Hioki 3332 - Page 26

12
────────────────────────────────────────────────────
2.1 Before Measurement
────────────────────────────────────────────────────
WARNING
When using an external voltage transformer, do not leave the
secondary side short-circuited. If a voltage is applied to the primary
while the secondary is short-circuited, a high current will flow
through the secondary, which could lead to fire or malfunction.
When using an external current transformer, do not leave the
secondary side open-circuit. If a current flows through the primary
while the secondary is open-circuit, this can generate a high voltage
on the secondary, which is extremely dangerous.
CAUTION
・ To avoid electric shock, the wiring which is used for making the
connections to the current input terminals should have sufficient
current carrying capacity and insulation.
・ This unit is designed for indoor use and can be safely used at
temperatures ranging from 0℃ to 40℃.
・ Do not store or use the unit where it will be exposed to direct sunlight,
high temperatures, high humidity, or condensation. If exposed to such
conditions, the unit may be damaged, the insulation may deteriorate,
and the unit may no longer satisfy its specifications.
・ This unit is not constructed to be waterproof or dustproof, so do not
use it in a very dusty environment or in one where it will get wet.
・ Do not use the unit near any device which generates strong
electromagnetic radiation or near a static electrical charge, as these
may cause errors.
・ To prevent electric shock, do not allow the unit to become wet and do
not use the unit when your hands are wet.
NOTE
･ This unit is designed only for AC measurements. Significant DC components
(such as full-wave rectifier output) cannot be measured.
･ Because the polarity of the voltage and current will affect electrical
measurement, be sure the wiring is connected correctly.
･ If the voltage and current of the device being measured exceeds the
measurement range of this unit, please use an outside-connected PT, or CT.
The measurement value can be directly read if the scaling function is used.
･ When using an outside connected trans (PT, CT), the phase differences of
those may cause differences in the electrical measurement. If a precise
electrical measurement is necessary, use a PT or CT that has only a small
phase difference from the wiring's wave length area that is to be used.
･ Make sure that the wiring of the electric wires are separated from this unit,
so that there is no effect on this unit from an outside magnetic field.
･ If the measured line is active when the 3332 is tuned on, the 3332 may
malfunction or Err105 may be displayed. Thus, turn on the 3332 first and
check that Err105 is not displayed, and then turn on the measured line.