Metrohm E1620, Инструкция по эксплуатации

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5. OPERATING INSTRUCTIONS
5.1 Preliminary Checks
(1) With the leads disconnected, select the 20m
Ω
range
and switch on the instrument by pressing the test switch
and holding it depressed.
(2) The low current warning lamp ‘I’ should light and the
LCD should indicate the overrange condition as shown
in Fig. 1.
Fig. 1
(3) If the warning lamp or the LCD display do not operate,
check that batteries have been correctly installed in the
instrument.
(4) On releasing the test switch, the reading should remain
on the LCD for about two minutes after which the
instrument will automatically switch off. Where
customer test leads are used, their connection to the
item to be tested should be as illustrated in Fig. 4.
to 10.40m
Ω
at 30ºC. Account should be taken of this effect in
making measurements.
When measuring the resistance of item, such as current shunts,
which have joints of dissimilar conductors, thermal EMFs can
affect the accuracy of the measurement. This condition can be
detected if the reading alters when the leads are reversed. To
compensate for this effect, the average of the two readings should
be taken as the true measurement.
5.7 Battery Replacement
If the ‘BAT’ symbol appears on the LCD during a test, testing
should be discontinued until the batteries are replaced or
recharged in the case of nickel–cadmium cells. Before accessing
the batteries, the test leads should be removed for safety reasons.
Access to the batteries is via the lid in the base of the instrument.
The two plastic screws should be loosened to allow the lid to be
removed. The discharged batteries can then be removed and
replaced with new or recharged batteries. The orientation of the
batteries should be as indicated by the polarity symbols in the
battery compartment. The lid can then be replaced and the plastic
screws tightened.
5.8 Fuse Replacement
Fuse protection is provided on the current terminals, C1 and
C2, and it is indicative of a blown fuse if the low current warning
lamp ‘I’ is lit and the resistance across terminals C1 and C2, is
less than 1
Ω
. The fuse is positioned in the battery terminal and
the same procedure, as was described in the previous section,
should be followed to access the fuse. The blown fuse should be
5. OPERATING INSTRUCTIONS
5.1 Preliminary Checks
(1) With the leads disconnected, select the 20m
Ω
range
and switch on the instrument by pressing the test switch
and holding it depressed.
(2) The low current warning lamp ‘I’ should light and the
LCD should indicate the overrange condition as shown
in Fig. 1.
Fig. 1
(3) If the warning lamp or the LCD display do not operate,
check that batteries have been correctly installed in the
instrument.
(4) On releasing the test switch, the reading should remain
on the LCD for about two minutes after which the
instrument will automatically switch off. Where
customer test leads are used, their connection to the
item to be tested should be as illustrated in Fig. 4.
to 10.40m
Ω
at 30ºC. Account should be taken of this effect in
making measurements.
When measuring the resistance of item, such as current shunts,
which have joints of dissimilar conductors, thermal EMFs can
affect the accuracy of the measurement. This condition can be
detected if the reading alters when the leads are reversed. To
compensate for this effect, the average of the two readings should
be taken as the true measurement.
5.7 Battery Replacement
If the ‘BAT’ symbol appears on the LCD during a test, testing
should be discontinued until the batteries are replaced or
recharged in the case of nickel–cadmium cells. Before accessing
the batteries, the test leads should be removed for safety reasons.
Access to the batteries is via the lid in the base of the instrument.
The two plastic screws should be loosened to allow the lid to be
removed. The discharged batteries can then be removed and
replaced with new or recharged batteries. The orientation of the
batteries should be as indicated by the polarity symbols in the
battery compartment. The lid can then be replaced and the plastic
screws tightened.
5.8 Fuse Replacement
Fuse protection is provided on the current terminals, C1 and
C2, and it is indicative of a blown fuse if the low current warning
lamp ‘I’ is lit and the resistance across terminals C1 and C2, is
less than 1
Ω
. The fuse is positioned in the battery terminal and
the same procedure, as was described in the previous section,
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