S. PATENTS.
4803457, 4860289, 4901052, 4716398, 4847507
NO INTERNAL USER SERVICEABLE
PARTS. REFER SERVICE TO QUALIFIED
SERVICE PERSONNEL
TO CLEAN FILTER, REMOVE
FROM INSTRUMENT AND FLUSH
WITH WARM SOAPY WATER
add58f.eps
Figure 8-1. Accessing the Fuse
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