YOKOGAWA 320110, User Manual

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IM 3201–E
5. Maintenance
5.1 Adjustment
In case of the accuracy of the tester becomes doubtful as the
result that an excessive load of shock is applied to the tester,
the tester must be tested using other calibrated instrument. If the
accuracy is observed to be over the specified value, the tester
must be readjusted.
In case the resistor is burnt, it must be replaced according to the
circuit diagram and parts list (in Section 3.8), and further, the
sensitivity of the tester must be adjusted in the following manner.
(1) Set the polarity select switch to
+DC,AC, Ω
and the measuring
range select switch to the “DC 0.3 V” range.
Apply “DC 0.3 V” and turn the semifixed resistor VR
1
(as
indicated on the print board) so that the pointer may indicate the
full scale value correctly.
(2) Set the measuring range select switch to the “AC 120 V” range.
Apply “AC 120 V” and turn the semifixed resistor VR
2
so that the
pointer may indicate the full scale value correctly.
Above procedures make a complete adjustment on the DC, AC, and
Ωcircuits.
5.2 Fuse Replacement
CAUTION
There is a risk of electrical shock to persons.
· Prior to replacing the fuse, disconnect the instrument from the
circuit to be measured, if connected, to prevent an electrical
shock hazard.
· Do not operate the instrument when the case is left open.
· Use only the specified fuse.
In case the fuse has blown, remove the screw of the center of
the bottom case. Then, replace the blown fuse with a new one (of
specified rating) that is provided on the side surface of the case.
After Services
When the instrument does not operate properly and needs repair,
please contact Yokogawa or the store where you bought the
product.