Gossen Metrawatt GmbH
97
20
Maintenance
This section includes information concerning the various mainte-
nance procedures required for the test instrument.
Depending on the type of action required, you’ll need to complete
it on a regular basis, for example safety inspection and recalibra-
tion, or arrange for its performance when necessary, for example
fuse replacement.
20.1
Technical Safety Inspections
Conduct technical safety inspections on your test instrument at
regular intervals. We recommend the same interval for inspections
as is also used for recalibration (see section 20.6 “Calibration”).
The test instrument is designed as a totally insulated device in
accordance with IEC 61010 and IEC 61557-16/VDE 0413-16.
The protective conductor is used for measuring purposes only,
and is thus not always accessible. The protective conductor at
the test socket can be tested as follows:
➭
Connect the test instrument to a multiple outlet strip.
➭
Conduct a touch current measurement for permanently con-
nected DUTs (nothing may be connected to the test socket).
➭
Measure protective conductor resistance between the neighbor-
ing socket at the multiple outlet strip and the test socket.
➭
The measured value may not exceed 0.3
.
For technical reasons, insulation resistance between LN and PE
inside the test instrument is roughly 3 M
.
This must be taken into consideration during technical safety
inspections or, instead of the insulation resistance measurement,
the protective conductor current measurement must result in a
value of less than 3.5 mA (or less than 7 mA if the equivalent leak-
age current method is used).
There are also 4 accessible conductive parts on the test instru-
ment, at which the touch current measurement must result in a
value of less than 0.5 mA:
•
Connector for service plug (jack socket)
•
USB ports
•
Metallized start key
•
Protective conductor bar in the test socket
Note
In order to prevent damage to the test instrument, we
recommend avoiding the performance of measurements
at the USB ports.
20.2
Housing Maintenance
No special maintenance is required for the housing. Keep outside
surfaces clean. Use a slightly dampened cloth for cleaning.
Attention!
!
Avoid the use of cleansers, abrasives and solvents.
20.3
Test Instrument Self-Tests
Various self-tests can be executed with the rotary switch set to
SETUP 1/3 > System 2/2 >
Self-Test
:
–
The color display can be checked for the failure of individual
segments and for the loss of color components.
A test image is displayed from which errors can be detected.
–
The buzzer can be tested for 3 different frequencies. Whether
or not the buzzer is working can be determined from the
respective test tone.
–
The database can be checked for corrupt data. You’re provided
with feedback concerning the results of automatic testing.
–
The test socket can be checked for correct functioning. Con-
nect a test DUT to this end, for which you know whether or
not it has a protective earth terminal. The results are displayed
(plug (not) detected / protective conductor terminal) and must
coincide with the connected DUT.
20.4
Backup Battery for Real-Time Clock
The backup battery (lithium cell) should be replaced no later than
after 8 years. The battery can only be replaced by the service
department. See “Contact, Support and Service” on page 109.
If backup battery voltage is too low, the date and time assigned to
the test data no longer correspond to the actual time of recording.
This may also influence sorting in IZYTRONIQ software.
The instrument’s database itself isn’t affected by a depleted backup
battery.
20.5
Fuse Replacement
The test instrument is equipped with a fuse for probe input P1 for
the 10 A protective conductor test (only for test instruments with
feature H01, e.g. SECUTEST ST PRO) and two fuses for the
mains connection. These can be replaced when defective.
Required Materials
•
A slotted screwdriver for opening the fuse compartment
•
A replacement fuse which complies with the specifications in
the technical data or the labeling on the instrument (see sec-
tion 5.6 “Characteristic Values”)
➭
Switch the test instrument off and disconnect it from mains
power.
Attention!
!
The fuses may only be replaced when the test instru-
ment is voltage-free, i.e. it must be disconnected from
mains supply power and may not be connected to a
measuring circuit.
➭
Open the respective fuse compartment. Insert the slotted
screwdriver into the slot on the fuse compartment and turn it
counterclockwise.
➭
Pull out the fuse cover as soon as it protrudes slightly from the
housing.
➭
Remove the defective fuse from the fuse cover.
➭
Insert the new fuse into the fuse cover.
Attention!
!
Only use replacement fuses which comply with the
specifications in the technical data or the labeling on the
instrument (see section 5.6 “Characteristic Values”).
No other fuses may not be used in the test instrument.
➭
Insert the fuse cover with the fuse back into the fuse compart-
ment. The two tabs on the fuse cover must be inserted into
the recesses in the housing.
➭
Insert the slotted screwdriver into the slot on the fuse com-
partment and turn it clockwise until the fuse compartment is
closed.
20.6
Calibration
The test instrument must be calibrated at regular intervals. Refer
to section 20.6.1 for information concerning the calibration inter-
val.
Update the calibration and recalibration dates after each calibra-
tion in order to keep track of the intervals. See section 20.6.2.
20.6.1 Required Recalibration Interval
Use of your test instrument and resultant stressing influence the
instrument and lead to deviation from warranted accuracy values.
In the case of strict measuring accuracy requirements, as well as
in the event of severe stressing (e.g. severe climatic or mechanical
stress), we recommend a relatively short calibration interval of
once per year. If this is not the case, a calibration interval of 2 to 3
years is usually adequate.
Please contact GMC-I Service GmbH for calibration services. See
“Contact, Support and Service” on page 109.
Summary of Contents for SECULIFE ST BASE 25
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