13
Operating Precautions
Before performing an automatic measurement
CAUTION
To protect the relay contacts, switching the measurement terminals
with relays leaving a measurement voltage output requires a protective
resistor* inserted in series in the circuit.
Protective resistance value ≥ (Measurement voltage) / (Maximum allowable
current)
* Implements resistance to prevent the current owing through the contact from
exceeding the maximum allowable current of the contact
Before using the shielding box
WARNING
A maximum measurement voltage of 2000 V may be generated between the
GUARD terminal or the OUTPUT terminal and the GROUND terminal according to
a connecting manner of the shorting plug.
Be sure to connect the external case of the shielding box to the GROUND
terminal.
To prevent an electric shock, use the interlock function (p. 62).
In addition, take sucient precautions to avoid an electric shock.
Before removing the measured object
WARNING
If a high-voltage is used to measure resistance, because measurement voltage
may remain in the measured object even after the measurement has ended, there
is the risk of an electric shock if you try to immediately remove the object. Set the
time in Discharge 2 relatively longer and remove the measured object after the
dangerous voltage has been discharged.
Before controlling the instrument externally
Read the following precautions before also using the interlock function.
WARNING
To avoid electric shock or damage to the equipment, always observe the following
precautions when connecting to connectors:
• Be careful to avoid exceeding the ratings of connectors.
• During operation, a wire becoming dislocated and contacting another
conductive object can be serious hazard. Use screws to secure the RS-232C
connector, GP-IB connector, and EXT I/O terminal.
• Ensure that devices and systems to be connected to the RS-232C connector,
GP-IB connector, EXT I/O terminal, or INTER LOCK terminal are properly
isolated.
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