Hioki SM-8216, Инструкция по эксплуатации, Страница: 30 / 44

18
WARNING
The tip of the black measuring rod (to be connected to the Rx ‘+’
measuring terminal) should be connected to the ground of the sample
to be measured if one end of the sample is connected to the ground, or should be
connected to the exposed external partof the sample if either end of the sample is
not grounded. As the redmeasuring rod (to be connected to the Rx ‘
‑
‘ measuring
terminal) carries the measuring voltage, do not touch the part connected with
the red measuring rod.
CAUTION
A sample with a large capacitance keeps an electric charge even
after
the measurement, and if you touch it you will have an electricshock. To
avoid such a hazard, set the MEASURE/CHARGE/DISCHARGE function
selector to the DISCHARGE position, and touch the measuring rod to
the part of the sample to discharge the charge.
For detailed discharge
function, see 6.2 Using the MEASURE/ CHARGE/DISCHARGE Function
Selector.
Notes:
1) When the red measuring rod (connected to the Rx ‘
‑
‘ terminal) is
connected to the ground end of the grounded sample,
themeasurement can not be performed because of a
shortedmeasuring voltage.
2) The black measuring rod (connected to the Rx ‘
+
‘ terminal) is
connected to the chassis (ground) of the SM-8216 unit.
This design makes it possible, when measuring the insulation
resistance of a shielded wire sample between its conductor and
shielding braid where one end of the sample (shielding braid, in
this case) covers the other end (conductor), to connect the black
measuring rod to the outside end (shielding braid). This arrange
ment has two advantages; 1) minimizing the opportunity for the
operator to receive an electric shock, and 2) reducing the external
noise by shielding effect.
6. MEASUREMENT
6.1 Measuring Method
This describes a few measuring methods using the accessory measuring rods.