5. METHOD OF MEASUREMENT
5-1. Preparation and Caution before taking Measurement
● A
void using the tester in places subj
ect to high temperatures, humidity or
excessive vibration.
●
Before measurements, be sure the data hold switch is set to "OFF
". (It is
impossibl
e to make measurements if the data hold switch is set to "ON"
.)
●
Remove the battery if the tester will not be used for
a long period of time.
△
!
WARNING
● T
o avoid electrical shock, exercise CAUTION when working with more than 60V
DC or 25V AC rms since the danger of electric shock may exist. In addition, check
that the test leads are normal condition.
● POSSIBLE ELECTRICAL SHOCK. Do not make measurements if the case is
damaged or the battery cover is removed. Remove all electrical inputs before
removing the battery cover.
● POSSIBLE ELECTRICAL SHOCK or FIRE HAZARD. Do not expose this tester to
rain or moisture. Do not operate the tester in the presence of flammable gases or
fumes.
● Do not exceed the maximum input limits.
● Never clamp the conductor of the circuit carrying 300V or greater.
● Never make measurements for uninsulated conductors or bus bars.
5-2. Method of Measurement
Important Note :
Model 600 employs the hall effects for the CT censor. The characteristics of the hall
effect have a hysteresis due to magnetization. It means the zero adjustment point is
varied in DC current measurement. To eliminate this effect, open and close the jaws
several times to discharge and always press zero adjustment switch before measure-
ments.
For reference, when DC 10A conductor is clamped, 100mA indication by magnetization
is observed in our test.
The high sensitive hall effect sensor is used in CT. When clamping the conductor, open
and close the jaws slowly and firmly to avoid the impact to the sensor.
‐5‐
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