Operating Precautions
9
Before Connecting EXT I/O
To avoid electric shock or damage to the equipment, always observe the following
precautions when connecting to the EXT I/O connector.
• Always turn off the power to the instrument and to any devices to be connected
before making connections.
• Be careful to avoid exceeding the ratings of external terminals (p. 91).
• During operation, a wire becoming dislocated and contacting another conductive
object can be serious hazard. Make sure that connections are secure and use
screws to secure the external connectors.
• Properly insulate any devices and mechanisms to be connected to the EXT I/O con-
nector.
• The ISO_5V pin of the EXT I/O connector is a 5V power output. Do not apply external
power to this pin.
Before Measuring
• Do not apply any voltage to the measurement jacks. Doing so could damage the instru-
ment.
• Never attempt to measure at a point where voltage is present. In particular, do not measure
a transformer or motor immediately after a temperature increase test or withstand-voltage
test, as the instrument could be damaged by induced voltage or residual charge.
• Battery internal resistance cannot be measured with this instrument. It will sustain damage.
To measure battery internal resistance, we recommend the HIOKI 3554, 3555, BT3562,
BT3563, and 3561 Battery HiTesters.
• To obtain the guaranteed measurement accuracy, allow at least 30 minutes warm-up.
• The instrument internally retains all settings (but not measured values), such as measure-
ment range and comparator settings. However, measurement settings made through the
RS-232C or GP-IB interface are not memorized.
• In the 100 and higher ranges (LOW POWER set to OFF), thermal emf can cause mea-
surement errors.
• The DC resistance of a power transformer cannot be measured. When measuring objects
with a large L, such as choke coils and other inductors, measured values may be unstable.
In such cases, contact your dealer or Hioki representative.
• Carefully insulate all H
CUR
, H
POT
, L
POT
, and L
CUR
wiring. Proper 4-terminal measurements
cannot be performed and an error will occur if core and shield wires touch.
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