Inspection Before Use
30
Check item
Action
No indicators are missing.
Display all indicators and ensure that
no indicators are missing. (p. 52)
If any of the indicators are missing,
send the instrument for repair.
Operation check
This section introduces some of the operation checks. Periodical
calibration is necessary in order to ensure that this instrument
operates according to its specifications.
1
Check that the test leads are not broken.
Check method
Action
Regarding the continuity check,
deliberately short circuit the test
leads and then check the display.
For the DT4221
(The position of the rotary switch
varies depending on the model.)
Normal:
A buzzer sounds and the value
stabilizes at around 0
Ω
.
Abnormal:
A buzzer does not sound and
a numeric value other than the
above appears.
Corrective action:
The test leads may be broken.
Replace with those specified by
our company.
If the same phenomena persist
even after the test leads are
replaced, a malfunction may have
occurred. Halt inspection and then
send the instrument for repair.
Содержание DT4221
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