<2. Handling Cautions>
2-3
IM 01C27C01-01EN
2.6 Restrictions on Use of Radio
Transceivers
IMPORTANT
Although the transmitter has been designed to
resist high frequency electrical noise, if a radio
transceiver is used near the transmitter or its
external wiring, the transmitter may be affected
by high frequency noise pickup. To test this, start
out from a distance of several meters and slowly
approach the transmitter with the transceiver
while observing the measurement loop for noise
effects. Thereafter use the transceiver outside
the range where the noise effects were first
observed.
2.7 Insulation Resistance and
Dielectric Strength Test
Since the transmitter has undergone insulation
resistance and dielectric strength tests at the factory
before shipment, normally these tests are not
required. If the need arises to conduct these tests,
heed the following:
(a) Do not perform such tests more frequently than
is absolutely necessary. Even test voltages that
do not cause visible damage to the insulation
may degrade the insulation and reduce safety
margins.
(b) Never apply a voltage exceeding 500 V DC
(100 V DC with an internal lightning protector)
for the insulation resistance test, nor a voltage
exceeding 500 V AC (100 V AC with an internal
lightning protector) for the dielectric strength
test.
(c) The procedure for conducting these tests is as
follows:
• Insulation Resistance Test
1) Remove the battery pack. See subsection 9.4.5
for details on how to remove it.
2) Short-circuit the battery connection terminals in
the terminal box.
3) Turn OFF the insulation tester. Then connect
the insulation tester plus (+) lead wire to the
shorted battery connection terminals and the
minus (–) leadwire to the grounding terminal.
4) Turn ON the insulation tester power and
measure the insulation resistance. The voltage
should be applied as briefly as possible to verify
that the insulation resistance is at least 20 MΩ.
5) After completing the test and being very careful
not to touch exposed conductors disconnect the
insulation tester and connect a 100 kΩ resistor
between the grounding terminal and the short-
circuiting battery connection terminals. Leave
this resistor connected at least one second to
discharge any static potential. Do not touch the
terminals while it is discharging.
NOTE
When storing the instrument with a battery
pack, it is recommended to put the instrument in
Deep Sleep mode to conserve the batteries. For
details on how to switch to Deep Sleep mode,
refer to subsection 8.3.13 “Switching to Deep
Sleep Mode”.
• Dielectric Strength Test
1) Remove the battery pack. See subsection 9.4.5
for details on how to remove it.
2) Short-circuit the battery connection terminals in
the terminal box.
3) Turn OFF the dielectric strength tester. Then
connect the tester between the shorted battery
connection terminals and the grounding
terminal. Be sure to connect the grounding lead
of the dielectric strength tester to the ground
terminal.
4) Set the current limit on the dielectric strength
tester to 0.1 mA, then turn ON the power and
gradually increase the test voltage from ‘0’ to
the specified voltage.
5) When the specified voltage is reached, hold it
for one minute.
6) After completing this test, slowly decrease the
voltage to avoid any voltage surges.
NOTE
When storing the instrument with a battery
pack, it is recommended to put the instrument in
Deep Sleep mode to conserve the batteries. For
details on how to switch to Deep Sleep mode,
refer to subsection 8.3.13 “Switching to Deep
Sleep Mode”.
